Given the following:

Web cams has....287 deg. lift .425
Team-Pami Race 1's..........276 deg. lift .425

Team-Pami's other cams
Sport cam - cast - 270 degree duration - .405 lift
race cam 1 - cast - 276 degree duration - .425 lift
race cam 2 - cast - 282 degree duration - .433 lift
race cam 3 - steel- 284 degree duration - .464 lift
race cam 4 - steel- 290 degree duration - .488 lift

What will each cam give me?

How do I know which has more low end power and which one has more top end power?

I am putting a 11.2:1 piston, porting & intake matching, 45mm carb and cams in. I will be running pump gas.

I ride at Sand Mt. Nevada and enjoy shooting the hills as well as trail riding.

Which will get me up the hill faster than stock without killing my bottom end for the trails?

Is there any coorelation between lift/duration and bottom end / top end power?

Any other mods you would suggest?

Oh, I will also be putting in heavy duty clutch springs and changing the gearing.

 

Generally as the duration increases you will lose some low end. There will be some overlap between the time the exhaust valve closes and the intake valve opens. This will cause some cylinder pressure to bleed of at lower rpms which translates into less low end power. On the upside you will see better scavenging and better cylinder fill as the rpms go up. This means more dynamic compression and better top end power. Usually drag racers will simply step up on the gear ratio to get the motor into the powerband quicker and take advantage of the top end power. It is expected that most engine mods will shift the power to the right on a dyno sheet. Usually power won't drop off as fast after it peaks too. There is more to how a cam will affect power than simply lift and duration #'s. Centerline and lobe profile can vary quite a bit even though they have the same specs on a sheet thats where custom cam grinders find their bread and butter. Also, a higher compression piston will work well with higher duration cams.

 

All I know is that I ENJOYED my sport cams more than these race cams.

I mean I now have to ride almost like a 2 stroke. Sand 45 will also verify this.

 

Al, what exactly did you enjoy? Hill shooting more or trail riding more?

AngryBajaBoy, What cams are you using?

 

What I mean by enjoying is that I didn't have to "work" to constantly get the RPM's in the proper range because you DO lose some of your bottom end.

People will say "then you need to change your gearing". Great for the hill but then I lose some of that top end speed when I'm dunning/desert riding.

I don't want to keep changing sprockets every time the type of riding I'm doing changes. That's why I liked the "all around cams better", but I am learning to ride with these race cams.

 

Web also makes a .395"/287deg. all around cam.