Kinda strange.

[rhipsher]

These would be flattering comments from my local ZR-1 freinds if it made sense to me. I've got 5 Z buddies in town.SanjayWill BarrettLT5LeeUSAFpilotand ROB93ZR1 on CF.I'll exclude Sanjay and Will Barrett because their Z's are nowhere near stockanymore.But 3 out of the latter hang out on a regular basis and two of which have not only been a passenger in my car but have driven it. And all three have made the same comment "Dude! Your car pulls harder than mine". Same thing happened last monday when Rob and I went to drop his car off at Coreys. We leave Corey's and head to Macarroni grill. And as I'm on the on ramp to the freeway Rob says Ok man put the hammer down. I want to see what your car has. I do. And he says the same thing. Your car pulls harder than mine and he says and thats with his big 300lb fat azz in the passengers seat. I told him I don't know how thats possible. He's got the 405hp LT5 with a B&B exhaust Haibak chip and 4:10 viper gears. His car dynoed at 368rwhp. He says I don't care what I've got your car accelerates faster than mine. And of course he points out the fact that I put that Fidanza on and I've ported my top end which makes a difference. But before I ever ported the top end USAFpilot and LT5Lee said the same thing. I know for a fact I'm running stock 3.45 rear gears. And I know that no engine work has been done to it so I don't know? Maybe it's just really good running Z. I don't know what else it could be. I decided to wait and get it dynoed after I put the headers/bullet cats on and have it tuned. Then I'll see what kinda hp #'s it's really putting out.

[GOLDCYLON]

Maybe his secondary actuators are installed backwards

[rhipsher]

Then that would mean all three of their secondaries are installed backwards. It's possible but I highly doubt it. And since Robs car already dynoed 368rwhp I would think it's safe to say his secondaries are functioning just fine.

[GOLDCYLON]

I disagree. They will still function if installed backwards but the throttle response will be slower than if they are installed the right way. Just a thought since the information provided was that you seem to have the "jump" on your friends when you punch it.

This was a reported problem many years ago and reported in the older registry maginzines. A lot of them were reinstalled backwards probably by GM dealers after a maintence procedure. A lot of members noticied an immediate improvement in Throttle response when returned the correct way. Just another area to check. GC

[rhipsher]

Well I will be able to determine that soon enough since I'll be doing a complete tear down/top end porting and re assembly on his 93 Z in trade for a brand new set of CCW rims. 13"wide rears and 11" fronts. They are some sweet looking rims.
But I digress. What are the odds that three different year Z's 91 93 94 would have their secondary actuators installed with the actuator arms 180 from where they are supposed to be?

[xlr8nflorida]

Well I will be able to determine that soon enough since I'll be doing a complete tear down/top end porting and re assembly on his 93 Z in trade for a brand new set of CCW rims. 13"wide rears and 11" fronts. They are some sweet looking rims.
But I digress. What are the odds that three different year Z's 91 93 94 would have their secondary actuators installed with the actuator arms 180 from where they are supposed to be?

I think its a combination of things. You may have a real stout LT-5 and perhaps they have a few issues with their cars or perhaps they are just pulling your leg :mrgreen:

Just be glad its a strong one :worship:

[rhipsher]

You may be right. I guess it will just have to remain a mystery. If your gonna have a mystery, I suppose thats a good one to have.:mrgreen:

[Jeffvette]

Also everything feels faster from the passenger seat.

[rhipsher]

Also everything feels faster from the passenger seat.Not if my wife drives. She could make the fastest car in the world feel like a dog. Shifting at to low of RPM's and bogging it down until it just about stalls.
But I would agree with you about feeling faster from a passengers point of view accept for the fact both of them drove it. I don't ask to drive others Z's because I know how anal some can be about it so I don't have seat time behind the wheel of numerous other Z's to compare it to. So if thats what they say then Ok. I was just wondering if there might be a reason that would cause there to be a slight difference in performance. No big deal or anything.

