383 Stroker with blow by PCV problem - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2013, 11:01 PM
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383 Stroker with blow by PCV problem

Bought a C10 with a 383 installed. It had a blow by problem with the oil breather/catch can installed. PCV was removed and capped. I installed a PCV connected to air filter and blow by problem still present. I now have a double pcv system. One going to air filter the other to intake. I adjusted timing to 12 btdc at idle and 34 at 3000 rpm. I ran it up the freeway today to check timing and got on it. Pushed rpm up to 4100 to check timing, power, etc. When I exited freeway I filled the street up with white smoke. It looked like the truck had caught fire. PLEASE I need help to figure out this oil pressure problem. What could I have done to cause this smoke? It was not present before the pcv system was installed.

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Old 03-29-2013, 11:21 PM
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check cooling system for milky contaminants.
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Old 03-29-2013, 11:23 PM
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sounds to me like the excessive blow by is now getting sucked into the engine, and the smoke you saw was the excess blow by (oil) burning in the cylinders. There should not be that much blow by. I run adrag car with no PCV or header evacuation, and the motor has extra ring gap for nitrous, and I have very little blow by at all.

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RUFF 73 C10 (03-29-2013)
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Old 03-29-2013, 11:25 PM
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could you smell the smoke to tell if it was oil or steam?
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Old 03-29-2013, 11:37 PM
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I couldn't smell the smoke. I already checked to see if oil was bad like coolant was mixing with it. It wasn't. I resealed the valve covers. I have no idea why some much pressure is being created in the crank case.
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Old 03-30-2013, 12:53 AM
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excessive blow by can be caused by a few things:
bad hone job in the cylindres
incorrect piston-bore clearance
incorret size rings
too much ring gap

Im sure there are others that someone may chime in on

Chevyguy13
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Old 03-30-2013, 08:30 AM
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First you had no pcv then you installed a pcv wrong by hooking it to the air cleaner. Pcv hooks to manifold vacuum source. Then you have a breather which can be hooked to the air cleaner or the breather can just draw air from the engine bay.
Pcv on one cover, breather on the other.
Pcv uses vacuum to pull fresh air into the motor which mixes with the blowby fumes and into the motor to be burned.
2 pcv's won't work if one is hooked to the air cleaner like you have now. The other one has no air supply.
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Old 03-30-2013, 10:22 AM
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if its wrong

What would be a better set up? Should I just go back to figure out the blow by problem at the valves?
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Old 03-30-2013, 10:31 AM
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Take a pic of your motor so we can see what your pcv set up is like. If you get a correct pcv system you might have no problem with blowby.
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Old 03-30-2013, 12:02 PM
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After the engine is warmed-up real good, remove both pcv valves. Either chock the wheels or have a friend hold the brakes while its put in drive. Does a lot of smoke come out of the pcv ports? If it does it may need compression and leak down testing done to see if rings are worn too much.
ssmonty
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Old 03-30-2013, 12:04 PM
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I agree and disagree with RWENUTS.Some engines did have one going to the aircleaner, with out a PCV on it, just basically a vent from passenger side valve cover to a little filter inside the air cleaner. While on the drivers side would be a pcv valve in the valve cover hooked to manifold vacuum. It does not pull in fresh air! It pulls out blowby, moisture and other gases created by the combustion process. It pulls it out and sends it back through the engine to get "re burned" no matter what you have for a pcv system you should not have that much smoke. You have other issues.
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Old 03-30-2013, 01:18 PM
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True! Some have a line hooked to the air cleaner. Some have a breather. You need some where to get air in to the motor to mix with the fumes. Plug off the breather hole and the pcv shuts on the other valve cover. A vacuum can't pull on a vacuum. It deadheads. That's why you need to supply some air with the breather to mix with the fumes.
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Old 03-30-2013, 01:57 PM
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I understand your "fresh air" point now. Makes sense.
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Old 03-30-2013, 04:28 PM
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ok

I will take the tips provided and see what I come back with. Thank you all for the help. Being new to this had been intimidating but it definitely helps when people give their help.
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Old 03-30-2013, 05:39 PM
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When you ran it up did it detonate really bad? Last time I ran my blower car at the strip, third run it layed down at 1,000 feet, and instant blowby. Had to drive it home 50 miles like that, looked like I was on fire. Found 7 pistons burned and pounded so bad I couldn't pull the rings (C&A gapless) from the grooves, couldn't hear detonation that killed it.

Before that I had no PCV system, but didn't have any issues with blowby. When I rebuilt the motor I did go with PCV. This is worst case, but just sayin...do a compression check.
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