Thumpr cam

[Bums F-1]

I see Comp Cams is making a Thumpr cam for our flatheads, anyone have any experience with this one yet ?

 

[flatjack9]

If I remember right, it looks like they run a tight lobe center to give it the "thump", but this also kills low end torque. Need a long stroke and lots of compression to compensate, but then why bother.

 

[34fivewindow]

They are ground on an 106 lobe center, this is what gives this cam the sound....Ed

 

[Ol' Ron]

Anybody got the timing numbers??

 

[NDFlathead]

I copied this from Speedy's latest catalog.

 

[HotRodmicky]

They cam seems to have 30° adv duration(or 15° at 0.050) more on the exhaust .

If that makes sense?????

I don't think so...


Maybe Pete can comment that cam design....

 

[Charlie ny]

Bum,
What Jack said....been there. My bone stock '35 sedan walks my '41 1/2 ton
with an 8ba , 3/4 cam etc going up hills and away from lights....for the the first
6 car lengths. On the freeway or in open country of course the '41 creams the '35.
Charlie ny