As title stated, can anyone explain to me what are the primary causes of intake reversion? I know its normal to have some for extend but does it directly reflect the health of the motor? My IM is pretty black inside, need your advise and explanation what might be happening and solution!

 

The black inside your intake manifold is most likely due to the Exhaust Gas Recirculation (EGR) system and/or oil vapors passing through the Positive Crankcase Ventilation (PCV) system.

 

Ya but b-series doesnt have true egr, and i dont have pcv system through intake. I just run catch can. Where is this coming from? My exhaust isnt flowing good enough???

 

50% correct

keep researching

 

I came to conclusion that my exhaust isnt flowing good enough and too much of compression for the small of cams isnt really helping neither. Ill upgrade the exhaust to 3inch all the way to muffler and trying to source skunk2 tuner2 and try actual degreeing this time. Hopefully solves this issue.....

 

reversion or reverse flow occurs because a pressure differential exist--most times briefly

actually, all flow occurs of a pressure differential--flow is flow regardless of direction

there are a couple things that can be done or designed to reduce reversion

good work, keep up your good research

 

Thanks man