Q45tech wrote:Read an article about why GM still uses 2 valves it can make 85-90% of power and save $600 [3 cams, 16 springs and valves etc] , plus of course 2V is almost 7" narrower in width plus the weight savings from no extra cams springs and valves vs single cam and push rods
Don't confuse 4V PENTROOF designs with Hemisperical with 2V or the hybrids MB Cloverleaf with 3 or 5 valves [Audi] or Honda Cloverleaf with 4 valves.
You can buy [$9,000] 4 valve heads for a 350 chevy engine that will scream
I do when I pass on the highway. Two valve pushrods generally wheeze above 5500, unless they are tuned for high rpm. If they are so tuned, then low end sucks from too much overlap (no variable valve timing with pushrods).louiegz wrote:Who needs to redline when you get most of your power in the low end.
maxnix wrote:I do when I pass on the highway. Two valve pushrods generally wheeze above 5500, unless they are tuned for high rpm. If they are so tuned, then low end sucks from too much overlap (no variable valve timing with pushrods).
Notice that Mercedes is abandoning their "best compromise for the street" 3 valve single cam, low end torquers for 4 valve heads again?