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Unread 11-04-2012, 09:02 PM   #61
Crawlerkid
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http://www.youtube.com/watch?v=YyM55...ature=youtu.be

A few shots of the outside





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Unread 11-10-2012, 07:00 PM   #62
Crawlerkid
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Oil cooler plumbed in, grill tie down brackets made, exhaust made, fans wired in, headlights wired up, vacuum pump plumed in. Soon to be licensed !
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Unread 11-11-2012, 06:16 PM   #63
inovermyhead2
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I love this swap! I may consider taking out my SBC and doing this swap. The nice thing about the mercedes VS. the cummins 4bt or 6.2 chevy or duramax swap is the mercedes is much lighter and smaller. Parts are cheap too and the mercedes diesel is so easy to work on. Maybe you can take some time after the build is finished and do a step by step thread on the swap so we have an "instruction manual". Hats off to you for a job well done. Curious to see what the fuel consumption will be.
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1983 CJ7
350ci Chevy
SM465 Trans
Rancho 2 1/2" lift
Confer Engineering Shackles
32x11.50x15 BFG All Terrains


[QUOTE]whoever invented Torx bolts should be shot in the face, burned then pissed on - saskcj7[/QUOTE]
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Unread 11-11-2012, 08:57 PM   #64
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Quote:
Originally Posted by inovermyhead2
i love this swap! ... Maybe you can take some time after the build is finished and do a step by step thread on the swap so we have an "instruction manual". Hats off to you for a job well done.
x2
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Unread 11-12-2012, 10:02 PM   #65
Crawlerkid
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Hatch glass removed from rusted metal frame, fiberglass frame prepped and hardware switched over, glass swapped in, hatch installed, top sealed and locked down, reinforcement plates for the door brackets made and installed, new bulbs all around, brake lines secured out of the way, and sub/amp/headunit installed haha Gotta have music! (Kicker square 8" with an old school eclipse amp) Gives beautiful mids, to mild lows. Just a nice hum, not annoying.

Took it out in the inch of snow I got here, and stuck my head out the window to see if my tires were cleaning the treads out, and I was greeting with a face full of grassy, muddy snow. Tires cleaning? Check

Don't have any new pics, I go to school from 7-3 and work from 3-5:30 and it's almost dark by then. Looooooong days, I feel like the people forget what it was like to get preached to 7 hours a day, everyday, and you're always wrong no matter what haha

Pumped to get it on the road and start finding everything I've missed, because that's what happens
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Unread 11-12-2012, 10:04 PM   #66
Crawlerkid
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I'll for sure make a new thread outlining the installation of the diesel, and structure it around a "how to."

I will be doing another mercedes swap soon, into either another cj/wrangler or a cherokee
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Unread 11-15-2012, 05:47 PM   #67
Crawlerkid
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Officially on the road! Drove it to school and back and am loving it. I need to get some actual lift springs for the front, as the huge shackles I made threw my caster way out of wack. (I was expecting this.) If someone has some front lift springs to the tune of 2-4" they can let go of cheap, it would really help me out. I also need 4.10 gears for the front and back. The 2.73's I have aren't cutting it.
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Unread 11-15-2012, 06:15 PM   #68
inovermyhead2
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You might want to re think the 4.10's. Diesels do not like to rev. They make their power at lower rpm's than gas motors. You may have to do some calculations to find the right gear set. Start by finding out what is max rpm on the Mercedes diesel you have and at what rpm it makes peak torque/hp. Your motor may only rev to 3500 rpm. Just an example, i don't know that for sure. Utilizing those numbers there are a number gear ratio calculators on the net to figure in your tire size, transmission final drive ratio and match your cruise rpm to your motor. Gas engines don't care much about these things but diesels are very different animals. I'm not saying 4.10 is not the correct ratio , I'm just saying make sure you do the math first. You don't want to have great performance off the line and then over rev the engine on the hwy. you have to find the middle ground with a diesel.
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[url]http://www.jeepforum.com/forum/f8/83-cj7-finally-complete-finished-pics-1429955/[/url]

[url]http://www.jeepforum.com/forum/f8/just-another-83-cj7-build-thread-1325757/[/url]

