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  #46 (permalink)  
Old 12-04-2008, 08:22 AM
How fast is fast enough?
 
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The summit cam kit I already recomended, and Z28 springs to match it.

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  #47 (permalink)  
Old 12-04-2008, 09:12 AM
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Thx. U Are Wise
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  #48 (permalink)  
Old 12-04-2008, 09:22 AM
How fast is fast enough?
 
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not wise, just informed. Anyone can learn this stuff just read all you can.
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Old 12-04-2008, 09:39 AM
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I don't think they make a cam that fits your needs. A custom cam will be your best bet. cost a little more but worth it.

Isky makes an oval track cam that comes close. 264/264, 224/224, 107 lsa, 2000 to 6200 rpm. the cam comes in 0.420, 0.450, or .470 lift (i believe).

I would call comp and get a custom cam. 260/268 with 106 lsa and 0.450" lift.
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Old 12-04-2008, 09:48 AM
How fast is fast enough?
 
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That cam is a single pattern with more intake duration than the one I recomended... meaning he'll loose torque and milage. Compare the .050" numbers for EVO from the summit cam and the Isky.
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Old 12-04-2008, 10:02 AM
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Im Going With Ap Recommendation. Summit 262 With Z28 Springs.
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Old 12-04-2008, 10:44 AM
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I predict that summit cam will have a fairly smooth idle. 112 lsa is the problem as it will smooth out the idle.

plus the 272 advertise duration and 112 lsa will lose more low speed torque as compared to a 264 degree cam with 107 lsa, since the 264/107 cam will close the intake valve much earlier.
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Old 12-04-2008, 10:58 AM
How fast is fast enough?
 
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That is not exactly the whole picture. The adv. numbers on the intake are larger, BUT the .050" are smaller, and the ADV numbers aren't as exact as the .050" value.

I agree a tighter LSA- something like 110 would be preferable, but 112 wil be just fine and again is budget friendly.
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Old 12-04-2008, 11:07 AM
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yes, that summit cam has very slow ramps which makes it even more of a torque killer.

need to use ZDDP oil additive to kept the lobes happy.
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  #55 (permalink)  
Old 12-04-2008, 11:09 AM
How fast is fast enough?
 
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actually it makes it more durable. And with the slow ramps you could probably get away without running ZDDP after break in. Half of the reason that cams fail more is because the ramps are getting more agressive.
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Old 12-04-2008, 11:14 AM
How fast is fast enough?
 
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I tell ya what, If you don't like that cam American Muscle, I'll buy it from you. That's how confident I am that it will get the job done right and on the first try.
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Old 12-04-2008, 11:18 AM
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yes, Sad but true. slow ramps are less likely to fail.

but would not use anything more than 108 lsa if wanting a lopey idle in a low compression engine.
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Old 12-04-2008, 11:41 AM
How fast is fast enough?
 
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Low compression doesn't help, but he doesn't want to swap to the 305 heads I was recomending. As far as LSA goes, the number itself is relatively useless. Only 4 numbers matter as far as duration is concerned- IVO, IVC, EVO, and EVC. LSA is just a measn to an end it on its own is meaningless.

A 292 cam on a 118 LSA will idle rougher than a 252 on a 108.
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Old 12-04-2008, 12:34 PM
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Believe me. I fully understand valve events.

but my point is. low compression requires short duration. And a rough idle needs overlap. hence the recommendation for a short duration cam with a narrow lsa.

btw, a 292 duration cam with 118 lsa has 56 degrees of overlap. a 252 with 108 lsa only has 36 degrees. So, of course they will not idle the same. when specing lsa and duration, that gives the timing events.

Last edited by 454C10; 12-04-2008 at 01:42 PM.
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Old 12-04-2008, 01:43 PM
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with all that being said. What cam for street use everyday
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