[flyin ryan]

Also everything feels faster from the passenger seat.True story...:dontknow:

[USAFPILOT]

my actuators are in fact on backwards...I was told that it probably left the factory that way and that after 44000 Miles I shouldn't switch them. I am going to install my new injectors when I get back from vegas, maybe I will turn them around. I still dynod 356 rwhp with it the way it is, but ricks car does feel like it has more punch at least initially. A faster throttle response makes sense to me. I,m hoping my injectors will fix my idle problems and get my hp back up into the 360's,maybe reversing the actuators will help some.

[Dynomite]

my actuators are in fact on backwards...I was told that it probably left the factory that way and that after 44000 Miles I shouldn't switch them.

I have been watching this thread and it just occurs to me you are talking the vacuum actuators for the secondaries as pictured here? If so....the shafts on mine were 180 deg off and I just rotated both vacuum canisters 180 deg a couple days ago :thumbsup:

The shafts now are going straight back from the canister rather than at an angle and look a lot better than they did before :cheers:

If this is what GOLDCYLON is talking about, he definitely has a point worth considering (actually he is always on point) and yes if both USAFPILOT and myself have the same vacuum actuator issue....well :sign10:

http://i287.photobucket.com/albums/ll142/dynomite007/ZR1/Solenoid-1.jpg

[Paul Workman]

...Ya could pull ALLA that crap and cure about 100% of your vacuum secondary headaches...forever! ;) Talk about a snappy throttle response!:dancing

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/ZR-1009.jpg

But, on a more serious side, assuming the mechanical dimensions are close, then it is things like cam timing, spark timing, fuel/air ratio, plug condition, etc, etc. etc. that makes up the tune; aside from passenger perceptions, It could be one of those things. How do they compare on the dyno (is a better question)?

P.

[Dynomite]

...Ya could pull ALLA that crap and cure about 100% of your vacuum secondary headaches...forever! ;) Talk about a snappy throttle response!:dancing

But, on a more serious side, assuming the mechanical dimensions are close, then it is things like cam timing, spark timing, fuel/air ratio, plug condition, etc, etc. etc. that makes up the tune; aside from passenger perceptions, It could be one of those things. How do they compare on the dyno (is a better question)?

P.

I am close to eliminating the secondaries but my secondary crap looked in great condition and and....and.....I am still thinking :icon_stud

I did eliminate all my air induction system when I installed SW headers :sign10:

I am timing the cam shafts using my own method :drunken_s http://www.zr1netregistry.com/forum/showthread.php?t=10750&page=2

I have installed new spark plugs, new coils, new plug wires....and I am hoping for a great passenger perception :sign10:

[GOLDCYLON]

I have been watching this thread and it just occurs to me you are talking the vacuum actuators for the secondaries as pictured here? If so....the shafts on mine were 180 deg off and I just rotated both vacuum canisters 180 deg a couple days ago :thumbsup:

The shafts now are going straight back from the canister rather than at an angle and look a lot better than they did before :cheers:

If this is what GOLDCYLON is talking about, he definitely has a point worth considering (actually he is always on point) and yes if both USAFPILOT and myself have the same vacuum actuator issue....well :sign10:

http://i287.photobucket.com/albums/ll142/dynomite007/Solenoid.jpg

Yep thats what I talking about ! I realize the ODDs in reguards to the OPs original post however it still remains a possibility. Especially since two other members have noticed the same issue.

[32valvZ]

my actuators are in fact on backwards...I was told that it probably left the factory that way and that after 44000 Miles I shouldn't switch them. I am going to install my new injectors when I get back from vegas, maybe I will turn them around. I still dynod 356 rwhp with it the way it is, but ricks car does feel like it has more punch at least initially. A faster throttle response makes sense to me. I,m hoping my injectors will fix my idle problems and get my hp back up into the 360's,maybe reversing the actuators will help some.

