As in h22a big. Quick question though, h22a ('95) has 10.0:1 compression, correct? What would we be talking about in terms of hp/tq with a mild p&p of the head, 11.0:1 comp pistons...and something to bump up the fuel some...real simple stuff.

Tom

 

to get those kind of pistons in our h22a you have to sleve the block to make the walls stronger. the stock usm h22a puts out ~160 to the wheels (based on dyno sheets that i've seen) the port and polish work and the higher compression will kill lowend power but increase top end. unless you put some kind of rev kit and cams you'll loose most of the power up there. if you're wanting a streetable motor you may want to leave it stock and drop a power adder to it (such as NOS or turbo). now if you're going to race you might as well go for the whole thing instead of only going half way.

my 2 pennies... please, somebody, if i'm wrong please correct me so i can learn too

 

I'll disagree w/ you on this... Compression is one of the few win-win modifications you can make. Raising compression will give you increased HP/TQ up and down the RPM range, and will give a mild increase in fuel economy as well. Only down side is greater suceptibility to spark-knock. I'm not certain about the block sleeving bit tho... Probably depends on whether you can get the pistons in stock bore or only in an overbore dimension

P&P can be trickier, but if it is a mild job, it should have little effect on bottom end - you are correct tho on a full-out hog job - this would kill velocity at the bottom to gain flow on top.

Cams are where things get tougher - this is the thing that you literally cannot have your cake and eat it too with. Good low RPM cam sucks at high RPMs and vice-versa. That's why VTEC is so nice!

Paul

 

i agree with tec on this one. increasing compression is a neat change to make to a motor because it increases power throughout the rev band. and unlike many upgrades, such as an intake which may add 5 hp, the increased compression will be more noticeable the more power your car makes. an intake may provide 5hp on a stock motor, and 7hp on a built motor. whereas the increased compression may provide a 5% gain or more with each upgrade.

 

maybe i shoulda been more specific on what i was looking to accomplish. i know that increased compression is basically a win/win situation. what i want is 190hp/150tq through a very useable rev range. would what i listed as mods do this? (assume the basics + compression 11:1, p&p (mild) head...)

im looking to put together a decent daily driver while my integra goes down for some major reconstructive surgery.

Tom

 

You would probably be a little shy of 190 (WHP I'm assuming) w/ only compression and a mild P&P (180ish would be my guess). I believe you could hit it w/ those mods, a good header (not DC - Mugen or a custom job) and 2-1/2" exhaust/cat, cams, a Field/APEXi VAFC, and a CAI.

If you do this, make sure your head person takes off all the sharp edges in the combustion chamber AND off the piston. You will be real marginal on pump gas w/ 11:1. Also spring for a good 3 angle valve job.

Paul

 

Ok, here we go:
95 H22a
mild P&P of head (i mean real mild, just to clean things up, and springs and retainers to freshen things up)
Some kinda header: opinions anyone?
2.5" cat
2.5" exhast (Apexi)
Some kinda intake...
V-afc
(maybe a gsr ecu)

180-185 whp / 150 tq????

I just want it simple, and perfectly steetable.

Tom

(stock compression, rev to 8k only if i got with the gsr ecu...)


[Modified by Tomakit, 4:42 PM 9/7/2001]

 

ok. i understand now about the higher compression thing with what you have listed in your last post, 180-5 whp would be a good guess.