is 19lb enough????

[jules325i]

Mine is 86.5

[digger]

i have heard of 87mm being done

[323iNathan]

If memory serves the m20 cylinder spacing is 91mm. Stock the b25 is 84mm bore, leaving 7mm between cylinders. MM use 86mm pistons and there doesn't seem to be issues with 5mm between cylinders. I think digger has his block bored out to 86mm in his b31 stroker.

In short half a mm over is fine.

[backwoodsE30]

Just an after thought. There is enough meat in the block to bore it .50 over right?

[backwoodsE30]

Found a nice set from a fellow r3v member for 40 bux.

[digger]

Very true. There's no replacement for proper chip burning or standalone. I also notice a lot of people just adding fuel for no reason.

Didnt you know

More fuel = more power ;)

[ForcedFirebird]

i think it is a claim and that its likely closer to 200 but thats just my opinion. it does show however that there is no basis for needing to upgrade injectors with basic bolt on mods if a properly worked 2.7L can handle it without problems, i don't thinnk it is a great idea either but........noone is suggesting to do the same. People seem to want to add bigger injectors or AFPR instead of getting a proper tune (adjusting existing injector pulse width). Even with crappy old injectors i'd be looking to get something as close as possible to the stock size even if 19lb are cheaper but at the end of the day if you get a chip or whatever that was done with xyz injectors, then use xyz injectors.

Very true. There's no replacement for proper chip burning or standalone. I also notice a lot of people just adding fuel for no reason.

[digger]

Alpina claimed that as BHP, 180whp would be the limit if the .4-ish BSFC is true for the m20.



I looked at the Alpina .bin file this morning and there's very few spots the inj hit full open (~98%-100%), to my surprise. Mainly in the power enrichment table. They definitely were on the edge of the stock injectors, though, and agree that it's not good on them to be running that high of a duty cycle.

i think it is a claim and that its likely closer to 200 but thats just my opinion. it does show however that there is no basis for needing to upgrade injectors with basic bolt on mods if a properly worked 2.7L can handle it without problems, i don't thinnk it is a great idea either but........noone is suggesting to do the same. People seem to want to add bigger injectors or AFPR instead of getting a proper tune (adjusting existing injector pulse width). Even with crappy old injectors i'd be looking to get something as close as possible to the stock size even if 19lb are cheaper but at the end of the day if you get a chip or whatever that was done with xyz injectors, then use xyz injectors.

[ForcedFirebird]

Yet claims that stock injectors are only good for 180hp still persist.....:(

Alpina claimed that as BHP, 180whp would be the limit if the .4-ish BSFC is true for the m20.

they must be running near 100% DC though. there are reasons that's not a good idea.

I looked at the Alpina .bin file this morning and there's very few spots the inj hit full open (~98%-100%), to my surprise. Mainly in the power enrichment table. They definitely were on the edge of the stock injectors, though, and agree that it's not good on them to be running that high of a duty cycle.

[nando]

they must be running near 100% DC though. there are reasons that's not a good idea.

[digger]

My Alpina B3 engine ( non-kat ) makes ( when new ) 210HP with stock injector and FPR.

Pierre

Yet claims that stock injectors are only good for 180hp still persist.....:(

[backwoodsE30]

over $800 in parts from bavauto ordered!

[pegase747]

Alpina made 200ish hp from standard injectors.............i would use what miller suggest

My Alpina B3 engine ( non-kat ) makes ( when new ) 210HP with stock injector and FPR.

Pierre

[MonkeyMan]

Has anybody dealt with five 0 injectors? $250 for a set of bosch injectors

mine are from a Mustang.. I got the used set (of 8) for $45 iirc, and I sent 7 of them to Witch Hunter to get them cleaned and flow-tested for $140..
there's no need to buy new ones.. just search the forums - they're out there..

[backwoodsE30]

Has anybody dealt with five 0 injectors? $250 for a set of bosch injectors