I would just buy new ones. If you turn them around now you will more than likely have future trouble. The rubber diaphragm has now taken a shape from heat cycling and being installed as it has. When you flip them around the brittle rubber is forced into a new position and will eventually crack. Think of a wire hanger when you bend it back and forth quickly to break it in half, same concept.

If you do get new ones, check them with a vacuum gauge and make sure they pull in straight & evenly. I went through 11 cans before finding 2 that were perfect.

When I reassembled the secondary system, I put a dab of white assembly lube on every moving pivot point. My secondaries work flawlessly and without any lag time.

[Dynomite]

Yep thats what I talking about ! I realize the ODDs in reguards to the OPs original post however it still remains a possibility. Especially since two other members have noticed the same issue.

I might be mistaken here but can you look down through the plenum and actually see if you have this problem without removing anything :happy1:

[Dynomite]

I would just buy new ones. If you turn them around now you will more than likely have future trouble. The rubber diaphragm has now taken a shape from heat cycling and being installed as it has. When you flip them around the brittle rubber is forced into a new position and will eventually crack. Think of a wire hanger when you bend it back and forth quickly to break it in half, same concept.

If you do get new ones, check them with a vacuum gauge and make sure they pull in straight & evenly. I went through 11 cans before finding 2 that were perfect.

When I reassembled the secondary system, I put a dab of white assembly lube on every moving pivot point. My secondaries work flawlessly and without any lag time.

Where do you get new vacuum canisters? I see a couple on Ebay for $89 each. Are they that expensive? I shall dab white greese mine today :thumbsup:

[tomtom72]

I would have to say that I agree with Jeff and Ryan about the passenger seat thing. I think that as a passenger you are not occupied by driving the car and have nothing else to pay attention to except the sensation of speed? The only other thing that I can think of is that it's your car, and after awhile you get used to it? I know when i first got mine I thought "jez this thing is quick!" And now five yrs down the road I think, "hummmm, this seems to be losing it's edge?" Okay, okay, no wise cracks about "it's the wrench that's working on the car!":sign10:

I know I get the same feeling when I ride shot gun in Lou's Z. His car feels quicker/faster than mine and they're both 90's...although his motor was rebuilt and I'm sure that his cams are timed exactly where Lotus intended them to be. Could just having the cams timed to the correct factory specs make that much of a difference on a bone stock motor? I tell Lou all the time it's the cams being timed correctly vs my "iffy" OE cam timing is why I tell him his is quicker.:icon_scra

[GOLDCYLON]

I might be mistaken here but can you look down through the plenum and actually see if you have this problem without removing anything :happy1:

Again correct ! :thumbsup:

Also I will not suggest reusing the same Vacuum secondary actuator I would try to replace it unless I was in a pinch. Yes they are expensive little buggers and they have a high fail rate out of the box. When you test them if they pull to one side vs. straight they are toast. A little hand pump (Calm yourselves) can determine that real quick.

[rhipsher]

You can also just stick the stem in your mouth and "SUCK ON IT BABY" and achieve the same thing.

[GOLDCYLON]

You can also just stick the stem in your mouth and "SUCK ON IT BABY" and achieve the same thing.

I didnt enjoy the white silicone powder inside. Ask me how I know about that one? Jeffvette made me do it. :sign10:

[rhipsher]

I didnt enjoy the white silicone powder inside. Ask me how I know about that one? Jeffvette made me do it. :sign10:

I'll bet you felt violated. Nothing worse than a forced BJ. Hehehe!

[jonszr1]

rick , i think your light flywheel is the reason your car feels different . i have one in my 90 and when you stab her from a roll,poof she is gone .the 92 has the stk unit still in her and feels much slow, but actually she isnt . just my 2 cents

[rhipsher]

rick , i think your light flywheel is the reason your car feels different . i have one in my 90 and when you stab her from a roll,poof she is gone .the 92 has the stk unit still in her and feels much slow, but actually she isnt . just my 2 cents

I didn't think it felt slow. 395rwhp plus 3.92 gears headers/corsa. That thing was a neck snapper. It was a thrill to drive. Mine doesn't hold a candle to that one. And your black 90 is putting out somewhere in the 429rwhp range I think and with 4:10 gears. Pete's car is the fastest 350cu Z I've seen so far but yours are the 2nd fastest I've seen and driven. I've watched both you guys videos. There all over the net. I love watching them.

