240z to 280z head...
 

ok i have a 240z engine. (l24) and i was thinking what benefits or cons i could get of putting an l28 head. would i have to do any mods to do this. if so what would i have to do specify please. THANKS. the head im putting had ROUND exaust ports. THANKS

I think you have to knotch the cyclinders for the larger valves/smaller bores. You can use the same intake/exhaust. See more on this at www.zhome.com.

hm so you think it would be muh wiser just to install the 28 block right?

L28's are a dime a dozen. you can find them all over... just go w/ a l28 out of a 280zx w/ the flat pistons (not dished) so you have a higher compression NA and run it carbed... ohhh yeah...

so wait i would have to swapp the siameesed pistons from the F54 block (280zx) ? and put flats on them?

I once dropped a 280z head on a 260 block w/flat top pistons. Fit w/o any problems, but I had to come up with a round port header (280z heads have round exhaust ports).

No, you would need an entire L28 from a 280ZX NA so that you get the higher compression engine with flat tops.

N 47 maxima head.

If you just want to kind of play around with different combos and see what the numbers would look like, try to get a hold of Lengine.exe from the Sydney Z Car Club. I think Blue or somebody over at zcar.com had a program for interchanging L engine parts, too. I think their both copyrighted, though, so you probably won't find anyone just posting them (shouldn't, anyway...).
Dave

is that a computer program or wassup a manual or what?

And dont forget the fuel issue, the later 280 heads dont have the opening for the mech fuel pump

no i have the 280z hed on a 280zx block

It's a program one of the Sydney, Australia Z-ers put together awhile back. It used to be on www.zcarclub.com.au, but searching around there now I don't see it. Somehow, it seems to have moved to Canada, in that nice collection of TechTips from the guy that goes by Blue: http://www.atlanticz.ca/zclub/techti...are/index.html
Definitely nice to have for playing around with different builds in theory, before you have to start committing money and time.
Note that it does have a copyright date and notice on it, so it really shouldn't get posted, or it can cause a world of trouble. Given the link is freely available, there's no need to post the program anyway.
have fun,
Dave

great great

it does'nt tell me the horsepower or torque or nothign that i can make by running a certain setup... whats up with that..

I'm gunna bite my tongue and just smile... :D

why is that?

Because no two engines are the same..

i understand but i thought that that program would give me an estimate at least from the choosen setup i would choose from the parts i would be running. but i guess not

someone would have to actually test every possible setup that the calculator is capable of computing and then input those values so the calculator could give you those results. So until somebody actually tests each and every setup in purely stock (parts wise) form the calculator wont give you that info.

They L28 head wouldn't be that advantageous on the l24 block from my understanding. You'd be better off using the l28 block with the e88 head from the l24...or whatever the other l24 head is.

i heard the P90 head is also good from the ZX models... what do you think ?

the P90 is the best flowing out of the box. The large valves and ports have the potential to flow a lot of air. Not the best for high compression though with it's large combustion chambers. It's combustion chamber design is also advantagous over earlier non P series heads.

so wich one would be a better PERFORMANCE ( OVERALL) better head. the
E88 mentioned by EMO or the P90 from the 280zx? seems like a fair debate.... But seeing that i WILL need this informaiton in the nearby future for my new engine project it could come in handy for somene to answer that question.

Unless you're only looking for a quick bump in compression I'd go with the P90. Its combustion chambers are optimally designed (for the era anyways) and the large valves and ports help it to outflow previous heads. Just look at it this way: The P90 was designed for the highest output L series engine available: The L28ET.

The question is are you willing to spend the money to optimize your engine to work with that head. You'll have to raise compression (or go turbo :p ) if you want to make decent power out of it. The whole premise behind putting an E88 on an L28 block is that it will raise the c/r, which in turn raises power output. If you're building a street car and just want a quick power fix: E88 (and remember, it's only the early E88 thats even desirable).