first stroker m90/4.5

[heepofjeep]

i have been planing on doing a stroker for a while now and at first i was going to do the same thing that rradfor9 did for his grand cherokee. seemed mild enough and fairly cheap, but the more i looked into stroking the i6 and what i wanted it to do and what it was capable of doing without boring it over, i figured i cant do what i want and keep it as budget as i wanted. i saw a thread on another forum online that some one had put an m90 on his stroked 4.5 in a yj. i'm looking to get a JY motor preferably 91-95. so heres my parts list, please look it over and let me know if i missed anything or of something wont work.

91-95 block and head
4.2 crank from a 78
was thinking speedpro H802CP pistons and dishing them to 22-30cc to bring compression ratio down from ~8.9 to 8.6
zero deck clearance(is it really needed?)
was going to run 4.0 rods as i've heard there stronger than 4.2 but recently read that the pitons need a shorter pin height to work?
seal pro gasket kit - SLP-260-1712
m90 from a 89-91? ford thunderbird where a/c is now
has almost new water pump/thermo and csf or gdi 3 row rad with taurus 2 speed fan
harland sharp rockers CSP-S40196
split second AFC or FTC not really sure which one some people say one and some say the other?
wide band o2 sensor and a/f gauge from innovativemotorsports
have reman mustang 5.0 injectors
comp cam kit CCA-K68-231-4
and high flow oil pump

i have a few more questions about the charger but i want to get the stroker down first

[gradon]

Dunno how much the 802/825s can be dished; they are good pistons(I'm using them), but can only be used with the 4.2 rods if stroking. The KB 944s have ~22cc dishes, are forged(good for FI), and work with the 4.0 rods. Zero deck is preferable, but you do want to shoot for that magic 8.5:1 pre-boost, so if you can't get a big enough dish out of the piston, then don't deck the block to keep comp down. You'll want the FTC so that you can have the ability to retard timing.

[heepofjeep]

ok ill look into the 944's. what should i look for for a harmonic balancer?
edit* would it be worth it for me to bore .030 over and use bigger 944's? theres a chance ill have a machine shop available to do it for cheap/free

[gradon]

I did +.030 over on mine, but if I did it again, I'd go +.060. The pistons cost the same and you lose more of the shelf that the top of the bore has in the combustion chamber(sharp edge that's ping-prone). I'd never recommend anyone to do a 4.5l due to the stroker using unused parts of the bottom cylinder walls that the stock 4.0 didn't(that transition would not be ideal for the rings, nor compression imo).

[heepofjeep]

yea when i saw they are the same price for .030 and .060 why not go bigger. is my cam a good choice for a blower?
kinda sad that my estimated total price is almost twice than i paid for the heep its going into..
side not how well do you think 3.73's or 4.10's and 33's or 35's? hp44 and 9 inch

[4.whoa]

Dino's cam spec page has good info for making comparisons.http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm
With forced induction you dont want a too much overlap.

[heepofjeep]

stock is 46 and mine would be 32. that enough or should i get into the 20's?

[SilverXJ]

what should i look for for a harmonic balancer?

Don't get a Professional products one. you have to make your own timing mark.. unless you want to do that. I heard pioneers are good.

would it be worth it for me to bore .030 over and use bigger 944's? theres a chance ill have a machine shop available to do it for cheap/free

Verses what? sticking a 944 in a stock bore?

As for the cam I would call a few cam companies and ask for a recommendation on a custom grind for the blower & stroker. Most likely no off the shelf cam would be a good bet.

[gradon]

I think you'd be fine with overlap that is <or= to stock, so 30-40ish, but I'd get some advice/do research from the FI gurus(ask hesco or 505performance). In the Jeep world, people tend to use 4.10s with 32&33s and 4.56s with 35s. I just overgeared mine jumping from 3.55s to 4.10s on 27" tires(I shoulda went 3.73, oh well). Being that you will have extra power with the FI, you might want to be a gear step lower than those guys so you're not having to baby the go pedal(like I sometimes do in 2nd). Oh yeah, I spent $1200 to get my 96 2dr 2wd ax15 4.0 Cherokee with 60 or 66K on it(I swear I have to search NAXJA and JS to get my facts straight, lol) and have probably spent 5xs that amount modding it(and I still want to do more), but that's the fun of personalizing your ride to your specs.

[heepofjeep]

i contacted comp cams about the overlap and am waiting a respond.

Verses what? sticking a 944 in a stock bore?

no +.030 vs +.060 for the same price. why not go bigger

[SilverXJ]

no +.030 vs +.060 for the same price. why not go bigger

Only two reasons I can think of. Possibly not enough meat left to do another bore and weaker cylinder walls.

[heepofjeep]

so your saying wait on getting pistons? check the head first make sure i can go bigger?

[SilverXJ]

No, I ma saying that you have to decide if you want to go .060" over. If you do there may not be enough metal on the cylinders to do another rebore/rebuild should something happen or when your stroker just gets old. Plus I don't know of anyone that makes a larger oversized piston than .060" if you do rebore. Other than custom that is.

The head has nothing to do with it.

[heepofjeep]

i have no clue what i was thinking. but yea that makes sense i guess ill just have to see what happens

[heepofjeep]

i saw some where that you cant dish the 944 further than factory ~21cc? is that true? i was going to dish to 30cc. what about KB 2229-060? can you still use a 4.0 rod with those? what about dish?