Location: Brisbane / Gold Coast
Registered: May 2002
Re: Valve lift?
Wed, 16 November 2005 10:33
shelldrake wrote on Wed, 16 November 2005 18:24
Someone told me that once the valve opens 1/4 of its diameter, there's no more flow increase. So, purely longer duration gives you more flow per intake stroke once the 1/4 dia lift is reached.
Can someone confirm this.
Nope, it's wrong. Really crappy head might do that, but a 4AG will keep on increasing flow up to heaps of lift.
However, it's true that tha vast majority of flow is gained up to about 1/3 of the diameter of the valve.
From my site ->
"Ok, I've got a good example here of some flow figures for a basically standard Toyota 4AGE TVIS 1600cc twin cam head @ 10" of water.
Inlet port -
Lift CFM
Wed, 16 November 2005 10:33
