which cam
TECH Senior Member
Joined: Mar 2004
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From: BFE
Overlap is always more power.
I'd be happy to grind a cam specific for your application. Give me a call or send me a PM giving me a little more information on your car and your goals and I can help make sure you get exactly what you need. We can definitely make sure you've got the sound you want in a great blower cam barring conflicting desires (I.E if you have an auto and want to keep the stock converter).
-Jesse
-Jesse
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WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
800-456-0211 / PM / Facebook
WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
TECH Addict
Joined: Sep 2009
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From: PA/MD
I guess I didn't really think of it that way....I always just tjought of it as losing boost through too much overlap.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
At a certain level depending on the rest of your motor setup, overlap starts to bleed too much intake and usually we compensate by adding more boost.
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Joined: Jul 2010
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From: Maryland
I know you have tried to set things straight about this over and over, glad to see that you haven't given up. This generalized misconception needs to die.
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
I've built/used a couple of supercharged setup for street, every time, results are the same just adding a bit of overlap will see an increase in power.
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Verdad Gallardo TECH Addict
Joined: Sep 2009
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From: PA/MD
That is the trick. When is too much? From my experience from 7 to 10 psi around 6* positive overlap is very manageable. Valve events of cam also can help by making cam less exhaust biased from TDC.
At a certain level depending on the rest of your motor setup, overlap starts to bleed too much intake and usually we compensate by adding more boost.
At a certain level depending on the rest of your motor setup, overlap starts to bleed too much intake and usually we compensate by adding more boost.
Also, another question....when people say "shoot for 9:1 compression for boost" what kind of dcr are they going for, or I guess, if you have a high 12:1 or so scr, but a huge cam which drops the dcr down to 8.2:1, can this setup tske boost just like the lower static compression smaller csm motor?