[petefias]

Again correct ! :thumbsup:

Also I will not suggest reusing the same Vacuum secondary actuator I would try to replace it unless I was in a pinch. Yes they are expensive little buggers and they have a high fail rate out of the box. When you test them if they pull to one side vs. straight they are toast. A little hand pump (Calm yourselves) can determine that real quick.

GOLDCYLON is spot on. With a little vacuum gage/pump you can actually measure and see how well and SMOOTHLY the secondaries open. Often times they just stick a little that affects how fast they open. Unfortunately, you probably need to pull the plenum to hook it up. The vacuum pump is also an essential tool to identify and isolate any kind of small vacuum leak in the system.

Pete

[rhipsher]

GOLDCYLON is spot on. With a little vacuum gage/pump you can actually measure and see how well and SMOOTHLY the secondaries open. Often times they just stick a little that affects how fast they open. Unfortunately, you probably need to pull the plenum to hook it up. The vacuum pump is also an essential tool to identify and isolate any kind of small vacuum leak in the system.

Pete

You have to pull te plenum to check them. There's no other way. But pulling the plenum is no biggy.

[32valvZ]

Where do you get new vacuum canisters? I see a couple on Ebay for $89 each. Are they that expensive? I shall dab white greese mine today :thumbsup:

Tom Henry Chevrolet. Tell them youre a ZR1 Registry member and you should be able to do better than $89.
:cheers:

*edit* in my original post I said "vacuum gauge" I meant vacuum pump. My Mighty-Vac has a gauge on it and I was thinking of that.**

[A26B]

Mine were installed backwards? (some controversy about that even). With the plenum off, I checked operation with a hand vacuum pump before turning the actuators over, and afterwards. There was a significant difference in operation after I put the actuators on "correctly". It took more vacuum & hung a little before opening completely, with the actuators installed "correctly". It was a no brainer, I returned them to the backwards? position.

I've not heard of any operational problems with actuators installed backwards?, other than it "just looks crooked."

[Dynomite]

Now what :sign10:

I am going to hot wire my spare vacuum pump and then hook up the secondary vacuum lines (I have an extra roll of vacuum line) and see what they do :drunken_s

Besides that...I just ran my cell phone through the wash machine for five minutes......:rolleyes:

If anyone is reading this....how does that black plastic under the radiator fit in place....I forgot that also.....da....this is one of those days :occasion1

[GOLDCYLON]

Mine were installed backwards? (some controversy about that even). With the plenum off, I checked operation with a hand vacuum pump before turning the actuators over, and afterwards. There was a significant difference in operation after I put the actuators on "correctly". It took more vacuum & hung a little before opening completely, with the actuators installed "correctly". It was a no brainer, I returned them to the backwards? position.

I've not heard of any operational problems with actuators installed backwards?, other than it "just looks crooked."

I hear what your saying Jerry. Im betting if you had a fresh set and installed them correctly the result would be different. When they were installed backwards the diaphram was tweaked already the other way. I would not recommend turning them unless you had replacements even if they were installed backwards.

[USAFPILOT]

where do you get and how much are the replacements?

[GOLDCYLON]

Last pair I got was from a registry member. One off of Ebay

[rhipsher]

I bought two on ebay for $50. They came off an 18K Z. I gave one away to a reg member who needed one and the other one is rolling around in one of the kitchen drawers. I'll keep that one for myself. I'll probably need it one day.

[Dynomite]

I hear what your saying Jerry. Im betting if you had a fresh set and installed them correctly the result would be different. When they were installed backwards the diaphram was tweaked already the other way. I would not recommend turning them unless you had replacements even if they were installed backwards.

