**** The It"s Already August?? Train ****

[86 IROC-Z]

Fuel 100:

oh shit, it on fire!

[pajeff02]

Fuel 100:

oh shit, it on fire!

[Transamws6]

higher octane can handle the ignition being lit off sooner and more compression before it pops. More compression and ignition makes for more power. Alcohol (like ethanol) is a double whammy, it cools off the charge which again means more compression (or boost).

Had to read over that 4-5 times but I sort of understand a little better now.

So in plain english, what you're saying is, I guess.....the higher compression your motor has, the higher octane fuel it must run?

Like for example, I know my Dad's FJ run's on 93, while my truck run's on 87, and I'm guessing that's because of the compression differences between the 4.0 in his truck and the 5.3 in mines.

And I know with Alcohol, only engines with super high compression (I guess for example, some race built engines) can run off of it, I believe, like putting Alcohol into my truck would be a really bad thing. I could be 100% wrong about all of this since this is all new to me though.

[wheeliE-maxx]

your dad is wasting money unless it's supercharged. A 4.0 will run on cat piss. Your truck is e-85 ready brah.. Ours was atleast. Bumping the compression helps performance an efficiency with ethanol, but it's not mandatory

[Transamws6]

Fuel 101:

Octane simply reflects a fuel's resistance to pre-ignition, otherwise known as "knock". If the air-fuel mixture ignites before the piston has reached the proper location in the cylinder bore, it rattles the piston and cause the noise you hear. Higher octane fuels are resistant to pre-ignition, but they also burn more slowly once ignited. Therefore, you need to advance the timing to take advantage of the higher octane fuel.

Air-fuel ratios are described as lean, stoichiometric or rich. Stoichiometric is generally defined as 14.68 parts of air for every part of fuel, so 14.68:1. That is the optimum ratio to ensure a complete burn. If it is lean, there is to much air in the mixture and rich is too much fuel. Lean also leads to spark knock under load as the mixture ignites easier in an abundance of oxygen.

Adding things to the fuel, such as ethanol, changes the stoich point. A fuel containing 10% ethanol actually has a stoich of 14.2:1, meaning that it needs more fuel. Hence E85, which is 85% ethanol, needs to have an air-fuel ratio around 9.6:1 for proper combustion. That's why the guys that run E85 in the magazines have to ramp up their fuel systems.

Thanks for breaking it down, I don't have much else to say on this since it's going to take a while for me to fully understand what it all means, but I'll keep reading it over until I get it, which like I said, will take a while, this whole fuel thing is all new to me.

Thanks again for the help though, it's much appreciated.

[Mr. Luos]

lulz at the CETA chick trolling Tech for ass....

[wheeliE-maxx]

lulz at the CETA chick trolling Tech for ass....

I bet you'd experience a burning sensation after fucking the firebird chick

[Transamws6]

your dad is wasting money unless it's supercharged. A 4.0 will run on cat piss. Your truck is e-85 ready brah.. Ours was atleast. Bumping the compression helps performance an efficiency with ethanol, but it's not mandatory

Yeah, running 93 isn't really neccessary with his truck. But it's weird, he can run 87 octane if he wanted, but we've heard the truck get's a tad bit better MPG's on premium and will run better as well, and it says to use premium on the fuel door and in the owners manual.

But it's a known fact Toyota fills them up with 87 when you buy them from the dealer.

There is a lot of controversy on the FJ's fuel grade, but that's just a completley different topic than what we were orignally talking about.

[BdAsBrd01]

Since when the hell do roaches fly?!?! I go out to get some papers outta the Bird, make the mistake of turning on the porch light and sure as hell something flies in. I'm thinking one of those big ass moths til the wife dives off the couch and starts yelling about "what is that!" upon further investigation it's a flying roach! It's flat now, curtains halfway ripped outta the wall....

[Blackbird WS6]

[BdAsBrd01]

[Blackbird WS6]

[BdAsBrd01]

[Blackbird WS6]

[BdAsBrd01]

[Blackbird WS6]

[BdAsBrd01]

[Blackbird WS6]

:goodnite:

im a MOD

[BdAsBrd01]

im a MOD

Don't ban me bro

[Blackbird WS6]

Don't ban me bro

........for now