injectors 7afte, will these work? Options

[Kwanza26]

Strength of the crank is not and should not be considered a major issue unless you plan on pushing 300+ whp. I'd say the cranks are plenty tough. It's always the stuff around the crank that fails first (bears, rods, pistons, etc).

Also... 84mm is not gonna be OK. Based on rebuild specs alone, they don't reccomend anything over 82.25mm... 83mm is pushing it... 84... I think you'll be overheating, possibly even stress fracturing the cylinder walls especially if you plan on boost. There isn't a whole lot of meat between the cylinder walls and coolant jackets... These closed deck blocks just aren't too keen on being overbored... since they're already "overbored/stroked" versions of much smaller motors (original A series blocks only were 76mm bore)

[Kwanza26]

Which is why I was thinking the other day... Arent 4age cranks stronger than 7a?  I know the 7rib block is probably twice the strength... and rods can be had cheaper.  Would a built 4a not be safer than a built 7a?

Overall, I am very interested to see how Nik's engine turns out.
[right][snapback]314802[/snapback][/right]

The 4A can handle stress because it's an oversquared design (smaller stroke than bore). The crank and rods take less stress, but a result of that is a poorer torque curve. To compensate, the 7A crank has larger journals (48mm rod/crank journals). Tis also a reason why you don't see many undersquared or even squared V blocks...

I too am happy for nik. Work more... talk less. That's how things get done. Much kudos to nik for doing more and talking less... ;]

[van95st]

I was wondering about those 550cc injectors. If you run to big of an injector could you run into a problem with fuel atomization, if you have to "turn down" the fuel output with a management system? Or would it just open for a shorter duration when filling the cylinder?

[FallenHero]

big injectors do generally have trouble putting out such a small amount of fuel. Or so i read and hear.

[nik]

Which is why I was thinking the other day... Arent 4age cranks stronger than 7a?  I know the 7rib block is probably twice the strength... and rods can be had cheaper.  Would a built 4a not be safer than a built 7a?

Overall, I am very interested to see how Nik's engine turns out.
[right][snapback]314802[/snapback][/right]

The 4A can handle stress because it's an oversquared design (smaller stroke than bore). The crank and rods take less stress, but a result of that is a poorer torque curve. To compensate, the 7A crank has larger journals (48mm rod/crank journals). Tis also a reason why you don't see many undersquared or even squared V blocks...

I too am happy for nik. Work more... talk less. That's how things get done. Much kudos to nik for doing more and talking less... ;]
[right][snapback]314862[/snapback][/right]

nice new pics are up inte 7agte diary getting close to installing it but i'm going to HIN so it has to wait for a few weeks

[normality78]

ok, back to injectors

How about using 4EFTE injector? its 295cc high impedance injector. But according to some 4EFTE owners, the injector maxed out on 160whp. (read on pg1, 290cc can support up to 200whp)

Im targetting 180whp but i do not want to use 440 as im only using emanage to control. I do know too big injector do have problem in idling or providing low amount of fuel on closed loop

[presure2]

ok, back to injectors

How about using 4EFTE injector? its 295cc high impedance injector. But according to some 4EFTE owners, the injector maxed out on 160whp. (read on pg1, 290cc can support up to 200whp)

Im targetting 180whp but i do not want to use 440 as im only using emanage to control. I do know too big injector do have problem in idling or providing low amount of fuel on closed loop

actually, 290s will not support 200whp...the supra 315CC injectors are only good for ~190-195..
for a 180whp target i would look for somthing in the range of 360cc

[normality78]

yeah, im using 360cc now which is frm GZE. but god damn it. the guy who done my turbokit doesnt tell me its low impedance until when i go for emanage tuning, found out why issit on close loop i was able to control my fuel at all

[doGGy]

On my old 7AFTE i used Ford Probe Turbo 360cc injectors. pushed 219hp at the crank and injectors where about 70% maxed out (on emanage).