wich head-block combination ?

[mike260z]

hi everyone im building an early 260z

i have 2 engines:

1. L24 with E88 head

2. L28 with P90 head & F54 block (flat top pistons)

i want to go NA, wich combination is better?

i downloaded L-Series Engine Builder ( http://www.atlanticz.ca/zclub/techtips/enginemodellingsoftware/index.html ) is this program right with this set up ?

Block -> L28 Overbore - > 0.060

Rod - > L24 Crank - > L28

Head - > E88 Piston - > L28 Flat

Gasket - > Std Fly cut - > 0

Compression: ¿¿¿ 14.24:1 ????

what else can i do? head shave, port and polish, 3 angle job?

please point me in the right direction, thanks!

[jmortensen]

Are you wanting to do a destroker, and why? The difference in potential redlines is negligible and you'll make less power by losing displacement. If I were doing it I'd use the L28 crank, the L24 rod (better rod/stroke ratio), and a piston that doesn't come up over the deck. I believe the piston issue is why the calc says 14:1 compression.

If you just used the L28 block, crank, rods, and pistons and threw the E88 on there I think you're looking at about 10.5:1 down to something like high 9's. There are several different E88's out there, not sure if they all have the same size chamber.

[madkaw]

It would help to know what e-88 head you have. Like Jon said there are 3 different e-88's out there that all have different combustion chambers. The later e-88's aren't that great and I have read of detonation issues using those heads. The earlier versions are similiar to the e-31 and would be a nice head for a higher compression N/A. I stuck with my L24 with the earlier head, but displacement is your friend for HP. Make your choices carefully and I think you would be happy with any L engine engine as long as you use the right combination and tune it well.

ight I also suggest you go to Hybridz and check out the FAQ section on heads. There are some extensive threads on heads and their descriptions.

Edited October 20, 2011 by madkaw

[mike260z]

thank you both steve and jon!

how can i figure out what E88 head do i have?

[Zed Head]

You could go stock EFI with the F54/P90 combination and be pretty well guaranteed of a good running 280ZX power-level engine, with the engine harness, ECU and AFM from a ZX (75-78 Z parts would probably work also).

The 2.8 is 17% bigger than the 2.4. More power. Even with carbs.

Sounds like you're trying to mix and match 2 blocks and 2 heads for some benefit. There might not be any. Even with the E88 for higher compression, I think that you would lose overall from the smaller valves. If you don't want to go with EFI, the F54/P90 combo with carbs would still be pretty potent, relatively low cost and fewer problems since the parts are already matched and working together. I assume, unless you're rebuilding the engines. If you're rebuilding, there's probably a better combination of parts out there.

[mike260z]

im rebuilding engines

i have one 280zx (the F54/P90 with carb) wich i only bought to fix/sold

and im keeping the 260z (L24) thats why i have the chanse to do the engine combination to put it into the 60, but probably it would be better to keep the L28 (F54/P90)

what should i do ?

[mike260z]

anyone else'?