Thread: Machining RM Double Roller?

yes that keyway chamfer should be 1/32nd past the tits of the keyways, and the recess'd pocket must be squared.
o
n the sets ive measured that recess is the correct ID at 1.810/812 but the ****ers use too large of a nose radius cutting tool so the corner must be squared or you need to spend an hour with a file radiusing the crank shoulder to match...

the cam gear is only ground and deburred. if you do not change the pocket depth, ive found the zzp/comp cams like between .022-.028 and the intense/cam motions tend to be a hair more at .024-.030 depending on yer production tollerances....even if you guess at .025 at most youll have 6 thou chain/sprocket misalignment...far better than the 14-28 thou ive seen with un modified sets...

ive been testing for years but i have two motors with dbl rollers...properly machined...with an un ground pump cover...and just 1 OEM timing cover gasket and i still have .020" pin clearance at the pump cover....with the chain slid all the way over towards it

now dont that sound like the way something should be assembled? lol

sure slapping it on works....its far from ideal but it works....i just think that a few extra dollars of machine work and a few more hours of time is well worth it with a 200$ insanely critical engine part...

regards, James

Originally Posted by Turbocharged400sbc

yes that keyway chamfer should be 1/32nd past the tits of the keyways, and the recess'd pocket must be squared.
o
n the sets ive measured that recess is the correct ID at 1.810/812 but the ****ers use too large of a nose radius cutting tool so the corner must be squared or you need to spend an hour with a file radiusing the crank shoulder to match...

the cam gear is only ground and deburred. if you do not change the pocket depth, ive found the zzp/comp cams like between .022-.028 and the intense/cam motions tend to be a hair more at .024-.030 depending on yer production tollerances....even if you guess at .025 at most youll have 6 thou chain/sprocket misalignment...far better than the 14-28 thou ive seen with un modified sets...

ive been testing for years but i have two motors with dbl rollers...properly machined...with an un ground pump cover...and just 1 OEM timing cover gasket and i still have .020" pin clearance at the pump cover....with the chain slid all the way over towards it

now dont that sound like the way something should be assembled? lol

sure slapping it on works....its far from ideal but it works....i just think that a few extra dollars of machine work and a few more hours of time is well worth it with a 200$ insanely critical engine part...

regards, James

Perfect thanks James. Im going tomarrow to a very highly rep. machine shop that builds drag cars and i printed out your instructions so he should be able to figure it out. Either way when this is done ill check alignment when i do the install.
Thanks again for all your help and hardwork.

Originally Posted by johntremell

is this what I tell the machine shop to the get the double roller gear and crank gear machined properly?

Yes..plus bringing them a stocker