GN boats in action......

[FormulaZR]

Yep. Cylinder pressures are stupid. Specially when you consider a roots goes to full boost on the hit, regardless the RPM. So coming off a corner in one is hell on the lower end. Even at Puddingstone where Bill never lifts, in the corners the engine is pulled down about 2000 RPM by the boat being deeper in the water plus the rudder blocking the prop. Full load at 5000 thru the whole corner just torments the crank and rods. That is the only place we ever tore the snout off the crank.

I guess I have lot of questions about the engines...how do you control detonation? I mean, all I can think of is backing the timing down or run pig rich....but if you did, you'd never crest the 1k hp mark. Very high octane?