Lets talk valve size and power gains.
12-26-2003, 06:04 AM
#1
Lets talk valve size and power gains. Do bigger valves really make a difference on our engines?
Here is what I'm thinking.
422 stroker-
2.02/1.60 valve's with 242/242 .610/.610 lift on 112.
compared to
2.08/1.60 valve's with 242/242 .595/.610 lift on 112
My question is if you run a higher lift on a smaller valve,will it be just as good as the bigger valve with lower lift?
Thanks for all reply's
Here is what I'm thinking.
422 stroker-
2.02/1.60 valve's with 242/242 .610/.610 lift on 112.
compared to
2.08/1.60 valve's with 242/242 .595/.610 lift on 112
My question is if you run a higher lift on a smaller valve,will it be just as good as the bigger valve with lower lift?
Thanks for all reply's
12-26-2003, 11:50 AM
#2
IMO...the flow at .200, .300, .400 .500 .595 will be higher with the 2.08 all things being equal on a 4.1 to 4.125 bore. These events will occur two times as the valve opens then again as it closes. So for ~95 percent of the intake valve event the 2.08 would have the edge. The very bried instant the 2.02 would have to make up for all of this is only .595 to .610 and I don't think that's enough as the duration of the cam is far less at .595 to .610 valve lift than it was between .200 to .595
Likewise the LS6 intake can knock ~50 cfm off of the flow numbers compared to no intake. Depending on the heads and how they flow the ~same amount of air that's moved at .500 lift maybe more at .610 lift. In that case the 2.02 would offer no advantage at any lift in flow.
What do your heads flow w/ and w/o intake?
Likewise the LS6 intake can knock ~50 cfm off of the flow numbers compared to no intake. Depending on the heads and how they flow the ~same amount of air that's moved at .500 lift maybe more at .610 lift. In that case the 2.02 would offer no advantage at any lift in flow.
What do your heads flow w/ and w/o intake?
