blow- by

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Aug 29, 2012 | 11:29 AM

JustAFooL

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From: Tennessee

blow- by

I'm in the process of tearing my car down for my head swap. Heads are milled to 59cc so I'm looking at a serious bump in compression. Is this what cause blow-by? Just curious as I'm about to order everything and was just curious if I need a catch can too..

Aug 29, 2012 | 01:42 PM

mark21742

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From: PA/MD

I'd recomend a catch can on any build....I bought one off eBay for around $35....liked it and bought two more for the other cars

Aug 29, 2012 | 03:02 PM

JustAFooL

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From: Tennessee

What exactly us It and what causes it

Aug 29, 2012 | 05:00 PM

outkast6991

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From: lancaster,pa

Blowby is compression gasses making it out the chamber

Aug 29, 2012 | 05:13 PM

ZeeOSix

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Specifically past the piston rings and into the crankcase. Higher compression will cause more blow-by because there is more cylinder pressure that the rings need to hold back.

Aug 29, 2012 | 05:49 PM

JustAFooL

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Does a catch can stop it from smoking or what??

Aug 29, 2012 | 06:15 PM

mark21742

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The catch can "catches" the oil, but let's the air/pressure back through the intake...the lower the pressure in the crankcase the better the rings seal and the less blow by you have

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Aug 29, 2012 | 09:13 PM

outkast6991

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From: lancaster,pa

It won't hurt but it won't fix worn rings either. A catch can will yield better results

Aug 29, 2012 | 09:43 PM

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chevybayboy

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Quote:

Originally Posted by outkast6991

It won't hurt but it won't fix worn rings either. A catch can will yield better results

Where can you buy this catch can ?? You say on eBay what do I search for ?

Aug 29, 2012 | 09:51 PM

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JustAFooL

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From: Tennessee

Ok, my motor is at 100k, never been on juice or boost, only on cam for the past 5k. Never really been ran hard either in comparison to others. What do you guys think about my rings?? The reason I'm so concerned is I hate seeing smoke and unless I can help it, I about refuse to see it.