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Old 08-26-2007, 09:15 PM   #1
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stroker?

hust wondering how much hp does one normally see.. if they get their engine stroked?

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Old 08-26-2007, 09:18 PM   #2
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how much does kits normally cost? no labor needed..

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Old 08-26-2007, 09:23 PM   #3
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I've found some neat kits, but don't know how much.
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Old 08-26-2007, 09:35 PM   #4
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Old 08-27-2007, 06:54 AM   #5
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Depends, 4.7, 4.8, 4.9 stroker ? Build it yourself, most expensive part are the pistons. Or you can go with a golem, clifford, bunch of others, we have a bunch of stroker owners on naxja and a few sites that include part numbers and instructions/build tips.
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Old 08-27-2007, 01:52 PM   #6
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http://www.hesco.us/

They have kits that exceed 300hp. I know they can ship a complete, all new 4.7 stroker to my door for around 5300. That includes the aluminum block and puts out about 300hp and 333ft lbs of torque.
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Old 08-27-2007, 02:05 PM   #7
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I was reading somewhere... you can drop in a 4.2L crank and rods out of a YJ and end up with a 4.5L. Of course you'll need a custom map adjusting sensor to compensate for the increase in displacement.
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Old 08-27-2007, 05:30 PM   #8
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AzTJ how about one of those "performance chips" that throw some more fuel in there?
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Old 08-27-2007, 05:32 PM   #9
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They really aren't worth it.
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Old 08-27-2007, 05:47 PM   #10
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Quote:
Originally Posted by AzTJ View Post
They really aren't worth it.
I ment after you "stroke" it instead of a new mass sensor to add more fuel?
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Old 08-27-2007, 07:48 PM   #11
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I didn't say mass, I said MAP. Completely different. And no, still not worth it.
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Old 08-27-2007, 08:43 PM   #12
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ok nvm
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Old 08-27-2007, 09:29 PM   #13
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The below setup will run on 87 octane, and provides more torque, but the engine would have to be bored .030:

4.6L Low-buck, low CR "rockcrawler"

~ Jeep 4.2L 3.895" stroke crank
~ Jeep 4.2L 5.875" rods
~ Keith-Black Silvolite UEM-2229 +0.030" bore pistons
~ Increase piston dish volume to 30cc
8.8:1 CR
~ Crane #750501 192/204 degree camshaft
~ Ported HO 1.91"/1.50" cylinder head
~ Mill block deck 0.035"
~ Mopar Performance 0.043" head gasket
~ 0.058" quench height
~ 2.25" exhaust
~ Stock injectors with stock 49psi FPR for '96 and later engines
~ 231hp @ 4400rpm, 327lbft @ 2000rpm

Another stroker writeup:

http://www.rockcrawler.com/techrepor...er40/index.asp

This combination is supposed to work with the stock computer and injectors.

You will note that hp is only approximately 40 hp higher than a stock 4.0 liter, but look at the torque. Torque is up about 90 ft-lbs and it comes in 1200 rpm lower than the stock engine is rated.

This is what an increase in displacement does for you - torque increases and it increases at a lower engine speed. This is what you want in a Jeep. This would be no more difficult to do than a stock rebuild and should perform like jack the bear in a Jeep.

I have not tried this combo, but after researching it, I think it should be a good one.

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Old 08-28-2007, 07:46 AM   #14
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Hell yeah.. I know what I am gonna do whenever my 4.0 dies.. that article is very well thought out... right down to his methods of collecting data and how much better the stroker is than stock.
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Old 08-28-2007, 10:48 AM   #15
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Here is one the NAXJA build up's.
http://www.jeep4.0performance.4mg.com/

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