Topic: Racing Fuel In Austrailia

[Rocketman]

Have an opportunity to participate in the International Island Classic in January.  Will be taking my 2 stroke Suzuki (I know, heresy!)  Was advised by a former participant the best race fuel available is 100 low lead aviation gas.  I normally run 110 octane leaded Sunoco in all my race bikes.  Can any of our Aussie members confirm what fuels are available down under?  Thanks.

[sohc boy]

Hi Rocketman , you looked up Power Plus racing fuel

[Rocketman]

Thanks SOHC Boy.  Power Plus looks like an option.  Would like to hear from anyone who is currently using it in a production roadracer such as a TZ or RG.  Which fuel are they using and were any adjustments to the ignition timing necessary?

[MRieck]

I just have to ask.....why do you need 110 octane....for roadracing???

[Rocketman]

At most of the tracks I race in the mid-west you have two fuel options.  Sunoco Standard (leaded 110 octane) and an unleaded gas, SS100 I think.  I'm old school and wanted to use a leaded gas in my 4 stroke racer.  Could probably use the unleaded fuel in my two stroke race bike though.  Here is what Sunoco says about these fuels:

Sunoco® Standard™ is a 110 octane leaded race fuel that is used in many forms of motorsports.  Sunoco Standard is designed for compression ratios up to about 13:1 in conventional V8 engines with iron cylinder heads.  It can tolerate higher compression ratios in aluminum cylinder head applications or engines with smaller or more efficient combustion chambers.  While most racers use Sunoco Standard in naturally aspirated applications, it is also a good choice for mild nitrous, turbocharged, and supercharged applications.

Sunoco SS 100 is an unleaded high octane gasoline that is street-legal in California. Its 100 octane rating will allow increased boost levels in supercharged or turbocharged applications compared to premium pump gas. Sunoco SS 100 can be used in high performance vehicles both old and new. It can also be used in applications such as motorcycles, ATVs, karts, and other smaller engine vehicles.

When I started racing in the 70's Sunoco Cam 2 was the fuel of choice, but is no longer available.  Here is a link to the Sunoco web site:

http://www.sunocoracefuels.com/fuels

[Haybus]

There's plenty of information online about this very subject. Of course most of it is opinion based. Sunoco 110 has a Motor Octane Number of 106 and a Research Octane Number of 114, with the typical US road based fuel calculation (R+M)/2 being 110. Avgas 110LL is rated using a different method, but similar to MON, and is only stated by that lower number. 106 vs 100, perhaps good enough if you're only after knock protection on your high CR motor. I'm running 100LL in my rated 12.5:1 motor, but was previously running Sunoco 110.

Alan