this is a bit of an obscure question that i've been thinking about for a long time.
For an all out race motor after maximum power out of a small block, what is the optimum stroke?
We all know that increasing the stroke increases capacity of the engine and the torque exerted on the crank by the piston (T = Fr). Both of these factors increase torque. Increasing stroke with a given deck height also increases the rod angle which creates increased sidewall pressure (friction) and increases stress. Increasing stroke also increases acceleration of piston at a given rpm which means more torque is neaded to drive it (F = ma).
What is the general opinion on the optimum stroke, i'm pretty sure you can't squeeze as much power out of a 289 (no matter how high you rev it) as a 351. Do you get to a point where you have too much stroke in a given block? For instance can you get as much all out power out of a 420 as a 351 or 393?
I'm talking about hypothetical race motors where the power band doesn't matter because transmission and diff ratios can be tailored to suit. I know it doesn't have much to do with real life but i'm just wondering...
For an all out race motor after maximum power out of a small block, what is the optimum stroke?
We all know that increasing the stroke increases capacity of the engine and the torque exerted on the crank by the piston (T = Fr). Both of these factors increase torque. Increasing stroke with a given deck height also increases the rod angle which creates increased sidewall pressure (friction) and increases stress. Increasing stroke also increases acceleration of piston at a given rpm which means more torque is neaded to drive it (F = ma).
What is the general opinion on the optimum stroke, i'm pretty sure you can't squeeze as much power out of a 289 (no matter how high you rev it) as a 351. Do you get to a point where you have too much stroke in a given block? For instance can you get as much all out power out of a 420 as a 351 or 393?
I'm talking about hypothetical race motors where the power band doesn't matter because transmission and diff ratios can be tailored to suit. I know it doesn't have much to do with real life but i'm just wondering...