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Old 10-23-2005, 10:07 PM   #1
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I6 Stroker

I'm a noob, and I'm interested in a new engine. I've been lookin' at several options, and am most interested in the straight six stroker. Can it be carbureted, or does it have to be fuel injected? How much would it cost to get all the different pieces yourself and put it together, or is it just plain easier to get it put together for you? Any info is much appreciated.

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Old 10-24-2005, 05:48 PM   #2
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Everybody is a noob at one time or another. I do not know a whole bunch about the stroker kit. I did a little research once, but that was a while ago. Check out Clifford Performance. They are the one of the best companies out there for building I6's. Most of their stuff is for racing only, so be aware of local laws. Man was that hard to say.

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Old 10-24-2005, 09:23 PM   #3
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there isa guy here in australia that has not so long ago stroked his engine to a 4.7l
go to www.ausjeepoffroad.com and do a search on stroker kit his forum name is madbuga also a guy called gordo.. search stroker under either of these names and your sure to come up with something.
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Old 10-24-2005, 09:34 PM   #4
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Thanks, I'll be sure to read up on that site.
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Old 10-25-2005, 07:39 AM   #5
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try golan engines they are making stroker sixes that are puttin out V8 numbers
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Old 10-25-2005, 11:36 AM   #6
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Golen does make some great ones, too bad the price is about the same as their V8s.
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Old 10-25-2005, 12:47 PM   #7
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There are a few sites on building one. rockcrawler.com has one that will give you some basic info.

The basic 4.0 stroker is a 258 cam & rods and 4.0 pistions. As you bore out the cylinders you'll have to upgrade the injectors and do some work with the map sensor as well as air in and out of the engine. At .060 over you'll have a 4.7

The following pages have more detail.
http://www.rockcrawler.com/techrepor...er40/index.asp
http://www.angelfire.com/my/fan/stroker.html
http://www.jeep4.0performance.4mg.com/stroker.html

How bout a 5.0 out of a 4?

5.0L Very high-buck stroker - bet this sucker warms up quick....

4.06" offset-ground stroker crank
Jeep 4.2L 5.875" rods
Small Block Chevy UEM-KB142 hypereutectic pistons
11.1:1 CR
Crane #751111 238/248 degree solid lifter cam
Ported big valve 2.02"/1.60" cylinder head
OEM 0.051" head gasket
0.038" quench height
Flometrics F&B 68mm billet TB
3.0" exhaust system
Ford 30lb/hr injectors with adjustable FPR or MAP adjuster
Custom PCM programming
328hp @ 5250rpm, 375lbft @ 3800rpm
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Old 10-25-2005, 11:23 PM   #8
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How high buck is very high buck? Thanks for the sites man, I'll be reading those in the near future...football ends this friday night. =[
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Old 10-26-2005, 06:44 PM   #9
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Quote:
Originally Posted by yj_1988
How high buck is very high buck? Thanks for the sites man, I'll be reading those in the near future...football ends this friday night. =[
For something like that probably like 4k or 4500.
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Old 11-05-2005, 01:17 PM   #10
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Quote:
Originally Posted by yj_1988
Golen does make some great ones, too bad the price is about the same as their V8s.
Any stroked I6 is going to be that price or more. Hesco and Clifford are the top two in building serious I6 engines, with Hesco having been selected by Mopar to build all their racing and performance I6 engines, along with a slew of hi-po aftermarket parts for the I6 Mopars, including the MPI conversion kit for Mopar.

If you are "sensitive" about the price in any way, don't even look at stroker I6s. Even if you do the work yourself, the parts alone will normally set you back well over $2000.

If you want more hp than you have, just get a low mileage 4.0L hi-po engine out of a '92-'95 YJ at the JY. You should be able to pick one of those up for $800-$1000 in good shape. Remember to get the wiring harness and the ECU at the same time.

Eliminates the Carter BBD (you REALLY want to do this) and replaces it with the MPI system AND you get better heads, more flow, better mileage and better overall performance.
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Old 11-07-2005, 08:10 AM   #11
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I'm not sure what you are getting for mileage, but my HO 4.0L gets about 16-17mpg in the city and maybe 18 on the hwy. These numbers never change either. Whether pulling a trailer, off roading, dogging it, doesn't matter. I didn't really consider that good mileage, but the performance is awesome. This engine has enough torque with the stock gears to pull a house.

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