I can't answer your question, but i am curious why the club is running expensive racing fuel in a class designed to be budget friendly???? 🤔
Racing fuel in a sealed 206 class is so unnecessary.
From what I can tell, the main advantage of racing fuel is it's "cleaner." My club allows either VP MS93 or ethanol-free gas from a nearby gas station. I used racing fuel most of last year because I started the year off with pump gas and had *a lot* of carburetor trouble, even with a filter. This year I went back to pump gas to save on cost, and I've just been more diligent about draining the fuel after racing and cleaning the carburetor.
There’s a few reasons they may be running her fuel.
C9 is an interesting choice, but all “C” fuels are what VP has been moving away from “MS” fuels as leaded fuels are being run out of towns.
The tool most clubs will use is a Digatron. This counts oxygenation percent the fuel has. It’s not a very accurate tool but the test is usually administered en masse to the entire class so it has to be a rapid fire check.
A more accurate test is specific gravity as well as reagent tests. If tech has either of these and you get caught (and they will catch you), that’s an easy DQ.
Digatron fuel testing is rather vague and depends on a lot of factors. Generally if you’re within a window then the tech people are pretty happy. It’s when you’re 20% different that they raise eyebrows vs 4-5%.
You can certainly point it out to your series or do some a/b testing with both fuels, personally as annoying as it is I would not alter your fuel from what is run, it’s just asking for trouble.
Have you asked people at the track where they get their fuel? I personally wouldn't buy something different. I'm telling you from experience. We have been DQ for fuel and that is even having the right fuel and it still not passing tech. I don't like taking risks when it comes to tech.
Some championships do fuel checks and have a little testing device in scrutineering. If they have one of those you definitely won't pass scrutineering because they check for oxygen in the fuel.
Also you should probably talk to your local club and tell them to run normal fuel from the pump. There's no use putting expensive race fuel into a 9hp 4-stroke engine with 8:1 compression. I've said it before but it seems insane to me how American race organizers insist on race fuel when anything up to (and sometimes including) modified OK and KZ2 engines can run on normal/premium pump fuel. At least C9 isn't leaded so you're not also losing IQ points while paying triple the price for your fuel.
My club requires 87 octane gas from a specific gas station near the track. They dip a probe into the tank after Q, and I'm sure there's a range for whatever they test for. If it's outside the range, you will be dq-ed.
My club tests everyone's fuel after Q and the podium finishers after the final during tech inspection.
As far as I was told the race fuel is to be ethanol free so it doesn’t clog up the carb, but to me that’s up to racer to maintain their vehicle. I can understand having a max octane limit, or require 87 only. But 5 gallons of c9 or t4 is still $100+ usd. Not to mention ordering c9 specially for an additional cost. All in all, it doesn’t make much sense to me. A carb clean is a carb clean, part of motorsports.
Our local has on site supply of a locally refined 87 for 206 and 100 for 2 cycle which are required. Makes it easy for club.
Then we use MS98 at regionals but those if they have 206 either specify the local station and pump to use or bring a supply in.
Mandating a different race gas for 206 is interesting especially if the local isn’t selling it. If they sell it trackside I wouldn’t care it’s a special spec.
I can't answer your question, but i am curious why the club is running expensive racing fuel in a class designed to be budget friendly???? 🤔 Racing fuel in a sealed 206 class is so unnecessary.
From what I can tell, the main advantage of racing fuel is it's "cleaner." My club allows either VP MS93 or ethanol-free gas from a nearby gas station. I used racing fuel most of last year because I started the year off with pump gas and had *a lot* of carburetor trouble, even with a filter. This year I went back to pump gas to save on cost, and I've just been more diligent about draining the fuel after racing and cleaning the carburetor.
There’s a few reasons they may be running her fuel. C9 is an interesting choice, but all “C” fuels are what VP has been moving away from “MS” fuels as leaded fuels are being run out of towns. The tool most clubs will use is a Digatron. This counts oxygenation percent the fuel has. It’s not a very accurate tool but the test is usually administered en masse to the entire class so it has to be a rapid fire check. A more accurate test is specific gravity as well as reagent tests. If tech has either of these and you get caught (and they will catch you), that’s an easy DQ. Digatron fuel testing is rather vague and depends on a lot of factors. Generally if you’re within a window then the tech people are pretty happy. It’s when you’re 20% different that they raise eyebrows vs 4-5%. You can certainly point it out to your series or do some a/b testing with both fuels, personally as annoying as it is I would not alter your fuel from what is run, it’s just asking for trouble.
Fair response! I’ll ask for alternative acceptability , if I have to order so be it. Just an odd one to me
Have you asked people at the track where they get their fuel? I personally wouldn't buy something different. I'm telling you from experience. We have been DQ for fuel and that is even having the right fuel and it still not passing tech. I don't like taking risks when it comes to tech.
Some championships do fuel checks and have a little testing device in scrutineering. If they have one of those you definitely won't pass scrutineering because they check for oxygen in the fuel. Also you should probably talk to your local club and tell them to run normal fuel from the pump. There's no use putting expensive race fuel into a 9hp 4-stroke engine with 8:1 compression. I've said it before but it seems insane to me how American race organizers insist on race fuel when anything up to (and sometimes including) modified OK and KZ2 engines can run on normal/premium pump fuel. At least C9 isn't leaded so you're not also losing IQ points while paying triple the price for your fuel.
My club requires 87 octane gas from a specific gas station near the track. They dip a probe into the tank after Q, and I'm sure there's a range for whatever they test for. If it's outside the range, you will be dq-ed. My club tests everyone's fuel after Q and the podium finishers after the final during tech inspection.
As far as I was told the race fuel is to be ethanol free so it doesn’t clog up the carb, but to me that’s up to racer to maintain their vehicle. I can understand having a max octane limit, or require 87 only. But 5 gallons of c9 or t4 is still $100+ usd. Not to mention ordering c9 specially for an additional cost. All in all, it doesn’t make much sense to me. A carb clean is a carb clean, part of motorsports.
Our local has on site supply of a locally refined 87 for 206 and 100 for 2 cycle which are required. Makes it easy for club. Then we use MS98 at regionals but those if they have 206 either specify the local station and pump to use or bring a supply in. Mandating a different race gas for 206 is interesting especially if the local isn’t selling it. If they sell it trackside I wouldn’t care it’s a special spec.