NtPReLuDe

Are there any negitive effects when adding 89mm pistons to a stock stroke engine? I did the math after some searching and I came up with 2257cc so a 2.3L? Is that right?

NtPReLuDe

actually endyne makes some 90mm pistons and that gave me 2290, would that be any better?

Satan_SRV

90mm is too much...cylinder walls are way too thin in my opinion.

__________________
Joel
Dirty Supra Turbo Hardtop

NtPReLuDe

even for iron sleeves?

71dsp

If the iron sleeves are thick enough, you might not have enough capacity in the water jacket for proper cooling on a street driven vehicle.

One thing I always wondered is why don't the companies that make these sleeves make the outer part of the sleeve (the part that sits in the water jacket) like a heat sink? A heat sink is made to dissipate heat by adding surface area, right? Why can't the same concept be applied to iron cylinder sleeves on a Honda engine? Now, I know that sharp angles introduce stress risers so that if the heat sink is made with 90 degree cuts that could cause a crack to form, but might there be a way to machine the fins in without any sharp angles? Total surface area might suffer, but it still has to transfer more heat than no fins at all. Just an idea....

DirtyLude

People talk about the tabs that are on the GE sleeves doing this. Giving a bit more surface area. Also one thing a closed deck does, which most people don't account for is transfer heat from the cylinder to the outside block so that heat can dissapate out of the block and heat can also be absorbed by the coolant on the block side of the water passage rather than just the cylinder side. I have no idea how much this helps, though.

In other words I don't know why they don't put some kind of heat dissapating texture on the outside of the cylinder. I just like talking. I'm sure there would have to be alot of study on the type of texture or fins in order to help cooling rather than just impede the flow of the coolant and create hot spots.

__________________
DirtyLude
Mark Higgins

Toronto Prelude Club
www.hondaprelude.to

Daemione

From what I've heard, going out to a 90mm bore will give you long term head gasket sealing problems. 89mm seems to be the practical limit on a street engine.
Yeah, interesting idea - I'd never thought of that before. But I would think that better coolant flow would be more important than surface area. If it were air-cooled, fins would be more logical.

__________________
--- This message was not sent from a phone ---