Octane additives?

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Since I've had this motor it's ran on nothing but 100ll. It's got 596 heads with 202 valves and from everything I read there about 68 to 72 ccs? And I know I'm about five hundred thousand out of the hole with the flat top icon Pistons.

JPar, remeasure.........five hundred thousands ( .500 ) is a 1/2 inch!!!!!
 
Again convenience to get the product and cost per gallon? And of course performance is always nice.
The 92 non-ethanol is 4.69 a gallon and the backstabbers 108 equals out to about $13.40 a gallon. Which equals out to about $6.43 per gallon at a 4 to 1 mixture. And that's about what the hundred LL goes for. The difference in convenience between the two feels is Worlds Apart. The backstabbers is 15 blocks one way and non-ethanol is 25 blocks the other way 100ll is gas cans only all the way out to the airport.


The brown truck comes by my house every day. I don't even have to leave the house to order or pick up the product.

Don't think in terms of octane boost. There is more to it than that. For a fuel to be sold publically at the pump (even clear fuel) it has to have detergents, stabilizers and other crap in it that race fuels don't. There are also 3-4 (maybe 1-2 more depending on region) blends that are seasonal. Winter blend always gets the least fuel mileage because they have to lower the Reid Vapour Pressure so they will start cold and run in cold weather. That same fuel in the summer will boil in the bowls and even in the injectors.

You need to condition the fuel to make all the additives consumable. Most octane boosters don't do that.

As far as cost if you use a fuel conditioner you don't have to buy clear fuel. Right now (over hear) 92 pump gas is about 3.15 a gallon. I can't remember off the top of my head exact costs, but it seems to me I'm around 6 bucks a gallon at the most using Torco. I carry a ratio rite (I know you have one because is suspect your snowmobiles are two strokes) and two cans of Torco in the trunk. When I add pump fuel I grab the ratio rite and add the appropriate number of ounces of Torco and dump it in the tank and off I go.

The hard part is I don't always use it so I have to guesstimate how many ounces I need on the first tank after not using it for awhile.
 
The brown truck comes by my house every day. I don't even have to leave the house to order or pick up the product.

Don't think in terms of octane boost. There is more to it than that. For a fuel to be sold publically at the pump (even clear fuel) it has to have detergents, stabilizers and other crap in it that race fuels don't. There are also 3-4 (maybe 1-2 more depending on region) blends that are seasonal. Winter blend always gets the least fuel mileage because they have to lower the Reid Vapour Pressure so they will start cold and run in cold weather. That same fuel in the summer will boil in the bowls and even in the injectors.

You need to condition the fuel to make all the additives consumable. Most octane boosters don't do that.

As far as cost if you use a fuel conditioner you don't have to buy clear fuel. Right now (over hear) 92 pump gas is about 3.15 a gallon. I can't remember off the top of my head exact costs, but it seems to me I'm around 6 bucks a gallon at the most using Torco. I carry a ratio rite (I know you have one because is suspect your snowmobiles are two strokes) and two cans of Torco in the trunk. When I add pump fuel I grab the ratio rite and add the appropriate number of ounces of Torco and dump it in the tank and off I go.

The hard part is I don't always use it so I have to guesstimate how many ounces I need on the first tank after not using it for awhile.
Always bringing up my snowmobiles!? (I know you love snow) there oil injected. My ratio rite is for the YZ250.
 
I think I'll start with buying a 5-gallon can of the 108 at backstabbers and mixed 1 gallon per 4 gallons of 92 non ethanol? Then I can carry a couple little one gallon cans of 108 for mixing with four gallons on the road?
^^^^^^^
this ratio only comes out to 95.1 where I went to school. I `m not sure I`d run it in 2 stroke motors, but B 12 chemtool carb. and f. inj. cleaner has 5/6 octane boosters in it, matter of fact , everything in it is. Buy a can and read the label. I have been using it ever since Torco went out of site on the price, (years!). The B 12 , when mixed , smells like the gas we can buy at the dragstrip. Trial and error on how much to mix. I have run a full can to a full 18 gal. tank and had had good results. Check it it out !
 
Dumping the booster into the tank is a bad idea, since most of it goes right to the bottom. Always mix it with some gas first. I have had real good luck with Lucas 10026 "racing" octane booster, used per their instructions. Now, I only have a 10.5:1 340, but on 93 octane gasohol (the best we have here), it sometimes pings. With the Lucas stuff added, it does not.
 
I used to know a guy who was a chemist for a refinery. He had a strongly built 65 Corvette and he would buy Toluene and Xylene from the paint store to mix with his gasoline to raise the octane so he didn't have to use race gas when he drove on the street. He claimed that those were the eight carbon compounds used to raise octane at the refinery. I would guess someone strong in chemistry could determine a mix ratio. The next question would be whether that would be economical these days or not.
 
