do they still sell this by the gallon and does anyone know where to get it?

 

Look around for a station that sells E85.

http://www.eere.energy.gov/afdc/infr...e/locator.html

 

Alternatively, you could just buy some toluol in a hardware or paint store, though if you need a lot of booster, E85 would most likely be cheaper.

 

I used to get small quantities of aviation fuel to run in a high compression engine many years ago when the local station was out of 115 octane fuel. It is highly illegal to use avgas in a street vehicle. Avgas may not even be high octane anymore. I am sure it would be difficult to obtain. Racing fuel may still be available in 5-gallon cans but it has been years since I have seen any.

 

The local Olympic station here has 104 octane (unleaded) and 114 octane (leaded) for $6- $7 a gallon. They keep it 55 gallon drums in back.

A couple of local speed shops sell 101 octane(unleaded) in 5 gallon cans for about $35.

What octane level of gas are you looking to run?

Tim

 

my guess would be around 100 octane as it barly pings on the 93 but i also have the timing retarted etc. on a side note i did some research and avgas is 105 octane now so i think i may try adding some of that to each tank. I have a 16 gallon tank, just not sure how much to add.

 

You need to know what you have.
For some reading on the subject try:
http://www.csgnetwork.com/avgas.html
http://www.idavette.net/hib/fuel/
http://www.idavette.net/hib/fuel/page2.htm

Then go here:
http://www.freemathhelp.com/algebra-help.html

 

When determining octane levels you add the total octane in the tank and divide by the number of gallons.

10 gal @ 105 Octane = 1050
6 gal @ 93 octane = 558

1050 + 558 = 1608

1608 divided by 16 gallons = 100.5 octane rating.

"Barely pinging" will probably be remedied by bumping your octane rating by less than 1 point. From what I understand the octane boosters on the market boost your octane by .1 - So you would need a lot of octane boost to raise your octane level even one point.

Can you fix the pinging another way? It could be really expensive to run 100 octane gas all the time.

 

i basicaly bought a 55 gallon drum of av gas and im seeing how that works out. I started out with 1 gallon still pinged some, 2 gallons got better. but i think my carb jetting is a tad lean on my holley as the idle screws are all the way out and if you turn them in it shuts off. I checked and turning them out richens it so i ordered like 2 jet sizes bigger, it had .72 so i ordered .75 which is also whats in the back. Ill put them in then go from there on working with the ping. im guessing the most ill have to add is 5 gallons to a tank but im hoping it ends up at the most 3 gallons a tank. I can tell you though the truck feels way more powerful already with most of the ping gone and being able to set the timing about where it should be. Running a mechanical advance brand new msd 10 base timing with 34 total advance atm.

 

Rather than have a 55 gallon bomb sitting around, you might try VP Fuels C5 gas additive. It pulls the octane rating 30 points. It's the only way I can keep my highly modded 390 from knocking and pinging. I can tell when it gets to the carb.
http://www.vpracingfuels.com/vp_03_chemicals.html


Might even be cheaper than the avgas but it is not for an engine with a cat converter.

 

What's a 'point'?

If I add 30 points to 93 octane, what is the final rating?

 

interesting i wonder what octane it would raise 16 gallons of 93 octane to

 

A "point" is usually 1/10 of a percent or in this case 1/10 of an octane number.

Check out that math site for your mixture problems. Math is good exercise for the brain.

 

The "point" I was referring to is probably incorrect terminology. What I was referring to is the change in octane levels. 93 octane to 94 octane would be a change of 1 "point". Again I'm not sure is that is the proper way to describe the change.

Octane rating is calculated by adding the total octane "points" and dividing by total gallons.

1 gallon of 90 octane + 1 gallon of 100 octane gives 190 octane "points". Take that 190 and divide by 2 gallons and you get an octane rating of 95.

So in order to calculate the octane rating when mixing gas with different octane ratings you need to know how much of each type of gas you're using.

EDIT: after posting this I see torque 1st has cleared up the terminology.

Tim

 

Nah, You were using the same terminology as on the web site. That's fine. To quote the ad:

"Raises octane up to 30 points for increased performance "

From Torque1st's description, 30 points would give you an increase of 3 octane numbers. IE 1 point = 0.1 octane number so 30 points * 0.1 = 3.0 octane number. SO adding 30 points to 93 octane gas gets you 96 octane gas. The point being 93 octane will not become 123 octane by adding this stuff.

It is probably a good product and will work as it was designed. It's just sometimes the advertizing is unclear at best or downright misleading at worst.