Siamese Intake Sealing Woes - Page 2 - ZR-1 Net Registry Forums

LGAFF · 10-15-2017

I used two gaskets to seal the semi-Siamese intake I had with very little surface area.....is the coolant blocked off?

LGAFF · 10-15-2017

Not much sealing surface and no issues....Gorilla glue is pretty brutal stuff, I used it to bond boards in my back hatch for my nitrous tank install...that stuff will not come off easy

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Jagdpanzer · 10-15-2017

Gasgacinch will do the job. Been using it for many years. Nothing else compares.
http://gasgacinch.com/home/technical/

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QB93Z · 10-15-2017

Quote:

Originally Posted by Rumblin70SS396

Hi Marty,

I will try blocking the air horn, haven't tried that yet.

Never tried the propane trick but I can do that as well.

I am located in Newark Delaware.

Tony

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If you are willing to drive about 1.5 hours to Westminster, MD I will set up a WAZOO Maintenance Day and we can try to help you get the Z running right. There are a lot of talented ZR-1 owners in the Washington/Baltimore area.

Jim
443-244-1347

RussMcB · 10-15-2017

I can't help with your problem (as much as Jerry and others), but I did want to pop in a say your engine looks great.

rkreigh · 10-19-2017

wazoo to the rescue! with the degree of mods on the mono runner it's not unusual to see them warped a bit

demps showed me a stock intake that was warped enough to not seal and with the amount of cutting and welding on the mono runner they can certainly warp

looks like a great intake!

rkreigh · 10-19-2017

Quote:

Originally Posted by Rumblin70SS396

Hello all,

It's been awhile since I have posted here. Unfortunately I have very little time to work on the car so it has been sitting. Any help is appreciated to get this Z up and running again.

A few years ago we replaced the coils, fuel pump, spider and all 16 injectors in this car. The original gaskets had a silicone sealer around each port and the water jackets. I used the paper gaskets available from one of the sponsors here without sealer. Unfortunately almost immediately it was leaking coolant and had a very high idle. After that I shut it down, tucked it in the corner and just got back to it here recently.

Fast forward to present day, I took another set of gaskets and used a non hardening Permatex gasket sealer I have used successfully on other cars. I put the intake back on and torqued the bolts in 20ft lb in the proper sequence. Once the car started, the water issue is gone but the high idle (2k) is still there. I can only assume it's a vacuum leak on the intake as the car never had these issues previously.

What's the best way to seal a siamese intake? Is there something else I am missing? Thanks in advance for any help.

Tony

Tony,

one other think you may want to consider is elminating the secondaries. It gets rid of the complicated vacuum system under the plenum and helps performance to boot.

I also do a "smoke test" to find vacuum leaks. take off the flex duct and tape up the inlet. find a vaccum port and blow smoke into the engine.

keep a sharp eye out and "smoke signals" will lead you to the vacuum leak

I saw and old mechanic do this and it's pretty cool.

DRM500RUBYZR-1 · 10-19-2017

I bought a good smoke machine for our shop a couple of years ago.
It is THE way to locate Evap or Vacuum leaks!
Working on the older Vettes with Vacuum headlight and wiper door systems made having one a must.
"Smoke Signals" sometimes abound. You find one big leak, then once fixed, many smaller leaks. We had a 69 that looked like the entire engine compartment and interior were on fire!
When you see smoke pouring out from under the plenum on the LT-5, you know what's next.
Back to the OP.
It will help to know which runner(s) are leaking, as you then can concentrate your efforts to that area of the plenum. Smoke, or the more dangerous but useful propane method will help to isolate exactly where your leak is coming from.
I would not pass up the offer from Jim, QB93Z, as he has done and supervised more plenum pulls than most other mortals!
Good luck and keep us posted!
Marty

USAFPILOT · 10-20-2017

Obviously the intake is trash. Send it to me, I will dispose of it properly for you.

Rumblin70SS396 · 10-24-2017

Guys

Thanks for all the suggestions. I apologize for taking a bit to get back to you but I was in Las Vegas for a conference. I was lucky enough to get BJ on Thursday and saw some of the Z's for sale.

I originally used this sealant with my gasket on both sides.

https://www.permatex.com/products/ga...llac-compound/

After your suggestions, it looks like gasgacinch or the gorilla glue might be better alternatives.

LGAFF,

The coolant is not blocked off. That was a big issue the first time as coolant leaked out. I like your idea of the two gaskets though.

QB93Z/Jim,

Thank you so much for the offer of taking a look at this car in an attempt to get it right. Currently I don't have a trailer and it can't be driven this way. I believe for now I will try some suggestions first and if I can't fix it, we will work something out.

RussMcB,

Thank you! It's really a cool car [emoji41]

rkreigh,

Thanks for the suggestions including the eliminating of the secondaries and smoke machine. I have heard time and time again about the secondaries. I would like to see the impact of the current changes before o go that route though as it requires a retune from what understand and this car has its share of modifications.