I got a hold of the race gas place down by Delta Park. I think they were saying $8.99 for 110? I'm going to go down and see what that's all about.
 
I would either, buy race gas (50/50 mix with pump gas at a minimum)....or switch to e85. I don't recommend playing chemist, mixing random hydrocarbons, unless you are indeed a chemist.

e85 would solve your problem and save you money fairly quickly if it is available in your area.
 
I got a hold of the race gas place down by Delta Park. I think they were saying $8.99 for 110? I'm going to go down and see what that's all about.
Sounds like it'll cost ya 10 bucks to go through 3 gears.... Time for a slant six :poke:
 
I would either, buy race gas (50/50 mix with pump gas at a minimum)....or switch to e85. I don't recommend playing chemist, mixing random hydrocarbons, unless you are indeed a chemist.

e85 would solve your problem and save you money fairly quickly if it is available in your area.
The E85 is down at the same place where I have to go get the race gas LOL doing the mix is a ploy to keep me from going down there absolutely every time I need gas. Just every third or fourth time would be plenty.
 
I buy Sunuco 110 out of the pump for just over 6/gal. Just keep some on hand for Mopars and dirt bikes.
 
Wasnt that octane in a bottle originally for no hardened valve seats? kind of like a lead additive?
There are so many different brands of the stuff. The additive that "MotorMedic", "Gunk", and others sell as "Lead Substitute" supposedly contains ingredients to protect the valve seats, but I have never seen a definitive test that says the stuff actually works. It is not an octane booster. Anyways, how many of us still have non-hardened valve seats in our engines?
 
Has anyone tried this Race Gas additive? I just bought a bottle to try out on my wanting to ping 340.
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P.S. good thread here thanks
 
<------ My 2 cents. I have O2 sensors in each collector. They do not play well with leaded fuel. I run 93 octane Sunoco with the Race Gas (unleaded freindly) additive. 5 ounces race gas per gallon , gives me 103 octane, have also run it 105 octane but made no difference. Runs fine, 37 degrees advance. I have 11.4 comp, big roller cam, alum. heads. It works very well but it does discolor the plugs, but that's what the O2 sensors are for. The can size I get is 32 oz. so I can treat 6 gallons. The can costs $29.97 at Summit. Is 100ll lead free?
 
P.S. I met the president of Race Gas last November when filming my segment for Performance TV. He told me they were working on a new formula that was better than the original. Don't know if it is out yet.
 
U said airport, u been buying 100 airplane fuel that is designed for hi altitude, or does your airport sell auto race gas? Vehicle weight and rear gear makes a big impact on what octane is needed. My 360 with 67 cc iron heads and quench and 1008 gaskets and 260* at .050 intake and exhaust and 110 lobe sep in at 107 and 4.56 gears and a833 runs fine on pump 92 with 37 total advance. 3210 lbs. With driver, 28" tire . A measured 11.4:1
 
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Okay so what I did was pour the 6 gallon of 92 non ethanol in and 2 gallons of leaded 110 Sunoco race fuel. I just started it up and backed off a couple degrees on the timing down to 34. From 36. Hopefully I'll get it aligned tomorrow morning and get a chance to drive it and see how it acts.
 
<------ My 2 cents. I have O2 sensors in each collector. They do not play well with leaded fuel. I run 93 octane Sunoco with the Race Gas (unleaded freindly) additive. 5 ounces race gas per gallon , gives me 103 octane, have also run it 105 octane but made no difference. Runs fine, 37 degrees advance. I have 11.4 comp, big roller cam, alum. heads. It works very well but it does discolor the plugs, but that's what the O2 sensors are for. The can size I get is 32 oz. so I can treat 6 gallons. The can costs $29.97 at Summit. Is 100ll lead free?
If I'm not mistaken I believe you're aluminum heads are going to help quite a bit in this situation?
 
<------ My 2 cents. I have O2 sensors in each collector. They do not play well with leaded fuel. I run 93 octane Sunoco with the Race Gas (unleaded freindly) additive. 5 ounces race gas per gallon , gives me 103 octane, have also run it 105 octane but made no difference. Runs fine, 37 degrees advance. I have 11.4 comp, big roller cam, alum. heads. It works very well but it does discolor the plugs, but that's what the O2 sensors are for. The can size I get is 32 oz. so I can treat 6 gallons. The can costs $29.97 at Summit. Is 100ll lead free?
The LL stands for "low lead", so yes it has lead.
 
Back in 1995 I would add a a few gallons of vp c12 to 92 pump gas. Found it is not needed, as I keep the revs up with the manual box in the right gear. Carb, old 1969 440 magnum 750 avs is not jetted for best gas mileage. At the track I throw in some race gas to run 11.6 in street trim with 10.5 slicks
 
My understanding is that AV gas has a slower burn rate meant for lower rpm motors.
I was also told by an avation mechanic that AV is all over the place as far as quality control and consistancy..
 
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