I will hot wire my spare vacuum pump and test the secondary actuators like I said just before I washed my cell phone :sign10:

There is a black plastic sheet about 24 inches x 8 inches that sits under the radiator....which way does that fit :icon_ques

There are two slots in it about 3 inches from each end.

Not like I am highjacking this thread or anything :sign10:

I will go out now and test my secondary actuators for ya ;)

[32valvZ]

Are my posts invisible? :dontknow:

[rhipsher]

Dynamite! Are you legally blonde?:mrgreen:

[rhipsher]

Are my posts invisible? :dontknow:No we are just ignoring you.:mrgreen:

[Dynomite]

I would just buy new ones. If you turn them around now you will more than likely have future trouble. The rubber diaphragm has now taken a shape from heat cycling and being installed as it has. When you flip them around the brittle rubber is forced into a new position and will eventually crack. Think of a wire hanger when you bend it back and forth quickly to break it in half, same concept.

If you do get new ones, check them with a vacuum gauge and make sure they pull in straight & evenly. I went through 11 cans before finding 2 that were perfect.

When I reassembled the secondary system, I put a dab of white assembly lube on every moving pivot point. My secondaries work flawlessly and without any lag time.

You are DAMAN :thumbsup:
I am NOT ignoring you....this darn system is so slow tonight I can hardly stand it :sign10: I just had a bad day :happy1:

What you say as a solution I am doing all of that. I just got back from experimenting exactly as you suggested (after spending the last couple hours trying to dry out my cell phone) hot wiring a spare vacuum pump I have and using a long spare roll of vacuum line connected to each secondary.

Do you want to hear how the ole experiment went :sign10:

Well....The actuators were first installed correctly for the experiment (they were backward before) with the short leg of the shaft "L" facing toward center of engine......(the short leg of the "L" was facing outward before and incorrectly causing the actuator shaft to be angled toward the outside of the engine toward the actuator)......

When I applied a vacuum to either actuator, the first motion of the "L" was toward the center of the engine a bit (toward the direction of the short leg of the "L"). Both actuators moved from that point smoothly pulling the secondary.

Now.....32valveZ if I rotate both actuators back the "wrong way" like they were.....with the short leg of the shaft "L" facing outward and with the resulting greater angle of the shaft........the first motion was outward in the direction of the short leg of the "L" tending to make the angle of the shaft less and that side motion was greater than it was when they were installed correctly with the starting angle of the actuator shaft less.

So....what you are saying 32valveZ is that since these actuator shafts started with a greater side motion when installed incorrectly there is prolly much greater fatigue of the rubber which is suppose to hold the vacuum.

And now if one were to keep those secondary actuators (installed now correctly) the motion of the actuator shaft has now changed considerably and as such would not be reliable especially given the work to replace them involves removal of the plenum and other crapola :worship::worship:

[Dynomite]

Dynamite! Are you legally blonde?:mrgreen:


very funny rhipsher ;).....I am just being honest......stupidly honest

I thought I was at the place here where I can ask stupid questions :D

Damn cell phone in the washing machine made me feel like I should apply for some of those Obama social programs where the $%&*#$&% you are the more money you get :cheers:

When anyone uses the sign :iamwithstresponding to my posts...they really mean it :sign10:

[rhipsher]

You are DAMAN :thumbsup:
I am NOT ignoring you....this darn system is so slow tonight I can hardly stand it :sign10: I just had a bad day :happy1:

What you say as a solution I am doing all of that. I just got back from experimenting exactly as you suggested (after spending the last couple hours trying to dry out my cell phone) hot wiring a spare vacuum pump I have and using a long spare roll of vacuum line connected to each secondary.

Do you want to hear how the ole experiment went :sign10:

Well....The actuators were first installed correctly for the experiment (they were backward before) with the short leg of the shaft "L" facing toward center of engine......(the short leg of the "L" was facing outward before and incorrectly causing the actuator shaft to be angled toward the outside of the engine toward the actuator)......

