How much blow by is too much blow by??
Aug 31, 2013, 12:41 PM
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How much blow by is too much blow by??
Hey Guys, I'm having an issue which I'm sure some of you have faced. I have a built 2.4l stroker motor and just finished breaking it in. At first I noticed I had some blow by when I would boost the car at about 25psi and learned that because the dip stick would pop out.
When I noticed that I bought a catch can and hooked up 1-10an line and 1-6an line to the valve cover. Along with that I got a 6an line going from the dip stick to the catch can. That solved the problem for the dip stick not popping out and relieved some pressure.
Prepping the car for tuning, I went to boost leak pressure test the car and noticed ALOT of blow by. I plugged off all 3 lines going to the catch can but then air would be seeping out of the oil cap. I shouldn't say seeping, I should say extremely pissing out air and this was just at 18psi. I opened the oil cap and it felt like most of the air was coming out of there.
Has anyone experienced that much blow by? Is that normal for built motors? I know it depends on how "loose" the motor was built but not sure how loose is too loose.
Should I continue to attempt to pressure test the car and star tuning the car?
Info about the motor.
Freshly built 2.4l with CP pistons and rods.
When I noticed that I bought a catch can and hooked up 1-10an line and 1-6an line to the valve cover. Along with that I got a 6an line going from the dip stick to the catch can. That solved the problem for the dip stick not popping out and relieved some pressure.
Prepping the car for tuning, I went to boost leak pressure test the car and noticed ALOT of blow by. I plugged off all 3 lines going to the catch can but then air would be seeping out of the oil cap. I shouldn't say seeping, I should say extremely pissing out air and this was just at 18psi. I opened the oil cap and it felt like most of the air was coming out of there.
Has anyone experienced that much blow by? Is that normal for built motors? I know it depends on how "loose" the motor was built but not sure how loose is too loose.
Should I continue to attempt to pressure test the car and star tuning the car?
Info about the motor.
Freshly built 2.4l with CP pistons and rods.
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Sep 9, 2013, 11:32 AM
#9
Getting a lot of blow-by during the break-in is normal as the rings seat. How many miles is on the motor now? There is a thread started by TScomp about the blow-by issues you should search. When I built my motor, I also got a ton of blow-by the initial few hundreds. Once break-in was done and I started to track the car, I'm barely getting any. Like the prior post, it depends on clearance also.
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