Thread: Who knows about coaches?

Originally Posted by V8Ian

GMs don't leak if they're put together with a bit of silastic and gallons of Dulux. Seriously, Barry (Bear) and Kelvin from Detroit and later proprietors of North Pine Truck Repairs, could put the two strokes together and guarantee them oil tight.
Brian, what sort of consumption could I reasonably expect from a 6V92 grossing no more than 25 tonne at 1500-1550 rpm? Will the Detroit be happy at those low revs?

Ian, I would only be guessing at fuel consumption. The 8V92TA's did about 5 miles per gallon (I always converted back to make sense. L/100k's is meaningless to me).

The 6V92TA can be set to 335 hp @ 2100 or 322 hp @ 1950. Peak torque in either case is 957 lb/ft @ 1300 and is much the same at 1500.

Then there is the 6V92TTA "Fuel Squeezer" as DDA termed it. 270 hp @ 1950 or 307 hp @ 1900. Again peak torque of 957 lb/ft @ 1300 and almost the same @ 1500.

In all ratings best fuel consumption is at 1500 rpm.

Operating range is from governed rpm to 1300 rpm. The Spicer 1107 suited this perfectly. A 9509 would be good also.

Originally Posted by Sitec

I believe this one is powered by a V8 Troit, and goes like a rocket!! It belongs to an American Entertainer called J Leno... There's also a red one used in the film RV and some of the interior shots are good but yes, you are right... Prob restricted space! Still want one tho!

Probably 6V53, check out this clip; it even has a tune for Digger.

[ame=http://www.youtube.com/watch?v=gw9BYu6BqJo]Flxible Clipper 1951 - YouTube[/ame]

And this link. I think most Flxibles were originally Duetz (air cooled) power but no doubt Glen, Brian or Kev will confirm or deny.

Clippers in Australia | Flxible Clipper Club of Australia

Originally Posted by Brian Hjelm

Ian, I would only be guessing at fuel consumption. The 8V92TA's did about 5 miles per gallon (I always converted back to make sense. L/100k's is meaningless to me).

The 6V92TA can be set to 335 hp @ 2100 or 322 hp @ 1950. Peak torque in either case is 957 lb/ft @ 1300 and is much the same at 1500.

Then there is the 6V92TTA "Fuel Squeezer" as DDA termed it. 270 hp @ 1950 or 307 hp @ 1900. Again peak torque of 957 lb/ft @ 1300 and almost the same @ 1500.

In all ratings best fuel consumption is at 1500 rpm.

Operating range is from governed rpm to 1300 rpm. The Spicer 1107 suited this perfectly. A 9509 would be good also.

My RC 64 used to return 4.5 mpg regardless of weight, terrain or driving style, the big C @ 350HP (don't laugh, twas well respected HP in its day) through a thirteen over to 5.28s was consistent if not economical. A fiddle to extract an extra 80 HP and ratio change to 3.7 changed the whole ball game. Driving style became critical for economy. The revised spec produced an average of 7-7.5 with one Bris-Mt Isa return at 9.9; I was never able to repeat that figure and still wonder if I misplaced a fuel receipt.
Based on these figures I was hoping to achieve 10+mpg from a 6V92 at at least half of the weights I used to gross.

Originally Posted by V8Ian

My RC 64 used to return 4.5 mpg regardless of weight, terrain or driving style, the big C @ 350HP (don't laugh, twas well respected HP in its day) through a thirteen over to 5.28s was consistent if not economical. A fiddle to extract an extra 80 HP and ratio change to 3.7 changed the whole ball game. Driving style became critical for economy. The revised spec produced an average of 7-7.5 with one Bris-Mt Isa return at 9.9; I was never able to repeat that figure and still wonder if I misplaced a fuel receipt.
Based on these figures I was hoping to achieve 10+mpg from a 6V92 at at least half of the weights I used to gross.

Ian, what does a bus weigh? What axle ratios do they use? O/d or direct?

1500 rpm and 3.7 overall gear ratio is near spot on 80 kph and 1900 rpm gives 100 kph. Then if you turned the wick up to 2100 you would hit 108kph.

I was thinking 3.7 or taller with 0.73 OD, that should give 100 kph at 15-1550 rpm on 11R/295s

Ian, HERE is a page about a GM 4905 conversion

Cheers

Originally Posted by V8Ian

Probably 6V53, check out this clip; it even has a tune for Digger.

Flxible Clipper 1951 - YouTube

And this link. I think most Flxibles were originally Duetz (air cooled) power but no doubt Glen, Brian or Kev will confirm or deny.

Clippers in Australia | Flxible Clipper Club of Australia

AC/DC used to have a Clipper as their tour bus. I worked for QBM in the 70's, we repowered it with a V8 Perkins, went well.

I never had much to do with them. Ones I can recall had either Deutz or Detroit 4-71N. I did see one with the twin Detroit 4-71N which GM used to call a "pallet". They also did "pallets" in 2 x 6-71 and 4 x 6-71 and maybe more but I never saw them. Used in marine and stationary applications mostly, pumps, drilling rigs, etc.