diffent home for fuel injectors?

[NashMan]

Well, I have bean looking into this for some time, but my knowledge can only go so far.

Here is the idea: I was talking with a buddy and I know he's pretty dang smart. He was looking at the stock head, and I mentioned something I was thinking about for some time.

Moving the fuel injectors out of the head and putting them in the intake manifold flange to give better mix.

After a bunch of humming and thinking he gave me an answer.

He stated the 7m seems not to mix well, give poor performance and less flow.


What do you guys think?

 

[jdub]

Doesn't "mix" well? The same head (with mods) that has produced over 1000 HP and has no problem making 500 HP? What makes you think this is "poor porformance"?

I think your buddy is FoS.

 

[figgie]

tsk tsk tsk.....

Mix well it does. Homogeneous mix is the word you are looking for along with proper atomization.

the 7m head does indeed not flow as efficently as a 2jz and definetly no where near the 4G63 head. That is a head design issue and no amount of porting will fix that.

 

[jdub]

Flow is a different issue...it may not flow as well as later Toyota head designs, but porting, over size valves, and a matched cam will improve it. Moving injector placement to improve air/fuel charge ratio will produce little to no gain...the stock ECU (or an aftermarket EMS) uses injector duration to accomplish that.

The spray pattern of the injectors is the biggest factor and the head chamber design determines flame front progression/efficiency. To say the head will affect air/fuel charge ratio is barking up the wrong tree.

 

[landspeedrich]

tsk tsk tsk.....

Mix well it does. Homogeneous mix is the word you are looking for along with proper atomization.

the 7m head does indeed not flow as efficently as a 2jz and definetly no where near the 4G63 head. That is a head design issue and no amount of porting will fix that.

I agree with figgie,this is a design issue.But hey,aren't we looking for HP here?Not MPG!In my opinion,I want that fuel injected right at the back sides of the intake valves,as close as possible.Gasoline does'nt like to hang around in the air.Let the 15 to 25 lbs. of boost and that shiny forged piston suck all that mixture into the cylinder,and atomize it before reaching TDC.Then BAM!Thats whats its all about...right?My 2 cents RS

 

[ZFast300Z]

Machine a new head from a new peice of billet to use direct fuel injection. Way more efficient that way.

 

[SURUKO]

what engine is that in the little picture zfast3ooz???

can i get a pic???

 

[NashMan]

i highly dought he a fool since he teaches fuild dynmicks and such

he did not wip out any pads of paper or calculate any cetp in his head

this is what he said if you move them back a bit and 9orted and re shaped the ports and flange and filled in the old spot were the injectors used t be it whould do a better job

all in all just wounder if any one has thought of this

i heard of it befor on some race car go figure i forget what one all i know is it was a rally car

Doesn't "mix" well? The same head (with mods) that has produced over 1000 HP and has no problem making 500 HP? What makes you think this is "poor porformance"?

I think your buddy is FoS.

 

[Poodles]

Injectors are aimed into the ports, putting them at the flange wouldn't do that...

 

[NashMan]

it chould mabey if you reshaped every thing


basicly i foud my answer it's alot of work chould be good chould be bad in the end resalt

Injectors are aimed into the ports, putting them at the flange wouldn't do that...

 

[IJ.]

A lot of work and hassle for such a little gain....

crank another psi of boost into it and you'll pick up more power.