Bore and stroke

[syka24et]

I was speaking to the people at real nissan about their custom spec piston rod combo. The piston are overbore I think 040 over and the pin bushings are relocated to accomodate a slightly longer rod. Increasing the bore and stroke would have what affect on my powerband and peak power. Does any one think that this would be advisable. I am trying to build a street car with a occasional drag use and possibly some autoX. Will this put me at a serious disadvatage in any of those fields?? :help

[TrunkMonkey]

increasing bore and stroke is never a bad idea, but if you plan on turbocharging keep in mind that an increase in bore and/or stroke (without increasing you combustion chamber area) increases your compression ratio.

if you do decide to go with a larger displacement, make sure you use the proper piston design to get the compression ratio you want.

-demetrius

[syka24et]

thanks. But will that make the car harder to rev. And as far as my powerband goes I assume there will be more low end power from the added displacement but what about peak power. Basically I'm asking what are the pros and cons of bore and stroking

[TrunkMonkey]

thanks. But will that make the car harder to rev.

only if you increase the stroke. how high and fast an engine revs is determined mostly by how long a stroke it has. usually, the longer the stroke the shorter the rpm range and the slower it revs. the shorter the stroke, the longer the rpm range and the faster it revs.

And as far as my powerband goes I assume there will be more low end power from the added displacement but what about peak power.

as far as the KA goes, there's not much room for any increase in displacement. even boring it to it's limit won't net much. a longer stroke usually produces a stronger low end. a shorter stroke favors a better top end.

Basically I'm asking what are the pros and cons of bore and stroking

i can't think of any cons to increasing displacement. boosting is good, but boosting bigger cubes is better.

-demetrius