NoSpleeny

In my first post.. I said that "only" if your engine asks for "Super" grade fuel, do you actually need it. Maybe in Japan, all the grades of fuel start from "Super".


If I don't remember wrong... Diesel fuel is like 110 octane? Look at all that black smoke coming out... I believe there was a study that showed that higher octane polutes more than lower octane. Maybe in the 94.. because it's so dirty.. they added emission cleaners and stuff.. I have no idea. I'll do some more research.

If the lowest octane in Japan is 94....... and 94 is cleaner (cuz it's higher octane).. why is the smog levels in Japan ... ahem... crap? To be honest.. our smog days must not even be half as bad as the smog days in Japan. If I don't recall wrong.. our air pollution index goes to like 50 on bad days.. but goes to like 90 in Japan. (32 is Satisfactory)

coupe95

I wasn't posting the first part of my post to you it was directed towards rice burner.

Now the second part which was directed towards you I say that, that is what Sunoco states I'm not sure if it's true or not. But think about it, with all of the emissions **** getting out of hand recently and Ontario being so strict with that **** don't you think the government would flip out if they said it was less pollutant but in actuality it was more? Juss my 0.02 but in all fairness I don't know so you could very well be right

neilff

fill up with high octane, reset your ecu
it'll adjust to the new octane, and you get 'free' power...

i read that somewhere

electronblue

iTrader: (1)

Ultra 94 about 90% of the time, if I'm not near a Sunoco, I'll use whatever Premium.

coupe95 you are correct, higher compression engines require the higher octane fuel, that is why my owner's manual tells me to use 91 octane or higher.

electronblue

iTrader: (1)

No Spleeny
The smog in Japan is so much more than ours because of the population, they have more people in less space!!!!

imported_eth0r

yup.. higher the octane the more pure the gas is

NoSpleeny

Higher compression engines require better fuel. That is correct... but I'm saying if you drive a car that says you only need 87 octane in the manual.. you don't necessarly need high grade fuel.

Even some lower compression cars need super fuel.

If I'm not mistaken.. the WRX is 8.3:1 compression before the turbo boost.. and that requires premium... partly cuz the compression is way above that when the turbo kicks in.

NoSpleeny

If that's the case.. why can't we gas up with Diesel? That stuff has more octane than ultra 94 + those NoS octane booster bottles.

electronblue

iTrader: (1)

Here is a link for octane levels in fuel: It is a pretty long Q & A so I'll just post the link

http://www.total.co.za/External_cont...rol_octane.htm

electronblue

iTrader: (1)

I just found out that octane has nothing to do with cleaner air, emissions are caused by how your car burns the fuel and how it distributes the by products. Actually from reading some of these sites, the lower emission cars use lower octane gas. But they are lower compression, not boosted engines. (lower performance??)

As for diesel it is a totally different refinement process from that of regular gas.

Buddah

NoSpleeny...yes, this is correct. My car only requires 87 octane unleaded fuel but, because I work on my own car, I like to keep my car clean and running properly...so I spend the extra money to ensure that future problems can be minimized.

Buddah

Try it...I had one client do that and we discovered he was running diesel fuel in an unleaded fuel running engine...the damn thing blew up sky high. There are more volitial organic compounds in diesel fuel...the combustion process found in an unleaded fuel burning engine is not the proper way to combust diesel fuel. This is why we don't put diesel fuel in our engines. If you do by mistake, take a hole and funnel it out quickly...you can "seriously" damage your engine.

Buddah

yes, this is true. Emissions are caused by how your car burns the fuel and distributes the by products. But, if your emission systems are working up to par, and are registered for regular cheap unleaded fuel (dirty fuel), it goes to say that, with ultra 94(cleaner fuel), the emissions will be cleaner of volitile organic compounds (VOCs) being that it takes less gas to travel as you would usually need to because of a slightly higher performance ratio and cleaner burning process. Since it is Volitile Organic Compounds (VOCs) and Ozone (Oz) that combine in the presence of sunlight to create smog, if you have less VOCs, there is less chance of smog. That's why I recommend to all my clients before they take an etest is to do an oil change, top up on 94, make sure your plugs are clean or replaced, check your wires, and top up all your fluids. For an older car or otherwise, this is the best course of action.

imported_gatherer

the higher the octane level the slower the burn rate ... the timing has to be corrected for the type of gas you use...

Buddah

I would think it has a higher burn rate. Being that higher octane burns better ergo, faster and therefore have a higher/faster burn rate. True???

NoSpleeny

Apparently not. Gatherer must have heard or read it somewhere....

I've heard and read it somewhere ALSO that higher octane fuel burns slower than lower octane fuel... Cetane fuel burns EVEN slower than octane fuel.

Buddah

Alright, if this was true, then why would cars that require premium gas need it then??? If it burns slower, then it robs of horsepower. So for a car that needs 91 octane, it would gain horsepower from 87 octane because it burns faster....according to your statement. But, we all know this is not true. So, why would you think it burns slower??? Where ever you read this, I'd like to read it too...if you can please find the link or picture of what you read...It would be interesting to read.

What you may have read is higher octane burns slower as far as how much fuel pressure you need and therefore save on gas mileage.

NoSpleeny

Hrm..

I'll try and find it but for now.. I'll theorize... it could be that if the compression is LOWER then it burns slower.. but when the compression is higher.. it burns just as fast?? I dunno...

You can consider Napalm a really thick gasoline I guess.. that burns pretty slow...

I would imagine higher octane would give you more torque because it's slower burning.. I dunno... I'm guessing at these things. I'll read up more and give you the article if I see it.

imported_gatherer

thats one of the stupid things about the octane system however the higher octane burns slower...lets think of it logically

if you use pump gas (87), with the stock honda engines you leave the timing alone no need to play with it factory timing is fine.

lets say you use 110 octane race fuel, what way do you change your timing ...advance or retard?

you advance your timing, this is so that the spark happens sooner in the cycle allowing more time for the crank shaft to move into the best position to be in when the combustion chamber reaches maximum pressure.... therefore if the combustion chamber is taking longerto reach that max pressure and therefore the gases must be burning slower...

the higher the octane the slower the burn rate... on Diesel fuel is more stable then the unleaded gas thats part of the reason diesel engines have a huge compression ratio of 40:1 or more

NoSpleeny

That's also why their strokes can be HUGE.. therefore outputting TONNES of torque!