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07-27-2007, 10:15 AM #1
valve overlap questions/discussion
i still cant quite wrap my head around all aspects of the centers a cam is ground on. if you have a high overlap (low l.s.a.) what does that do to the powerband versus a low overlap cam that specs the same?
in other words, if i get the 224/224, whats the difference going to be between a 112 and say a 114 in terms of powerband? of course there is more chop at idle but i know all of that.
i want to get a cam, ive done the research but i was told there is a difference, however slight, that a powerband is narrower or wider depending on the overlap. just need clarification. thanks guys.
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07-27-2007, 03:48 PM #2
in short, the closer the LSA, the more mid range power for a shorter amount of rpms. the further the LSA, the less mid range (same cam, smaller LSA), but carries out longer throughout the rpm range.
some more reading
http://vincihighperformance.com/LS1%...SA%20EXPLAINEDCold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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07-27-2007, 04:20 PM #3
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07-27-2007, 04:21 PM #4
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07-27-2007, 04:23 PM #5the tire size, combined with the final drive ratio, will determine the engine speed required. For instance, a vehicle with a final drive of 3.42:1 and a tire diameter of 26” will only see about 5400 – 5600 RPM through the lights in high gear in a quarter mile run. Selecting a cam that will make maximum power in the 2500 – 5600 RPM range will provide the best ET.
m6 btw
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07-28-2007, 03:57 PM #6
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07-30-2007, 12:04 PM #7
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You want to cross the traps right before your shift point in 4th gear.
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