I am wrapping up the build of a 212 Predator “open” engine and am looking for guidance on the selection & purchase of two key components and an “overview” of the aftermarket parts I have already purchased. I have built & raced Tecumseh Star motors for the past five years but that kart count is dwindling so I want to switch to the “open” OHV class for the remainder of the 2014 schedule.
The track is a 1/6 mile flat dirt oval (Southern Gap Raceway, Grundy VA) I race 400 lb. senior class with a fully adjustable Cobra chassis on Burris slicks (pink & blue). I would like to limit my max RPM to around 6500, with a power band between 4500 & 6000 rpm. Here’s what I have assembled to date.
Stock “deburred” 212 Predator Block
6236 ARC Billet Rod, HF Predator 3.595" X .490" (stock length)
11132P94 Wiseco Piston 2.756" X .640 (stock bore)
6521 ARC New "Short" Heavy Duty Wrist Pin
ARCDJ-1116P Cylinder Head for Predator - HI COMP 18cc
Raceseng VTK3 RSP-13-852 Valve Train Kit /w Adjust Push Rods/ Rev3 Roller Rockers
NR Racing 27mm & 25mm Stainless Valves
Competition Carbs 330 Taltson w/ billet intake
Raceseng Adjustable Timing Kit RSP16-063
Raceseng Billet Lifters RSP 13-350
Raceseng Billet Finned Flywheel
ARC Billet Side cover
NR Racing RTV Header
Bully 2 Disc 6 Spring Clutch
Here are my questions:
Does anyone see any mismatch / conflict / shortfall with the combination of components listed above?
Using the parameters listed (track size, max RPM, Weight class) what is the best brand & size cam to buy?
Given the cost of an aftermarket steel crankshaft ($400 - $500) is the stock crank sufficient for the 6500 rpm load? I know that is a loaded question, any internal parts issue will ultimately trash the crank. I accept the risk/reward for a catastrophic failure of any aftermarket piece….as long as it isn’t an inherent weak link…i.e. a stock crank.
Thanks for any input…The next race is Aug 19
The track is a 1/6 mile flat dirt oval (Southern Gap Raceway, Grundy VA) I race 400 lb. senior class with a fully adjustable Cobra chassis on Burris slicks (pink & blue). I would like to limit my max RPM to around 6500, with a power band between 4500 & 6000 rpm. Here’s what I have assembled to date.
Stock “deburred” 212 Predator Block
6236 ARC Billet Rod, HF Predator 3.595" X .490" (stock length)
11132P94 Wiseco Piston 2.756" X .640 (stock bore)
6521 ARC New "Short" Heavy Duty Wrist Pin
ARCDJ-1116P Cylinder Head for Predator - HI COMP 18cc
Raceseng VTK3 RSP-13-852 Valve Train Kit /w Adjust Push Rods/ Rev3 Roller Rockers
NR Racing 27mm & 25mm Stainless Valves
Competition Carbs 330 Taltson w/ billet intake
Raceseng Adjustable Timing Kit RSP16-063
Raceseng Billet Lifters RSP 13-350
Raceseng Billet Finned Flywheel
ARC Billet Side cover
NR Racing RTV Header
Bully 2 Disc 6 Spring Clutch
Here are my questions:
Does anyone see any mismatch / conflict / shortfall with the combination of components listed above?
Using the parameters listed (track size, max RPM, Weight class) what is the best brand & size cam to buy?
Given the cost of an aftermarket steel crankshaft ($400 - $500) is the stock crank sufficient for the 6500 rpm load? I know that is a loaded question, any internal parts issue will ultimately trash the crank. I accept the risk/reward for a catastrophic failure of any aftermarket piece….as long as it isn’t an inherent weak link…i.e. a stock crank.
Thanks for any input…The next race is Aug 19