power range differences
03-20-2012, 07:39 PM
#1
Le Mans Master
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Location: Oxford MA-----You just lost the game!!!!
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power range differences
Can anybody explain why these two camshafts (which I believe are the exact same camshaft) have such a different advertised power range? One says 2000-4500 (2500 rpm spread, center of power range 3250 rpm), the other says 1600-5200 (3600 rpm spread, center of power range 3400 rpm).
http://www.summitracing.com/parts/SUM-1103/
http://www.jegs.com/i/JEGS-Performan...18#moreDetails
This camshaft, which I also believe is the exact same camshaft, gives the same specs as Summit does, except the advertised duration is 288/298.
http://www.northernautoparts.com/Pro...ctModelId=2283
What the heck is going on here? How am I supposed to trust any of these numbers? Thanks for any help,
Keep the shiny side up!
Scott
http://www.summitracing.com/parts/SUM-1103/
http://www.jegs.com/i/JEGS-Performan...18#moreDetails
This camshaft, which I also believe is the exact same camshaft, gives the same specs as Summit does, except the advertised duration is 288/298.
http://www.northernautoparts.com/Pro...ctModelId=2283
What the heck is going on here? How am I supposed to trust any of these numbers? Thanks for any help,
Keep the shiny side up!
Scott
03-20-2012, 07:52 PM
#2
Race Director
"Power range" is one of those specs that has no real definition so everyone has their own interpretation. At best it gives you an idea of the intended usage.
Duration @050 is a much better gauge of how it will run in your motor.
As for the difference in advertised duration, that one isn't well defined either. Some measure lift from 0.004", some from 0.006". Again, a fairly useless spec.
As for the cam itself, I ran one years ago in a 350 SBC. With $100 headers, dual plane intake, 600 CFM Holley and pocket ported factory heads it made 240 rear wheel hp on a mustang dyno through an automatic (probably about 300 flywheel). I was very pleased with the cam, excellent driveability and throttle response.
Duration @050 is a much better gauge of how it will run in your motor.
As for the difference in advertised duration, that one isn't well defined either. Some measure lift from 0.004", some from 0.006". Again, a fairly useless spec.
As for the cam itself, I ran one years ago in a 350 SBC. With $100 headers, dual plane intake, 600 CFM Holley and pocket ported factory heads it made 240 rear wheel hp on a mustang dyno through an automatic (probably about 300 flywheel). I was very pleased with the cam, excellent driveability and throttle response.
03-20-2012, 09:29 PM
#3
Le Mans Master
Thread Starter
Member Since: Mar 2008
Location: Oxford MA-----You just lost the game!!!!
Posts: 5,948
Likes: 0
Received 62 Likes
on
52 Posts
"Power range" is one of those specs that has no real definition so everyone has their own interpretation. At best it gives you an idea of the intended usage.
Duration @050 is a much better gauge of how it will run in your motor.
As for the difference in advertised duration, that one isn't well defined either. Some measure lift from 0.004", some from 0.006". Again, a fairly useless spec.
As for the cam itself, I ran one years ago in a 350 SBC. With $100 headers, dual plane intake, 600 CFM Holley and pocket ported factory heads it made 240 rear wheel hp on a mustang dyno through an automatic (probably about 300 flywheel). I was very pleased with the cam, excellent driveability and throttle response.
Duration @050 is a much better gauge of how it will run in your motor.
As for the difference in advertised duration, that one isn't well defined either. Some measure lift from 0.004", some from 0.006". Again, a fairly useless spec.
As for the cam itself, I ran one years ago in a 350 SBC. With $100 headers, dual plane intake, 600 CFM Holley and pocket ported factory heads it made 240 rear wheel hp on a mustang dyno through an automatic (probably about 300 flywheel). I was very pleased with the cam, excellent driveability and throttle response.
Keep the shiny side up!
Scott