Bus Crazy
Join Date: Jun 2016
Location: Orange County, CA
Posts: 1,362
Year: 1990
Coachwork: Crown, integral. (With 2kW of tiltable solar)
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
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If the Phantoms had the 253HP version of the 6V92 they would have used the smaller MT transmission, but if they had the 277HP 6V92 they needed the big HT740 transmission because that engine exceeded the MT's input torque rating. The lower HP 6V92s are fine for level ground but will climb long grades slightly slower than the higher HP 6V92s, but they also have less tendency to overheat because they're burning less fuel. The big 6V92s however have the better transmission: the HT locks in 2nd, 3rd and 4th, while the MT locks only in 3rd and 4th. If you have a bus specced for mountain use with a Jake brake, it won't be much good in 2nd gear if you have a MT.
If you really have to swap engines from a 6V92, a Series 50 is the only practical option, but then the usual 4.10 axle will be too low geared for the Series 50. Just keep with the 6V92 - it's a fine engine if you know how to drive it correctly.
One thing about the high windows and the flattish roof - it prevents using overhead cabinets inside, unless they are very small.
John
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