Whatcha think about this?

[jamesot]

Still trying to wrap my head around all this stroker stuff. Looking for experience and opinions. First time posting on this board.

92 XJ, 4.0L, Auto, 33x10.50, 4.10 axle gearing, 420,000KM original engine, Gonna build a stroker for when the time comes....tic tock, tic tock..... lol

The Truck is a daily driver and weekend warrior, sees alot of dirt throughout the year. Truck spends the work week between sea level and 200-300ft elev. and goes up above 7000-8000 on weekends and summer back road trips. I like the torque and power curves of the stock 4.0L and I am building up a stroker because I am rebuilding an engine anyways to swap in before I really findout just how long the old 4.0L can go for.

Here is what i have in mind. please tell me what i have not considered/didn't realize. educate me if you will, or suggest otherwise.

4.6L Low-buck, low CR "rockcrawler" - Slightly Altered - help me make something like this work.

Jeep 4.0L block (53020569)
Jeep 4.0L Head (7120)
Jeep 4.2L 3.895" stroke crank (3727)
Jeep 4.2L 5.875" rods (707)
Silvolite UEM-222 or 677CP +0.030 bore pistons
Increase piston dish volume to 30cc (I am unsure even if this dish is possible... the recipe says so but the FAQ says otherwise...)
8.75:1 CR (???????????? when I put the numbers from the recipes into the calc.... I always end up with numbers that don't jive???? Please let me know what I am doing wrong here?)
Stock 4.0L Camshaft
Ported HO 1.91"/1.50" cylinder head
Mill block deck 0.035" (I would like to avaoid milling the deck if possible... However I need advice on this as well)
Mopar/Victor 0.043" head gasket
0.058" quench height ( this is also unknown??????)
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines
1999 or newer Intake/stock throttle body
Header of some sort, 2.5" or 3" exhaust, free flowing, etc.
234hp @ 4500rpm, 311lbft @ 3300rpm <--------- I would be quite happy with numbers like these as i ca count on one hand the number of times my engine has been over 4000 RPM, rarely over 3200 RPM

Below is the original recipe
4.6L Low-buck, low CR "rockcrawler"

Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Silvolite UEM-2229 +0.030" bore pistons
Increase piston dish volume to 30cc
8.75:1 CR
Crane #750501 192/204 degree camshaft
Ported HO 1.91"/1.50" cylinder head
Mill block deck 0.035"
Mopar/Victor 0.043" head gasket
0.058" quench height
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines, stock injectors with stock 49psi FPR for '96 and later engines
234hp @ 4500rpm, 311lbft @ 3300rpm

I do not know the DCR for either of the above engines. I am not looking for huge horsepower or High CR (more like LOW CR). I would be very happy with a 40 hp and 60-70 ft/lbs jump some of which I am sure will come from the newer intake. My main concern is being able to burn 87-90 octane fuel.

So ...... please help me figure out how to acheive these goals.

Thanx.
James

[jamesot]

OR................
Am I just making things more difficult for myself with the stroker idea.
Would I be better off doing something like this and not having the fuel "maybe's"

Full Rebuild on motor
Bore .030" or 0.040" over
slap a torquey cam in there
header and high flow exhaust
Cold air intake (already done)
1999 or newer intake
port and polish the head
bore the throttle body

I would imagine the sum of all this work would put me close to + 30 HP and + 40-50 ft/lbs???

Or am I way off base?
Thanx,
James

[dwg86]

Use Speed Pro hypereutectic pistons, and send them to oletshot (on this forum) for increased dishing. Zero deck the block. Or buy keith black 944 pistons and use 4.0 rod, and zero deck. Keeping the quench low will help alleviate detonation. I would think with a SCR no higher than 9.5:1, with a quench of .040-.050 should be ok to run on pump gas. I am just speculating, because my stroker is not finished. Maybe some others who have built thier stockers can chime in on what thier build is, ans how it runs on pump gas.

[jamesot]

Thanx for the reply.
I can get all the machine work done locally in Vancouver, so not a worry about dishing the pistons to suit what ever I build.