first stroker, need advice. very soon....

[biscuit]

here we go. my goal is to build a DD that will be as reliable as my zj 4.0 was/is. I picked up a 2k2 wj with a blown rod and its at the machine shop. i already had a 242 crank/rods.
i want to be able to do 2000 mile road trips on occasion, but i am mainly a 40 mile per day city driver. I want this to last over 100k miles too. given the fact that i can build a stroker for about the same cost as a stock rebuild i figure why not?

here is the idea

2002 block
3.895 bore (.20 over) getting square
3.895 stroke 242 4 weight
57cc head (estimate) 0630 head I know i'll need headers, the wj has the 2 precat y pipe. * cheapo aftermarket SS tube header for TJ 00+.. stock 2002 intake
.005 deck get the quench in range and leave 1 more shaving is that enough room for another?
.043 gasket chosen for quench
17.5 dish 677AP pistons
8.875 short rod from 242
CAM wanting to use 91-95 stock. for DCR, and i am a little reluctant to spend $$ on aftermarket. skinnier lobes, budget blanks burning up??
270 duration
112 separation
-8 retard - thats what the calculator put in.

this gets me a 4.56L with 10.02 SCR and 7.39 DCR and a quench of .048

stock on my old zj (255k miles) correct me if i am wrong

3.96L 8.79 SCR 6.42 DCR quench .0725

i am using the stock cam to keep the DCR down for 87 octane, using an 0630 head for better flow (the wj had a non tupy 0331). i can source a tupy, but i am reading a 0630 head would be worth the extra 150$ in exhaust plumbing.

any advice would be greatly appreciated. S#!t is about to happen!

[SilverXJ]

If you are going to use a stock cam I would recommend using the one for your block so you can retain the cam retention plate.

[gradon]

You mean you have the 258 crank

[biscuit]

yes, i have the 258 crank and rods (i listed 242, and that would not be a stroker lol). as for the cam, i have the 258 cam (no use here) the wj cam, prolly gotta use it im learning.

the wj cam profile will make me have to dish the pistons up to at least 26cc's to get my DCR under 8. again still hoping for 87 octane, the squish would be good @ .048

thanks silverXJ for learning me bout the cam plate.

this of course is assuming the stock cam 190k miles can still be used with just a polish. if not, then i have the purchasing option.

Emissions are a concern. where i am at they just plug into the obdII and check the gas cap for seal. so as long as i am not throwing codes, then i am good on the emissions. Sorry forgot to add that bit of information....

[biscuit]

what is the deepest dish that can be milled on a stock/shelf piston? 18cc? if a compressed volume of 83cc is desired, can it be achieved with a stock piston and a stock head while maintaining a quench under .050??

can a short rod stroker be built to run on 87 octane at sea level without custom pistons? Playing with the cam profiles availible can get a 74.5cc compressed volume to about 8.16DCR thats using the crane 753905. but i'd prefer to use the stock cam.


my head hurts.

[Russ Pottenger]

I've got 28cc from a 677 piston with no problems.

You can run the short rod 677 piston combo, but if you want a tight quench you'll need to deepen the dish.
You want to shoot for a .038 to .040 quench. I've run it down to .030
but is very difficult to do with a press pin rod.

When your getting up to .070, you really don't have a effective quench anymore.


Russ

[biscuit]

what gasket did you use to make that quench? i thought the victor .043 and 0 deck was as low as you can go?

and as for your piston dish, i assume you had to go outside the stock D shape to get the 28cc's.

[Russ Pottenger]

I have used both the Victor/Mopar .043 and the Felpro .051 head gaskets.
I'll shoot for a .015 positive deck and use the Felpro gasket. Most of my combustion chambers wind
up being 62cc

I'm not opening the D dish, but utilizing a very generous radius on my ball end cutter to
achieve this. Under no circumstances you should build a piston with a full circular dish on a
normally aspirated engine with a closed chamber head.


Russ

[biscuit]

do you dish these yourself? I am still looking for someone to dish pistons for me. I have found a local machinist that is well recommended, however due to a death in his family he is taking a few days off. with this situation, i expect him to be backlogged. if this is the case, and once he tells me what piston size i need, i may outsource the piston work. I am in illinois near st. louis. If you could point me in the direction for piston work it would be greatly appreciated. oletshot doesn't do it anymore.

thanks again.

[Russ Pottenger]

I do them myself.

I have both 677, and the 2229 KB Silv-O-lites on the shelf done that I sell for $200.00 plus shipping,
or I can do yours for $75.00 a set.

Thanks,
Russ

Bishop-Buehl Racing Engines
531 N. Lyall Avenue
West Covina, California 91790
Work (626) 967-1000
Fax (626) 967-7836
Cell (626) 673-2203
Email/PayPal: [email protected]

[biscuit]

ill be in touch on those pistons as soon as my machinist gets back to me. his wife passed away so he is taking some time and will be a little behind. thanks.

[biscuit]

are mopar purple camshafts 28-30ab series available for the 99+ engines? i see the 30ab and it seems to be a good choice. i like the wider lobes, the profile seems fine, and i am skittish about the comp cams 68-231-4. i don't understand why the stock cam survives fine and the aftermarket fails. i know break-in and all the other causes of failure. but i can't help but think the wider lobe is beneficial. Add lifter grooves to the concept and i think it would be a good combination.

[biscuit]

after more homework. figured out i can change over to the older cam in the newer block.

[jeepxj3]

after more homework. figured out i can change over to the older cam in the newer block.

I wouldn't do it.
You can get a custom grind cam that will work with your newer block with the cam retention plate.
Jones Cams.

[biscuit]

any chance jones cams has the wide lobe blanks? the wide lobe is swaying me to the 29ac old style. help me out here, why wouldn't you do it? the mopar cams spec out just fine on what i want, plus the wider lobe, my old style cam is on 256k miles. the old design works well, and from what i understand all i have to do is get the pin/spring/bolt/ and dimpled timing cover, then put it on the 2002 block. Any help/advice here would be appreciated.