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does anyone know what is an ideal internal catch can volume?

i have designed a can i am getting made and its internal volume

is around 600ml is this enough?

should there be baffles as i am told by some?

i do not want to use stuffing as suggested by some for fear of it finding its way back to the motor. though unlikely i don't want to risk it.

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I have only ever experienced a catch can filling itself once (very scary)...

Just make sure you regularly empty it. If you get more than 100ml in it after a hard days thrashing then there are serious issues. But technically you need the catch can to be the capacity of the sump, that way if your engine does decide to blow all its oil out the breathers then at least you won't cover the dragstrip/racetrack with oil.

Seriously though 600ml should be heaps...

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