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General Forums => The Mess Hall => Topic started by: hopp on January 30, 2006, 08:04:35 PM

Title: 2.5l stroker revisited
Post by: hopp on January 30, 2006, 08:04:35 PM

Building on the earlier stroker thread on this board;what about the following combinations.

block bored .060 over
crank journals offset ground to 1.97" dia and hardened--but not a straight off one side offset ground--an offset ground with a stroke of 3.55"
2.4l dodge rods 5.945" length
custom pistons with .8271" pin (or stock piston w/bushing?)

Resulting displacement would be ~172 CI
I'm not sure of the feasibility of grinding the 2.5L crank down that far or of the width of the 2.4l rods.


Another combo I was kicking around is as follows:
block bored .060 over
crank journal straight offset ground to 2.000" (3.606" stroke)
(6" sbc rods and 2.5L piston with .083 milled off piston dome)
or
(5.9" sbc rods and the block .015" decked)

This combination would also net about 175 CI but would of course require aftermarket rods. However I think a slightly longer and otherwise stock sbc rod should have a .9281 wrist pin 1" pin end width and .940" big end width;I believe these are the same as AMC 150 parts.

Any ideas?

This might be beating a dead horse but there has to be a cost effective way to make this engine bigger.

Title: 2.5l stroker revisited
Post by: chrisfranklin on January 31, 2006, 12:58:45 AM

You'd expect these guys to put out this kind of supercharger kit for Wranglers, too.  It runs $2200 (vs about twice the price for some kits for Jeeps) and the compressor sits where an A/C compressor normally would. (in my case, I don't have A/C, so I have space for the install).  I personally would be more interested in this due to seeming ease of install & DIY without machine-shop (I'm not going to say that doing a stroker on the 4 looks like a heartattack. But, if you got the skillz or the cash could be worthwhile).

Link apparently shows an XJ 4.0:
http://www.xj-armor.com/supercharger.htm

Title: 2.5l stroker revisited
Post by: Jeffy on January 31, 2006, 12:47:54 PM

Well, the hard part is mounting the compressor and routing the tubes.  But they have that covered.  4.0L alternator mount is the same as the 2.5L.  Would mean that you could mount the compressor in the 2.5L but you'd still have to figure out air/fuel management.

I notice that engine is a Renix. It's doesn't use the standard AC/alt mount.  I think it would be pretty straight forward to mount one to a >'91 setup.  Would be easy to remove too.  If I had more cash and access to a welder, I'd try it.

Title: 2.5l stroker revisited
Post by: chardrc on April 24, 2006, 05:59:34 PM

man i keep on finding these trubos and superchargers for jeeps like this but i have a 1990yj so they dont work cuz they for 91 and up....arrrr...

Title: 2.5l stroker revisited
Post by: MA2LA on April 24, 2006, 07:18:34 PM

ya a stroker seem like alot of work but if you have emissions ita alot easier to get it through than a forced induction system al thought there are some carb leagle kits

Title: 2.5l stroker revisited
Post by: chardrc on May 16, 2006, 04:08:06 PM

ya we used to have emetion testing in minesota but they stoped a few years Back... big reliefe.

Title: 2.5l stroker revisited
Post by: creepyjeepy on May 23, 2006, 10:56:30 PM

if there was a way around smog/DOT issues, i'd go for the international harvester 2.8L TGV diesel.  weighs 450 lbs., i can't recall the hp and torque numbers but they're pretty good.  and think of the biodiesel!

Title: 2.5l stroker revisited
Post by: supryj4 on June 10, 2006, 09:26:21 PM

I was talking with bennie from hesco and he said that in the early 90's they were using the dodge 2.2 turbo rods with nissan flanged rod bearings I not sure what crank they were using but he had all the details I am sure if you called him he would share the info on how to stroke the 2.5.