clutch ?

Why 2-disc ?? ...is this a Puller over 500 HP ??

When you get to the point of running 8th gear, you'll need a two disc clutch. Slower than that, a single disc can be made to work just fine. Modern day pulling sleds start easy and don't require a lot of clutch slipping.

7040 wrote: thanks I will putt in new disc and see what happens

we have here a heavy duty pressure plate, and clutch disc that was holding 500hp fine. We were required to have a steel flywheel, so we got a dual disc for that reason. Now, for safety reasons, if you're willing to buy the dual disc, and planning to continue upping the performance, just buy the dual disc and be done with it. I would have a little slippage with the single disc clutch. Other than some grinding in the bellhousing for clearance, the dual disc is something I wish I'd done a long time ago. Smooth launches, and no worrying about a cast iron flywheel coming apart and killing someone. If you're staying below 10mph, then single disc heavy duty will work, but anything faster really heats the flywheel up taking off. That heat is what makes flywheels explode! Kenny's pulling parts does a nice job on AC clutches, as well as Rursch.

I cringed last night watching some modified allis tractors running big cube 6 cyl. engines turning 3000+ rpm with them old cast flywheels with the smoke rolling out of the bell housing. It's going to take someone getting hurt to get safety equipment on these classes I am afraid.

I had a place make a single disc 4 pad plate with ceramic buttons , about a 100 ft I could see the dust coming from the housing ,they said it should hold up too 800 hp , it didn't slip , but the heat build up was too much , the pp just had single springs in it - then found a used Crowler 3 disc once its locked that baby wont slip !

Dang you can do almost anything withj Orange Dr A ! I never would've thought of that spring pressure !

Atlas seems to be pretty popular