Re: Engine Pressure Blowing Oil
[Re: hemi-itis]
#1048116
08/06/11 08:24 PM
08/06/11 08:24 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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No no e vac system. should I get one?
No... not with a full exhaust... a E-vac will pull a max of 5"hg and with a exhaust for every inch of back pressure you reduce the effectiveness by that same amount so if the exhaust is greater than 5"hg it will pressurize the crank case
Mr P,I thought the one way valve for the evac system would prevent that from occuring.
If you start backing up that heat, that valve wont last for a minute
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Re: Engine Pressure Blowing Oil
[Re: MR_P_BODY]
#1048120
08/07/11 03:41 PM
08/07/11 03:41 PM
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Joined: Sep 2005
Posts: 1,329 St. Louis, MO
mopardamo
pro stock
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pro stock
Joined: Sep 2005
Posts: 1,329
St. Louis, MO
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Hello,
I had some similar problems on a car with a full exhaust. The tubing was not welded to the end of the reducer. The tubing was inserted past the reducer end over an inch. This caused a bunch of back pressure that only showed up for me at the track. Intake leaks, dipstick pushed up, ballooned up pan, leaks etc. This was a fresh motor also. Do you have a full exhaust?
Damon
What are you referring to when you say tubing
The 2.5" exhaust pipe was inserted thru the reducer and not mated to the end of the reducer just off the header collector. Caused a heck of a reversion that caused back pressure into the heads and then into the chambers from what I can tell. When the exhaust was corrected the problems went away. No other changes were done.
Damon
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Re: Engine Pressure Blowing Oil
[Re: dumbdog70]
#1048121
08/07/11 04:43 PM
08/07/11 04:43 PM
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Joined: Jul 2008
Posts: 30,632 Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Man ... people talking about PCV tubes, windage trays and scrapers ...... I talked to a Bud of mine in FL last nite ... this topic was brought up and he actually TESTED THIS some years back. He plumbed-in a air fitting into a motor he was going to rebuild ... and put 80 psi into the oil pan to BALLOON-UP the valley-pan like that. What you have here is some major BLOW-BY ... like holes in pistons or busted up rings.
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