Blue Smoke - Page 2 - ZR-1 Net Registry Forums

Hammer · 04-12-2010

90's didn't have seals on the exhaust valves.

todesengel · 04-12-2010

Quote:

Originally Posted by FULLPWR

thats great !! your gonna love it, i realydont have muchtime in mine but what i have had ...nothing else can compare!!! at least to me anyway

Oh I already have the zr-1, I just want a spare lt5 to piddle with so I have it figured out before I have to work on it in the car lol

todesengel · 04-12-2010

Quote:

Originally Posted by Hammer

90's didn't have seals on the exhaust valves.

did the rely soley on a tight fit in the valve guides? Wear would certainly promotoe leakage if this is the case after some miles. Do they offer an upgrade, or is the head casting different from 90 to 91-95?

FULLPWR · 04-12-2010

Quote:

Originally Posted by todesengel

Oh I already have the zr-1, I just want a spare lt5 to piddle with so I have it figured out before I have to work on it in the car lol

told you i couldnt read

FULLPWR · 04-12-2010

I found a vacuum leak in the rubber grummet that connects to two pipes protruding out right behind th tb right under the tb linkage/elec connector that holds one blk plastic hose feeding looks like the canister in the driver side front and one pipe feeding the silicones F connection pcv 's .

would that contribute to my smoking problem?
it went back to smoking again.

jonszr1 · 04-13-2010

yes that might cause it. but first why dont you pull the plugs and see what they look like .then share what you find . on your tailshaft seal leaking . do you do the clutch and t bearing change out ./?one thing that can cause a leak is if you /someone over torqued the bolts that hold the c beam at the trans .it can distort the tailshaft causing the seal to leak .

scottfab · 04-13-2010

a 90 can have exhaust seals if someone had them retro'd in. A number of cars have been done. Mine is a 90 and hasn't. It will smoke a bit when at hi revs but out of both sides.
The best explanation I have read about why no seals were put in the 90 was that it was an English/Lotus preference for lubrication at hi rpms.

It'd look at plugs like other have said followed by a compression test.

phrogs · 04-13-2010

Quote:

Originally Posted by todesengel

did the rely soley on a tight fit in the valve guides? Wear would certainly promotoe leakage if this is the case after some miles. Do they offer an upgrade, or is the head casting different from 90 to 91-95?

Don't know what "they" relyed on but we only have seals on the intakes.

You can machine the heads for valve seals if you want to

USAFPILOT · 04-13-2010

Hey, you live just a little bit north of me...we should meet up one day.

I think you should just take the car to Corey Henderson in New Braunsfels TX and let him diagnose it before you just start throwing money at it.

There is also that guy in Conroe that built the Bonneville ZR-1 that went 220 on the salt flats. Corey built his motor, but maybe he would have an idea.

I personally am no engine specialist, but the blue smoke would bother me too.

In fact my 2004 Nissan Titan does it during start up, but only after I crank it up and then shut it right back off. I might do that when repositioning it in the driveway to get the Z out. Some of the Titan guys says they do that because all the oil gets pushed up into the motor, and then while it is shutoff it drains somewhere it shouldn't, and has something to do with the thickness of the oil right then.

The Titan is also a DOHC V8.

GL

tomtom72 · 04-13-2010

FULLPWR, when was the last time the PCV's were changed out?

Not trying to be a wise guy, but I notice on mine that after about a summer's worth of use they are pretty much gummed up. If I try to shake them the check ball is not moving freely. Our 90 motors pass a ton of oil fumes thru the PCV system and I change my PCV's every winter.

I'd just pull the PCV's and give them a shake to see if they make a good clean metallic sounding rattle....after 5k mine usually have a very muffled sound to the rattle, not metallic sounding at all. JMHO

Tom

04-12-2010	#11
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,653	Re: Blue Smoke 90's didn't have seals on the exhaust valves. __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

04-12-2010	#15
FULLPWR Join Date: Feb 2006 Location: Magnolia, tx Posts: 195	Re: Blue Smoke I found a vacuum leak in the rubber grummet that connects to two pipes protruding out right behind th tb right under the tb linkage/elec connector that holds one blk plastic hose feeding looks like the canister in the driver side front and one pipe feeding the silicones F connection pcv 's . would that contribute to my smoking problem? it went back to smoking again.

04-13-2010	#16
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Blue Smoke yes that might cause it. but first why dont you pull the plugs and see what they look like .then share what you find . on your tailshaft seal leaking . do you do the clutch and t bearing change out ./?one thing that can cause a leak is if you /someone over torqued the bolts that hold the c beam at the trans .it can distort the tailshaft causing the seal to leak .

04-13-2010	#17
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Re: Blue Smoke a 90 can have exhaust seals if someone had them retro'd in. A number of cars have been done. Mine is a 90 and hasn't. It will smoke a bit when at hi revs but out of both sides. The best explanation I have read about why no seals were put in the 90 was that it was an English/Lotus preference for lubrication at hi rpms. It'd look at plugs like other have said followed by a compression test. __________________ Scott Vett owner since 1979._It's about the car and the people

04-13-2010	#19
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Re: Blue Smoke Hey, you live just a little bit north of me...we should meet up one day. I think you should just take the car to Corey Henderson in New Braunsfels TX and let him diagnose it before you just start throwing money at it. There is also that guy in Conroe that built the Bonneville ZR-1 that went 220 on the salt flats. Corey built his motor, but maybe he would have an idea. I personally am no engine specialist, but the blue smoke would bother me too. In fact my 2004 Nissan Titan does it during start up, but only after I crank it up and then shut it right back off. I might do that when repositioning it in the driveway to get the Z out. Some of the Titan guys says they do that because all the oil gets pushed up into the motor, and then while it is shutoff it drains somewhere it shouldn't, and has something to do with the thickness of the oil right then. The Titan is also a DOHC V8. GL

04-13-2010	#20
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Blue Smoke FULLPWR, when was the last time the PCV's were changed out? Not trying to be a wise guy, but I notice on mine that after about a summer's worth of use they are pretty much gummed up. If I try to shake them the check ball is not moving freely. Our 90 motors pass a ton of oil fumes thru the PCV system and I change my PCV's every winter. I'd just pull the PCV's and give them a shake to see if they make a good clean metallic sounding rattle....after 5k mine usually have a very muffled sound to the rattle, not metallic sounding at all. JMHO Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member