I'm setting up my new engine and want to know how to set the cam. I had it a 0 degree advance before and was lacking low end torque. I am thinking of a 2 degree advance (?) to try and improve the launch. Is this the right direction? Should I go to 4 degrees?

Cam Specs are:

                        Int     Exh 

adv duration     274     274

Lift @ .50          226    226

lift @ lobe         .296   .296

lift @ Valve       .456    .456

centerline 110 degrees at TDC

I intend to order another cam for my next engine but will run this one for now in my McCullouch blown 272. Any suggestions? Chuck in NH

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Chuck:

A 272 with that much cam isn't going to have much off the line torque, no matter what you do.  However, advancing the cam is the right direction for what you are trying to do.  A little extra valve clearance will also help.

John

John - "The Hoosier Hurricane"

Did you build the motor with fairly low compression for the blower?   The cam is streetable, but your cubes are way down, combined with low compression, and the mild cam it is going to be soft on  the bottom end   A centrifigal blower does not make any power until the rpm goes up either.

If you are going to the effort to advance the cam, you may consider more like +4 as you may not be able to tell a difference with +2.

I use a lot of initial timing, 18-20 deg, and limit the total advance 32-34 so that some of the low end is regained, yet it is not too much timing when the boost comes in. I also have a MSD BTM that knocks some timing out when the boost comes as well.

 A larger crank pulley, or smaller blower pulley, would bring the boost in earlier and help too.

Pat Fleischman

The 272 is 40 over and decked and balanced with ECZ-G heads. I have a 4" and a 5" pulley for the McCullouch so I have a little boost adjustment. The 4" puts out 6-8lbs of boost with the improved impeller. The last engine was a 40 over 292 with the same set up and cam. It had no torque at low end. Wouldn't break the tires loose for anything (except maybe wet pavement). I've got a big 292 block coming in the fall (3.875 bore) and will probably build it this winter. Just want the little 272 to scream until then. Is there a better cam for this setup?Chuck in NH

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Chuck:

The best help you can give that 272 is a higher stall speed converter.

John

John - "The Hoosier Hurricane"

I'll be putting in an AOD with a 3000 stall converter this time. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Just for clarification on the timing advance I've attached a sketch of a crank gear, actual dot locations may not be correct. If I want to advance the cam by 2 degrees am I correct to move the crank pulley from the stamped dot to the 2 degree adv location (imaginary dot in red) and also relocate the timing chain to the 2 degree adv tooth (imaginary dot in red). Thanks, Chuck in NH

http://3eagles.hypermart.net/images/Timing.jpg

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Chuck, you got it.  I had lost my instructions when I degreed mine.  Couldn't figure it out.  Had to call Mummert.  Is this one of the repro blower cams he offered several years ago?  The specs are curiously similar to mine.


Lawrenceville, GA

It is one of his blower cams. I just couldn't get used to the idea of missing the timing to get it set right. We'll see how this one runs. Chuck in NH

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Ditto on the four degrees of advance.  Two degrees typically doesn’t show a step change in performance unless the camshaft is already borderline in being too big.  I’m assuming the camshaft was originally degreed in?  If not, then it’s a stab in the dark on the advance as you don’t have a baseline to really base it on.  A compression ratio check before and after the cam advance change will also validate the change by showing you an increase in cranking compression but if this is being done on an engine stand, then 'never mind'.  And John is right as usual in that a higher stall converter will undoubtedly be the best bang for the buck in this case.

Lorena, Texas (South of Waco)