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Unread 08-08-2009, 10:33 PM   #1
JeepsOLot
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Mileage for a '60's CJ with a Perkins diesel?

Just curious, if anyone has even done a mileage check on one of these. They are so rare, I wonder how many of these still have their original motor.

Jerry

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Unread 08-08-2009, 11:14 PM   #2
KMD
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I don't know but I love the sound of a Perkins.....
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Unread 08-09-2009, 05:40 AM   #3
GPER
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Met a guy at the last Jeep meeting in Springfield that put the 4 cylinder Cumins in his CJ-5 and he was getting 28 mpg.
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Unread 08-09-2009, 10:04 AM   #4
Pathkiller
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Quote:
Originally Posted by GPER View Post
Met a guy at the last Jeep meeting in Springfield that put the 4 cylinder Cumins in his CJ-5 and he was getting 28 mpg.
Apples and oranges. The Perkins is not in the same ballpark with a turbocharged Cummins.
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Unread 08-09-2009, 09:37 PM   #5
carnuck
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How about Mercedes 300TD?
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Unread 08-10-2009, 06:11 AM   #6
Jeepdoc78
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I've got a 62 CJ5 with the factory Perkins still in it. It still runs great but I just put plates on it last week so I'm not sure what the mileage is yet. Give me a few more weeks of driving it and I'll be able to give you an mpg estimate.

-Dean
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Unread 08-10-2009, 10:32 AM   #7
iagmc
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Assuming a lot when you say cummins is turbo charged, not all "b" engines are turbo, all depends on where the engines life was, and what gears, tires, etc. 28 is very possible with the right setup. I drove a dodge daully with a work body, chipped and got 26 on diesel/bean oil mix.
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Unread 08-10-2009, 12:15 PM   #8
Pathkiller
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Quote:
Originally Posted by iagmc View Post
Assuming a lot when you say cummins is turbo charged, not all "b" engines are turbo, all depends on where the engines life was, and what gears, tires, etc. 28 is very possible with the right setup. I drove a dodge daully with a work body, chipped and got 26 on diesel/bean oil mix.
Regardless, it's entirely beside the point. The topic is "what is the MPG of the FACTORY-INSTALLED Perkins diesel in a CJ-5?" Not "what is the MPG of some various other diesel engines people have swapped in."
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Unread 08-10-2009, 01:35 PM   #9
xeroOTG
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Its not so much the fact that a Perkins is so much different from a Cummins, its the fact that a 4bt displaces 4l. Cummins is famous for 1l per cylinder. Another thing is, if i remember right, 4bt stands for 4 cylinders, b series, turboed. The perkins at hand here is a 192, 3.1L, 16:1 compression (low) at a grand total of 62 hp. Not a real beastly engine. The smallest 4bt i could find was 3.9l, 105hp, 17.5:1 compression. The 4BT is larger, 48 cubic inches, and has a larger compression ratio. Because it has a) a turbo, and b) a higher compression ratio, it burns the fuel more efficiently. Horsepower differences make the 4bt a more efficient engine in general because it has additional horsepower to drag the jeep around with. An underpowered engine will suffer in the gas mileage sector of performance. So, basically saying one diesel swap is similar to another diesel is a bad practice. anyone correct me if im wrong.
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Unread 08-14-2009, 12:24 PM   #10
xeroOTG
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Any news on the mileage? im personally cureous...
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My jeep gives a whole new meaning to the phrase, Just Empties Every Pocket!

1975 Jeep CJ5 258 TBI EFI, T-18, D-20, D44 rear, 4.11.
1992 Jeep Cherokee 4.0L, AW4, NP231 October 2009 - August 2012
1998 Jeep Cherokee 4.0L, AX15, NP231 - August 2012
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