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Found 7 results

  1. Doppelkupplung

    Best sounding buses

    This is SUPER geeky, but I had to make it. I'm sure I share this with some of you out there, older and younger members, but the way a bus sounds is very important to me. Certain things can make me love or hate a bus, and sound is pretty much at the top of the list. Be it an awesome sounding axle, a dirty exhaust or a savage jake brake, it always helps. Now being a younger and inexperienced member I know that my interests are tailored towards newer buses, Cummins ISL/L/9/M/X/B etc., and even the DDS50/60 etc, (that's about it; anything older I genuinely dislike, especially the 6V92), but I'm curious to hear what your interests are when it comes to sound. To each their own opinion, so post videos or comments of your favorite sounding buses. As a matter of fact, I listen to audioclips of good ones while I work; it really helps. I'll start us off with a few: As you may know, or be able to tell, I'm a ZF fanboy, so here are a few. Listen with bass on if can: First pull off: I've recently discovered a popular French bus, Heulizez, which makes the GX337h, which sounds quite punchy. Listen from 3:29: And we can't forget Allison. Love the shifts into 5th and 6th on these things, never disappoints: from 0:54 to 1:30: Let's hear what you've got!
  2. Since I haven't found any good thread to put this in (as this pretty much applies to any vehicle with an Allison transmission), I'll start this thread here and hope somebody has an answer. Today I came across this document on the web: https://freightlinerads.azureedge.net/ShiftSelector2013.pdf It shows how to use the familiar keypad I've seen on many buses I've been on. In particular, I've noticed the so-called "5th Generation Electronic Controls", which has the high-res, dot-matrix graphical display, looks different from the one I've seen on vehicles in the GTA like GO Transit's latest D4500CTs and Enviro500s (and even retrofitted to its old coaches, such as this one below): https://1drv.ms/i/s!AgqCsfFShZgBidkZJejIlrCELE77CQ As you can see, despite the crappy resolution of my image, the typeface used to display the transmission speed looks different from the one in Allison's PDF document; while the latter shows crude-looking numbers, the ones I've seen use the beautiful-looking Arial font. I believe this could be attributed to one of Allison's OEMs, as quoted in the document: Is this so, and if it is, does anyone have further information about who made the shift selector seen in my image?
  3. I am sure most of you know about the Allison HT740 and HT747 transmissions, but the lower-rung MT644 and MT647 are not quite fondly as remembered. These share some of the same parts, such as torque converters. The MT644 was designed for engines up to 300 hp and 780 lb/ft of torque, whereas the later MT647 ups the input torque rating to 950 lb/ft. But for transit buses, these ratings will be different; for now I know the input hp limit for bus engines is 250. The MT648 was the electronically-controlled equivalent of the MT647. Torque converter ratios are 2.21 (TC495) and 1.92 (TC494). The HT740 was designed for engines up to 425 hp and 1300 lb/ft of torque, but in transit buses those ratings are reduced to 350 hp and 1100 lb/ft. The HT747, with its special three-gear pump for better coolant flow, is used only in transit buses and is rated for engines producing up to 350 hp and 1100 lb/ft. The HT741 and HT748 are the respective electronic equivalents of the HT740 and HT747. Torque converter ratios are 3.04 (TC470), 2.21 (TC495), 2.09 (TC499) and 1.83 (TC496, not available for HT747). I also want to know whether or not any buses that originally came with the MT644 or MT647 were changed to the HT747 or HT748 transmissions for durability reasons shortly after initial delivery or during their mid-life overhaul? So far I know a few buses had swapped out their MT644 or MT647 transmissions for HT747s or HT748s: Timmins Transit (Timmins, ON) 1982 Orion I 01.504 52-54 (54 was later resold to Ajax Transit as 2044) Mississauga Transit (Mississauga, ON) 1983 Orion I 01.504 8401-8404 Mississauga Transit 1984 Orion I 01.506 8405-8416 (8416 was resold to the National Research Council shortly after initial delivery) Mississauga Transit 1985 Orion I 01.508 8501 (replaced 8416) Vaughan Transit (Vaughan, ON) (later York Region Transit) 1987 Orion I 01.502 517-518 (original 6V71N engines were also reportedly changed to 6V92TA MUI's) University Transit Service (Charlottesville, VA) 1983 Orion I 01.506 5139-5239 and 5337 ~Ben
