Re: Engine Pressure Blowing Oil
[Re: dumbdog70]
#1048098
08/06/11 11:09 AM
08/06/11 11:09 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Make sure the breather is open - not pushed in against the oil baffle, etc. If there are no breather restrictions, it's time for a leak down test. At idle, if the PCV valve is working properly and you have good ring seal, you should actually have a negative pressure in the crankcase.
Fastest 300
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Re: Engine Pressure Blowing Oil
[Re: dumbdog70]
#1048103
08/06/11 12:05 PM
08/06/11 12:05 PM
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Joined: Jul 2008
Posts: 30,253 Florida STAYcation
dIc dOc Deity !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
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Quote:
Have a 440 stroker with stealth heads roller cam. Had it to drags last night after first pass came back to pits. Dipstick was blown halfway out of tube, oil was coming out of breather and pcv valve, also valley pan was ballooned up to where it was touching the bottom of the intake. Car has 1 push in breather and a pcv valve. Does it need another breather? any ideas? Thanks
The last motor I saw like this had some serious probs ... like a dime-sized hole in one of the pistons.
As suggested before .... do a leak-down test or AT LEAST a compression check. To blow-up a valley pan like that requires some BIG TIME blow-by.
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Re: Engine Pressure Blowing Oil
[Re: Cab_Burge]
#1048105
08/06/11 02:55 PM
08/06/11 02:55 PM
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Joined: Nov 2003
Posts: 3,399 Dandridge TN
Dabee
master
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master
Joined: Nov 2003
Posts: 3,399
Dandridge TN
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Quote:
I now calibrate all the dipsticks on my new or used motors by measuring the quarts used compared to the dipstick readings
Dipsticks are like people, no two dipsticks are alike. Calibrate it.
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Re: Engine Pressure Blowing Oil
[Re: Dabee]
#1048106
08/06/11 03:01 PM
08/06/11 03:01 PM
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Joined: Jul 2006
Posts: 9,366 Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
Quote:
I now calibrate all the dipsticks on my new or used motors by measuring the quarts used compared to the dipstick readings
Dipsticks are like people, no two dipsticks are alike. Calibrate it.
Same here....the 408 with 8qt Moroso pan showed a quart low on the new stick I just installed....going to cut .5" off the tube
Rickster
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Re: Engine Pressure Blowing Oil
[Re: mopardamo]
#1048108
08/06/11 04:19 PM
08/06/11 04:19 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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Quote:
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
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Re: Engine Pressure Blowing Oil
[Re: dumbdog70]
#1048110
08/06/11 05:16 PM
08/06/11 05:16 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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Quote:
I do have full exhaust. 3 inch flowmasters exit out the rear. Buddy is having similar issues. Really the only common thing between engines are the stealth heads. I did notice that on those heads where the push rods go thru them there is just a hole for the pushrod they are not"open" like a cast iron head. Dont know that that makes any difference just an observation. Im going to change the oil noting the amount and do the leak down test. I did pull the breather and pcv valve they are extremely close to the baffle in the valve cover about 1/8 inch
ABOUT a 1/8" is getting close... if its closer than that it could build pressure... are you running a E-vac system with a full exhaust
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Re: Engine Pressure Blowing Oil
[Re: dumbdog70]
#1048113
08/06/11 07:24 PM
08/06/11 07:24 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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Quote:
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
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