Stoopid Noob Questions

[Midnight]

I'm still in the planning stages of my stroker project. I THINK that I have pretty much decided on the 4.6 low-buck option 2. I haven't gotten too far into it. Just trying to collect parts right now. As of no I have an engine (essenstially the block and head) from a 99 WJ, an intake from a 93 YJ (looking for a 99+), Ford 25# injectors, a definite connection where I can get 2 4.2 blocks with the crank and pistons intact, and a few misc parts.

One thing that has me baffled is what dictates what year the "engine" is for the adjustable FPR? I guess it depends on what it's going into? (93 YJ)

Another concern that I have is the ability to run on 87 octane. I'm about 1000' above sea level. Is there anything that I can adjust or do at the planning stage to help in this area. I've been reading all that I can find on this for the last few days, but it still has me stumped.

-Midnight

[RAPTORFAN85]

The fuel pressure from 96+ is 49psi. Before that it was 39psi. Your 93 YJ will have 39psi.

Things that affect the ability to run 87 octane are mostly the compression ration and the quench.
The tighter the quench the higher the compression you can run. Compression also gives you power so most guys try to bump the compression up.
But in doing this it makes it harder to run lower octane without pinging or detonation.
The lower the compression the easier it will be to run lower octane but will affect power to a degree...
Probably the easiest way to go is a moderate quench (.065) and a moderate compression.

Also you should be looking at your Dynamic compression more then the static compression when it comes to running certain types of fuel.
(this is were the compression calculator is a big help.)


I personally am shooting for a high compression with a very tight quench (.045) and am hoping to run at least 89 octane.

I know of at least one guy (bratcop) who has almost the same setup as me (.045 quench and 9.4 static comp. 8.0 dynamic comp.) that runs on 87 oct.