i have a fealing this is going to be one of those stupid questions that i shouldnt be asking but my brother asked me about it today, what the hell is blow by

 

in a gasoline motor its the oil and compression lost through leaky rings and poor valve seats and seals maybe its the same???

 

Here is a pretty good explanation

Engine Blow By

 

i was right. i feel like i just won a million dollars, wow that feels good!!!!!

 

94ccummins, I notice you have an exhaust brake, this can be a cause of blow by too. What can happen is the exhaust side seal within the turbocharger can be blown, allowing the exhaust backpressure generated by the exhaust brake to bypass, the backpressure then goes down the oil drainback tube into the crankcase and out the breather tube. You can check it with the engine at normal operating temperature, look at the crankcase breather tube for blow by, then apply your exhaust brake. If you only see blowby with the exhaust brake applied then it could be the turbo seal OR bad exhaust valve guides. Blowby through the valve guides is more common on 24 valve engines then 12 valve engines as you have two exhaust valve guides per cylinder for the exhaust backpressure to travel up into the engine and out the crankcase vent tube. I hope this helps.

 

i dont have any on my dodge but my brother was curious on his 96 12v so i thought i would ask thanks though, i wont have a problem with it since my head is built tough