10.8/1 need race fuel?

[oregonrider89]

With a 10.8/1 comp. ratio should race gas be used? Thanks for your help guys.

oregonrider89

[Desert Rat]

No, I wouldn't think so. I would run premium pump gas (92-93 octane). Race gas would most likely be a waste of money be a waste of money.

[RiPPiNiTuP7]

Desert Rat is right, just use premium.

[OutlawEX]

I had a 11:1 and i ran 94octane,but anything lower than 92 made it run like poo

91+ should be fine:blah

[Dave400ex]

Rico has the 10.8:1 and he just mixes Race gas and Pump gas. Half and Half.....

[oynot400]

Is that in you 440 stroker? If it is, Powroll recommends race fuel with there stroker kits. So they told me when I talked with them. I don't know why if the compression is below 11:1 they still recommend it, but I think that Powroll probably knows what they are talking about so I would run it. I know that you spent too much money to risk a melt down.
Now if it for a stock stroked engine then premium should be fine.

[oregonrider89]

thanks for the replys. I'll just have to talk to Powroll and see what they have to say. I'd like to run 92+ but like oynot400 said, it not worth a meltdown.

oregonrider89

After you talk to them please post what they say is the reason the "stroke" would effect octane requirements and not the actual compression.

Only thing I can think of is they prep the motor so the piston to deck height brings the comp above the piston rating.

[Dave400ex]

Most gas stations will have 103 or 104. My brother just buys some 104 that is like $3.65 a gallon.

[oregonrider89]

I'm going to call tomorrow, I'll be sure to post my findings. I wish I could find 104 at a local station, I'll have to look harder.

oregonrider89

[TRXRacer1]

104+ at the pump isn't that common. You will find stations around race track areas with it though.

Now back to why you need it. The only thing you need high octane for is high heat. Extra compression causes higher heat due to the hotter blast. Suzukis new 400Z is 11:1 but doesn't need anything more than regular pump fuel. The reason for this is the liquid cooling. If you go 11:1 in an air cooled motor you'll need a little extra something if you ride it hard. The harder you ride it the hotter it gets unless you have a kick *** oil cooling system. Even then it's going to go up but not near as bad as strait air cooling. If you have a good true 10.8:1 and are just air cooled you'll want to at least run a very nice 93 or even blend in a little 104 with it. Running 93 one tank and then 104 the next won't do anything for you. It doesn't work like that. If the 93 works in your case then 104 would be a waste. You won't see any performance gains.

Remember when choosing fuel it's all about heat so if you think it's going to be running hotter for some reason then you better find the 104 pump at the station.

[Varmit57]

You guys are right about not needing race fuel for 11-1 compresion pistons. There was a artical sometime this last year in one of the big ATV mags that had a chart that said what octain to run for diffrent ratios.. If you run over that rating then it is wasted octane.

BUT, If you talk to most motor builders or experienced racers you will soon find out that most of them recomend running race fuel nomatter what the ratio of your engine is.

The extra octane may be wasted but your motor will produce more horsepower, run cooler and cleaner just from the quality of the race fuel. It is far superior to anything that you will find at a pump. I run Senoco Blue, I think it is rated at 110. I get it in a 55gal drum from a local gas and oil company. They even deliver it to me at no extra cost.....

[TRXRacer1]

The fuel is cleaner but you won't see an increase in hp.

[YZROOSTINYA]

i run pump(93 -94) and mix with 1 gallon 108 if i hit the track

[danney f]

Originally posted by Varmit57
I run Senoco Blue, I think it is rated at 110. I get it in a 55gal drum from a local gas and oil company. They even deliver it to me at no extra cost.....
How much does that run you? I buy my race gas at my local atv shop and it's $5 a gallon.

[oregonrider89]

I didn't get a chance to talk to Powroll, but Would an engine produce more hp on race fuel because it decreases the running temp.? Don't bikes that run cooler make more power? Just wondering.

oregonrider89

[Extremeracer167]

Race gas DOES make a differance. The power is alot more snappier, and it doesnt take nearly as long to get up into the higher revs. My engine will not run correctly on anything under 102 octane. It just spits, sputters, and pops. Like i have water in my gas. But then again, i run Klotz race gas and it is oxygenated. So thats my idea of race cas.

[Ryan]

Extremeracer, How much is it for that type of gas? And what compression are you running?

[Dave400ex]

Race Gas will only help, not hurt anything. It does cool your motor which helps it make power for a longer time. Our VP is about $35 for a 5 gallon container.

[Varmit57]

I get the senoco for $3/gal. I had to check around and talk to a few owners to get a deal but it is worth it.....

I have seen specs from some dyno test that prove power gains on race fuel...

[oregonrider89]

I talked to Powroll today, they said I should run race fuel with my stroker motor because of the comp. ratio. It wasn't because my engine got stroked. He said I should try to be around 104. Thanks for all the info from you guys.

oregonrider89

[AndrewRRR]

Oregonrider, too bad I just sold 10 gallons of VP C-14 (114) mixed with 10 gallons of 92 octane pump. 20 gallons of 104 octane (according to 76's race gas mix chart) for $40. hehe. I gave him a good deal because he's my cousin :p
I buy my race gas in Portland by the drum. I currently run 76's 110 competition. It's only $218 a barrel delievered whereas the VP i used to run went up to $380 a drum (jeez do they think their poo doesn't stink now or what???) and I had to go pick it up. We are even switching to 110 in the race car if it will run on 110 (it has 15:1 compression).
If you feel brave and want to try pump gas just listen to the motor for detonation, and do plug checks. Higher octane fuels burn slower and are therefore less prone to detonation at higher pressures.