When I applied a vacuum to either actuator, the first motion of the "L" was toward the center of the engine a bit (toward the direction of the short leg of the "L"). Both actuators moved from that point smoothly pulling the secondary.

Now.....32valveZ if I rotate both actuators back the "wrong way" like they were.....with the short leg of the shaft "L" facing outward and with the resulting greater angle of the shaft........the first motion was outward in the direction of the short leg of the "L" tending to make the angle of the shaft less and that side motion was greater than it was when they were installed correctly with the starting angle of the actuator shaft less.

So....what you are saying 32valveZ is that since these actuator shafts started with a greater side motion when installed incorrectly there is prolly much greater fatigue of the rubber which is suppose to hold the vacuum.

And now if one were to keep those secondary actuators (installed now correctly) the motion of the actuator shaft has now changed considerably and as such would not be reliable especially given the work to replace them involves removal of the plenum and other crapola :worship::worship:

Ah! Now what was you question again.

[Dynomite]

Ah! Now what was you question again.

My question is.....how do you dry out a cell phone that has been through the wash cycle :sign10:

[rhipsher]

My question is.....how do you dry out a cell phone that has been through the wash cycle :sign10:I'm sorry man. I've
had a few to many glasses on red wine tonight. Being silly. I think the cell phone is toast. You outta see how many times it will skip on the water. If it's a razor it should skip nicely.

[Dynomite]

I'm sorry man. I've
had a few to many glasses on red wine tonight. Being silly. I think the cell phone is toast. You outta see how many times it will skip on the water. If it's a razor it should skip nicely.

Darn...I should be drinking red wine myself :sign10:

The cell phone is coming alive....I used a heat gun and it is a bit foggy but my wife suggested I let it sit for a couple days and it might be fine :thumbsup:

This is the second time I did this :iamwithst meaning myself :sign10:

[carter200]

Darn...This is the second time I did this :iamwithst meaning myself :sign10:

Remember to check the pockets before throwing in the machine :thumbsup:

[Dynomite]

I went through 11 cans before finding 2 that were perfect.



Really...you went through 11 cans (secondary actuators)? Were they new old stock? I am assuming then that because they possibly were new (old stock) and the fact they have been shelved so long affected there quality?

Or are you saying the secondary actuators had poor quality control in the beginning. Right up there with the quality control of the original installation :D

[Jeffvette]

Really...you went through 11 cans (secondary actuators)? Were they new old stock? I am assuming then that because they possibly were new (old stock) and the fact they have been shelved so long affected there quality?

Or are you saying the secondary actuators had poor quality control in the beginning. Right up there with the quality control of the original installation :D


Nope, they are just bad out of the box. I went through the same issue about 6 years ago.

[GOLDCYLON]

Nope, they are just bad out of the box. I went through the same issue about 6 years ago.


WURD ! :hello:

[rhipsher]

Word to yo mother.
http://i301.photobucket.com/albums/nn63/keeno1970/vanilla-ice1.jpg
:cool:

[32valvZ]

:sign10: I had a good laugh from all the posting! Dynomite, it seems you have a firm grip on the vacuum can issues now! :mrgreen:

I'm by no means any kind of expert on the LT5, but I had my "fun" with this issue already! If I can save someone a little headache from my misfortunes, then cool! The issue with the cans for me was not so much the diaphragm not holding vacuum, (which 3 did not), but also the actuator arms weren't pulling in straight when vacuum was applied.
:cheers:

Dynomite, did you call Tom Henry Chevy yet? I think I was able to get my cans for around $70./ea if memory serves me.

[tccrab]

The cell phone is coming alive....I used a heat gun and it is a bit foggy but my wife suggested I let it sit for a couple days and it might be fine :thumbsup:


Put the cell phone in a quart sized ziplock bag and fill it with rice.
Zip it up and let it set for a couple of days.
Viola! Water gone.

