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Re: Major blow-by on fresh engine
[Re: 2boltmain]
#339023
06/07/09 02:01 AM
06/07/09 02:01 AM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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I agree cranking compression and a leak down are the first things that you need to do.This sounds like a classic problem with novice mechanics as the first owners appear to be. If I read your post correctly.If the numbers are good then the following is null and void, if not continue.At the start up they very likely had 1 of 2 the following problems.1st it was cranked way too long without starting gas washing the cyl walls or 2. they overheated it on the initial start up.Either of those 2 issues wil keep the rings from seating.If it was overheated it will pull the moly right out of the rings.If gas washed good-bye hone job.
The Bon-ame job is an old racers trick.It will help for a pass or two but then go away.I do NOT recommend it in any way.
Leave the gun.......take the Cannoli's....Mike
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Re: Major blow-by on fresh engine
#339025
06/07/09 08:19 AM
06/07/09 08:19 AM
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Joined: Jan 2003
Posts: 1,267
midwest
sg333e
super street
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super street
Joined: Jan 2003
Posts: 1,267
midwest
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I wouldn't use an additive but would certainly switch to a high zinc break in type oil again. Can't hurt at this point.
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Re: Major blow-by on fresh engine
[Re: derekeh]
#339028
12/04/09 05:43 PM
12/04/09 05:43 PM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Harbor freight??
You will never get seal if you are pressurizing the crank case. Put a new PVC in(like 2 bucks man??) and a breather on both valve covers. let her breath then let her rip!!!
I would change the oil to a proper oil 20/50 and some zink additve (comp cams)
Last edited by Dodgem; 12/04/09 05:44 PM.
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Re: Major blow-by on fresh engine
[Re: MoparJoe]
#339031
12/04/09 06:49 PM
12/04/09 06:49 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
On my lastest 318 with moly rings they sealed within 4-5 min, well before I finished breaking in the cam,
this i don't understand, how would you know when the rings are seated?
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Re: Major blow-by on fresh engine
[Re: mickm]
#339032
12/04/09 07:21 PM
12/04/09 07:21 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
On my lastest 318 with moly rings they sealed within 4-5 min, well before I finished breaking in the cam,
this i don't understand, how would you know when the rings are seated?
Pull the breather and put a clean white towel over the opening. When it first fires, the towel will start to turn dark because of the blow by. After a minute, more or less, put a clean spot over the opening and repeat. The stain will turn gradually lighter. After a few minutes of break in the towel will stay nearly clean.
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Re: Major blow-by on fresh engine
[Re: 64Post]
#339033
12/04/09 08:26 PM
12/04/09 08:26 PM
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Joined: Dec 2007
Posts: 587
minot north dakota
ledft79
mopar
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mopar
Joined: Dec 2007
Posts: 587
minot north dakota
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I have had a couple of engines that were freshly rebuilt before I bought the cars, that realy smoked. I always suspected that the rings were installed wrong or never seated properly. One was a 383 and the next was a 318. Both were in 71 challengers. I never did get to the bottom of it, just changed out engines.
DRIVE EM, DONT HIDE EM.
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Re: Major blow-by on fresh engine
[Re: 64Post]
#339034
12/04/09 09:13 PM
12/04/09 09:13 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
Pull the breather and put a clean white towel over the opening. When it first fires, the towel will start to turn dark because of the blow by. After a minute, more or less, put a clean spot over the opening and repeat. The stain will turn gradually lighter. After a few minutes of break in the towel will stay nearly clean.
isn't air being sucked in at the breather? with the pull coming from the manifold vacuum through the pcv at the other side?
and once i get this straight, this would be a good test for any engine to see how much blowby there is, yes?
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Re: Major blow-by on fresh engine
[Re: Dodgem]
#339037
12/04/09 10:45 PM
12/04/09 10:45 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
We're riding a dead horse hear boys he has not posted anything on moparts since june 6th
yeah, but we seem to be on to other stuff now 
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Re: Major blow-by on fresh engine
[Re: mickm]
#339038
12/04/09 11:15 PM
12/04/09 11:15 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
Pull the breather and put a clean white towel over the opening. When it first fires, the towel will start to turn dark because of the blow by. After a minute, more or less, put a clean spot over the opening and repeat. The stain will turn gradually lighter. After a few minutes of break in the towel will stay nearly clean.
isn't air being sucked in at the breather? with the pull coming from the manifold vacuum through the pcv at the other side?
and once i get this straight, this would be a good test for any engine to see how much blowby there is, yes?
The PCV gets blocked and the breather removed from the opposite valve cover. When the engine is first fired it's taken to 2000+ rpm to break in the cam. The open hole in the VC will look like a smoke stack. As the rings seat the smoke decreases to the point where it's barely visible. Placing a clean towel over the hole merely confirms that the rings have seated as much as they're going to. Generally, this only takes 5-7 minutes.
I would think you'd have to get the engine under load on a chassis dyno to check blow by on an older build.
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Re: Major blow-by on fresh engine
[Re: 64Post]
#339039
12/05/09 12:03 AM
12/05/09 12:03 AM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
I would think you'd have to get the engine under load on a chassis dyno to check blow by on an older build.
ok, got it. thanks!
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Re: Major blow-by on fresh engine
[Re: mickm]
#339040
12/05/09 12:43 AM
12/05/09 12:43 AM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
I would think you'd have to get the engine under load on a chassis dyno to check blow by on an older build.
ok, got it. thanks!
Hey, I'm not claiming to be right...  I just guess at all this car stuff. 
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Don't put in any foreign materials or 'mechanic in a can' type products. You will want to fix it right, not pouring in crap in a can and praying it works and doesn't toast your bearings, cam, etc.