DRM500RUBYZR-1,

Again another vote for the smoke machine.....would something like this be sufficient?

https://www.amazon.com/dp/B0746SL9D6?psc=1

Seems like I could use this over and over for this and a bunch of cars including my C3.

USAFPILOT,

I agree, the intake is in the mail [emoji41]

So here's my thinking guys:

Retighten the intake and see if it eliminates the issue.

Buy smoke machine above to see if I can determine leak.

Reseal with double gaskets and gasgacinch or gorilla glue and retest.

If all else fails set up a maintenance day with QB93Z/Jim

Thank you all so much for your help......I'd really like to drive it again.

PS I apologize if I missed anything as I am doing this from my phone and don't know how to use multiple quotes.

Tony

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10-15-2017	#11
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,193	Re: Siamese Intake Sealing Woes I used two gaskets to seal the semi-Siamese intake I had with very little surface area.....is the coolant blocked off? __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

10-15-2017	#12
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,193	Re: Siamese Intake Sealing Woes Not much sealing surface and no issues....Gorilla glue is pretty brutal stuff, I used it to bond boards in my back hatch for my nitrous tank install...that stuff will not come off easy Sent from my iPhone using ZR-1 Net Registry __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 10-15-2017 at 10:41 AM.

10-15-2017	#13
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,658	Re: Siamese Intake Sealing Woes Gasgacinch will do the job. Been using it for many years. Nothing else compares. http://gasgacinch.com/home/technical/ Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

10-15-2017	#15
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: Siamese Intake Sealing Woes I can't help with your problem (as much as Jerry and others), but I did want to pop in a say your engine looks great.

10-19-2017	#16
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: Siamese Intake Sealing Woes wazoo to the rescue! with the degree of mods on the mono runner it's not unusual to see them warped a bit demps showed me a stock intake that was warped enough to not seal and with the amount of cutting and welding on the mono runner they can certainly warp looks like a great intake! __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

10-19-2017	#18
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, New Jersey Posts: 2,592	Re: Siamese Intake Sealing Woes I bought a good smoke machine for our shop a couple of years ago. It is THE way to locate Evap or Vacuum leaks! Working on the older Vettes with Vacuum headlight and wiper door systems made having one a must. "Smoke Signals" sometimes abound. You find one big leak, then once fixed, many smaller leaks. We had a 69 that looked like the entire engine compartment and interior were on fire! When you see smoke pouring out from under the plenum on the LT-5, you know what's next. Back to the OP. It will help to know which runner(s) are leaking, as you then can concentrate your efforts to that area of the plenum. Smoke, or the more dangerous but useful propane method will help to isolate exactly where your leak is coming from. I would not pass up the offer from Jim, QB93Z, as he has done and supervised more plenum pulls than most other mortals! Good luck and keep us posted! Marty

10-20-2017	#19
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Re: Siamese Intake Sealing Woes Obviously the intake is trash. Send it to me, I will dispose of it properly for you. __________________ 1994 #293 ZR-1 Stainless Works Long Tube Headers, B&B catback w/ X-Pipe, 18" Shelby Series One Wheels, SLP CAI.

10-24-2017	#20
Rumblin70SS396 Join Date: May 2017 Location: Delaware Posts: 48	Re: Siamese Intake Sealing Woes Guys Thanks for all the suggestions. I apologize for taking a bit to get back to you but I was in Las Vegas for a conference. I was lucky enough to get BJ on Thursday and saw some of the Z's for sale. I originally used this sealant with my gasket on both sides. https://www.permatex.com/products/ga...llac-compound/ After your suggestions, it looks like gasgacinch or the gorilla glue might be better alternatives. LGAFF, The coolant is not blocked off. That was a big issue the first time as coolant leaked out. I like your idea of the two gaskets though. QB93Z/Jim, Thank you so much for the offer of taking a look at this car in an attempt to get it right. Currently I don't have a trailer and it can't be driven this way. I believe for now I will try some suggestions first and if I can't fix it, we will work something out. RussMcB, Thank you! It's really a cool car [emoji41] rkreigh, Thanks for the suggestions including the eliminating of the secondaries and smoke machine. I have heard time and time again about the secondaries. I would like to see the impact of the current changes before o go that route though as it requires a retune from what understand and this car has its share of modifications. DRM500RUBYZR-1, Again another vote for the smoke machine.....would something like this be sufficient? https://www.amazon.com/dp/B0746SL9D6?psc=1 Seems like I could use this over and over for this and a bunch of cars including my C3. USAFPILOT, I agree, the intake is in the mail [emoji41] So here's my thinking guys: Retighten the intake and see if it eliminates the issue. Buy smoke machine above to see if I can determine leak. Reseal with double gaskets and gasgacinch or gorilla glue and retest. If all else fails set up a maintenance day with QB93Z/Jim Thank you all so much for your help......I'd really like to drive it again. PS I apologize if I missed anything as I am doing this from my phone and don't know how to use multiple quotes. Tony Sent from my iPhone using ZR-1 Net Registry