Don't ask how I know this trick.
:redface:

TomC
'Crabs

[Dynomite]

:sign10: I had a good laugh from all the posting! Dynomite, it seems you have a firm grip on the vacuum can issues now! :mrgreen:

I'm by no means any kind of expert on the LT5, but I had my "fun" with this issue already! If I can save someone a little headache from my misfortunes, then cool! The issue with the cans for me was not so much the diaphragm not holding vacuum, (which 3 did not), but also the actuator arms weren't pulling in straight when vacuum was applied.
:cheers:

Dynomite, did you call Tom Henry Chevy yet? I think I was able to get my cans for around $70./ea if memory serves me.

I will call Tom Henry now :thumbsup:...as I was waiting....trying to figure out if I should order 11 cans or just two :sign10:

I have engine parts all over the garage at the moment and am trying to figure out how my Ron Davis radiator fits (I acutally forgot how to place that plastic on the bottom of the radiator....it is about 24 inches wide and 8 inches front of car to rear...it fits under radiator somehow as I recall) :happy1:

I am now considering installing a drain plug in the differential case.

[Dynomite]

Put the cell phone in a quart sized ziplock bag and fill it with rice.
Zip it up and let it set for a couple of days.
Viola! Water gone.

Don't ask how I know this trick.
:redface:

TomC
'Crabs

Done deal...thanks...:cheers:
I would have never thought of that.......that is like putting credit card in ziplock bag and sliding it through card reader if it does not work :sign10:

[Jagdpanzer]

Mine were installed backwards? (some controversy about that even). With the plenum off, I checked operation with a hand vacuum pump before turning the actuators over, and afterwards. There was a significant difference in operation after I put the actuators on "correctly". It took more vacuum & hung a little before opening completely, with the actuators installed "correctly". It was a no brainer, I returned them to the backwards? position.

I've not heard of any operational problems with actuators installed backwards?, other than it "just looks crooked."

I had the same experience with a set of out of the box NOS heads I recently picked up. After taking a close look its clear to me the actuators were intentionally installed this way at Mercury Marine in order to achieve a smother action with less vacuum. When installed the other way I could definitely observe the actuator binding internally in the last half of the stroke. In my case I had to apply more than twice the vacuum to fully open the secondarys.

[rhipsher]

When I put my top end all back together it just made sense to me to install them in a way that the arms would pull back as striaght as possible weather it was right or wrong.
http://i301.photobucket.com/albums/nn63/keeno1970/60.jpg

[USAFPILOT]

my brother got so waisted one night he awoke to find his blackberry in a glass full of beer. Long story short he washed it and dried it using the bag of rice and it came back to life no problem. But I advised him to not let it power up until after it was dry for a few days. I did the same thing with an RC car when I was a kid and had success.

[jrd1990zr1]

I would just buy new ones. If you turn them around now you will more than likely have future trouble. The rubber diaphragm has now taken a shape from heat cycling and being installed as it has. When you flip them around the brittle rubber is forced into a new position and will eventually crack. Think of a wire hanger when you bend it back and forth quickly to break it in half, same concept.

If you do get new ones, check them with a vacuum gauge and make sure they pull in straight & evenly. I went through 11 cans before finding 2 that were perfect.

When I reassembled the secondary system, I put a dab of white assembly lube on every moving pivot point. My secondaries work flawlessly and without any lag time.

I've got to ask. Where were you able to purchase the actuators that would let you test them first? Does any one know what the registry price is at Tom Henry Chevrolet?

Thanks, John :cheers:

[32valvZ]

I've got to ask. Where were you able to purchase the actuators that would let you test them first? Does any one know what the registry price is at Tom Henry Chevrolet?

Thanks, John :cheers:


Tom Henry Chevrolet

I paid for 2, but the guys at TH Chevy were good enough to send me 4 to check out. Then I just sent back any that were bad. We did this 3 times until I got 2 good units.