Fuel for Test Days on a Budget?


(Ryan Row) #1

For people who are on a budget, what fuels are being used for 100cc air cooled engines? I’m currently running a rental kart series at my local track and I plan on running my own kart in 2020. Just trying to budget recurring costs and I can’t find any info about what fuel people use for non race days. At $15/gallon for c12, honing my driving skills can get pretty expensive


(Jim Maier) #2

Get avgas at the airport. We use it in our TAGS here for the local stuff. Maybe $5 or $6 gallon. 100 Octane.


(James McMahon) #3

What kind of 100cc engine are you talking about? I’ll chime in with some general info for now…

Most people use left over but not entirely spent race fuel, you’ll usually have some left over after a weekend. You could maybe even buy leftover fuel from racers that don’t want to have to bring it home.

Less expensive options (feasibility varies):

A less expensive racing fuel from a pump that’s intended for recreational vehicles.
100LL piston aircraft fuel.
Blend of pump gas (Non oxy\non ethanol) with racing fuel.
Pump gas (Again non-oxy, ethanol free).

As you go down this list, more caution should be exercised in terms of monitoring how your engine responds to tuning.

The octane needs of these engines tends to be low, so that makes the octane of pump gas suitable. Indeed there are low octane race fuels. However, other key differences between pump gas and “race fuel” that you should keep in mind.

Consistency between batches: Naturally quality is more tightly controlled in race fuel.
Storage: Again consistency and freshness is key for racing fuels. Not so much needed for road vehicles.
Lead content: Most racing fuels used in karting (for better or worse) are leaded. The lead leaves a nice coating on the internals of a two stroke engine adding some lubricity. This is where a blend of race and pump gas can be a good option.


(James McMahon) #4

Have you found any specific tuning differences or behaviors between 100LL and something like MS98, C12, VP111 etc?


(Bryan Williams ) #5

I’m about 10 min away from Buttonwillow Race track and they have 110 at the pump. I’ll run it with Burris hirev castor sometimes. It’s not a huge savings at 9$ a gallon and oil is just a bit cheaper. I’ve heard the c12 is a bit faster.


(Ryan Row) #6

Thank you for all the input guys. Any savings, especially in consumables adds up. To answer your question @KartingIsLife I plan on running the kpv or one of the tag 100cc depending on budget and popularity


(Jim Maier) #7

I have not noticed. Don’t really mess with carb or jetting when running locally though. Just banging out laps to keep my driver in shape.


(Chris Burke) #8

You’ll be okay with premium pump gas. Badger Kart Club has a pretty decent 2-cycle crowd, and we’ve used 93-octane pump gas sourced from a local gas station as the spec fuel for everything from Kid Karts to TaGs since forever.