Cam spec knowledgeable, queston for you... - Team Camaro Tech
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post #1 of 2 (permalink) Old Mar 30th, 08, 06:24 PM Thread Starter
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John
 
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Join Date: Aug 2007
Location: Chandler, AZ
Posts: 1,167
Question Cam spec knowledgeable, queston for you...

Been studying up for my planned big block build, and want to get a pretty bumpy cam, using 10.5 static comp ratio, +/_ .
I can't find a little info on something I've been interested in.

The question is on the intake closing point, what is the approx range to where it'll bleed off some low rpm compression to avoid pinging? (it's hot here in Vegas) I don't want to rattle the thing.
I know the overlap and sep angle will have limited amount in it, but have read in a couple of places where the intake lobe closing later will help with avoiding pinging on the street, is it a big difference? Or is it just the wrong cam for application?

What would be the numbers to look for on specs for bleeding a little low speed off if I'm pushing the limits on static comp ratio for street?

Or is it a non issue if the duration is on the longish side?

My build would be:
540ci, std deck height
10.5 static comp ratio, no Nitrous, no blower, etc.
forged internals
Alum heads
RPM range to 6000 +/- maybe 6500 max.
Must be pump gas 91 octane slop.
I'd like to have 600 h.p. at flywheel, which I feel for the h.p/c.i. ratio is realistic with pump gas, but I don't know for sure.

Any thoughts? I'd like to hear them.

- John
Misfit tortured soul. Lone wolf. Unicorn.
'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y
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post #2 of 2 (permalink) Old Mar 31st, 08, 04:50 PM
 
Join Date: Apr 2000
Posts: 21,341
Smile Re: Cam spec knowledgeable, queston for you...

Use this for SCR calculations..

http://www.campbellenterprises.com/R...alculators.htm

And then this one for DCR calculations..

http://www.rbracing-rsr.com/comprAdvHD.htm

and try to match the DCR to around 7.75 to 8.0 to 1 for iron heads and pump gas, BUT DCR can be fudged upwards some if your engine combination is right-on! Aluminum heads, tight quench, cam timing, etc., etc....

And please read Pat Kelley's GREAT DCR site here..

http://cochise.uia.net/pkelley2/DynamicCR.html

and read it at LEAST three time's!!

And I did!!

Hope this all help's you get a handle on this topic.

pdq67



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