Vented Rocket cover

[Weq]

hi all, i've seen on some hi-powered apps they have a vented rocket cover (don't bother about talking about the PCV i know how that works)

See this is the your problem. You DONT know ANYTHING about the PVC system is u think this isnt related.

Positive Crankcase Ventilation.

The head is connected to the crank case (bottom end) via many oil passages. as pressure builds, it builds in the topend of the motor. These ports are useful in hi-po setups. Or setups were ring-gaps/piston to wall are kept a little larger, increasing pressure inside the motor. These help evacuate the increased gas volume, quickly and efficently.

On a stock motor with good compression, its just a little bling. A normal catch-can setup will have the same effect.

[Limbo]

See this is the your problem. You DONT know ANYTHING about the PVC system is u think this isnt related.

Positive Crankcase Ventilation.

The head is connected to the crank case (bottom end) via many oil passages. as pressure builds, it builds in the topend of the motor. These ports are useful in hi-po setups. Or setups were ring-gaps/piston to wall are kept a little larger, increasing pressure inside the motor. These help evacuate the increased gas volume, quickly and efficently.

On a stock motor with good compression, its just a little bling. A normal catch-can setup will have the same effect.

i know that as i already have a catch can setup. I was wondering if there was anymore benefit in getting the rocker cover vented more than the PCV setup.

This is how mine is already setup





I was speaking to a yamaha racing mechanic and he said that the increase in pressure helps crease more power, but at more wear to the engine.
But since they rebuild their engines every 2nd race it didn't matter.

I'll be looking into getting the extra openings in my rocker cover also, just need a spare rocker cover to work on.

[e240]

I was speaking to a yamaha racing mechanic and he said that the increase in pressure helps crease more power, but at more wear to the engine.
But since they rebuild their engines every 2nd race it didn't matter.
.

You might want to confirm exactly what the mechanic said - In these engines, they run a one way valve after the catch can routing to the airbox. What this does is it creates "negative" pressure in the crank case (when there's suction from the crankcase, the one way valve shuts, arresting the suction), this has been known to increase power, it doesn't actually create more wear to the engine.

:-p I had this similar WSB setup in my Ducati once upon a time.