SJSHARKS

If the 2004 enging has been stroked, I'm still unclear on one aspect of stroking an engine.

I think I understand the lowering of the rpms, I equate it to lengthing your driver to 10 feet and then trying to swirl it around your head.

But what I don't have quite straight is how the torque is increased(assuming the pistons and head remain relative the same). I thought that to increase power in a car you had to have a bigger bang or higher compression.

The only thing I can come up with is that the increased volume in the cylinder produces a larger volume of fuel mixture therefore a bigger bang.

Is there any truth to this?

RazorV3

Stroking an engine means increasing its stroke so that the piston travels further up and down in the cylinder, thus increasing the displacement and power of an engine. By the way, the only way to stroke an engine is to change or alter the crankshaft to obtain a longer throw. If all other components remain the same, an increase of stroke will increase the compression ratio because the piston is being shoved further toward the head. Conversely, longer rods or taller pistons will increase compression ratio, but the engine's displacement will remain the same.

SJSHARKS

So you are saying that the 04 S2000 will probably have a higher compression ratio than previous versions?

Road Rage

I am not so sure about the CR thing as described - stroking produces more work per combustion cycle, so power and torque go up. The total piston travel is greater,.