would type-s pistons be worth getting.... - Honda Prelude Forum

4bidden · 03-21-2002, 11:07 PM

I'm about to do my H22 swap into my 92 Si and was wondering if the Type-S pistons would be worth purchasing. I've found them for $380 w/ rings. Later I plan on putting in some Skunk2 stage II cams and their springs/retainers and was just planning ahead because I know higher compression will make a bigger difference with some cams that breathe better. So do you think an extra $380 now would be worth it? And if you have any place you know that sells them cheaper than $380 new than let me know also. Thanks!

silvia · 03-21-2002, 11:41 PM

11:1 compression. You will need at least 95 octanes to take full advantage of the rise in compression. Is you engine jdm if so I wouldn't do it you will have 10.6:1 ratio. An increase of 1 is about 2-3 percent in horse power providing you run a high octane.

4bidden · 03-21-2002, 11:49 PM

when you say "providing you run high octane", what do you mean by that? octane is octane as long as you dont detonate. thats why putting unleaded race fuel in a stock car is useless.

silvia · 03-22-2002, 12:00 AM

You cant run a 11:1 engine on 92, you will detonate. In order to compensate you will have to retard the timing which will result in a lose of power. It will defeat any benefits the raise of compression provided.

4bidden · 03-22-2002, 12:01 AM

you really think i'd detonate on 92 octane with 11:1? i dont think i would, even with stock timing

speedrcr93 · 03-22-2002, 04:49 AM

Quote:

Originally posted by silvia
You cant run a 11:1 engine on 92, you will detonate.

s2000's have a cr of 11.0:1... they run just fine on 91 octane fuel...

bgod · 03-22-2002, 07:09 AM

you'll be fine with 11:1 compression and 92 octane. seen it done plenty of time with b series motors.

what motor do you have, jdm/usdm? if you have the jdm, it's useless for a slight bump in compression. might as well just add a thinner head gasket.

also, it's not just $380. if it was that easy. the head needs to be pulled and the block needs to be honed.