Bore vs stroke increase effect on X cam?

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Bore vs stroke increase effect on X cam?

Post  J.Toney on October 13th 2018, 11:44 am

Probably too broad of a question, and I know testing is the best answer. Or maybe a thread has alredy covered this? Also understand each will require an different cam to optimize power.

But is there general input? Example is 4.420 x 4.300 528" engine. Have a given cam. Now increase the bore to 4.560 and leave all other parts equal, 562"

Versus: Increase stroke to 4.600 or X amount to create similar cubic in outcome, and leave bore @ 4.420. I assume torque will gain a good bit vs the bore increase.

How far away is the original cam getting away from being optimal for its intent using differnt methods of inch increase







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Re: Bore vs stroke increase effect on X cam?

Post  BBFTorino on October 13th 2018, 3:40 pm

Having seen this topic before, I remember a discussion about it several years ago on some other forum.
The prevailing opinion was that the increase (or decrease) of stroke has the greater affect on the combo. Because of the increase in piston speed and the greater signal it will pull through the intake tract.

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