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Old 07-06-2017, 09:22 AM   #181
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with a 4.44 rear and 11R22.5's you should be able to go close to 65.. to tach at 2400.. or does the 8.3 not run 2400 RPM?

-Christopher
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Old 07-06-2017, 09:48 AM   #182
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with a 4.44 rear and 11R22.5's you should be able to go close to 65.. to tach at 2400.. or does the 8.3 not run 2400 RPM?

-Christopher
Same thing I calc'ed. I've seen 2500-2900 rpm listed on various sites.

Looks like 3k might be the max?
https://cumminsengines.com/powerspec...and-parameters
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Old 07-06-2017, 09:51 AM   #183
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will it run 65 or do you run out of horsepower? or it just doesnt like to climb hills?
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Old 07-06-2017, 10:24 AM   #184
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The parking brake will be a problem, 643 came out of an air brake truck, my bus has a drum parking brake. My bus also has a 3.90 rear with the same tires as yours
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Old 07-06-2017, 10:25 AM   #185
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will it run 65 or do you run out of horsepower? or it just doesnt like to climb hills?
On flat ground I can run 65 within the 2500 rpm. I've hit 70 but that was over 2500 maybe 27ish. Uphill is where it dies.
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Old 07-06-2017, 12:28 PM   #186
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so you have the right rear gears, just need to have more horsies.. or a 9 speed or such where you would have gears in between the ratios that the 643 gives you..

is a few HP as easy sliding the fuel plate on an 8.3 like a 5.9?
-Christopher
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Old 07-06-2017, 12:32 PM   #187
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... hate money.

Fixed.

643 is only a 4 speed. And maybe in a shortie but there isn't a chance in hell Chris is going to run up the east coast hills that are called mountains in 4th. My bus weighs 20,600 without seats and plywood.
643 is amazing compared to 545. I have both. I don't want to mess with all the electronics and all that. The 643 would give me more power and efficiency, as well as help the 444 run a good bit cooler. My bus already does 75mph so I really don't NEED double overdrive. THe freeway is FAR from me and I never use it. This is a daily driver bus, the shorty. 643, full size tires, and 4.10 rear tires would be great. I already have two of the three, just need to upgrade the transmission sometime in the future.
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Old 07-06-2017, 12:33 PM   #188
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The parking brake will be a problem, 643 came out of an air brake truck, my bus has a drum parking brake. My bus also has a 3.90 rear with the same tires as yours
I'm lucky- I've got hydro brakes and an air parking brake.
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Old 07-06-2017, 12:38 PM   #189
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EC - even just running my 1000 in 4th gear (which is basically running like a 643) is amazing compared to the 545... I dont dislike a 545 bit now that ive driven a lockup trans in a school bus i can see why they are much preferred.. even running the byrd in 4th it ran cooler and didnt max the RPMS completely..

I should look for a 1545 (lockup 545) for the DEV bus.

im wondering if they ever built a 444E with a 643 or anything using an SAE2 bell.. thats the big thing is to be able to find the correct spacers for an SAE2 bell.. it may just be as easy as removing a spacer behind the flywheel.. but i didnt take my flextplate off.
-Christopher
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Old 07-06-2017, 12:40 PM   #190
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I'm lucky- I've got hydro brakes and an air parking brake.

is it an air actuated park brake and there is still a drum on the back of the transmission? or is it a different type parking brake altogether?
-Christopher
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Old 07-06-2017, 12:42 PM   #191
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is it an air actuated park brake and there is still a drum on the back of the transmission? or is it a different type parking brake altogether?
-Christopher
huh... IDK I'll have to look.
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Old 07-06-2017, 12:43 PM   #192
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I looked all over that bus but never payed attention to the park brake
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Old 07-06-2017, 12:45 PM   #193
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Me either, obviously. I'll check next time I'm at Shaun's place to start it up and move it around a bit.
Got another painter buddy coming out next weekend!
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Old 07-06-2017, 12:54 PM   #194
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sucks that painters are such flake-outs.. youve already done the hard stuff.../ they just need to help mask it and shoot it, sounds like
-Christopher
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Old 07-06-2017, 01:03 PM   #195
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is a few HP as easy sliding the fuel plate on an 8.3 like a 5.9?
-Christopher
I saw a post saying to do that while I was looking for the max RPMs. It was from a guy asking the difference between the 210hp and 260hp versions. I already have the 260 version so I don't know if there' more adjustment or more involved. The 880 lbft of torque instead of the 660 would be nice.
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Old 07-06-2017, 01:09 PM   #196
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sucks that painters are such flake-outs.. youve already done the hard stuff.../ they just need to help mask it and shoot it, sounds like
-Christopher
Or buy a gun and call it done.
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Old 07-06-2017, 01:10 PM   #197
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643 is amazing compared to 545. I have both. I don't want to mess with all the electronics and all that. The 643 would give me more power and efficiency, as well as help the 444 run a good bit cooler. My bus already does 75mph so I really don't NEED double overdrive. THe freeway is FAR from me and I never use it. This is a daily driver bus, the shorty. 643, full size tires, and 4.10 rear tires would be great. I already have two of the three, just need to upgrade the transmission sometime in the future.
Find me a 3060 and send Chris up here and you can have him bring my 643 down to you. We both get new trannies and Chris gets a workout. Sounds like a win-win-win to me
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Old 07-06-2017, 01:28 PM   #198
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Or buy a gun and call it done.
I have one, but I'm not as good as a REAL painter, and I want an awesome job to be done as its a daily driver and all.
A qualified person to spray the paint is worth the $$ and the wait, IMO.
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Old 07-06-2017, 01:29 PM   #199
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Find me a 3060 and send Chris up here and you can have him bring my 643 down to you. We both get new trannies and Chris gets a workout. Sounds like a win-win-win to me
Man, that would be awesome!
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Old 07-06-2017, 01:29 PM   #200
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Find me a 3060 and send Chris up here and you can have him bring my 643 down to you. We both get new trannies and Chris gets a workout. Sounds like a win-win-win to me
ha! i'll WIRE it, but you'll have to do the heavy lifting.. a 3060 weighs what like 600 lbs? you can bench it up there while I fumble around tryoing to get the first 2 bolts started..

-Christopher
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