Displacement

[MRPopo61]

What is involved in upping the displacement of an Engine?

[Mike 94PGT]

Originally posted by MRPopo61
What is involved in upping the displacement of an Engine?

Boring and/or stroking.

Bore the cylinders to make their diameter larger.

Stroke the crank (weld material on the journals and then regrind them offset to increase the stroke.)

Displacement = Bore^2 * Stroke * NumCyls * 0.7854

(e.g. 2.5L V6: B=8.45cm, S=7.42cm, D = 8.45^2*7.42 * 6 * 0.7854 = 2496.6cc )

An increase of 1mm in the bore (stroke stock) results in a displacement of 2556cc. An increase in the stroke of 1mm (bore stock) results in a displacement of 2530cc.

Regardless of how you do it, it isn't going to be cheap.

[MRPopo61]

Thanks!
I think ill skip on that, it sounds kinda complicated and expensive. I just asked because I thought it would be kinda nice to be something closer to a 2.2l than a 2.0l. especialy with the custom turbo setup im working on.

[jonm16]

What exactly would increasing the displacment by bore and stroke do to the engine in terms of performance gains? Would it help acceleration, torque, etc?

[Stingray77]

Originally posted by jonm16
What exactly would increasing the displacment by bore and stroke do to the engine in terms of performance gains? Would it help acceleration, torque, etc?

more power....