Comp cam advice
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
Comp cam advice
Hi all,
I's buying a new cam for my 350 soon and need some advice on the below results.
Looking at the dyno sheets of the Comp cams its interesting that the smaller cam of the 2 with exactly the same set up produced more power and torque.
Camshaft XE262H-10
HP-348HP @ 5300rpm with 415 ft lbs @ 3700rpm of torque
http://www.compcams.com/v002/Pages/387/XE262H-10.aspx
Camshaft XE268H-10
HP-342HP @ 5000rpm with 413 ft lbs @ 3800rpm of torque
http://www.compcams.com/v002/Pages/388/XE268H-10.aspx
My engine will not have as much work done to it as in the dyno results above. This has Dart alloy heads and I'm sticking with my original cast no.3998993 heads.
Could anyone explain why the smaller cam is performing better?
I's buying a new cam for my 350 soon and need some advice on the below results.
Looking at the dyno sheets of the Comp cams its interesting that the smaller cam of the 2 with exactly the same set up produced more power and torque.
Camshaft XE262H-10
HP-348HP @ 5300rpm with 415 ft lbs @ 3700rpm of torque
http://www.compcams.com/v002/Pages/387/XE262H-10.aspx
Camshaft XE268H-10
HP-342HP @ 5000rpm with 413 ft lbs @ 3800rpm of torque
http://www.compcams.com/v002/Pages/388/XE268H-10.aspx
My engine will not have as much work done to it as in the dyno results above. This has Dart alloy heads and I'm sticking with my original cast no.3998993 heads.
Could anyone explain why the smaller cam is performing better?
Last edited by Corvetteoz; Jan 12, 2017 at 12:47 AM.
Burning Brakes
Joined: Jan 2017
Posts: 1,095
Likes: 213
From: The Buckle of the Bible Belt. Joplin Mo
I am sure there are members on this site that have more experience with cams than I have but I will take a shot. I think the clue is that both set ups are identical and using a vacuum secondary carb. The bigger the cam the less vacuum you have at the manifold. If the examples used a mechanical secondary carb I think the bigger cam would make more power and the outcome would have been different. At any rate hardly noticeable at the rear tires.
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
I am sure there are members on this site that have more experience with cams than I have but I will take a shot. I think the clue is that both set ups are identical and using a vacuum secondary carb. The bigger the cam the less vacuum you have at the manifold. If the examples used a mechanical secondary carb I think the bigger cam would make more power and the outcome would have been different. At any rate hardly noticeable at the rear tires.
I would be interested in more opinions on this matter but your explanation Gold Dragon does make sense.
