2 fuel questions?

[SuzookKING]

2 fuel questions for Rich

If one were to switch from pump gas to racegas, is it going to make it run rich or lean from the swap without changing anything else?

and/or

if you switch to a heavier fuel (from 0.69 Specific Gravity to a 0.74 SG) would it richen or lean the mixture?
*neither being an oxygenated fuel*

 

[Rich Rohrich]

Originally posted by SuzookKING
If one were to switch from pump gas to racegas, is it going to make it run rich or lean from the swap without changing anything else?

If you are switching from pump fuel to a non-oxygenated race gas it will generally run richer as a result of the new fuel.

Originally posted by SuzookKING
if you switch to a heavier fuel (from 0.69 Specific Gravity to a 0.74 SG) would it richen or lean the mixture?
*neither being an oxygenated fuel*

It depends on what is in the fuel. You could easily start with a sub .700 SG fuel like VP C18 and change to a .750 SG pump fuel and have it go lean as a result. The makeup of the fuel, how well it vaporizes, and the basic layout of the engine will play a large role in a given fuel's effect on jetting.

 

[SuzookKING]

Thnx :D