Sat Apr 28, 2018 4:27 pm by cornbinder89
All I was saying was: IHC used different c/r pistons on factory LP engines than they did on gasoline built engines, it make a big difference on how much the engine is "derated" on LP. I agree it will be less powerful than a the same engine optimized for gasoline, but not nearly as much as a gasoline engine that is run on LP.
The timing is different on LP, the spark plug gap is different on LP, there are a lot of small things that all contribute to making a LP only engine much more powerful than a duel fuel.
A 190 could have anything up to a 501, with the 450 being more likely. For its day, it would be a fairly powerful truck.
A RD450 on gasoline was 175 hp, on propane was 153, neither are going to "light up the tires" torque is 396@1400 for gas and 364 @ 800 for LP. LP producing the torque much lower in the band.
Plug gap is .016 for LP vs. .030 for Gasoline
Static timing is 5 deg BTDC for gas and 10 BTDC for LP.
The RD has a larger open combustion chamber in the head, limiting how much pistons alone can change the Compression ratio. If IHC had made a LP head for it those numbers would be even higher.