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Unread 04-20-2002, 01:01 AM   #1
LoOpY
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Engine Upgrade

Aight Guys, Ive got a 95YJ and Im pushing my 33s with my stock 4 banger (Boo, Hiss, I know). Of course ive got little acceleration, and a top speed of about 60mph. From what i understand, my 4.11 gears would be perfect for 33s with a 6 cylinder. This is a road/offroad jeep, so id like to have some fuel efficiency, hence the preferance of a 6 over an 8. To get to the question, what do you guys think i should look into? Ive been reading that chev and buick v6s are both good swaps, but what about the jeep straight 6s? Any pros and cons that im missing here? cause i was brought up with a bowtie around my neck, and am kinda partial to my dads 4.3L Blazer. Well, thanks for feedback!

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Unread 04-20-2002, 02:53 PM   #2
4wheeler4CJ
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Personally, LoOpY,

I would take an Inline Jeep 6 over a Chevy 4.3 any day of the week. My friend has a 4.3L Vortec in his '94 4DR S-10 Blazer with abot 80,000 on it. I have the 4.0L Inline HO in my '96 Cherokee Country with 92,000 miles.

He admits up and down that his engine has been problem after problem, and that my XJ has much more power than his Blazer. Also admitted that he liked my 4.2L in my old '77 CJ-7 better, LOL. He still as his Blazer, but bought a Toyota Tacoma because he couldn't depend on his Blazer for everyday use, and wanted a pickup also.

My opinion, you won't go wrong if you swap in a 4.0L Jeep motor, and it'll be an easier swap (for obvious reasons). <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-22-2002, 02:47 AM   #3
Mr. Mopar
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V6 tends to have more hp , and I6 tends to have more torque. go with the I6 dude you want torque in a 4X4.
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Unread 04-22-2002, 09:12 AM   #4
Jeepfreak81
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the v-8 wont lose much over the 4 cyl... i have a 4 cyl and get 15-18 and i talked to a guy that has a chevy v-8 700R4 trans -- it had TPI injection, and he got 23 mpg! and i have also talked to a few online with carburators and they get the same as i get if not better with the v-8, its the power to weight ratio i beieve... i will be doing the Chevy v-8 swap myself
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Unread 04-22-2002, 10:22 AM   #5
chuckd98036
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I have been asking myself the same question for a few months now and after a lot of research I have chosen the I6. Heres why,
1. I jeep 6 has almost as much horsepower and more torque.
2. With the 4.3 you need a different transmission and transfer case or you can buy and adapter from advance adapters for $500 which will allow you to use the stock jeep t-case and a different tranny which would work with the 4.3.
3. Theres enough after market parts for the 4.0 to get the same horsepower as the 4.3.
4. the 4.0 is a lot easier to find then the 4.3 vortech and a lot cheaper.

I just bought the entire 4.0 drivetrain two days a ago from a guy whos putting a 350 in his and I got a great deal on it, way cheaper than my estimated costs for the 4.3 swap.
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Unread 04-22-2002, 12:49 PM   #6
4wheeler4CJ
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Also, remember, Horsepower alone doesn't make the engine perform well. The 4.0 with slightly lower stock HP will blow away the 4.3 because it has higher stock Torque. And, I do mean blow it away, I have raced my friend's 4.3 Vortec 4-DR Blazer (comparable vehicle size), and toasted him (comparable miles on engines, too!).

As far as the V8, most V8's do get better HP in the Jeeps than the 4-bangers. Jeepfreak mentioned, it is the power to weight ratio, but it is also largely the type of vehicle we are talking about. The type of drivetrain in the Jeeps is simply suited for a larger motor. Less effort to push it around, therefore efficient use of horsepower/torque. Not true with the 4-banger.

So, go with the Inline 6 or a V8. My '77 listed below sports a '72 AMC 360 V8, and it's a friggin beast! Inline 6 will be an easier swap to your particular vehicle, though.
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Unread 04-22-2002, 03:38 PM   #7
LoOpY
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Thanks for the input guys! After more thinking and talking with buddies i am leaning towards the I6 now. The transfer case was something i hadnt really thought about. Also you guys confirmed somthin that i believed for a while now, that i could probably get better mileage with a larger engine for the simple fact that my 4banger hasta try TOO hard. As soon as i get the damaged front end pounded out/replaced ill start lookin for engines, and ill also throw a pic of my baby up on the forums!
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