4 cylinder cjs
craveman85
Jeeper
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- Dolgeville ny
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
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4 cylinder cjs
- Thread starter craveman85
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Torxhead
Always Off-Roading Jeeper
This guy here made quite a few improvements to a 4 cyl. YJ years ago, hope it can help:
Popular Modifications
I really like to see the simplicity of a four banger under the hood of a CJ.
Popular Modifications
I really like to see the simplicity of a four banger under the hood of a CJ.
daddyusmaximus
Senior Jeeper
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- Remington
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- '80 CJ7, Just a rolling frame right now... will have Mopar 360, Torqueflite 727, D20, full size D44, Chrysler 9.25 with 4 wheel discs. SOA on Rubicon Express 1.5" YJ springs.
My first CJ, a '69, had the 4 banger. I like having more power, and I love the sound of a V-8, but that little Jeep went everywhere I pointed it.
Belizean
Always Off-Roading Jeeper
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- 84 CJ7 4 banger-owned since new in 1984 bought off truck at dealership - rebuilding 258, T176 with Sniper EFI D300 4:1 Lomax gears Twin Sticked 1 piece axels with locker
I have the AMC 4 banger in mine since new with 235K miles and still working great. Best things I ever did was the Webber carburetor at 90K and the MSD at about 210K and wish I had done that far sooner. I'm working on a AMC 258 i6 / 4.2l rebuild and hoping to do EFI with that. Sorry no posted pictures haven't figured that one out yet. Scrambler forum works good at that. Only time I really need the 6 cyl would be a little bigger tires and going down the interstate
craveman85
Jeeper
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- Dolgeville ny
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
Here's mine when I got it. I keep changing my mind about what I wanted to do with it. I keep wanting to make it all original. Not a prefect restore but close. Had the GM 151 /SR4 . It needed a repaint and some kids destroyed the motor. I just bought a rebuilt short block with a3 year warranty shipped for under 500$ nobody really wants them anymore. I have a Weber carb upgrade, a hedman long tube header, and a comp cam complete kit for it. I'm buying a rebuilt head off eBay for a newer s10. I'll have better flow and a small bump in compression. Currently looking into better manifolds than oem. Might even make something myself. I don't need the radical 4 barrel race intakes.
Belizean
Always Off-Roading Jeeper
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- 84 CJ7 4 banger-owned since new in 1984 bought off truck at dealership - rebuilding 258, T176 with Sniper EFI D300 4:1 Lomax gears Twin Sticked 1 piece axels with locker
Nice looking!
craveman85
Jeeper
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
Hoping to go from 80hp to 100 hopefully
Belizean
Always Off-Roading Jeeper
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- 84 CJ7 4 banger-owned since new in 1984 bought off truck at dealership - rebuilding 258, T176 with Sniper EFI D300 4:1 Lomax gears Twin Sticked 1 piece axels with locker
I really don't know what the horsepower on mine was, but I just looked up the AMC 150 and it said 105 hp. I don't think I have lost much power over these years. I know the Webber ad at the time said up to 20 percent more power and I think I got that. Original carb was terrible I that much for sure.
craveman85
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
I think my 100hp goal is a little conservative. I'll probably be closer to 120 but I'm not setting myself up for disappointment.
Torxhead
Always Off-Roading Jeeper
I see you do list 3:73s on your CJ, and think that is a little tall for a four banger. I do believe the later CJs with that engine came with a 4:11 ratio. That does put the freeway rpms on the high side though. My point is that changing the gear ratio will give your CJ a little boost on the low end. Along with keeping the overall weight down where you can like don't put a set of 35" tires on it.
craveman85
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
I'll probably keep 373 unless I do swap the Transmission for a 5 speed. For the cost it's not worth it to change to 410s as I'll see mostly street usage. Off road I can use low range. I'll be using 30x 9.5 for now. If I go 5 speed it will probably be 4.56 and 31 or 32.
Hedgehog
Always Off-Roading Jeeper
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- -1975 Jeep CJ5, 360 V8, Headers, Duel Exhaust,T15 transmission, D-20 Transfer case, Twin Stick Conversion, Warn 8274 Winch
-1951 Willys Wagon, 4 cylinder, "F" head, little rust, very close to stock
Using 30" tires should be great for your 4 cylinder engine. I ran 31's with mine with no problems and that was with 2.72 gearing. 3.73's should make for very decent off road power.
craveman85
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- 1981 cj8, gm 151, sr4, Dana 300, Dana 30, amc 20, 3.73s
I don't know how anyone could buy a vehicle with less than 3.54 unless they never test drove it. Or it had 25" tires.
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- '85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
People bought'em, because we had no choice in some states. My only choice was 2:73 or 3:31 w/6cyl engine.
LG
Hedgehog
Always Off-Roading Jeeper
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- Tucson/Marana Arizona
- Vehicle(s)
- -1975 Jeep CJ5, 360 V8, Headers, Duel Exhaust,T15 transmission, D-20 Transfer case, Twin Stick Conversion, Warn 8274 Winch
-1951 Willys Wagon, 4 cylinder, "F" head, little rust, very close to stock
I bought my first CJ5 from a friend. It being a 1980 model, it had 31x10.5's General Grabber tires, SR4 Transmission , 2.72 gears, Dana 300 Transfer Case and a GM 151 4 cylinder Iron Duke engine. We hunted a lot in that CJ, it was great fun. I guess I was to ignorant to know it was one of the worst combinations jeep ever produced. That CJ served us well. He sold it to me and I enjoyed it for several years until the engine and the SR4 got tired. They were replaced with a Buick 331 V6 and Ford T-18 . That jeep was GREAT, even with 2.72 gears. .... I was just to ignorant to know how bad it was. My first child required the CJ to be replaced by a Trooper II. I still miss that jeep. Keep the tires a reasonable size and even 2.72 gears aren't all that bad.