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Old Feb 3, 2007 | 01:58 PM
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Default 111 Lsa?

I've been looking for cams and found on that is a 228/228 .588/.588 111LSA and its a custom Comp Grind...


is 111LSA too much? Will it be REALLY choppy/lopey?
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Old Feb 3, 2007 | 02:02 PM
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very choppy/ lopey.
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Old Feb 3, 2007 | 02:22 PM
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The amount of chop is directly related to the amount of overlap. Let me give you an example. The cam you're talking about: 228/228 111LSA has 6 degrees of overlap at .050".

An MS3 cam is 237/242 114LSA and it has close to 12 degrees of overlap. Guess what? The 237/242 114 LSA has a much harder lope than the 228/228 111LSA cam. Overlap is what gives you the lope.

For what it's worth a 220/220 108LSA cam would be the smoothest idling cam of the 3. How could that be, it has a 108LSA? Because if only has 4 degrees of overlap.
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Old Feb 3, 2007 | 02:35 PM
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Originally Posted by Patrick G
The amount of chop is directly related to the amount of overlap. Let me give you an example. The cam you're talking about: 228/228 111LSA has 6 degrees of overlap at .050".

An MS3 cam is 237/242 114LSA and it has close to 12 degrees of overlap. Guess what? The 237/242 114 LSA has a much harder lope than the 228/228 111LSA cam. Overlap is what gives you the lope.

For what it's worth a 220/220 108LSA cam would be the smoothest idling cam of the 3. How could that be, it has a 108LSA? Because if only has 4 degrees of overlap.

Thanks Patrick!
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Old Feb 3, 2007 | 07:12 PM
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So 23* of overlap is gonna rattle the teeth at idle?
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Old Feb 3, 2007 | 07:19 PM
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Originally Posted by mr2guru
So 23* of overlap is gonna rattle the teeth at idle?
No, my next cam will rattle the teeth at idle
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Old Feb 3, 2007 | 09:00 PM
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Whats the formula to figure out overlap??? I searched but could not come up with anything

Lane
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Old Feb 3, 2007 | 09:02 PM
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id also like to know the formula to that one?
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Old Feb 3, 2007 | 09:49 PM
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Me too....
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Old Feb 3, 2007 | 10:04 PM
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J rod posted a valve events calculator(it's a sticky in the Adv. Tech section). It'll give you the overlap. Just plug in the duration, LSA, and ICL.
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Old Feb 4, 2007 | 12:17 PM
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ICL dosent change ovelap
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Old Feb 4, 2007 | 01:02 PM
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Originally Posted by crazylane
Whats the formula to figure out overlap??? I searched but could not come up with anything

Lane
@.050 ivo # + evc #=overlap *

Last edited by JPH; Feb 4, 2007 at 01:08 PM.
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Old Feb 4, 2007 | 03:51 PM
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intake duration+exhaust duration
divide by 4
subtract LSA
multiply by 2

the higher the valve overlap the choppier the idle
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Old Feb 4, 2007 | 08:20 PM
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So a 228/228 with a LSA of 112 would be at 4 degrees of overlape and the 111 LSA would be at 6 degrees of overlape. Would there be a diffrence in hp and tq or just the idle?
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Old Feb 4, 2007 | 08:47 PM
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Originally Posted by StreetLethal01
So a 228/228 with a LSA of 112 would be at 4 degrees of overlape and the 111 LSA would be at 6 degrees of overlape. Would there be a diffrence in hp and tq or just the idle?
The power band will be brought down with a lower LSA.
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Old Feb 4, 2007 | 08:58 PM
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that sucks im only at 10deg..i was hoping more
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Old Feb 4, 2007 | 09:06 PM
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so how do u calculate a 112+2....where do u factor in the advance that is ground in?
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Old Feb 4, 2007 | 09:11 PM
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Originally Posted by JPH
@.050 ivo # + evc #=overlap *

thank you
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