Hi everyone. I’m getting ready to build a stroker and the question I have is.
-Is there anything different that needs to be done when building or installing a stroker for the coil pack era 4.0?
-Just wondering if the computer will be able to adjust the timing on its own? And is a upgraded fuel pump needed?
-And what’s the highest compression people are running on 87?
Sorry for the chain of questions. I’m jumping into this about 6 months sooner then I had previously intended due to the fact that I stumbled on a running 258 for 75$ tonight. Planning on pulling a 4.0 block from the upull this weekend from a 2001 Xj.
2000 and newer
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Re: 2000 and newer
The process of building a stroker is the same regardless of the type of ignition system you have.
The ignition timing is programmed into the ECU and is non-adjustable unless you slot the bolt holes of the CPS and advance the timing slightly by moving it upwards. Otherwise the ECU would need to be reprogrammed with revised fuel and timing maps.
The stock 90lph fuel pump is good for up to ~300hp so there's no need to upgrade it for a mild stroker.
If you use the 4.0L rods and go for Russ' custom pistons, the static compression ratio can be set at ~9.5:1 with a tight quench height so that the engine can still run on 87 octane fuel.
The ignition timing is programmed into the ECU and is non-adjustable unless you slot the bolt holes of the CPS and advance the timing slightly by moving it upwards. Otherwise the ECU would need to be reprogrammed with revised fuel and timing maps.
The stock 90lph fuel pump is good for up to ~300hp so there's no need to upgrade it for a mild stroker.
If you use the 4.0L rods and go for Russ' custom pistons, the static compression ratio can be set at ~9.5:1 with a tight quench height so that the engine can still run on 87 octane fuel.
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
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1995 Mustang GT - 4AT - Modded Sold
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Re: 2000 and newer
Ok what if I go with the 4.2l rods?
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Re: 2000 and newer
You'd have to use Silvolite 2229 pistons, mill the block to lower the deck clearance, and have the piston dish/combustion chamber volume increased to lower the compression ratio enough to run 87 octane. By the time you do all that and have the 4.2L rods reconditioned and balanced, you might as well use the 4.0L rods plus Russ' pistons and save yourself a lot of hassle.
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Re: 2000 and newer
Why 4.2 rods? Imo longer rod is better. By the time you send out the rods to get reconditioned you could of just bought a way better rod from Russ. Imo these rods are really top notch. Pistons are also. Btw these rods were all exactly the same weight.
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Re: 2000 and newer
What is the part number for these Russ pistons?Cheromaniac wrote: ↑May 2nd, 2020, 10:52 amYou'd have to use Silvolite 2229 pistons, mill the block to lower the deck clearance, and have the piston dish/combustion chamber volume increased to lower the compression ratio enough to run 87 octane. By the time you do all that and have the 4.2L rods reconditioned and balanced, you might as well use the 4.0L rods plus Russ' pistons and save yourself a lot of hassle.
So here’s where I am as of today. I have a completely disassembled 4.2.
Are these blocks or heads worth anything? The engine was in beautiful shape and I would hate to let such a nice looking block and heads go to waste.
And I have a 1999 short block that I just pulled from the yard today. Along with a 2005 head and and intake manifold.
I was thinking of going with the 4.2 rods because I assumed the pistons would be cheaper.
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Re: 2000 and newer
Contact Russ he’ll hook you up.
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Re: 2000 and newer
Send Russ Pottenger a PM for further information about his pistons and any other parts/services he can offer.Drednaut09 wrote: ↑May 3rd, 2020, 2:44 pm
What is the part number for these Russ pistons?
So here’s where I am as of today. I have a completely disassembled 4.2.
Are these blocks or heads worth anything? The engine was in beautiful shape and I would hate to let such a nice looking block and heads go to waste.
And I have a 1999 short block that I just pulled from the yard today. Along with a 2005 head and and intake manifold.
I was thinking of going with the 4.2 rods because I assumed the pistons would be cheaper.
Your 4.2 block/heads & rod/piston assemblies won't be worth much but I'm sure there's a Jeep enthusiast out there who'd snap them up.
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car
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Re: 2000 and newer
Mr Dreadnaut just PM’ed me and I’ll be emailing him information and pricing.
Thanks for the referral Dino and Beau!
Thanks for the referral Dino and Beau!
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