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Coyote Series Engines
Mustang cams - piston to valve clearance
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<blockquote data-quote="hasty" data-source="post: 12679635" data-attributes="member: 145830"><p>I question weather there will be substantial power gains by playing with the cam phasing a lot vs. what has been working for a GT/Boss with headers and off road exhaust.</p><p></p><p>I know this isn't necessarily true, but I'm thinking that whatever has been working with regard to the intake camshaft timing on a stock GT will remain the same. There may be some exhaust scavenging effect from using headers, but if you have full exhaust I wouldn't count on it above 6000 rpm.</p><p></p><p>The CJ exhaust cam has 27* more advertised duration. If it's ground on the same centerline, that would mean 13.5* more overlap vs. stock. There's your benefit with long tubes from the scavenging effect, and additionally, from the flow numbers I've seen on a ported head, going from 11mm to 13mm lift will increase the flow number by about 4.2%.</p><p></p><p>When you factor stock head & ex. cam vs. ported head & CJ ex. cam the percentage of CFM increase through the exhaust port is 17.2%, so there's no doubt about power being found in these mods if the exhaust system isn't a major restriction (running stock manifolds and converters)</p><p></p><p>I am going to go out on a limb and say that there will be a few horsepower to be found by some extensive testing on the camshafts, but whatever cam phasing has worked for a stock Boss or GT with headers/ off road mid-pipe will probably be acceptable unless you are looking for every last horsepower and have a lot of time to play on the dyno.</p><p></p><p>I'd assume with major reductions in exhaust backpressure your combo may tolerate slightly more spark advance than a stock setup.</p></blockquote><p></p>
[QUOTE="hasty, post: 12679635, member: 145830"] I question weather there will be substantial power gains by playing with the cam phasing a lot vs. what has been working for a GT/Boss with headers and off road exhaust. I know this isn't necessarily true, but I'm thinking that whatever has been working with regard to the intake camshaft timing on a stock GT will remain the same. There may be some exhaust scavenging effect from using headers, but if you have full exhaust I wouldn't count on it above 6000 rpm. The CJ exhaust cam has 27* more advertised duration. If it's ground on the same centerline, that would mean 13.5* more overlap vs. stock. There's your benefit with long tubes from the scavenging effect, and additionally, from the flow numbers I've seen on a ported head, going from 11mm to 13mm lift will increase the flow number by about 4.2%. When you factor stock head & ex. cam vs. ported head & CJ ex. cam the percentage of CFM increase through the exhaust port is 17.2%, so there's no doubt about power being found in these mods if the exhaust system isn't a major restriction (running stock manifolds and converters) I am going to go out on a limb and say that there will be a few horsepower to be found by some extensive testing on the camshafts, but whatever cam phasing has worked for a stock Boss or GT with headers/ off road mid-pipe will probably be acceptable unless you are looking for every last horsepower and have a lot of time to play on the dyno. I'd assume with major reductions in exhaust backpressure your combo may tolerate slightly more spark advance than a stock setup. [/QUOTE]
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Mustang cams - piston to valve clearance
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