2000 prelude sh

jrsc at 9psi
hondata im gasket
rc 440cc injectors
efi PMS computer w/interacq software

and either :

a) golden eagle sleeved (90mm) and decked block, o-ring'd deck
je 9:1 90mm pistons
b) golden eagle sleeved (87.5mm) and decked block, o-ring'd deck
arias 9.6:1 87.5mm pistons

would the additional $330 be worth it for some eagle con rods?

and please, no "hondata" or "turbo" or "jrsc sucks" comments. i like the blower, i just don't like the fuel management the kit came with. i know next to nothing about internals, so any insight there is appreciated. thanks in advance!


[Modified by schwett, 10:40 AM 4/10/2002]

 

do you really need a built block for a 9psi jr charger ?

 

well... i wouldn't have thought so... but my motor is showing 70+% leakage and <100psi compression. i'll know more in a few hours, but it looks bad! (and it's not cam timing.)

 

i would do the bigger bore, with the higher compression, 9psi isnt that much. JE can custom make you pistons.

 

A =
You won't like arias pistons unless your hard of hearing, they are loud. Endyn also has good 87mm or 90mm pistons for FI. Do the rods, think of it as insurance.

 

mmm that's interesting and good to know. how loud? loud at WOT are loud all the time like an old diesel?

thanks guys

 

like old diesel. Might be ok for all out race but for street car, i'd go with something more civilized.

 

OUCH. that's no good at all. are the JE pistons quiet as stock, or is any forged piston going to be loud? i was under the impression it was only until they warmed up!

 

I have the Endyn's and they tick(or slap) a little cold but once warm, its gone, same with JE's. The Arias's I've heard did it all the time, hot or cold.

 

so like 9.5:1, 90mm custom JE pistons? what about possible head gasket failure? isn't that risk increased with the larger bore?

 

Yes, but you mentioned o-ringing the deck, so it shouldn't be a problem. You might need a custom gasket, maybe cometic makes one. If your gonna sleeve it, bigger is always better. Their is no replacement for displacement.

 

You want a higher silicon content piston like SRP's. JE or Arias low silicon are a little too hard core for a 9psi setup and the SRP's will be cheaper. Definitely go for the higher compression if you can. My JE's aren't all that loud when cold. The H22a seems to muffle alot of piston noise for some reason.

 

hmm, everyone seems to like the higher compression. isn't there more power to be found by lower compression and more advanced timing?

 

well, the head is off. i haven't seen it myself (not that i'd know what i'm looking at), but the shop reports (as many suspected) that the ringlands are gone. from their experience with this car on the dyno (going back about 6 months) they suspect the damage was done long ago, but i never drove it "hard" enough to blow the rings out completely. it explains why we kept dumping more and more fuel but never really got it to richen up as much as it should've.

they said the cylinder walls did not look scored or scratched, which now brings up the possibility of (instead of spending 1300 for sleeving, honing, decking, and new pistons + the cost of pulling the motor and putting it back) just honing the block in place and getting new honda pistons. figuring conservatively that it'll cost me $500 to pull the block and another 500 to put it back, the cost difference between the two is at least $1500.

hmmmm

 

Since you are just running the 9 psi pulley, I'd stick factory pistons back in and tune it properly to make sure it doesn't happen again.

 

Did you experience any detonation since adding the blower? That'll chew up rings real fast. If you know what caused the damage before and can avoid it in the future, use stock pieces. For more protection, you could still add forged stock bore pistons, rods too, without removing the engine. I think SRP or JE makes stock bore sizes.

 

when i got the kit, it was fine. shortly after, i started hearing detonation. i backed off, used half fills of race gas, but still, it did happen. we couldn't richen it any with the stock injectors, so i got bigger ones, and the detonation went away, although it took WAY more fuel than it should've (it was probably just blowing past the rings!)

so i believe the damage occured before the bigger injectors, but i can't really be sure. i would hope that with 440cc injectors and the PMS system it could be safely tuned and *not* require a built motor.

i thought you couldn't use forged pistons on an unsleeved H?

 

Oh yeah, that nakasil ****, right? Forgot about that.

 

so the real question, i guess : is 9PSI O.K. on stock internals (properly tuned)