Smoke from exhaust
Thread Starter
Instructor
Joined: Dec 2019
Posts: 167
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From: Corpus Christi Texas
Smoke from exhaust
Team,
Apologies for my last post about electrical problems. I realized how dumb it was as soon as I posted it. Anyway, my 85 rums pretty good. Fast and responsive. I am in the Army, so the vette sits for long periods. I have noticed a small amount of smoke when I step on the throttle. There is a puff and then it goes away. Seems to be gone once the car was up. I have good compression in all 8 cylinders. Around 152psi.
The car is almost 40 years old. Based on experience, would anyone here be going into the motor to rebuild pistons, etc. Plugs are not fouled when I pull them. I have rebuilt the entire fuel delivery system and all of the gaskets for the air intake. I would really like to know what anyone out there thinks about this. Thanks
Mark B in Texas
Apologies for my last post about electrical problems. I realized how dumb it was as soon as I posted it. Anyway, my 85 rums pretty good. Fast and responsive. I am in the Army, so the vette sits for long periods. I have noticed a small amount of smoke when I step on the throttle. There is a puff and then it goes away. Seems to be gone once the car was up. I have good compression in all 8 cylinders. Around 152psi.
The car is almost 40 years old. Based on experience, would anyone here be going into the motor to rebuild pistons, etc. Plugs are not fouled when I pull them. I have rebuilt the entire fuel delivery system and all of the gaskets for the air intake. I would really like to know what anyone out there thinks about this. Thanks
Mark B in Texas
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
How many miles are on the car, if under 100K I wouldn't sweat anything but Valve Seals. Odds are your seals have gone hard and oil is sliding down the Valves, So a set of stem Seals.
Thread Starter
Instructor
Joined: Dec 2019
Posts: 167
Likes: 10
From: Corpus Christi Texas
There are 133k on the car. Like I said it is running well otherwise. My guess is that once it warms up and metals expand it gets better. Thanks for the advice. Valve seals seem pretty simple. I have never rebuilt a motor, only done some minor work on the top end in the past. This seems a similar level of maintenance.
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Get a good set of Umbria style valve Seals, if you're mostly handy with a wrench you can do it give you tube a quick look for valve seal replacement for small block chevy to get a feel of the job.
Thread Starter
Instructor
Joined: Dec 2019
Posts: 167
Likes: 10
From: Corpus Christi Texas
thanks, I do all
of my own work. Learning a lot. YouTube as saved my *** many times. I was just looking up valve seals and they are not expensive. Plus I am assume a valve job will need to be done once they are installed to set the proper clearance. When I retire from the Army in 24 I plan on pulling the engine and really going to Vette school in my garage.
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Valve adjustment is a must because you will remove the rockers, Valve Job is a Whole next Opp. If you plan on pulling it in 24 months as a retirement project and if it's a puff now and then I would let it Puff and take care of with engine rebuild in future. Don't get me wrong if it's a smelly smoker Jump on it
Last edited by s carter; Sep 18, 2022 at 03:00 PM.
Thread Starter
Instructor
Joined: Dec 2019
Posts: 167
Likes: 10
From: Corpus Christi Texas
Valve adjustment is a must because you will remove the rockers, Valve Job is a Whole next Opp. If you plan on pulling it in 24 months as a retirement project and if it's a puff now and then I would let it Puff and take care of with engine rebuild in future. Don't get me wrong if it's a smelly smoker Jump on it
just a bit now, if it gets worse I will pull the valve covers and get to work. Seems straightforward and not any tougher than the work I have done so far. It will be new so I will take my time and mark down part as I remove them for easier reinstall. Thanks again
