Race gas questions
Thread Starter
Racer
Joined: Oct 2006
Posts: 370
Likes: 1
From: St.Louis Missouri
Race gas questions
whats everyones view on RG is anyone using it? if so are you mixing or running it straight
any cels or anything from running it
i was thinking of maybe mixing in some 104 unleaded for friday or saturday nights...street racing in st.louis is pretty big so there is always somethen going on
also car will have a 100 dry shot on it in about 2 weeks
any cels or anything from running it
i was thinking of maybe mixing in some 104 unleaded for friday or saturday nights...street racing in st.louis is pretty big so there is always somethen going on
also car will have a 100 dry shot on it in about 2 weeks
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
We are a VP Racing Fuels distributer and a respected tuner shop. It would be a waste of money to use race gas for everyday driving. Your LS based motor will run fine on 92-93 octaine & should be tuned for it. Now, if we build you a higher compression motor & want to step up the timing....or a forced induction setup that you are going to thrash I would recomend 100-102 street blaze or similar. The reason would be to avoid detonation under a severe load. In a nutshell? Waste of money.
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Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
Originally Posted by I1uluz
Higher the octane slower it burns. If you don't need it it's a waste of money and most likely will slow you down. Plus if it's leaded it will kill your O2's.
Thread Starter
Racer
Joined: Oct 2006
Posts: 370
Likes: 1
From: St.Louis Missouri
im going to have to disagree as far as i know the higher the octane the slower it burns
i remember my buddy put 110 in his car and it would barly start cause he didnt have an ignition system that could handle it.just about killed his battery tryin to start it
i remember my buddy put 110 in his car and it would barly start cause he didnt have an ignition system that could handle it.just about killed his battery tryin to start it
Instructor
Joined: Sep 2006
Posts: 148
Likes: 0
From: Norfolk Va
Originally Posted by glass slipper
Octane is a measure of the fuel's resistance to self-ignite...it doesn't have anything to do with the burn rate. In fact, race fuel is ususally formulated to burn quicker because of the higher RPM race engines run at. I agree it's a waste of money for stock cars.
It seems that octane does not change the burn rate as I was told by "knowledgeable" friend. 
Here is an interesting link: http://www.motorcycle.com/mo/mcnuts/rt-fuel1.html
Not a bad way to start a Saturday learning something new.
Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
Originally Posted by I1uluz
After doing some reading I stand corrected It seems that octane does not change the burn rate as I was told by "knowledgeable" friend.
Here is an interesting link: http://www.motorcycle.com/mo/mcnuts/rt-fuel1.html
Not a bad way to start a Saturday learning something new.
It seems that octane does not change the burn rate as I was told by "knowledgeable" friend. Here is an interesting link: http://www.motorcycle.com/mo/mcnuts/rt-fuel1.html
Not a bad way to start a Saturday learning something new.
The 35-50 cm/sec flame speed he quoted (correctly) is the laminar flame speed for a mixture at Lambda=1.Then he went further to note the flame speed/propagation increases with turbulence. To expand on that a little, the difference in density between the burned mixture and the unburned mixture and the turbulence in the combustion chamber result in a higher flame area. This increases the heat flow to the unburned mixture causing combustion velocities typically between 2000 and 5000 cm/s, but higher is also possible (like in an F1/Indy engine). This is the reason we advance the timing up to ~2500 RPM then no more, in fact, some engines will make more HP if timing is pulled at higher RPMs (like 5000+).
Just thought I would throw in some numbers to add to his well written article. His analogy of gas being a chemical soup hit the nail on the head, the octane rating of gas is just a small part of the equation.
Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
Originally Posted by RDunn
im going to have to disagree as far as i know the higher the octane the slower it burns
i remember my buddy put 110 in his car and it would barly start cause he didnt have an ignition system that could handle it.just about killed his battery tryin to start it
i remember my buddy put 110 in his car and it would barly start cause he didnt have an ignition system that could handle it.just about killed his battery tryin to start it
This is a good link for him to read: http://www.idavette.net/hib/fuel/page2.htm
From the link about using AvGas in a car: "Aviation gas is formulated for large-bore, long-stroke, low rpm engines which run at high altitude. AvGas has lower volatility so, used in proportions higher than about 40%, part-throttle drivability and cold starts may be compromised. AvGas has a lower specific gravity so it will require a change in air-fuel ratio calibration for the engine to perform at its best. LL100 is blended with a high percentage of aromatics. That reduces throttle response–not really an issue with an aircraft engine but certainly an issue in a high-performance automotive engine."
Also, in addition to the excellent link I1uluz provided above, try this one: http://www.vpracingfuels.com/vp_01_fuels.html#unleaded
It shows the number of different types of fuel available with all kinds of different properties (burn rate being one of them). The paragraph at the bottom of the link says they can formulate whatever "soup" you want...just name your poison.
Melting Slicks
Joined: Oct 2006
Posts: 2,236
Likes: 0
From: Suisun City Ca
i mix 110 leaded with my 91 octane it is coming to about 95 octane this is mainly because in ca 91 is all we can get regularly at the pump this is on 12:1 compression n/a motor.. I agree with the above posts saying that you would be wasting your money on a fuel upgrade at this point there will be no gain without mods or tuning It wouldnt hurt to dump some 104 UNLEADED in if you wanted to smell it though say 2 gallons in a full tank! if you are running cats you should stay away from leaded
r.
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