s2kvince

I'm preparing to dyno my S2000 with a 3" pulley on a NOVI1000 and it sounds like belt slippage is going to be an issue. In an attempt to avert possible issues on the dyno, I'm thinking about cutting grooves into the pulley ahead of time. Does anyone have photos of exactly how this needs to be done to improve belt grip?

s2000Junky

There is really only one way to do it I found, cut laterally across the grooves, and deep enough to be effective with the right size Dremel cutting wheel. I did a cut about every 1" or so spacing if I recall. But I don't think there is any set rule here, this is a custom job. Do what you think will work best.

jdmz

I may do it to my 3.2" if it starts slipping. I am trying the new Gates RPM belt to see if it helps.

Kyle

s2000Junky

Richard racing pulleys are a bit more elaborate then simple cross cut groves, they are actually semi hollow pullies, where material is machined out of them and the cuts on top actually show light through them from underneath. This not only makes them lighter pullies, but I wonder if this has an impact on performance, relieving positive pressure aiding in the belt grip. Not sure if that's just my theory or actual intent. Either way, cross cutting some make shift groves on a standard pulley is likely worth doing.

rrounds

You could do something like this to your pulley.
https://www.dragzine.com/tech-storie...rip-carbinite/
And here is the Co. that does this
High Friction Metal Coatings - Improving Machining Clamping Force | Carbinite Metal Coatings

This is not new technology(it works) but I have not seen anyone on here talk about it.

Rod

AP1Chief

I cut grooves, plus, I used the autozone dayco belts, they seemed to no stretch as much as the "better belts" and wouldn't slip after a few heat cycles and cranking down on the tensioner.

s2000Junky

Bad idea, all it does is sand down your belt, and if you still have any amount of slip, plan on the belt breaking in no time. You dont want a sand paper surface on a rubber belt.

You will always have some amount of belt slip by design unless its a cogged system, and those have their own set of issues, like breaking things.

hecash

I've been running a 3.2" pulley for years without any slippage. I may have to replace the bearings soon but I found that 125 lbls of belt tension was all that it took to make it work.

S2K-F8

OG right here