Mod 280Z N47 Intake to fit L20b

[Riceball]

Hi all

Need some help.

Can someone inform me of the possibility of cutting the two intake ends apart and bolting them onto an L20B with W58 head. I'm trying to find a intake solution to modify for fuel injection and forced induction. Thought I remembered someone posting that the manifold pattern on the two end ports match the L20B heads. My plan is to fab this to accommodate forced induction intake.

I can't seem to attach a picture, but I the question is regarding a 280Z N74 intake

Thanks in advance

[Lockleaf]

This seems to be an old thread but if anyone is interested: About 20 years ago when I built a EFI L18 510 for a customer/friend.

I used a 280 Z ,manifold, cut out the two center runners, reworked the plenum to match up.. That was the most difficult part on the manifold as when the center was cut out there was a mismatch in alignment. I used the EFI parts from a 200sx and electronic ignition distributer from a later l20. I was able to tweak the air flow meter and some other settings. It worked out great. I don't remember a lot of the details after 20 years but I built some pretty mean 510s before I turned the shop over to my son. I probably notched the intake ports to be like the 280.

[datzenmike]

Yes it was done to an EFI intake but 10 years ago maybe. I think you need the earliest intake that is parallel to the head Because if the intake plenum is not parallel with the head, but angles towards it, when the center section is cut out, the front does not line up with the rear. I think the cure was to shorten the front two runners or lengthen the rear two runners so the two halves aligned for welding. It's not a case of cut out the center and weld them together. It's certainly do-able but tricky.

 

Anyway this guy found the right intake...

 

 

 

One obvious thing is the front two cylinders are forcing the air to make a more than 90 degree bend.

 

Here's the post... http://community.ratsun.net/topic/2165-project-ghetto-efi/

 

[Riceball]

Hi Lockleaf

 

Thanks for the info. Do you happen to recall if the mounting holes on the intake runners to head line up.

[datzenmike]

You have to drill and tap single holes between each runner on the head. The L 4 cylinder heads have two that don't match.

[bananahamuck]

Here's one i got from HRH that i think his friend welded up for him,,, mounting hole is oblong because they miscalculated when they drilled it ,, and notice they cut tubes to angle the flange better.. No order to pictures as i just went out and snapped a few just now.
 

It is just laying on another engine to get snaps.

It's in a thread somewheres but i don't know what it's called
 
 

 
 

 

 
 

 
 

 
 

 
 

 
 



not sure why they are all upside down though

.

[Lockleaf]

Wasn't me who did it, just passing on info I saw

[LenRobertson]

If you haven't seen HRH's thread:

http://community.ratsun.net/topic/22074-510-l20b-efi-conversion-the-project-is-finished/

you may find some useful information there. Unfortunately most of the pics are missing.

 

Len