Re: How much Horsepower and Torque can a GM Forged Crank Handle
I can give you 1st hand experience from back when the 1053 Chevy forged crank was about the only thing we had.
I raced APBA Circle boats all through the ‘70’s, all three classes. In K Boat, which was more or less Unlimited on engines, we either ran an injected methanol motor with about 14 to 1 compression, or a blown motor on methanol, with about 10 pounds of boost. The engines made anywhere from 800 tp 1200 HP. We revved them to an average 7000 rpm.
I preferred the injected methanol motors, which were based on 427 tall truck blocks with 1/4 inch longer rods.
It did no good to make much more power, you set the boat up to run around 110 mph on the straight always with good excelleration out of the turns.
We used the standard 427 cross drilled nitride cranks, which could be bought from Richardson Chevrolet for $150. We always had to straighten them, as they typically ran out about .007 to .009 inch. We used a radius air chisel in the throw radii.
I never saw a broke one. Even with severe connecting rod failure the cranks stayed in one piece. Granted, the power we were making seems puny by today’s standards, but when you rev a 1000 HP engine at 7000+ rpm for five laps, it is taking some punishment.
The races were typically 5 laps on a one mile course.
'67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Roller, .675 lift, 234, 244 at .050, Lemons Headers, Holley Multiport Fuel Injection, TCI 6X 6Speed Automatic, 12 bolt Posi Eaton TruTrac, 3:31 Richmond Gears, front and rear power disc brakes, Global West Suspension, etc.
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