Quote:
Originally Posted by Dave Bisschop
I'm not suggesting everyone run out and slide 114 lobe sep cams in their engine. The reality is lobe sep isn't really what we should be looking at as overlap, valve opening and closing events is really what should be looked at and the lobe sep ends up being what it is, but of course when spec'ing a cam and choosing the lobes to run part of placing the cam order is to specify what LSA the cam should be ground on, trying to remember all those events off the top of your head for bench racing discussion would get a little confusing. About 95% of my customer base is street/strip guys, about 6-7 years ago when the economy was booming we had a lot more customers building higher end larger engines, but most still wanted pump gas as they wanted to drive their cars on the street.
These are just a few I can think of off the top of my head. I wasn't disputing that you can run quick with the tighter lobe seps, but a street/strip car with wider lobe sep cams (read less overlap) will run cleaner and have a broader less peaky rpm range.
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Dave,
I know it is difficult to boil it down to generalities because each combo is specific, but is there a range for street overlap vs. street/strip vs. strip only that novices can use? For instance I told you I wanted to make in the area of 450hp with my daily driver 433(4"stroke .030" over 400 block) with iron heads and intake, also using RARE manifolds instead of headers and you said the Stump Puller was the cam. In my calculator it has 63.5° of overlap. Would 75° of overlap be way too much? Is ther a sweet spot for manifolds vs. headers? What does it take to figure out how much overlap?
Thanks much for spreading the wisdom!