Calgary Jeep Association

Author Topic: Stroker motor  (Read 117 times)

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Offline Sixty4X4

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Stroker motor
« on: November 21, 2017, 07:23:59 PM »
So after my introduction (which stated a 4BT conversion soon) I see an article featuring a 3.8 to 4.1 Stroker kit available from 505Performance. Article was featured in Four Wheeler magazine. The kit uses offset ground crank so fixes the spun bearing issue using stock type bearing shells and also addresses the oil burning issue with good old fashioned oil rings installed in a new stroker forged piston. They also use better rockers on the existing shaft (good old Mopar for the shaft) and modify the heads in the exhaust ports and 5 angle grind. All in all they are quoting roughly 340ft/lbs & 240-260Hp with a little better economy. This will still be a $7000hit but at least I don't have to go find parts and pieces as all stock parts fit.
My questions here are; has anybody in the Calgary area done this conversion? Is there a machine shop one would recommend to do the machine work? My reason for the change back is the engine would remain to be compatible with the CPU systems etc, I would add a heavy flywheel and I intend to jump on a Diesel Rubicon if they ever get here so my 2008 would be a sellable item still. Any comments will be appreciated.
2008 JKU Ruby, Jeep steel bumper, 9500 winch, 3.8L, 6spd, stocker

Offline Jrama

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Re: Stroker motor
« Reply #1 on: November 21, 2017, 09:43:49 PM »
I went with 505 for my 4.6 stroker after my 4.0 went.

They had some issues with their JK stroker motors but that all appears to be a defective supplier not 505 themselves.

For my kit they supplied a few wrong parts...cambolt... stupid 160f thermostat. Some other parts made me guess but they were right about how it all fit together. All in all they knew their stuff well and helped me out when I had questions.

I used DW for machine work and while it was well done it took way too long (months) from their initial estimate of a couple weeks. But i would imagine it is slower this time of year and they could get it done quicker..

There is another machine shop out east of calgary I think its brads? If your  interested I could look into it and confirm.

* I was picky and specifically opted out of paying for a forged piston for a sub 300hp motor, 505 accomodated this request well...

*firebolt engines was the cheapest for any head work a lot and quick.  They rebuild but do not modify. will save you tons of cash on a lot of random parts even paying conversion. Or order through 505 just check before sourcing locally.

Offline hps4evr

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Re: Stroker motor
« Reply #2 on: November 22, 2017, 06:17:07 PM »
If you google the 505 performance 3.8 stroker kit you'll find mostly poor reviews. As Jamal stated the issues may have been resolved but that's a big price to pay to find out.
Swapping in a 4.0L into a Jk would be cool:) but not easy I suspect. If you're planning on the JL diesel in the future it may be best to wait. Tough to spend a bunch of money on an engine upgrade and get very little return on it when it's time to sell. :/
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Offline w squared

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Re: Stroker motor
« Reply #3 on: November 23, 2017, 01:55:27 PM »
If you already have the Minivan Special (3.8) a blower might be the least painful way to add some oomph. It's no LS swap, and certainly not as cool as a Cummins.....but it'll let you merge onto Deerfoot without as much of a pucker factor.
I followed a rainbow out to a garage and found a leprichaun. The rainbow ended in a potted cactus on his porch, but there was no gold :(