So i'm looking to buy a sleeved block in the coming weeks and can't decide whether to go with a sleeved b16 or sleeved b18.

The one advantage I see the b16 having is the better rod stroke ratio but even at 84mm your not getting the same capacity as the b18 with stock size pistons.

Which one would you go for and why?

 

Don't worry about the rod stroke ratio as much. There are more displacement options with the B18C over the B16A2. You can keep the same stroke or add an LS / B20 crank to the mix. The rod stroke is just an optimal theoretical number. That's it.

 

Yes that is true and I guess having bigger displacement will help produce power easier and reduce turbo lag

 

I think the rod stroke ration means nothing! Yes the smaller stroke engine can rev higher but who cares. It's power and torque that matters. The bigger engine/ longer stroke will always make a lot more power and it will do it at lower revs.

I have a stock 2.0 s2000. And all the big hp all motor guys are run f20"s stroked to 2.4-2.8litters.

The more power the better and the lower the rpm the better

B18=more power and lower rpm, therefore b18>b16.

If my f20c was stroked to a 2.4 It would rev to 7,500-8,000 insteed of 9,000rpm. Insteed of making 442whp on 91 octane it would make close to 500whp and at least +100 more tq.

 

Ok so sleeved b18 looks the way to go. I'm thinking of going with Benson sleeves. Generally what is it safe to spin a gsr motor to? 9000rpm safe enough?

 

That has a lot to do with Valvetrain/Cams. But yes 9k is nothing to rev a GSR to. I rev mine to 9200 everyday. Possibly even to 9500 once we get it back on the dyno and see how long it holds power.

A good rule of thumb is you rev until you stop making power. Atleast thats what we do.