i know the heads that make the most power seem to have the best mid and low lift numbers and give up some up top. so my question is. would it be better for a person using a ex gind cam to focus a little more on the higher lift numbers than the lower lift numbers, becuase the cam with the steep lobes, seems that it would spend more time in the higher lift area. i mean the valve more shoot open faster with ex grind cam, than push open slower with a cam like the 306 ( therefor less time in the .300 and .400 lift and more in the .500s and uppers .500s ) so if your your spending less time there why not focus more on this area above 500.

i am in no way a cam or head expert but just a question.

 

well....

 

well i cant answer my own question people, becuase if i could i wouldnt have to ask it.

oh yeah TTT

 

last ttt

 

Its a good question,I guess you stumped everyone. I will give my humble expert opinion. You are still going past mid lifts twice.Albeit a little faster with the extreme lobes.And peak lift once.So the mid lift flow #'s still mean a lot.

 

Not the easiest question in the world so no wonder you didn't get a answer really quick.

Basically you want to know if going from a XE cam to a Magnum cam is going to effect what you want your flow curve to look like.

So lets look at two cams.

A Magnum 224/230 and a XE 224/230

The Magnum has .533/.544 lift and 136/143 .200 duration

The XE has .536/.544 lift and 145/157 .200 duration

So the XE lobe is much faster opening and it will have more lobe area for the same lift and .050 duration.

Does this mean I should forget about the .300-.400 lift range and make sure that my .500 lift flow is awesome? No.

The reason is that the .300-.400 lift range is a difficult area to achive good flow gains, and anytime you can gain flow there in a street application it's going to help you out alot. Now if we had much higher lift cams, say .700 lift then the .300-.400 would not be as important, but if you did improve it there it would be really helpfull.

I would say that the .300-.400 flow curve is equally important with either cam.

Now the other thing here is that the valve control on the XE cams is much harder to achive, and it will not work at high RPM as well as the magnum lobes. The XE will build more TQ and the Magnum will work better above 6000. That's more of the reason to use the different lobes.

Bret

 

it was just something i was thinking about.

anybody else

thanks

i never thought of the lobe area, when i was tinking about this question.