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Re: pros and cons of boosting an h22
actually this thread brings up a question that i had the other day....
i've heard about the whole "you have to resleeve an H22 if you do pistons". Why is that. Is the whole block aluminum? Does it have to do with the closed deck? |
Re: pros and cons of boosting an h22
Originally Posted by JDMFantasy2K
actually this thread brings up a question that i had the other day....
i've heard about the whole "you have to resleeve an H22 if you do pistons". Why is that. Is the whole block aluminum? Does it have to do with the closed deck? there is one forged piston manufacturer that builds pistons specifically for the stock h22 sleeve, mahle i think. |
Re: pros and cons of boosting an h22
Originally Posted by FooK
fiberized FRM sleeves... aftermarket moly rings will eat them alive.
there is one forged piston manufacturer that builds pistons specifically for the stock h22 sleeve, mahle i think. wtf is a fiberized FRM sleeve? |
Re: pros and cons of boosting an h22
mahle gold series pistons are supposedly FRM compatable, i havent heard many good or bad reviews as of yet though
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Re: pros and cons of boosting an h22
Originally Posted by d112crzy
cons:
if you really wana go big, you will have to resleeve. even if you dont go big, its good to relsleeve the block for reliability. FRM sleeves suxors. as long as you have a strong tune tho, you should be good for a while. Don't be surprised when they go, not saying it'll will definatly happen just saying it may. |
Re: pros and cons of boosting an h22
ok maybe I have calculated this wrong but as per RC engineering injectors flow rate calculation sheet
http://rceng.com/technical.htm#WORKSHEET 450 ccm injectors, at 50 psi of fuel pressure, 80% duty cycle and BSFC of 0.65, will support no more than 226 HP..... that leaves the DSM injectors a good choice for only the D series , LS engines and such. so in theory, for 350 HP (around what you get with 8-9 psi on a well tuned stock h22) if you don'T want to crank up fuel pressure and duty cycle to unsafe levels, you would need 700 ccm injectors. THat'S just theory though. But in real life, i have always maxed out 550 ccm's on h22's at around 8-9 psi. That's what's stopping me to keep cranking up the boost up. MAybe the BFSC is more like 0.55-0.60 on a boosted h22.... that would make more sense. |
Re: pros and cons of boosting an h22
Originally Posted by EF9_808
FRM sleeves are actually stronger than iron sleeves the problems with boosting an H22 will be failure of the ringlands. I've seen two h22's crack lands at 5 psi. One was a rev hard kit it was a show car and rarely driven (lasted 1.5 yrs) the other was turbonetics driven moderately hard (lasted 3 months) both engines had under 60,000 mi.
Don't be surprised when they go, not saying it'll will definatly happen just saying it may. |
Re: pros and cons of boosting an h22
Nothing but pros for the boosted h22. (soon to be.) :6
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Re: pros and cons of boosting an h22
Originally Posted by EF9_808
FRM sleeves are actually stronger than iron sleeves the problems with boosting an H22 will be failure of the ringlands. I've seen two h22's crack lands at 5 psi. One was a rev hard kit it was a show car and rarely driven (lasted 1.5 yrs) the other was turbonetics driven moderately hard (lasted 3 months) both engines had under 60,000 mi.
Don't be surprised when they go, not saying it'll will definatly happen just saying it may.
Originally Posted by BLAAST
ok maybe I have calculated this wrong but as per RC engineering injectors flow rate calculation sheet
http://rceng.com/technical.htm#WORKSHEET 450 ccm injectors, at 50 psi of fuel pressure, 80% duty cycle and BSFC of 0.65, will support no more than 226 HP..... that leaves the DSM injectors a good choice for only the D series , LS engines and such. so in theory, for 350 HP (around what you get with 8-9 psi on a well tuned stock h22) if you don'T want to crank up fuel pressure and duty cycle to unsafe levels, you would need 700 ccm injectors. THat'S just theory though. But in real life, i have always maxed out 550 ccm's on h22's at around 8-9 psi. That's what's stopping me to keep cranking up the boost up. MAybe the BFSC is more like 0.55-0.60 on a boosted h22.... that would make more sense. |
Re: pros and cons of boosting an h22
i have a set of mahle gold series pistons in my h22 they been in for the last year im runnin 11psi on a 62-1 i never dynoed it but im shure its makin 300+whp and i rip it everyday
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