The heat will be in your headers, and will be visible as a cherry red glow.
Any octane above that needed to stop pinging at whatever timing setting you use, will be a waste.

 

heat is the by product of power. gasoline engines have an efficency rate of around 33%, the rest of the energy is wasted on heat. the reason why u see headers glowing red on cars running race gas is cause they produce lots of power, and in turn even more heat. the reason y u don't see headers glowing red on cars that are running pump gas is cause they are usually not making enough power to produce enough heat to make the headers glow red.

do some research before u come out making statements like that. email some of the race gas manufactureres (such as torco fuels, rocket brand fuels, etc.) and ask them what properties set apart high and low octane fuel

 

I said, and still say, that having much higher octane than your car can use, will lead to higher temp. The exhaust will be rich, and headers will glow. When I posted to this effect you said it was "The worst lie the devil ever told" and that it would run cooler......now, you say it will run hotter.

I am quoting both your posts, you decided what side you want to argue about please, Hotter or colder? and have you ever run 108 octane uncut?



First quote from you


Second quote.

 

what i was saying was the a 300 hp pump gas engine is gonna put out less heat then a 900 hp race gas engine. thats why u need race gas in the 900hp engine, to help it cool, to counter act the detnation. but if u put 100 octane in a 300 hp engine, then put in 110 octane the next time u fill up, ur egt's (exhaust gas temp, or in the headers like u were saying) will be cooler with the 110 octane, and it will make a little less power cause the fuel is burning slower.


like u said, u don't wanna go a higher octane than the minimum needed to counter the pinging, cause the higher octane than whatever u need will burn slower and cooler and not make as much power as u would with a lower octane (but still high enough to counter the pinging)

 

It stops premature autoignition, but if the engine isn't set up to take advantage of that high octane fuel....what happens? It makes for over rich exhaust, the kind that burns on it's way out the headers.
If you have ever seen someone with a spark plug in the tail pipe....it's the same thing...only it's burning on it's own.

And, having run 100 octane gas in a 400+ HP engine, and also run 108 octane in the same engine, I can verify that the 108 turns the headers red whereas the 100 octane did not.

 

wouldn't leaded fuel make your car heavier? since it has lead in it?

i'm a noob....so explain it

 

the lead is just a lube, you shouldn't need any explaination of lubes

 

actually I always understood higher octane to equate to higher ignition point (nothing to do with burn rate per se, but not saying it isn't related). I do know that lower octane fuels are more prone to preignition from hot spots in the cylinder, which of course can lead to knock.

the only reason you want higher octane (that I have ever read) is to avoid detonation/knock/ping.

and what about methanol as an octane booster? cheap and efficient - just don't drink it!

higher octane WILL NOT change your AFR (will not make your car run rich). that would imply that less fuel is utilized in the burning process, which is not the case. the same amount of fuel is pushed through the cylinder and ignited by the spark.

 

the only reason you want higher octane (that I have ever read) is to avoid detonation/knock/ping.
Yes, and the higher compression the higher octane you need to do the job

methanol, while I have not used it, is for applications above 18-1, it it harder to ignite.

 

If you run 110+ it will ruin your o2 in a month or so, but if you put it in every other week or so it should last a few months plus.. the normal average of a 02 sensor is 100,000 miles on pump. Plus they are 125 some dollars if they go out, and if you have the money to run race gas all the time you can afford 125 a month or so lol. The main point is that it is ALOT safer for the car if you run higher octane... An alternative source is a methanol injection kit hell than you can even run lower than premium.

I am running 109 unleaded right now and the car is running very smooth and making good power. I am making 550rwhp and 542rwtq @19psi.. my turbo is a piece of chit so that explains the high boost, there is not that much difference in power between 109 and 116 with vp racing gas.

 

ok, on the original subject u win, i am wrong, you are right. running to high octane fuel will lead to more heat. i wasn't thinking right

however what u just said tells that higher octane fuel burns slower than lower octane fuel. if it doesnt get burned completely in the combustion chamber, and is still burning in the exhaust, that says that its not burning fast enough.

however, i still stand my original post on saying that higher octane burns cooler. the reason (as u said) ur headers were turning red is cause the fuel was still burning in ur headers, not because the fuel was burning hotter, where as the lower octane was finished burning in the combustion chamber, and ur headers didn't turn red.

i guess in a way we were arguing opposite sides of the same coin

 

good enough. now we will find some gas and see what makes flamming kittens jump higher

http://smacbroon.netfirms.com/broon/catshoot.html

 

Xylene does not have lead in it and you can buy a gallon at a paint store that sells auto paint for 5$ a gallon. I used to mix 2 gallons with 10 gallons of 91 in my 928 to advance the timing. Xylene is highly refined mineral spirits. You can also order a 50 gallon drum of it from paint store and make your own race fuel.

Formula (R+M)/2 Cost Mixtures with 92 Octane Premium Note
10% 20% 30%
Toluene 114 $2.50/gal 94.2 Octane 96.4 Octane 98.6 Octane
Xylene 117 $2.75/gal 94.5 Octane 97.0 Octane 99.5 Octane

 

Save for the HAZMAT shipping fee, puts the cost of Xylene well beyond reasonable. The Sherwin Williams Auto paint store sells the crap at $7.99/gal, but if you have a link for somewhere less expensive, we'd be eager for you to share

 

Heh try another store. I remember the last time i bought it was around 5-6$ for a gallon and they told me i could get a 50 gallon barrel shipped to thier store then pick it up. The cost came out to around 2.50 or so a gallon getting it in bulk. Stores like sherwin williams can set thier own resale price. You could try Toluene and see if its cheaper. An independant store might be able to get it cheaper than a chain store. If you do not get it shipped to your house you should be able to avoid the hazmat fee.

 

I have 7K miles on 110 and no O2 sensor issues.. That's 7K with no mix...

 

why are you running 110 uncut with stock compression? that extra money could be getting saved up for forged parts when you rebuild.