Quote:
Originally Posted by CBRBob
Put the hose from the crankcase vent to the airbox back on. You want negative pressure in the engine as much as possible. You read about how 'improved crankcase design drops pumping losses'. All that means is they found a better way for the air to move from the underside of one piston to the other easier. If you make a vacuum in the crancase, there is less air for the bottom of the piston to push against, hence, less power lost, and no oil drool on the outside of the engine.
One trick you will find in dragracing is that they have several vacuum pumps on the crankcase to gain power. Keeping the hose to the airbox helps, there is nothing to be gained by removing it.
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Quote:
Originally Posted by Cakes982
Leaving it can cause oil mist to mix in with the air/fuel mixture...it's pretty much only routed that way for emissions.
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Guess you didn't read that post....
