I am getting a small amount of blow by from my breather filter. I have 1200 miles on my rebuilt forged motor. I was running a GST pump with stock injectors and a 12-1 FMU. The motor hasn't even seen 5 psi of boost yet that the waste gate is set to.
I did a compresion check on it and everything jumped right up 185. There is a small amount of oil on the first 2 threads of the spark plugs.
What could this be.
Built 420a NER turbo kit T3/T04s ball bearing AFX UDP Crane 0014 cams
#53759, "RE: blowby?????" In response to Reply # 0
Sounds like your VC spark plug well gaskets are leaking..If you run around 8.8:1 compression, 185 psi is great. Thats exactly what i get for comression on my motor.
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#53814, "RE: blowby?????" In response to Reply # 3
if:
1. you've run almost no boost 2. just rebuilt with forged internals 3. seated the rings properly 4. have 1200 miles 5. have 185 PSI of compression across all 4 cylinders
then your engine is running perfectly IMO. a little oil won't hurt anything. nothing seems broken to me at all.
what tempature did you do your compression test at? if the engine is cold the forged internals will not be up to tempature resulting in a little too big piston-to-bore clearance creating blowby, or "piston slap". sounds kind of like a diesel engine. everyone with a rebuilt 420A has this happen to them. it's not a problem at all.
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