Engine techs?

[StrtRac3r]

So it's not for my Busa, but I am considering a rebuild on my jeep. I've rebuilt motors (only a couple) but only like stock spec. In my jeep I wouldn't mind a lil extra power. So to the questions. Does anyone know....

Is 8.8-1to 9.1-1 considered a "big" compression bump?

Which would be easier to pass through smog, higher comp or a stroker motor... Or both?

What would you do?

Vehicle is obd I 93 jeep xj with the 4.0

The high comp kit keeps it at 4.0 but goes 8.8 to 9.1

The stroker kit can be close to 8.8 but a 4.7 liter kit

The both kit is a 4.7L and 9.1-1

 

[wiesjon]

I'm no expert, but I would think a stroker motor would have higher emissions, just because of higher displacement. And I don't think 8.8 to 9.1 is that much of a bump in compression. Either one is bound to generate more power and both even more. We in Kansas don't have to pass emissions checks. Guess you would have to get a baseline from and exhaust gas analyzer and see how each affects the emissions.

 

[StrtRac3r]

I'm no expert, but I would think a stroker motor would have higher emissions, just because of higher displacement. And I don't think 8.8 to 9.1 is that much of a bump in compression. Either one is bound to generate more power and both even more. We in Kansas don't have to pass emissions checks. Guess you would have to get a baseline from and exhaust gas analyzer and see how each affects the emissions.

Yeah that's basically all I know at the moment too. But I do know the higher compression will raise combustion chamber temps, increasing nox. Just an expensive way to find out lol. 1400 or so either way I go. (Just parts)