Vented Rocket cover

[Mitchman]

can anyone tell me on the H22 head its stated as an EGR that sits on the top of the oem manifold yet seems to do the same thing as a PCV.... it re circulates crankcase gasses that pass the rings then back in to the IM...
are they not the same thing?

[Mitchman]

my thoughts were that was it also but on the lude iv always only seen it spoken of as a EGR. . . meh peoples just had it wrong. Cheers for that

[trism]

PCV postitive crankcase ventialtion

egr-exhaust gas recycler

[Limbo]

Just releases pressure from the engine, good for boosted cars. Remove the pcv system from the back of your block and run it to a catch can.

I've already done that but not catching anything

[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.

[Weq]

Racing application and street application are very different. People often get caught up wanting the best of both worlds. But dont realise how often race (track/strip) cars are rebuilt/maintained.

This system is still PVC. Dont get confused. You are still utilising the stock catch can on the rear of the engine.

[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.

[Limbo]

i think that's what he was saying but, he told me the compression was way up and caused greater wear.

Just need to get some time to work on the car now. Life's hectic with renovations