Do-anything LJ build advice
- Thread starter Marklar1983
- Start date
Rattle-canned the bare spots on my winch plate, removed the steel rope, and installed a WRG fairlead. WRG synth rope goes on the spool tomorrow!
Engine refurb in the works. Looks like some combustion leakage through the head gasket from #2 through #5. Is that normal?
Needs a new cam, but I’m planning to leave the pistons and bearings alone unless there’s an obvious problem. Planning to take the head to a local machine shop to clean it up, grind the valves/seats, etc.
Cam timing gear wear. PO never replaced the factory OPDA (I did, but the timing has always been weird.) Now I also need to install a new Crown OPDA because the cam gear damaged the OPDA gear.
But hey, since I’m tearing the engine apart, I’ve decided to build a 4.6L stroker. 
Clegg Engine Stage 2 Jeep Stroker Kit 4.6 Liter / Compression Ratio = 9.3:1
- KB Hypereutectic Dish Pistons -21cc (KB438C)
- Hastings Moly Piston Rings
- Scat / Eagle 9000 Series Cast Steel Crankshaft 3.895” Stroke #9-4.2L-3895
- Scat 4340 Forged Rods (Free Floating) Bushed w/ ARP Bolts
- King Connecting Rod & Main Bearing Set
- Balanced rotating assembly
Bosch 4-hole injectors 24 lb/hr @ 49 psi (factory injectors have enough flow with the '06 sending unit)
Comp Cams 4x4 Extreme cam 163-201-5
COMP Cams High Energy Hydraulic Lifters 822-12
Flowkooler high flow water pump
Clean and resurface stock head
Valve job w/ factory valves, rockers, and springs
Deck factory block to 0.000"
Bore 0.030" over
https://www.jeepstrokers.com/forum/calculator/
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Good price for what you get.who is doing the work? What cam?
I have pretty much the same as their upgrade list with the exception of Going full retard on custom 10.2:1 forged pistons,edelbrock head,and custom ground nitrided comp cam. Doing it again I'd think hard about a point lower compression and the cheaper rods,stock head and stock cam. At least where I'm at i may as well go full retard with a bigger cam and a custom tune
Good price for what you get.who is doing the work? What cam?
I have pretty much the same as their upgrade list with the exception of Going full retard on custom 10.2:1 forged pistons,edelbrock head,and custom ground nitrided comp cam. Doing it again I'd think hard about a point lower compression and the cheaper rods,stock head and stock cam. At least where I'm at i may as well go full retard with a bigger cam and a custom tune
Added more detail to the first post.
May need shorter rods since I'm decking the block, will measure for those when the time comes.
Machine work will be by Moore Engine Supply in Auburn, and I'm doing the assembly. I'm in Reno, but all the engine shops here are booked out 6+ months.
Also installing a Luk clutch on the factory flywheel. Do I need to replace the flywheel and pressure plate bolts? Those I removed are in good shape.
How much deck material to remove with those kb pistons to get zero deck?
I don't think you want to run the shorter 4.2l rods because the block got decked.that sounds odd. Just get pistons for the 4.0l rods.
Is the zero decking taken into account with your dynamic and static compression ratios?
Take a look at russ pottengers pistons available with many compression ratios and zero deck without needing to shave the block or use shorter rods
4.0L rods and "custom" pistons. Moore won't start the machining without pistons in-hand, so the clearances will be right.
Piston spec:
Ok, so since you don't have 1.380" compression height(zero deck pistons) so the block will be milled .027"ish to get you there.You subtracted the .027 from the quench to get you numbers in the calculator?
Mahle makes a nice MLS head gasket with .040" quench.seems cleggs sells it now. The gasket thickness is your quench number for the calculator if you are zero deck btw.
I always wondered why none of the off the shelf stroker pistons have zero deck?
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Fel-pro gasket is 0.051”, advice I read was to keep quench at or above 0.045”.
I suspect the pistons are not zero deck so there’s room for variability or to mill out damage.
What fuel do you run?
Yep,going by your compression height listed those Keith blacks are .027 in the hole.stock wasn't zero deck either if I remember right.
I run 91 octane and should probably be using a cam with more duration to bleed off cylinder pressure than the 68-231-4 comp cam i have.(or less compression honestly) @SkylinesSuck has a nice cam in his stroker that sounds good and rumpy. A 235 or 239 would be fun in my 97 motor.
The aluminum head and .040 quench are essential in fighting detonation with what I have.
Stock deck clearance is 0.0215”. Rods are 6.123”, I think. The length is not called out specifically in the kit. According to this post on JeepStrokers.com, the forged Eagle rods are 6.15", and "The IC944/945 piston would have been ideal together with the Eagle rod if the two were compatible..." and the pistons I'm getting have the same pin height as the IC944. So, it's either perfect, or it's not.
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Stock deck clearance is 0.0215”. Rods are 6.123”, I think. The length is not called out specifically in the kit. According to this post on JeepStrokers.com, the forged Eagle rods are 6.15", and "The IC944/945 piston would have been ideal together with the Eagle rod if the two were compatible..." and the pistons I'm getting have the same pin height as the IC944. So, it's either perfect, or it's not.
Well, according to Eagle they have never made a 6.15” rod for the 4.0. Damn. I did find a head gasket at just 0.027” on Summit, however.
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