Running Petrol / Ethanol mix
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2nd Gear
Joined: Jan 2017
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From: Cayman Islands
Running Petrol / Ethanol mix
I am rebuilding my 1984 S&S 124" 10.8:1 engine and I am considering running a mixture of 'racing' ethanol with a MON higher than 108 & RON higher than 128 and today's racing ethanol is in no way corrosive to the bike's fuel system.
My thinking is that even with just a 20% mixture I gain the capacity to run a higher compression ratio which would be apparent on and off the can - the cam I will run is the S&S 640 cam.
Obviously, range is a real issue but it is one I think I can tackle sufficiently such that I don't waste $1,000s on an engine rebuild given the nature of my riding.
Any advice, experience with such endeavors, comments etc would be greatly appreciated
My thinking is that even with just a 20% mixture I gain the capacity to run a higher compression ratio which would be apparent on and off the can - the cam I will run is the S&S 640 cam.
Obviously, range is a real issue but it is one I think I can tackle sufficiently such that I don't waste $1,000s on an engine rebuild given the nature of my riding.
Any advice, experience with such endeavors, comments etc would be greatly appreciated
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2nd Gear
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From: Cayman Islands
I don't live in the Caymans despite my email address. I live in Sydney, Australia and face fuel is readily available. The E98 I referred to above is Ethanol not Methanol, MON of at least 106 and RON of 128.
It's widely used in club leveling racing and modified street cars.
It's widely used in club leveling racing and modified street cars.
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Joined: Jul 2014
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From: Windwardside, Saba N.A.
I don't live in the Caymans despite my email address. I live in Sydney, Australia and face fuel is readily available. The E98 I referred to above is Ethanol not Methanol, MON of at least 106 and RON of 128.
It's widely used in club leveling racing and modified street cars.
It's widely used in club leveling racing and modified street cars.
I run sort'a the reverse of what you describe.
Where I live 93 octane ethanol is the best commonly-available pump gas.
The 120R in my motor is dyno-tuned for 93 but winter-blend gasoline here is borderline as far as pre-detonation with a tuned engine. So I recently started running a blend of 93 ethanol and 100 non-ethanol race fuel and it seems to work well. Blend is 2 gallons 100 non-ethanol and top-off with 93 ethanol.
I drive 40 miles to get race fuel from a gasoline station pump.
I once owned a 1984 Shovel that ran 103 octane from VP Racing Fuels but that was years ago.
You might consider adding toluene to your regular fuel. Toluene is 121 RON, 107 MON and 114 octane R+M/2.
Some folks use xylene but I haven't done that yet. Xylene is 118/115.
ETA Here's an octane calculator that will get you the desired final octane rating
http://www.motorsportsracingfuels.co...alculator.html
ETA2 How To Make Your Own Race Fuel
http://www.rx7club.com/rotary-car-pe...e-fuel-669583/
Last edited by Sierra977; Feb 6, 2017 at 01:26 PM.
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2nd Gear
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From: Cayman Islands
It seems you know your fuels and and solvents. To be honest, I've always run an ethanol mix even if its just 15% for the cooling and anti knock I feel I've enjoyed on forced induction engines.
Whilst this isn't forced induction all the lovely research the English did during WW2 afterwards on Methanol injection on the Merlin engines makes for fascinating reading on the benefits.
Whilst this isn't forced induction all the lovely research the English did during WW2 afterwards on Methanol injection on the Merlin engines makes for fascinating reading on the benefits.
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