Best way to boost octane from regular to high test
 

going on a poker run and can only get regular fuel but need high test , any suggestions .

meth injection

Marty starts out with all race gas, then when about half down, fills with the best gas he can get. That gives 150-175 miles of range and you're good. At cruise you should be getting almost 1 MPG.

good idea ted:eekdrop:

Think I will have to boost some gas , or else skip one of the stops . Thinking about going slow and stretching my fuel but , never seem to stay that way long enough to be effective .

i guess those auto parts store octane boosters are not worth it?

that s hit is useless,better to mix reg with racing gas as ted mentioned.

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

My boat stays on a lift and would be tough to get race fuel to it , I don't trust most boosters they seem to be over rated .

Call Turkey Point, I think they have some kind of deal rigged up for Marty. They put in a tank or something.

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.

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.

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.

The more expensive octane booster IS usually Tolulene (114 (RM/2 )octane) or Xylene (118 octane) and the older leaded race gas was comprised by more Tolulene than anything else. The race fuel used in F-1 racing years ago was 84% Tolulene and they would run more except the rules limited octane to 102 RON. The "100 octane LL" aviation gas planes run on IS 14 % tolulene. And there is already some in the premium we buy already.
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

For most disscussion they say Methanol is around 105-110 octane BUT the octane test is based around gasoline, Methanol ACTS more like 120 octane due to its cooling propertys (some race cars that run on it don't even have a cooling system). The best and really only way to use it on our boats is to use injection to get the most cooling efect along with detonation suppression. It may have a great octane number but if you had a auxillary furl tank with it or wanted to mix it into your gas tank you would have some serious issues to face- the most important one being the air fuel mixture on it is around 6-1 vs gasoline at 13-1 so IF you mixed it directly with your fuel your motor would lean out and self destruct. Sure, you could build a efi motor and use injectors twice as big as normal , have a fuel sensor like the flex fuel vehicles and some very good efi programming BUT if it hiccuped it would be game over for your motor. The next major problem is Methanol wouldn't neccesarily mix real well with your gas and you might be getting low octane gas or high octane methanol as fuel sloshed around. The other drawback that would make me avoid it (as far as mixing it) is that it is VERY corrosive , is hydroscopic (attracts moisture) and would definately not be good when using aluminum fuel tanks, I do have friends that run it in there drag cars and I also know a guy that runs his blown v drive on it but he has to flush his fuel system and change oil more often, it can be bought in bulk for about 2 dollars a gallon, used to be about 75 cents a gallon not to long ago, Smitty

Thanks, but I was talking about an injection system, like the Snow system or the old Edelbrock Varajection. It seems to me like it would take 10-15 gallons per 100 gallons of fuel since you are under load/boost all the time with a boat.

I have read good things about Torco Octane booster. You may want to check it out.

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

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

Here is a link from a while back, you might want to pm these guys to get more info, Smitty
http://www.offshoreonly.com/forums/g...injection.html

+1.

Used it in China this past weekend on a 12.5:1 race engine and the knock sensors didn't even touch the spark timing table.

But we were running 32oz of the stuff per 5 gallons of gas.

Won the race and the engine is healthy. But it didnt see the constant load it would of in a boat.

Still might be worth a look. No doubt we picked up more than just a couple points of "octane" or the knock sensors would have pulled timing.

It does make the plugs turn a funny color, but not from detonation.

Look into Aces. A lot of the 2-stroke run it and I've heard great things. It also helps with the ethanol fuel crap too. It's not cheap, but it goes a long way.

Thanks man!

Hmm, I wonder if the fact that Ice Injection is no longer in business is a clue?......

We are still in business but unfortunately we are having problems with our web site not our product.I don't know of any companies that make a kit for a marine application other than us.Our solenoid alone costs "us "more than an entire Snow kit.
It is definitely easier to add race fuel to your big blown power than it is to initially set up your injection system..With meth injection you must carefully monitor all of your temperatures especially your EGTs.
You can however achieve the same performance results running less timing and with $4.00 a gallon regular fuel.On our test boat running 15lbs of boost we would burn 15 to 20 gallons of meth per 175 or so of fuel.Still cheaper than straight race fuel as meth comes in as needed for us around 8 +lbs or so.

I talked to the guys at Snow and they said a 700hp motor could make 7 1/4 mile passes on a 3qt reservoir. I figured I'd need a 15 gallon tank to get the range I needed. The racing gas idea is sounding better.

Pm me a price for a "kit" if you are marketing one, I would figure I would need a 7.5 gallon tank as I have a 90 gallon fuel tank and have neve used a whole tank of gas in one day ever, thanks, Smitty

as far as the EGTS, did you see higher temps from running pump gas vs race gas (which I would expect) or did running the Methanol lean the motor out and drive egts up? I run 12-13 psi of boost on pump 93, when I run 14 psi I usually mix in 10-20% race gas, Smitty