Quote:
Originally Posted by rod
OK, I didnt think this would be so complicated.
these are actual figures for my SBC 292 [misnamed] turbo heads.
28" H2O @ 70 degrees and at about 575' elevation and almost no humidity.
Intake exhaust
.200 151 136
.300 210 181
.400 246 210
.500 265 223
.510 267 223
no increase, on either side, after.510 lift.
so I understand, that some additional lift could be used, above .510, to make up whatever type of loss. even some extra amount of duration, for the same reason.
however, on my desk top dyno, there is no increase in power output, past about 525" lift.
it appease, on paper at least, that you are just wearing out springs and guides, with additional lift. maybe in the real world, there might be some benefit.
so, new thoughts.
thanks all
Rod in AZ
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Rod,
While there is no increase, on either side, after.510 lift. The question still stands what is the flow @ .550" and .600" If it basically leveled off is one thing If it drops and or goes turbulent is another thing. In your desk top dyno program have you entered any flow numbers for .550" or .600"?
Stan
PS Let ask what is your combination? Is it possible that your desk top dyno program is not showing and increase in HP with more lift because you already have the needed flow?