[Fwd: [M] [M} IC Thermodynamics]- Part 3

[Greg Hermann]

>
> Propane is not an explosive, and feeding it ahead of the turbo won't
>hurt a thing.  Lots of Diesels do just that as a power booster, and
>then there are all those cars (and a few motorcycles, like the semi-
>factory ATP Kawasakis) with carburetors upstream of the turbo.  Now
>under certain circumstances you could generate a truly impressive
>backfire, but that's not the same as an explosion.
>
No it is not. but (Thermo 101 and Fluids !01) gaseous fuel, whether
evaporated gasoline or propane, in the intake tract before the intake valve
closes, displaces air (oxygen, the stuff you use to burn the fuel to make
the power). The lighter the molecular weight of a given gaseous fuel, the
higher the percentage of air it displaces, and the more it reduces the
power available (at any given final manifold density). Squirting "Happy
Juice" in as a coolant  is a different story---because a higher percentage
of nitrous' molecular weight is in oxygen than is true for air. Therefore,
although it displaces air too, it replaces it with MORE oxygen, therefore
you can burn more fuel, therefore you go faster.

Regards, Greg