Re: 4.0 -again

[farna@xxxxxxx]

You don't have to use an electric fan (though I recommend it) -- you can always replace the water pump and use a "reverse rotation" fan from a GC, Wrangler, or aftermarket (they make aftermarket reverse rotation flex fans now). If you find a one piece plastic reverse rotation fan it can be drilled to fit the XJ water pump and a spacer made for it. Just make sure everything is centered! You can eliminate the fan shaft on the XJ AC mount and belt around it with a shorter serp belt, that's what I did after a bearing on that shaft seized (during a trip, naturally!). 

I can tell you something else -- don't go with the 4.6L stroker for gas mileage. I got 2-3 more mpg with the stock 4.0L than with my 4.6L. Of course I have 50-60 hp and about 70 lb/ft more torque -- comparable to a 73 360/4V/dual exhaust (360 = 220 hp, 315 lb/ft; 4.6L = 245 hp, 280 lb/ft; 360 single exhaust = 195 hp, 220 lb/ft). The 91+ 4.0L is rated at 190 hp, 220 lb/ft, about the 360/4V/single exhaust, so there is still plenty power there. The 4.6L is about 1/2 second faster on a drag strip in the same vehicle. That's a lot on the strip, but hardly noticeable during normal driving. It sure isn't worth the 2-3 mpg now! Of course if you need power for pulling, the stroker's torque comes in about the same as the stock 4.0L -- 1800 rpm or so -- depending on cam choice. You can't beat it for low rpm pulling power! 

I average 22-23 mpg on the highway at 65 mph. Pop that up to 70-75 and it drops to 20 mpg. Overall average is 19-20. With the 4.0L I was getting 23-24 mpg at 70-75 and averaging 21-22. This is in a 63 Classic wagon with a couple hundred pounds of extra equipment -- about 3700-3800 pounds of car. Mark's American is appreciably lighter (nearly 1000 pounds lighter) and should perform a bit better than my 4.6L, especially in the mileage department. Plus he has a five speed, I have the AW4 auto. I expect he should average 26-28 on the highway and 23-24 overall. I'd drop a stock 4.0L in an American or Hornet et. al. in a minute!! Keep the EFI -- you'll lose ANOTHER 2-3 mpg with a carb. 

On September 8, 2005 mail@xxxxxxxxxxxx wrote:

> Wrangler and Grand Cherokee have centered belt driven fans.
> Small Cherokee has an offset fan and will need to be replaced by an electric.
> Otherwise the belts and pulleys will all clear in an American, Been there,done that!
>   If you go to a carb you can use a original distributer if you wish. I'd recomend at least a pertronix upgrade over the points, but to each his own.
>   The stock rad placement is fine if you geta thin enough electric fan.
> I used pacers and moved my rad forward on the front side of the core support just because I had an older electric fan that needed extra room.
>   I would recomend using the Fuel injection and all including the trans from the 95 it is exactly the vehicle you need to do this swap. You will not regret doing the full swap once it is done. It is well worth the work. Ou will end up with a car that runs like it has a small V-8 in it and gets between 20 and 30 mpg! No matter how hard you drive it!
>   I wouldn't go back to a carbed six for anything!
>   Read some online from others about this swap. Do a web search.
> Don't forget to change the oil pan and pickup to a 258 car pan and pickup!!!!!
> You don't want to use the 4.0L pan. It is too deep and will hit everything on the road!
> I learned the hard way, So did Frank S. !
> 
> Mark Price
> mprice@xxxxxxxxxx
> Morgantown, WV
> 69 AMC rambler, 4.0L, EFI, 5 speed
> 65 Ambassador Conv, 327 AUTO, Basketcase
> 65 Ambassador 990H flood victim parts car!
> 01 S-10 CREWCRAP 4X4
> 
> 
> 
> ---------- Original Message ----------------------------------
> From: speedyjeeper@xxxxxxxx
> Reply-To: mail-From-mprice-westco.net@xxxxxxxxxxxx
> Date:  Thu, 08 Sep 2005 09:12:01 -0400
> 
> >Thanks for the info.  I found a running 95' 2wd jeep with 4.0L auto.  will that auto trans work?  If I left all the stock 4.0L pulleys/pump/fan etc intact would it work ok with the 68'  American rad placement?  what about using the old distributer? thanks frank
> >
> >


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