Nova_Dust

Lately, I just felt like using 94 Ultra gasoline, just for a change I guess.

Although the small D block doesn't require such high octane gasoline, but I figure, it must do the engine good regardless. I did notice a small improvement in response when I start on first gear. Sometimes, I get that "power cut-off" during 1st gear start. Not that severe, but just a little. Lately, that problem has improved a little. But that could be other things, I need to clean the throttle body and change other stuff...

I figure, if I quit buying cigarettes, the money I saved can contribute partially into the more expensive gasoline. Hey, it does both my body and the car good.

1niceSi

Charles....read this....especially what MY SiR writes....Mark knows his **** Yo!!LOL

http://www.torontocivics.com/tccforums/showthread.php?s=&threadid=9233

BOND007

click here

its easier than cut and paste

1niceSi

thanks Neil....I never knew how to do that.

BOND007

No problem brother

electronblue

iTrader: (1)

I run Sunoco 94 only. However unlike a civic, the Prelude requires 91 or higher. In the beginning I used 92, but I've noticed a difference in power using the 94 due to the ethanol. I also get 50 km less per tank from the faster burn Ah well, small price to pay!!!

Nova_Dust

DUH!

So... D16 with low compression doesn't need 94 Ultra fuel, now does it? Am I just wasting my money? Like it makes absolutely no difference to the engine? Will it burn well and leave less residue behind?

mmm..... if it is (which sounds like it) true, then I am just gonna go back to Shell 87.

dingus8

50 km's due to fast burn eh.....well the higher the octane the slower the burn is...jsut alittle info for ya prelude person

imported_jaysi

I think better wording would be higher octane gas is more resistant to ignition. Once it ignites it burns the same as any other octane gas.

Only explaintation I have for electronblue is maybe she's putting her foot down harder with the thought of the high octance gas giving more power? As stated by MYSIR in the link above Dunno...

Konig

That's odd because when I started to use the super gas at Esso my fuel milage went up about 80km per tank. Thats was on my D16. I will let you know what my B16 goes to when it gets on the road....

imported_MY SiR

Konig,

Umm, if you believe anything I say, you should only be using high octane in a B16. High octane is specified for that engine. I can almost guarantee that using lower octane gas will give you worse mileage than with 91+. My car has a B16. In my previous thread, I wrote an SOHC engine would be fine on regular, a B16 is DOHC and it requires the expensive stuff....

jaysi,

About electronblue's comment, she is right about the fast burning. I think you got confused about the octane part... Sunoco, achieves their 94 octane by adding ethanol (a type of alcohol) to their gasoline. The higher octane doesn't add power but the alcohol does... Alcohol actually burns better than gasoline however, for the equivalent of 1.0 litre of gasoline, you would have to burn about 1.3 litres of alcohol. Since Sunoco uses a "blend", of alcohol and gasoline, it burns faster than other gasolines... That is what electronblue meant by the 'faster burning". You are right, it isn't because of the octane, it is because of the alcohol....

Why isn't pure alcohol used?
1. Cost...more expensive (why do you think only Sunoco does it?)
2. There are starting issues in cold.
3. When it burns, the flames are not visible.
I think there are more but I can't think of any right now...

Mark

imported_SiR_YO

wow.. so much info on gas... good stuff Mark.. so you only use Ultra 94 on your SiR??.. my car hasn't even seen anything lower than 94 other than what the dealer put in it in the beginning.. I'm willing to pay that extra $2-3 every fill up just to treat my baby

even though my k20a3 doesn't REQUIRE Ultra 94.. I still love it..

Konig

Okay I will use the good stuff. Thanks for the heads up......

imported_MY SiR

SiR_YO,

I use 94 octane on occasion. I usually, use 91 or 92 (depending on the station). I am fine with less power and longer driving range when I am using my car for just commuting.

Yeah, your car doesn't specify high octane. It just needs regular...

Mark

CoconutDaniel

yeah quit smoking or else you'll kill someone

dingus8

almsst all gas now aday has ethanol...pure alcohol burns cold it more stable...but will turn to gel.....ethanol is garbage and dosen't do anythign as fare as octane rating is it basically dilutign the gas for enviro issues and what not....and the higher tha octane the slower the burn and higher resistance to combustion hence it won't prematurly ignite and cause detonation which is the pistons is still comign up in the stroke but the mix ignites so it pounds on the pisotn because the force can not be released by the piston moving down so it takes all the force...that's why you will see chunks outta the pistons....kapeesh guy's....

electronblue

iTrader: (1)

Actually the truth is Ultra 94 contains increased ethanol content, which causes faster ignition, thus some people may even feel an increase in power (very minor).

So for me going from the Sunoco 92 and getting approx. 450 km to the tank vs. Sunoco Ultra 94 and getting approx. 400 km to the tank.

I have noticed a 10% decrease in km/tank using Ultra 94 due to the higher alcohol content, but it is worth it for the decrease in lag when you put your foot on the gas pedal.

The way I see it, if my car called for regular gas, I would use regular, but the Prelude calls for premium only so I might as well use 94 for the increase in percentage in CAA discounts

dingus8

ethanol is not a "performance adder"....it is in gas to dilute is so we are usign less gasoline....for enviro issues....it doesn't promote faster ignition...I'd use it dont' get me wrong but I jsut statign a few things to edjimecate peopel

imported_MY SiR

And you you got your edjimecation from where?

Can you explain then, what Sunoco uses to improve their octane if ethanol doesn't do it as you claim? I beg to differ. If you don't belive me, take a look at this site:

http://www.ethanolrfa.org/student_perf.html

For those of you who are too lazy to look, here is a quote:

"How Ethanol Works in Your Car: Ethanol is an alcohol fuel that provides octane when blended with gasoline, improving your car’s engine performance. Henry Ford designed his 1908 Model T to run on alcohol, proclaiming it the “fuel of the future.” And several teams in national and international racing competitions use ethanol because of its high octane (ethanol has a 113 octane rating) and exceptional performance. "

To me, adding something that has a 113 octane rating should be able to improve the octane rating of gasoline. I don't understand how it can't....

Mark

bbarbulo

iTrader: (2)

Ohhh.... I was on this ethanol fuel conversion team in university.... GM gave us a new Silverado and we had to convert it from gas to use E85 - 85% ethanol blend. The obvious problem was cold starting... it was a pig. And we couldn't use glowplugs, cuz they wanted the truck to be seamless as if it was running gasoline. So the Ethanol had to be warmed up for easier cold starts. The octane rating is higher. Ford has ethanol technology currently to run E85 (and has had it for many years BTW). This post is off topic... sorry.

Use what your manual tells you to use. Only diff that you or your motor will notice is knock resistance when it comes to higher octane. I'm obviously oversimplifying it... the EGT will also be cooler with higher octane, which theoretically lowers NOx emissions.