Originally Posted by richm
Please explain what the benefits are of breathing from the camcover INSTEAD of from a second opposite side crankcase port??
Whilst there
may be some benefit in taking pressure from the camcover
as well as 2 crankcase ports, if the crankcase breathing is adequate there should be no appreciable camcover pressure anyway..
I don't think there is any benefit from breathing from the cam cover, all you are trying to do is deal with the combustion gases that have got past the piston rings. If you can extract them from the block (ie at source) then as GGR said the oil can drain from the head without being restricted by the flow of gases upwards. That said, a lot of heads have a dedicated passage through the head for the gases that the oil cannot drain down. I also recall that classic formula ford pinto engines were fitted with an external drain for the oil and the air passage was blocked off in the head. Many ways to skin a cat.......