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Saturday Night Racer >> RACE TECH >> 110 octane race fuel or pump gas?
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Message started by dirt33 on 01/23/11 at 9:06am

Title: 110 octane race fuel or pump gas?
Post by dirt33 on 01/23/11 at 9:06am

When running in a Hobby class with a 9:1 350 and a Rochester 2 barrel, will using 110 octane gas accomplish anything at all over 93 octane, or is it simply a waste of an additional 5 bucks a gallon over the pump gas?

I've heard opinions on both sides of the equation. Just interested to hear what you guys think.

Thank you.

Title: Re: 110 octane race fuel or pump gas?
Post by over4t on 01/23/11 at 10:01am

Waste of money. Generally if your running 9 -91/2 engine you'll be fine on pump gas. We've run several engines like that over the years, tried both pump and 110 and saw no difference and the engines lived. Just like a street car, running premium in a car that calls for regular only lightens your wallet. But stay away from the generic no name gas stations. Stick to the Chevrons, Shells, etc.

Title: Re: 110 octane race fuel or pump gas?
Post by Andrew on 01/23/11 at 4:16pm

I don't know my compression ratio (never calculated it), but I started with a 9:1 engine and shaved .050 off the head, and I run 93 pump gas with no problem. I used to run race gas, 104 I think, but switched to pump gas 3 or 4 years ago. It's easier to deal with filling up too. Just pull into the station and fill 'er up. No more fuel jugs.

Title: Re: 110 octane race fuel or pump gas?
Post by Dietzsch_Racing25 on 01/24/11 at 9:49am

I agree. With 9-1/2 compression it is completely unnecessary.

CD

Title: Re: 110 octane race fuel or pump gas?
Post by harley83 on 01/24/11 at 11:08am

you can get 100 unleaded out of the pump in los banos lol... heres a link it has all the gas stations that have it at the pump...

http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal

Title: Re: 110 octane race fuel or pump gas?
Post by over4t on 01/24/11 at 3:30pm

Harley, that's good to know if you're out of town and can't get fuel at the track but it sure is pricey. Most tracks up here we get 110 or 112 Sunoco at the track for $7-8 a gallon. Paying more than that for 100 or less seems excessive. Dirt 33 and other low compression cars still don't need other than standard pump gas. Another $5 or$6 bucks a gallon over a season sure puts a crimp in the old budget and could get you some tires/shocks or whatever and make a real difference in how you run. Or splurge and take your volunteer crew out for a steak after a good night at the track.
That's always appreciated and will come back to you 100 times over.

Title: Re: 110 octane race fuel or pump gas?
Post by sj_valley_dave on 01/24/11 at 4:06pm

All the higher octane does is slow down the flame travel in the combustion chamber. A very high compression engine will "pre ignite" with too low of octane and the combustion basically is out of control. The high octane slows done this combustion, so if you do not need race gas, and 9.5:1 does not need it, you will actually see a decrease in power if you run an octane that is higher than you need. You will slow done the flame travel in thechamber and hurt power....That is why they have so many different octanes...You need to run the level that suits your engine....

Title: Re: 110 octane race fuel or pump gas?
Post by dirt33 on 01/24/11 at 4:56pm

Thanks for the help/ideas.