Best way to boost octane from regular to high test
#11
The advertising is false with that crap, when they claim it raises your octane 7 points they mean .7 of 1 point and it takes alot of it to even do that when we are talking 100 gallons of gas. Adding race gas, clean tolulene or using Meth injection are the best ways to keep from knocking. A excellent suggestion was made too, start out with 100% race gas, fill up at 1/2 tank and you will still have alot of octane, alot of guys around here do that with there turbo snowmobiles, Smitty
#12
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I have been looking at the water/meth injector system from Snow. It's a pretty sophisticated system and gives you a ton of control and the pressure injection does a great job of atomizing the solution. I'm a premium only motor too and most of the poker runs are beyond my range so I sit them out. I'm wanting to take some longer trips so I have to do something if I want to get home in one piece. I just need to find out how long the juice lasts, I may not be any better off.
#13
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articfriends, i wonder how well the clean tolulene would do, gas products have some portion of tolulene, acetone and xylene added. adding more has seemed to start going backwards. i used to use acetone 30 yrs ago when premium and racing gas was not available, you probably refer to mixing with rv-offroad gas. water meth injection is controlled by nozzle/pressure, you could fab your own kit. most kits are setup for intake injection on turbodiesels and require higher pressure to atomize over intake air pressure, misting over carb/throttle body could get by with low pressure 20-30psi.
#14
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articfriends, i wonder how well the clean tolulene would do, gas products have some portion of tolulene, acetone and xylene added. adding more has seemed to start going backwards. i used to use acetone 30 yrs ago when premium and racing gas was not available, you probably refer to mixing with rv-offroad gas. water meth injection is controlled by nozzle/pressure, you could fab your own kit. most kits are setup for intake injection on turbodiesels and require higher pressure to atomize over intake air pressure, misting over carb/throttle body could get by with low pressure 20-30psi.
Drawbacks to Tolulene is if you add too much it is harder to get to fire and if you spill it on your paint or fibreglass its going to **** it up.
Supposedly it can be had in 55 gallon drums from paint supply houses for less than the cost of race gas but I haven't found it that cheap yet. If you were on the water and bought 50 gallons of 89 octane and you really needed 91 octane to keep your motor from detonating you would need to have 4 gallons of Tolulene (7.5%) with you to mix in , would be a REAL PIA plus it is a good example of why a 16 ounce bottle of ANYTHING can't really raise your octane a measurable amount, if Tolulene is 114 octane and it takes 4 gallons to raise your 89 to 91 the stuff in the bottle would have to be about 400 octane (which doesn't exist). If you started out with a 100 gallon mix (50 each) of 93 octane pump gas and 110 octane race gas you would have 101.5 octane , if you filled up with 89 octane when you were down to a 1/4 tank (75 gallons of 89 added to 25 gallons of whats left of your 101.5) you would have around 92 octane overall , Smitty
http://www.serioussolutions.com/evo/octcalc.htm
http://members.rennlist.com/951_race...etFuelFAQ.html
#15
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Hey Smitty, how much Methanol do you think it would take to raise 100 gallons 4-5 points? I know in a car you can get about 50 gallons of fuel to about 1 gallon of methanol injection, but these boats are going to run 2-3 PSi of boost for almost all of their fuel consumption so it seems like it would take a lot more, any idea? I had bounced around the idea of a "get home tank" for my buddy's MTI just in case we could only get 87-89 but have no idea how much the boat would have to carry.
Last edited by articfriends; 05-20-2012 at 06:41 PM.
#18
Great post Smitty, I worked in a shop years ago with a sprint car on methanol. In/out box, they would push it to get it started then roll it inside. It didn't seem to bother some people but I couldn't take it, I had to go outside I always heard that 50/50 100LL and unleaded 93 would raise the octane higher than the average because of all the lead. Have you heard this? 100LL has less lead than 100/130 (Green) but it still has a lot of lead in it. Doug
#19
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Thats a good question, I think some of the big shots from around Chicago with blown twin engine cats are running it so you might want to start a thread and see if they respond. A few years ago we had a good discussion on here about Methanol and there was a little info posted, not sure if capacity was mentioned, I will try to find the thread, Smitty
#20
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http://www.offshoreonly.com/forums/g...injection.html