engine compression

[wesuk]

I have a 280zx with p90 head and flat top pistons. Can anyone enlighten me as to how to get the compression tp 10:1 (without spending too much cash) and it should run on normal pump gas shouldnt it?

Thanks Wes

[2ManyZs]

Since I'm not too familiar with the Zx engines I'll give you an idea at what you are trying to accomplish.

I believe the zx motors were around 8-8.5:1 stock. So you would probably be looking at a different set of pistons at the very least. You might need to shave the head a little (then shim the cam towers) to reach 10:1.

Try looking at the Datsun Garage in the links section for more info, I'm just giving you a guess.

10:1 would run OK on pump gas, as long as it's premium. I doubt you could use any grade less. Any more compression than 10:1 and you would likely have to use some sort of additive.