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Just switched fuels (Dayco to Trick ) and noticed the blown jet was/seemed a bit "fat" on the exaust and the plug readings checked my fuel bowls and all four levels were up a bit from last use ? :))eek:))
 

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Interesting observation. Something you may not always think about. I remember back many years ago when we actually mixed or blended fuel at the drag strip, we measured specific gravity to confirm the percetage of nitro methane in the mix. Makes sense if there was signficant difference in the specific gravities. Have you compared the specific graviites of the fuels?
 

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Interesting observation. Something you may not always think about. I remember back many years ago when we actually mixed or blended fuel at the drag strip, we measured specific gravity to confirm the percetage of nitro methane in the mix. Makes sense if there was signficant difference in the specific gravities. Have you compared the specific graviites of the fuels?
Still researching mostly just curious but I found this ...
Sunoco Race Fuels | Specific Gravity - What Is It And Why Does It Matter?

"First, specific gravity has an impact on fuel metering, especially for carbureted engines. A heavier fuel is of course denser, so the float in a carb’s float bowl will sit higher than if a lighter fuel was used. If the float sits higher, the fuel level will be lower. Fuel level affects fuel metering in a number of ways, so if you’re switching fuels, pay attention to the fuel level in the bowls."
 

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Switching fuels is tricky business. It not only effects the float level and all that comes along with that, but it effects jetting as well.
We switch between two fuels depending on the type of course and its location. But we have learned what to expect between the two. If the SG is minor it doesn't amount to a whole lot. But it is big, the changes are big. One other thing to keep in mind, the SG of seasonal pump gas changes thru the year. Most boating is done during the summer months so it doesn't impact boating as much as other motosports.

Some may think its crazy to switch fuels for differing courses. Its not as crazy as you might think. It does mack a difference.
LINK: Shell fuel calculator



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