1983 CJ7
350ci Chevy
SM465 Trans
Rancho 2 1/2" lift
Confer Engineering Shackles
32x11.50x15 BFG All Terrains


[QUOTE]whoever invented Torx bolts should be shot in the face, burned then pissed on - saskcj7[/QUOTE]
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Unread 11-15-2012, 07:17 PM   #69
Matt1981CJ7
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Quote:
Originally Posted by inovermyhead2 View Post
You might want to re think the 4.10's. Diesels do not like to rev. They make their power at lower rpm's than gas motors. You may have to do some calculations to find the right gear set. Start by finding out what is max rpm on the Mercedes diesel you have and at what rpm it makes peak torque/hp. Your motor may only rev to 3500 rpm. Just an example, i don't know that for sure. Utilizing those numbers there are a number gear ratio calculators on the net to figure in your tire size, transmission final drive ratio and match your cruise rpm to your motor. Gas engines don't care much about these things but diesels are very different animals. I'm not saying 4.10 is not the correct ratio , I'm just saying make sure you do the math first. You don't want to have great performance off the line and then over rev the engine on the hwy. you have to find the middle ground with a diesel.
Worth repeating.

Matt
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Unread 11-15-2012, 09:53 PM   #70
Crawlerkid
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Here's some hp/tq numbers with the pump turned up.

Stock: The diesel's max hp is 115 @ 4350 and max torque of 181 ft/lbs @ 2400.

They dub this engine a "short stroke" diesel, because it has a short stroke which is reflected in its low torque #'s and high rpm.

If you let it rev, it will REV! Haha it's 5000-6000 capable with some more pump tuning, but that's not what I'm after. The 33's are what are killing me in the gearing department.
image-4214670135.jpg  
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Unread 11-15-2012, 10:04 PM   #71
inovermyhead2
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1980–1985 300TD Turbo 3.0 L OM617a I5 Diesel 125 PS (92 kW; 123 hp) @ 4350 245 N·m (181 lb·ft) @ 2400

Your peak torque is @ 2400rpm. That is your "sweet spot" for your hwy cruising. You would want to stay + or - 200 or so rpm @ let's say 60mph for best economy and performance.. According to the chart (link below) 3.73 is your best ratio with your 1:1 ratio t4 trans. That gear ratio will work for anywhere from a 31-33" tire and have you at 2400 rpm @ between 60-63mph depending on tire size (Larger tire, higher speed at rpm). If you switch to the AX15 Transmission, you will need 4.56 gearing for the overdrive, or just use 4th gear with the 3.73's.

And yes, it does say it makes a 125hp at max rpm of 4350. Horsepower doesn't mean a thing. It's torque that moves a vehicle. There is an old saying "torque wins races, horsepower sells engines" . A car will accelerate hardest at its torque peak in any given gear, and will not accelerate as hard below that peak, or above it. Torque is the only thing that a driver feels, and horsepower is just sort of an esoteric measurement in that context. 300 foot pounds of torque will accelerate you just as hard at 2000 rpm as it would if you were making that torque at 4000 rpm in the same gear. Therefore, horsepower isn't particularly meaningful from a driver's perspective.


http://manoian.net/jeep/gear_ratio_calculator.html
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[url]http://www.jeepforum.com/forum/f8/just-another-83-cj7-build-thread-1325757/[/url]

1983 CJ7
350ci Chevy
SM465 Trans
Rancho 2 1/2" lift
Confer Engineering Shackles
32x11.50x15 BFG All Terrains


[QUOTE]whoever invented Torx bolts should be shot in the face, burned then pissed on - saskcj7[/QUOTE]
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Unread 11-15-2012, 10:07 PM   #72
Crawlerkid
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Ran it through the calculators

2.73 on the left 4.10 on right

2nd @ 10MPH 659 989
3rd @ 35MPH 1459 2192
4th @ 55MPH 1529 2296
4th @ 65MPH 1807 2713

4.10's look to keep me right in my torque curve

Time will tell
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Unread 11-15-2012, 10:10 PM   #73
Crawlerkid
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Didn't see your post, I'm sorry!
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Unread 11-15-2012, 10:13 PM   #74
Crawlerkid
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I used a different page and got my #'s. Weird
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Unread 11-16-2012, 09:13 AM   #75
Matt1981CJ7
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Crawler,

If you're building an economical DD, that will be more than capable off-road. I think the 3.73s will suit you better. 4.10s will wind pretty tight at highway speeds with a 4-speed.

On the other hand, if want a crawler, that will pop a wheelie off the line, but will be howling at 65 mph, then go with the 4.10s.

Matt
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