amadormazdarx7

has anyone use 100 octane on there TII i have about 5 gallons of it that my buddy gave me. or mix it with 91 octane and 100 octane

NZ_87_TURBO

i only use 98 octane from BP ( here in NZ) its the ****. no mixing just pure 98. so 100 will be fine

Icemark

No point using a higher octane than the car will run on.

Remember the Octane has nothing to do with power or output.

Octane is simply the rating of the fuel that resists detonation/explosion on compression.

So using a higher octane than the motor is tuned for will actually result in lower power and increased emissions (and usually increased ash/deposit build up) on a rotary motor due to the unburned amounts of fuel.

With a rotary motor, you want the gas to burn at the highest compression point, not to resist burning. On a non turbo you actually will get more power output on 86-87 octane than you will on 91-92 octane.

Higher Octane = more resistance to detonating under compression before the spark ignites it.

dwb87

iTrader: (22)

Icemark = genius

sniperstevedave

But you can run higher boost with a higher octane fuel, since it is less likely to knock. Anti-knocking is the whole point of higher octane.

Higher Octane = less chance of premature combustion. A properly tuned engine will ignite the air-fuel mixture at the point of highest compression, octane only prevents it from igniting before the spark plugs fire.

Octane numbers are based on the anti-knocking properties of the fuel relative to pure octane hydrocarbon fuel (i.e. hydrocarbon chains with eight carbon atoms).

If you tune the car for higher octane fuel, you will get more power. If you don't tune it, less power.

rx7 FC TII

iTrader: (3)

fc3sna

i ran 110 leaded on my na didnt do much, made it smell like a sweet race car, j/k i think i ran it twice to help clean the carbon. not sure if it helped in the killing of my coolent seals. ohh well. ohh and i had a stright pipe exhaust, so no emissions to clog, of fug up

sniperstevedave

Did you say leaded?!!!! Why would you run leaded fuel (and where would you get it, anyway) when the owners manual says not to? Oh, sure, if you removed all your emissions parts you can't screw them up anymore, but again, why?

Fumi

yeah leaded.
airplanes still run with leaded fuel.
and as long as your cats are removed than running leaded is fine.

Evil Aviator

Maybe so, but the genius should maybe differentiate between "explode" and "burn" so that the noobs don't go around thinking that they want to fuel to explode in their motor, lol.

snowball

lets not forget NZ 98 is about our 93 (RON vs. MON) you can subtract about 8 from the rest of the worlds rating to get US and canada.

citgo's around here sell 110 unleaded (MON) for about $4 a gallon (3.99 last time i bought) its fun runing 30psi. (not in the rx7)

fc3sna

the sunoco up in melborne sells it, i think its kinda expensive. i belive any thing over 100 is leaded, but i might be wrong. air planes take 100 low lead.

PDViper77

iTrader: (9)

Where is the gas station that sells this?

snowball

you can get unleaded over 100. VP racing fuels has some that are over 100.
not to mention other fuels like E85 are 105-110.

papsmagu

iTrader: (19)

we have many here in so. florida. i personally run 100 unleaded. i have also run C16 but that is leaded. i have heard that the life of the widebands is greatly reduced if you run leaded gas. the 100 unleaded is $4.85/gallon

Icemark

yeah, there... I fixed it.

Although both are technically correct. The mixture explodes.

From American Hertiage Dictionary:

Quote:

ex·plode (k-spld) Pronunciation Key Audio pronunciation of "explode" [P]
v. ex·plod·ed, ex·plod·ing, ex·plodes
v. intr.

1. To release mechanical, chemical, or nuclear energy by the sudden production of gases in a confined space: The bomb exploded.

From Merriam-Webster's Medical Dictionary:

Quote:

Main Entry: ex·plode
Pronunciation: ik-'splOd
Function: verb
Inflected Forms: ex·plod·ed; ex·plod·ing
: to undergo a rapid chemical or nuclear reaction with the production of noise, heat, and violent expansion of gases <dynamite explodes> <an atomic bomb explodes>

From Dictionary.com:

Quote:

ex‧plode  /ɪkˈsploʊd/ Pronunciation Key - Show Spelled Pronunciation[ik-splohd] Pronunciation Key - Show IPA Pronunciation verb, -plod‧ed, -plod‧ing.
–verb (used without object)
1. to expand with force and noise because of rapid chemical change or decomposition, as gunpowder or nitroglycerine (opposed to implode).

mightymite

iTrader: (1)

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs

sniperstevedave

The correct term is deflagration- subsonic combustion. A true explosion is a detonation, a supersonic process in which unstable molecules decompose into hot gasses.

http://en.wikipedia.org/wiki/Deflagration

Sorry Icemark, you are going to have to give this one up. It's my fault, I just have to nitpick improper usage. It is an engineer thing.

J-Rat

iTrader: (2)

I ran 103 when I hit 434..

staticguitar313

iTrader: (2)

i run 87
(to end the who's got the biggest . . . octaine contest)

robrxray

heard to run aviation fuel 1x a year to clear carbon buildup out of internals. should you race on that tank of fuel or just use racegas for a few passes.

fc3sna

the sunoco in front of county line by i 95 has 100 and 110; the pumps look diff from the rest there

slo

iTrader: (1)

I'm not sure what octane it is, but I ran deisel fuel once in my first gen when I ran out of gas near a rest stop (sold to me by a trucker). The car smoked some and was way down on power but it got me to a gas station (60 miles or so).

Sideways7

iTrader: (7)

Wow, I'm suprised it ran at all. Diesel doesn't like igniting very much, which explains your major lack of power.

PDViper77

iTrader: (9)

wow, that is just down the street from me. I live on palm bay rd. I will have to go check it out. Thanks