Gasoline octane...

[Vtec1nspir3dCB7]

My question is, is it ABSOLUTELY required to run 93 in a stock h22?

[jdmboi type s]

wat u mean by 93??? 93 secs? im confus lol

[turbo90accord]

My question is, is it ABSOLUTELY required to run 93 in a stock h22?

no mid grade would be fine. Though it does have higher compression than an f22 its not to the point that using mid grade would cause any performance problems nor would it cause knocking/pinging which is seen sometimes in cars with very high compression ratios using low octane fuel.

[jdmboi type s]

o...lmao u mean on fuel ma b .........i forgot bout the topic........n no it could be mid like turboaccord said

[LeosCB7h22]

jdmboi is a 16 year old ricer.

[Vtec1nspir3dCB7]

I seem to think that i feel a difference from 89 - 93. I have no documented proof, but it feels like when i put 93 (OCTANE) in, i have more 'get up and go'.

but other factors apply. Temperture, altitude, humidity (I live in knoxville, tn Humidity is always above 70%...), fluid levels, pressure, etc...

[johnl]

higher octane is less resistant to detonation

No...

it takes slightly longer for the piston to reach it's peak so you need a gas that won't detonate too soon

No...

[johnl]

lol nah really tho im runnin on airplane gas....its like runnin nos on da car

No it's not...

[bcjammerx]

o...lmao u mean on fuel ma b .........i forgot bout the topic........n no it could be mid like turboaccord said

Your posts are full of stupidity....



THAT is a cell phone...you txt your friends on it...txt messages usually consist of shortened words and no grammer


Here at , we are not your friends...and what you are typing on is a

which actually has a spell checker

so stop being a total

or gtfo

[johnl]

i got airplane gas cuz a friend of mine has it on his rx7 rebuilt i recently got my h22a4 rebuilt wit a h23 head so i desided 2 do the same its not a ofen thin tho i just put it on the weekend wen im bout to race.....+ airplane gas is not cheap....lmao trust me

You are comparing apples and oranges. The question here is whether using higher octane fuel will be better than using lower octane fuel in an engine that runs happily on the lower octane fuel, not what will be needed in a modified engine.

If you have a highish or high CR then you will probably require higher octane fuel to avoid detonation. You won't be getting more power because you are using a high octane fuel, you will be getting more power because your engine has been modified, most probably including a CR increase (and supercharge boost in in effect a CR increase as far as detonation is concerned).

Even with no other mods, a higher CR results in a more efficient burn than a lower CR, so even though a higher octane fuel will typically have a slightly lesser energy content per CC of fuel, with a higher CR you get more power out of it because it's burnt more efficiently than with a lower CR.

Lower the CR while still using the higher octane fuel and you get a less efficient burn as well as a fuel with a lesser energy content...

Be aware that Avgas is a leaded fuel and thus will destroy the cat converter, not to mention any legalities associated with using it on the public road...

Note too that even very highly modified Wankel engines don't require particularly high octane fuels due to the very large combustion chamber surface area to volume ratio which causes a very strong 'quenching' effect, i.e. the very large combustion chamber surface area (which has a relatively low temperature) strongly cools the compressed air/fuel mix to the point that it cannot detonate even with quite high supercharge boost and CR.

This is also one reason why Wankel engines have relatively poor fuel economy and high hydrocarbon emmisions, i.e. because the quench effect is so strong that it prevents a significant proportion of the fuel from burning at all (let alone spontaneously exploding).

[johnl]

yea my car is tuned for it and yea i herd but fuk it...lol i always hav new parts n yea theres alot, alot of gains on it, its ridiculous

If your car is optimally 'tuned' to run Avgas then it's not surprising if you get less power from a lower octane (and possibly poor quality fuel relative to Avgas). If you run lower octane fuel and your engine has a knock sensor fitted then if the sensor detects any slight detonation the ECU will back off the ignition timing and power will drop. Even without any correction, if you are getting slight detonation then there will be a power drop off.

If we assume that detonation isn't an issue, then unless you have objective numbers to back up your claim (i.e. dyno or elapsed times using the different fuels with no other changes), then I suspect the biggest gain from using Avgas is placebo...

[megarock15]

nah im dead serious...i run my 90 ex swap cb7 on airplane gas on da weekend...no lie.....just incase some dumb idiots try 2 act dumb n race me hahhaha no chance...! like 2dai i race a rx7 turbo on da highway n smoke the shit out of him by like 8 car lanes lmaoo try tha on regular gas........

I think there was an episode of CSI were a kid used jet fuel in his EVO and guess what he got mad gains but he also died in a car fire

but if your tuned for it then please stomp holes in our asses

maybe in your wet dreams lol

[RagingAsian]

I use 89 from Chevron like crazy. I feel that Susie (my CB7) runs a lot better...havent had the guts to put 91 in her...yet.

[johnl]

I think there was an episode of CSI were a kid used jet fuel in his EVO and guess what he got mad gains but he also died in a car fire

Jet fuel is basically very clean kerosine. Using 'jet fuel' would make your car much safer because it doesn't ignite as easily or burn as fiercely as petrol ('gas'), and, the engine wouldn't start...