post #1 of Old 09-12-2013, 05:28 PM Thread Starter
martinezJ72
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Engine switch

I was wondering how much it would cost to switch the v8 engine i already have in my 72 cj5 to a more efficient v8.

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post #2 of Old 09-12-2013, 06:39 PM
LumpyGrits
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"Efficient"
LG

Have'n you along, is like loose'n 2 good men
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post #3 of Old 09-12-2013, 07:02 PM Thread Starter
martinezJ72
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Right now mine only gets 13 to the gallon snd i want one that gets more
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post #4 of Old 09-12-2013, 07:11 PM
larock
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Get on the ol interweb and look up some engines
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post #5 of Old 09-12-2013, 07:20 PM
LeePrather
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Quote:
Originally Posted by martinezJ72
Right now mine only gets 13 to the gallon snd i want one that gets more
Lol I'm sure everyone on this forum will be interested to see what you find...if you get 13, you might get more than anyone else...

Install some Fred Flintstone pedals...
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post #6 of Old 09-12-2013, 10:26 PM
mattl
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I get 8 mpg if I'm lucky. Danged 'ol AMC's are not known for their efficiency.

A modern V8 swap will cost lots of cash.

1986 CJ7, AMC 360, NP435, D300, Tera60 w/Detroit, D44 welded, SOA, 37" MTR
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post #7 of Old 09-12-2013, 10:32 PM
79CJ7dude
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Quote:
Originally Posted by martinezJ72
Right now mine only gets 13 to the gallon snd i want one that gets more
Oh, what I would give for 13mpg. Lol
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post #8 of Old 09-12-2013, 10:49 PM
WSS
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Quote:
Originally Posted by martinezJ72 View Post
Right now mine only gets 13 to the gallon snd i want one that gets more
I'll take it when your done with the swap.

Someone here with a CJ has a sig that says it right:

"It's the cost of admission"

I just tweaked mine a bit and can probably squeeze 12mpg rolling downhill. Offroad it can use a tank to go 30-40 miles, should we say 2-3mpg?

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post #9 of Old 09-12-2013, 10:57 PM
LumpyGrits
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Save your money.......
13mpg ain't bad for old style V-8 engine.
What ever you spend, will never be recovered in gas savings.
LG

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post #10 of Old 09-12-2013, 11:08 PM
titomars
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Quote:
Originally Posted by WSS View Post

Someone here with a CJ has a sig that says it right:

"It's the cost of admission"
That be me I have a 258 and average 13.2 mpg highway and about 10.5 in town. My engine is far from stock. but even the old stock 258 did not do much better. Our CJ's are about as aerodynamic as a cinder block. After the usual mods also weigh in at an excess of 4000 lbs. gas mileage is not something they will ever be known for.
Attached Thumbnails
258 HO 042612 (2)small.jpg  

1981 Jeep CJ7 4.0 HO, AX-15, D300, D30, D44, SOA
1977 Chevrolet C/10 step side 454 TH400 3.73 posi
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post #11 of Old 09-12-2013, 11:12 PM Thread Starter
martinezJ72
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Yeah. It still has the original engine it was made with. Im gonna put a picture of the engine up tomorrow.
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post #12 of Old 09-13-2013, 12:37 AM
WSS
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Quote:
Originally Posted by titomars View Post
That be me I have a 258 and average 13.2 mpg highway and about 10.5 in town. My engine is far from stock. but even the old stock 258 did not do much better. Our CJ's are about as aerodynamic as a cinder block. After the usual mods also weigh in at an excess of 4000 lbs. gas mileage is not something they will ever be known for.
There it is! Even better said in person. Sweet set up you got there.

WSS
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post #13 of Old 09-13-2013, 08:07 AM
titomars
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Originally Posted by WSS View Post
There it is! Even better said in person. Sweet set up you got there.

WSS
Thanks! The group I wheel with mostly all have YJ's and TJ's. They love to make fun of my little gas hog. hehehe Even though in reality they don't do much better. It's the difference of our tanks mine is 15 gals., theirs 20+ gals

1981 Jeep CJ7 4.0 HO, AX-15, D300, D30, D44, SOA
1977 Chevrolet C/10 step side 454 TH400 3.73 posi
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post #14 of Old 09-13-2013, 01:24 PM
CSP
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Quote:
Originally Posted by LumpyGrits View Post
What ever you spend, will never be recovered in gas savings.
This was worth saying again.

A Chevy LS-series V8 would easily get you in the 20s for MPG if you can keep your foot out of the loud pedal. It would easily cost $4k+. That's a LOT of gasoline.
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