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I wish I had the figures in front of me, but I remember being suprised when somebody bench flowed the 8v and 12v heads, and there was less difference than I thought.....
but unfortunately I cant back up the info any better than that, except to say that the flow limit of the 8v is about 280hp. dont know what the upper limit of the 12v is.
I believe the exhaust valves in the 12v are actually smaller than 8v, 34mm as opposed to 36mm.
the two inlet valves are 32.5mm vs 44mm on the 8v....if the flow equated just to valve area, then the inlets on the 12v would flow only 10% more....
I know it doesnt work like that....but my point is that its not that different in flow. so the tricks on the 8v head might translate across, in terms of required lift duration and timing.
as for the difference in power between the 12v and 8v 2.0 sohc engines, there were a few other differences, the 12v 2.0 had 9.5:1 comp as oppsed to 8.6 on the 8v, plus the 8v head had three different cam profiles depending on EFI/Carb and the country you live in, pretty sure the 12v was the same everywhere....plus very few AUS & NZ 8v models had EFI where as most of the 12v ones did.
but at the end of the day, your better to piss them both off and get the 16v
Last edited by chief tool : 5-15-08 at 3:02.
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