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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 10-18-2007, 10:03 AM
Dayle Moyer
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Smile v-6 or i 6

Question for all of you that have had jeeps for years. If you rebuilt a 231 v-6 and a 258 i-6 totally stock and put them in the same exact jeep, driving over the same roads which would get the best gas mileage. I have a tired i-6 and a tired v-6, need to rebuild one or the other. Any ideas. Thanks for the help.
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post #2 of (permalink) Old 10-18-2007, 10:08 AM
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While much less knowledgeable than most on this board, I would expect better fuel economy from the V-6 and better power and torque from the I-6. So it would depend on priorities as to which I rebuilt.
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post #3 of (permalink) Old 10-18-2007, 11:47 AM
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I am going to get pelted with rocks,,,, but I believe the 231 buick is an awsome motor that recieves very little praise. I have ran them for years and the first engine I ever rebuilt was a 231 od fire,, now stay away from the odds,,, cause they are not as desirable as the even fire ones. As for fuel mielage I have no idea.

Ya only go around once, best to enjoy it the first trip.
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post #4 of (permalink) Old 10-18-2007, 01:38 PM
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The odd-fires, like the earlier 231 or 225's have lots of low end torque - even lots of torque at below idle speeds - impressive.
They also have a fairly flat and even torque throughout the entire RPM range, unlike other motors.
The "odd" firing sequence gives it to them.

Side notes - the odd-fires have run at Indy several times - they had pretty good showing, but no wins. They can be made into awsome engines - with lots of work.

And - there's still an odd-fire that holds a land speed record in it's class.

Kenne Bell has lots of goodies for them.
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post #5 of (permalink) Old 10-18-2007, 02:34 PM
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Rrich do you have a web site for Kenne Bell I can't find anything but wanted to see what they offer for mine.

Ya only go around once, best to enjoy it the first trip.
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post #6 of (permalink) Old 10-18-2007, 03:56 PM
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Kenne Bell Web Home

product list doesn't show anything for that old of a vehicle though.....i know they made some in the past though

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post #7 of (permalink) Old 10-20-2007, 01:58 AM
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I think KB has moved on from their love affair with the Buick V6. Sad, too- their stuff was some of the best.

Randy S.
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post #8 of (permalink) Old 10-20-2007, 04:05 AM
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You might try calling them. Just because they no longer have it on the internet doesn't mean they don't have it.
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post #9 of (permalink) Old 10-20-2007, 07:37 AM
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As to your economy question, the difference will almost surely be insignificant. The engine converts chemical energy to mechanical energy. How much chemical energy it consumes is proportional to how much mechanical energy you ask it to put out. The only difference between a V6 and an I6 would be the difference between their efficiency ratios (amount of mechanical energy produced divided by the amount of chemical energy put in) Quite a few years ago automotive engiines typically were about 40% efficient, IIRC. As long as both engines are built for utilitarian use - yours are - are similar in size - ditto - and design age - advantage 258 - they'll have similar efficiency ratios.

But if economy is a big concern, rebuild your 258 and put a modern fuel injection system on it. That will get you a significant increase in efficiency, although it might not be enough to pay for the FI in a reasonable time..

EVERYTHING's easy for the guy who doesn't have to do it.
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post #10 of (permalink) Old 10-20-2007, 10:49 AM
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In my experience, the 258 will deliver better torque. This might result in better economy, if you keep out of the go pedal. Economy is just a way of maximizing your dollar...in that case the cheapest and easiest would probably be best. If it came with a v-V6, stick with the V6. Likewise, if it came with a I6, stick with that. Year plays a part, too- V6 for pre 72, I6 for 72 and newer. The pre72 front was shorter, hence V6's stock, 72 and later were 4" longer and I6's were stock.

Real world experience?

94 Cherokee, 4.0L- 18 mpg without trying too hard, and has adequate power.

00 Wrangler, 2.5L 4 popper- 20 mpg, gutless.

Here's where it gets interesting....

70 Jeepster, 231 V6- 15 mpg higway if I drive 55 and accelerate like a little old lady. Not much power unless I'm high in the rpm's where mileage goes to crap. Keeping up with "the flow", accelerating normally, I get 12!

82 Scrambler, 350V8- 16 mpg driving normal, and enough reserve power to break stuff at will. That's with a carb and no overdrive. I'm building a FI setup/overdrive trans setup for this one.

I'm a firm believer that in real world driving, if you have more power than you really need, you'll get better economy than taking a smaller engine and working it hard to keep up.

Randy S.
It's not what you buy, It's what you build
82 Scrambler 5.3/4L60E/241OR/D44&HD20 4.56/lockers
1999 XJ Cherokee
1973 VW Bus

Last edited by Randyzzz; 10-20-2007 at 10:52 AM.
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