  4. I am wondering if anyone has any application data regarding the Allison automatic transmissions used in our favorite buses of the 1970s, 1980s and early 1990s? Typically, these are the transmissions to be used in city buses: 100-175 hp = AT540, AT545 175-210 hp = MT640, MT(B)643 210-250 hp = MT(B)644, MT(B)647, MT(B)648 175-275 hp = MT(B)654CR, V730, V/VR731(RH) 275 hp or more = HT740, HT(B)741, HT746, HT747, HT(B)748 ~Ben
  5. Has anyone ever determined which torque converter ratio is best for each engine/transmission combo? Example 1: Allison AT545 transmission with TC290 (1.72:1) torque converter behind Cummins B5.9 190 hp (475 lb/ft) engine Example 2: Allison MT643 transmission with TC360 (2.86:1) torque converter behind Cummins B5.9 210 hp (485 lb/ft) engine Example 3: Allison MT644 transmission with TC494 (1.92:1) torque converter behind Detroit Diesel 6V92TA 253 hp (766 lb/ft) engine Axle torque ratings: calculated input torque to axle, determined by: T = maximum gross engine torque (lb/ft) N1 = lowest transmission forward gear ratio N2 = torque converter stall ratio (2.5 or specific value for automatics, or 1 for manuals) Say you have a Detroit Diesel 6V92TA MUI (mechanical unit injection) engine mated to an Allison MT644 automatic transmission, being used in an Orion I transit bus. Allison recommends the transmission not exceed more than 740 lb/ft of input torque from the engine for transit bus applications. Only two TC (torque converter) ratios were produced for the MT644: 1.92 (TC494) and 2.21 (TC495). As the 6V92TA 253 hp engine has 766 lb/ft of torque, the 1.92 TC ratio would be best suited to the transmission. Otherwise, the Allison HT747 transmission (for engines up to 345 hp/1100 lb/ft) is recommended. 766 x 3.58 x 1.92 = 5,265 lb/ft input torque to axle. If anyone knows what the recommended input torque to axle rating is for a Rockwell R143 series rear axle with 4.63 and 4.11 ratios, please try to answer. ~Ben
  6. Is it true that the 1982 and '83 Orion I's--the U.S. versions finished in New York--used the Allison HT747 transmission (rather than the original HT740) behind their DD 6V92TA engines? I'm talking about those buses as run by such agencies as: Pacific Transit System (Raymond, WA) Milford Transit District (Milford, CT) Montachusett Regional Transit Authority (Fitchburg, MA) Yakima Transit (Yakima, WA) SLO (San Luis Obispo) Transit (San Luis Obispo, CA) San Luis Obispo Regional Transit Authority (SLORTA) (San Luis Obispo, CA) GATRA (Taunton, MA) IndyGo (Indianapolis, IN) Waukesha Metro Transit (Waukesha, WI) The 1982 GATRA Orion I's are unique in that they were the only such 35-foot units finished in NY to carry the old model 01.504, since most of these got out with the model 01.506, which continued into part of 1984 (the year both the 01.504 and 01.506 were replaced by the 01.507). Did these three buses, numbered 8217 to 8219, use the Detroit Diesel 6V92TA engine and Allison HT747 transmission? ~Ben
  7. Benjamin

    Allison MT654CR

    Has anyone here heard of the Allison MT654CR 5-speed close-ratio automatic transmission? I know it seemed most popular outside North America; many articulated buses in those countries used it including the Volvo B58 and B10M. Input power: 300 hp max Input torque: 950 lb/ft max Input speed: 1900-3000 rpm Transmission gear ratios: 1st: 4.17:1 2nd: 2.21:1 3rd: 1.66:1 4th: 1.27:1 5th: 1.0:1 Reverse: 10.76:1 Torque converter ratios: TC430: 3.59:1 (crawl ratio: 14.97:1) TC495: 2.21:1 (crawl ratio: 9.22:1) TC496: 1.83:1 (crawl ratio: 7.63:1) TC497: 2.7:1 (crawl ratio: 11.26:1) Crawl ratio: first gear ratio x torque converter ratio ~Ben
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