Sound familiar?Īll of the Pro Stock Snowmobile racers take their racing seriously, and spend a pile of time and money to build and tune these machines. It's a delicate dance to grab ahold of the drive belt and efficiently transfer power down to the track, without blowing the track away at the hit, or having it get loose and blow the track off farther down the 1320. MSD ignition progamming is also key, to adjust when and where the power hits and how hard. The two stroke engines can be extremely finicky to tune, and are very touchy to jetting and air density. I can tell you that there was a glitch with the data computer on Todd's sled after the first round, and he went back to some old-school tuning by feel to get the sled to launch and leave cleanly in the final. Tuning the clutch system is tricky, and that's where most of the magic happens that separate winners and also-rans.Īll of the top teams run some serious data management computers, and will go over the graphs and numbers religously after every run. The primary clutch is a centrifugal type very similar in principal to what the fuel cars run, constructed of billet and using a combination of springs and flyweights to apply pressure and shift the power back thru a rubber belt to a torque converter, then a jackshaft which drives a chain to spin the drive axle and track. They run a 10.5 inch wide Camoplast track specifically made for the application.Īll Pro Stock sleds must run a CVRT belt type transmission. Most of the top competitive sleds in the Pro Stock class run a tube chassis or a billet tunnel/chassis, and a rear skidframe from either Pro Stock Inc or Proline Performance. The sled/driver combo has to weigh in at 650 lbs. Most teams will admit to horsepower in the 270-280 range. The engine bottom end must start as an OEM piece, and the "skin" must match the engine brand. The engines can be no larger than 1000 c.c.'s, naturally aspirated on legal race gas. The rules are pretty basic, and very similar to Pro Stock cars. ![]() ![]() I was fortunate to be crewing for Todd Serra's winning Pro Stock Snowmobile at Brainerd, and I can assure you that although they might be a novelty to most NHRA drag racing fans, these sleds are pretty sophisticated pieces of drag racing machinery.
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