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Old 05-07-2019, 06:18 PM   #81
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super thanks!! I see what they did... mine has 2 belts around the engine, fan, and alternator.. and another belt around the engine, fan, and air brakes compressor.. and then I used the outer groove on my fan for my single AC.. looks like I could pretty much bolt one compressor to the other and pull that redundant belt.. use my 2nd fan groove for the other A/C..



My 1990 E-350 mini-buses had a dual compressor A/C system. The one compressor worked on the Ford through the dash A/C system and the second compressor worked the rear A/C unit (it has been so long ago I can't remember what brand system it was).


The compressor that ran the rear A/C was the first compressor and the through the dash was the second compressor. The first compressor was run off of the engine and the second one was run off of the first compressor. It was set up so that either one or both compressors could be working or not at the same time.



The first compressor looked like a typical Ford A/C compressor mount and adjuster and the second one was hung out past the first one and was tensioned against the first one. IIRC it used a jack screw not unlike the one in one of the photos above.


IIRC, with a vacuum pump and two A/C compressors I think there were seven belts.
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Old 05-08-2019, 08:03 AM   #82
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Thinking of going with a serpentine belt on a dt466 upgrade engine. Perhaps this winter. We will see what happens.
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Old 05-08-2019, 08:13 AM   #83
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Just turn the 360 up, 466 swap isn’t just a drop in, but you can crank a 360 pretty good. First turn the screws and drive it, if not enough then P pump it
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Old 05-08-2019, 08:21 AM   #84
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I don't have to mess with the injection timing?
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Old 05-08-2019, 09:25 AM   #85
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depending on what the original rating is. your timing may be set pretty good.. the california versions had fairly retarded timing. but the 49 state versions were already stock in that 17-20 degree range which is the accepted value from what I read on most of the DT related forums. for all but the guys cranking them way up.

the california versions were at 13. which is a bit low...


turning out the fuel screw is a good way to bump it easily. and see if thats good enough.. beyond that P-pumping is the way to go.. MW pumps were somewhat beefier than the A-pumps that are stock but when you get to that point may as well P-pump.



im not sure what you are going for as a target.. the MT-643 made a pretty big difference in how mine cruises.. it still a bit sluggish on freeway ramps and hills but not near like it was. and I havent turned up the screws on mine yet.. thats something im going to do real soon here..



you can check your timing pretty easily on these.. there is a plug in the side of the injection pump you unscrew (at the front where the gears are)... then you rotate the engine until the marks on the gear and the engine line up.. always rotate the engine in normal direction of rotation..



then there is a timing. pointer that points to the harmonic balancer.. the balancer is marked with lines and numbers.. those will be your injection timing.. where the pointer points on the balancer..


there are obviously other things you can do to turn these engines up in. regards to bigger injectors, turbos, etc...



at some point you still reach the limits of the allison... I wouldnt pump any more than 300 HP through a 643...



if you want to start making REAL power then its time to go get a transmission built (and $$) to handle it...



-Christopher

-Christopher
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Old 05-08-2019, 01:22 PM   #86
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The emissions control info sticker says I have a 190 bhp engine, 82 fuel rate and 16 degrees initial timing btdc. As far as I know, it has not been adjusted. If I could get near 250bhp, that would be enough . . Especially with the 643 trans.
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Old 06-21-2019, 04:28 AM   #87
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Thanks, An Update and a Question . . .

Thank You to all of You who have replied and given advice/opinions on my bus. I appreciate it all.

After getting the front A/C functioning and dealing with loose compressor mount bolts, the belt got glazed from all the slipping. I bought 2 new ones to replace it. Finally got enough time and had decent enough weather to install them. I'm planning on getting the rear A/C system going soon, Perhaps after the Trans swap. Life happens so I haven't done it yet, looking to buy the trans at the end of this month.

I would like to get a quote of bulk insulating headliner material but I need to get a measurement of the ceiling length and width. I can easily measure length. Its the width that is being difficult. If anybody has a way of measuring this or perhaps its standard on all buses?
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Old 06-21-2019, 05:03 AM   #88
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I can't find the notes from when I was figuring my luaun needs to cover the ceiling; but I ran out a tape measure, started at one side, and measured the curve by pressing the tape in place until I got to the opposite side.
It was 8' & several inches wide, best as I can recall, tho not measured from the window tops, but at the lengthwise piece supporting the wiring harness'.
Hat channels are 1 7/8" deep X 1 1/4", with most of the interstitial spaces 27 1/4".
Don't know if this answered your question, but hope it helped.
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Old 06-21-2019, 01:16 PM   #89
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I can't find the notes from when I was figuring my luaun needs to cover the ceiling; but I ran out a tape measure, started at one side, and measured the curve by pressing the tape in place until I got to the opposite side.
It was 8' & several inches wide, best as I can recall, tho not measured from the window tops, but at the lengthwise piece supporting the wiring harness'.
Hat channels are 1 7/8" deep X 1 1/4", with most of the interstitial spaces 27 1/4".
Don't know if this answered your question, but hope it helped.

YES!! It has helped. Thank You for responding. I can easily trim a little but sewing another piece on is another thing. I will have cut outs where the evaporators are on the ceiling. I can use that to insulate the driver's footwell. The sooner I can get it insulated, the better.
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Old 06-21-2019, 01:41 PM   #90
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YES!! It has helped. Thank You for responding. I can easily trim a little but sewing another piece on is another thing. I will have cut outs where the evaporators are on the ceiling. I can use that to insulate the driver's footwell. The sooner I can get it insulated, the better.
Glad to've helped.
Today may be the Summer Solstice for the rest of the hemispere, but I think my calendar must be running slow.
Summer settled in and put up it's feet here in TX several weeks ago...
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