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valve overlap questions/discussion

This is a discussion on valve overlap questions/discussion within the Internal Engine forums, part of the LSx Technical Help Section category; i still cant quite wrap my head around all aspects of the centers a cam is ground on. if you ...

  1. #1
    no more 4th gen secondgearscratch's Avatar
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    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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    Senior Member mrr23's Avatar
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    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%20EXPLAINED

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by mrr23 View Post
    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%20EXPLAINED
    this is what i was looking for. thanks alot.

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    Senior Member mrr23's Avatar
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    anytime

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    no more 4th gen secondgearscratch's Avatar
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    the 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.
    was wondering how you can calculate all this? i am looking to go with the tr224 and i want to do gears with it and the right size tires too, among other things. how exactly do you dictate what rpm youll cross the traps in?

    m6 btw

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    Senior Member mrr23's Avatar
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    not sure

  7. #7
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    You want to cross the traps right before your shift point in 4th gear.

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