Air venting in engine compartment

[RedRover]

Can you help me please? How much air venting does an engine need to run efficiently? mine at the mo is around 6" x 4" is that enough?

[Antares_9]

There is a formula Barry, if you check how many CFM of air your motor uses, Peachment should be able to tell you, I will work it out for you.

David

[RedRover]

Thanks david,it should'nt be a difficult job just cut another hole and screw a vent on it.as long as it is above water,don't want to be another casualty under water.

[Antares_9]

Thanks david,it should'nt be a difficult job just cut another hole and screw a vent on it.as long as it is above water,don't want to be another casualty under water.

Indeed Barry, but no point in cutting a bigger hole than you need :-D