Puting 280 FI on 240 head!!

[JEFF]

Does anyone know if puting a 280 Fuel injection system

on a '72 240 head is a problem. Sure would like to do it.

I have the 280 (1978) in the garage now to take it apart.

Any advice is appreciated.

- Jeff

[24OZ]

Jeff,

I want to help you but I dont know the answer. I have a 2.8lt FI in my 240Z, it had a 280ZX engine dropped in with all the FI trimmings, but not by myself.

I havent heard of your mod being done as I think most people would prefer to go for the L28, but that doesnt mean it cant be done.

GOOD LUCK! :classic:

[2ManyZs]

If you put the FI on a 240 head, for example an E-31 or E-88 you would have to have the head milled out for the injectors in the intake ports.

The only question I have is why? The N-42 head is a good head, it already has the larger valves that you would possibly want in the earlier head, and it has the intake already notched for the injectors. With a slight shaving, the N-42 head will give you the same compression as the earlier heads. Of course there are other FI heads, I am just using the N-42 as an example.

IMO, why spend the extra money when you already have the a head that will work just as well as an earlier head?

Just bolt the complete head, intake system off the 280 on, and then all you would need to do is the wiring, which might create enough head-aches as it is.......:cross-eye

[JEFF]

2ManyZ's -- the reason that I would put the

FI on the 240 head is because of

all the work I already did to it.

I milled it .020 and did the cam

bearings and a 3 angle valve job

with new valves and valve guides

and valve guide seals. BUT... if I can

get the same compression from the

280 head i will do that. I was under

the impression that the combustion

chamber diameter at the block face

would be to large. If I mill the 280 head

down to the same combustion chamber

depth would that reduce the dia. at

the head face? Isn't there more volume

in the 280 combustion chamber? milling

the head face wuold reduce the volume,

is that the way to get the compression

equal or more than the 240 head?? my

30 year old carbs need lots of TLC. then

I still do not have the responce and reliabilty

of the FI. If you had the parts in your

garage wouldn't you make the change??

The wiring is not a problem for me.

-- Jeff

[2ManyZs]

One of the main reasons I would go with the 280 head is the fact that you will need to mill the injector port into the 240 head or you won't be able to use the FI. Since I've never seen a cross section of the various heads, what I'm wondering is this. Is there enough material in the 240 heads to get the injector port milled without it getting too close to a water jacket in the head since the 240 heads were not designed to have the notch for the injector?

Yes, the 280 heads do have a larger combustion chamber, but with the larger valves they will flow considerably better than the 240 heads, and with a little mill work (shaving) you can come pretty close to compression ratio that you would have with a 240 head. Then there is the alternative of shaving and using one of the 1mm or 2mm head gaskets to bump the compression a bit more. Unfortunately these head gaskets are a bit pricey.....

There is one other alternative which I have thought about but have not seen or heard of anyone doing. Using the 240 head with one of the 4 barrel intakes, and using something like the Holley Pro-Jection fuel injection systems (yes, I know they are expensive). The Holley would offer so much more flexibility and capabilities as far as mixture settings. You can just bolt on new injectors, that this would be so much more adjustable than the factory FI system. Maybe one of these days I'll have the means to try one......Or if I had the money, I'd try one of the Haltec programmable set-ups or something similar.....

All in all, it's up to you and your machinist, if they can do your 240 head up with the injector ports, go for it.

BTW, I've had the parts in my garage, and never attempted it... call me chicken:ermm: :stupid:

[JEFF]

2ManyZ's -

Machining the port injection clearance in the 240 head would be

easy for me to do (I am a machinest - cylinder head mold maker).

But as you mentioned the posible trouble with the water jacket, I

don't think I'll try it - just refresh the 280 (N47) head and mill it to

match the dome height with my 240 head. If you think of any other conserns or benifits then let me know. Thanks for your input already.

- Jeff

[Rob]

No worries mate.

When I pulled the L26 out of my 260 and put it into an injected skyline I just carved the injector notches into it with a die grinder and it was fine. Also had to drill and tap a few extra holes in the head as a couple of bolts of the FI manifold are in different positions. Whole operation took less than an hour.

2-Many:

I would have been chicken too but it was only a ratty old L26 going into an even rattier old skyline so I really didn't care!

[2ManyZs]

I wasn't sure if anyone had tried it yet. But since you have, I say go for it! Main thing I was concerned about was getting too close to the water jacket and causing a hot spot in the head and having the head ruined.

I would have been out of my mind to advise someone to go cutting on a good head without knowing if it would even be possible. In this case, it would have been better to be on the side of caution.

One good thing about having a bunch of old parts lying around is you can try some of these ideas without loosing a pile of money. Always wondered why I had so many old junk lying around, maybe I'm just too attached to all the clutter....:cross-eye

[JEFF]

Thanks for all of your help guys -- I just finished removing the

wiring that i need to put the 280 head in the 240 block. Now

to referbish the head and get the Z back from the print booth!!!

I think i will be satisfied with the throttle responce and reliabilty

of the FI & electronic egnition, don't you?

- Jeff

[turbo240]

hey, there's a head tha came off an early maxima with a 2.4l l6 called te l24e which already has the injector notches. my dad is running one in his 260