will i actually get more miles per tank on 93 octane than 89 with my stock 94 cx?

 

No, use 87. You're wasting money on the 93.

 

Theoretically, you should use the lowest possible octane you can get away with on a motor for most efficency.
Dan

 

Try it for your self, and let us know. I personally got about 500+km easyper tank with my D16Z6 on both reg and premium. Now with B16 and low final drive I am happy with 500 even, thats on Premium. Cant run regular to test.

 

Yea gas mileage is a factor for most of us. Buuuuttttt if you wanna just go all out on payday hit sunoco up and get 98 im sure you will like that

 

your cx motor shouldn't need anything more than 87...

 

With a stock car always use the recommended octane. To my understanding, the higher the octane the harder it is for the fuel to ignite (which is why people runnin boost use for their very high compression, or people with un-boosted high compression to avoid preignition)

So, unless your car has high compression it will have a harder time ingiting the air/fuel. it could actually lower your mileage.

Honda knows what theyre doing, listen to them

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by generation7 &raquo;</TD></TR><TR><TD CLASS="quote">With a stock car always use the recommended octane. To my understanding, the higher the octane the harder it is for the fuel to ignite (which is why people runnin boost use for their very high compression, or people with un-boosted high compression to avoid preignition)

So, unless your car has high compression it will have a harder time ingiting the air/fuel. it could actually lower your mileage.

Honda knows what theyre doing, listen to them </TD></TR></TABLE>
You're a smart bastard. Generation7 is absolutely right. I should also add, it takes longer to burn too.
Dan

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by generation7 &raquo;</TD></TR><TR><TD CLASS="quote">With a stock car always use the recommended octane. To my understanding, the higher the octane the harder it is for the fuel to ignite (which is why people runnin boost use for their very high compression, or people with un-boosted high compression to avoid preignition)

So, unless your car has high compression it will have a harder time ingiting the air/fuel. it could actually lower your mileage.

Honda knows what theyre doing, listen to them </TD></TR></TABLE>

I second that....It's a perfect explanation

 

With that said what is the recommended fuel for a d16Z6

 

86 Pump Octane Number, 91 Reseach Octane Number or higher is what it recommends in the Helms.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blurrrcivic94 &raquo;</TD></TR><TR><TD CLASS="quote">your cx motor shouldn't need anything more than 87...</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rw92civic &raquo;</TD></TR><TR><TD CLASS="quote">

Your CX shouldn't need anything more than 87 </TD></TR></TABLE>

Or else your just throwing your money away....if your gonna do that I'll take the few cents of every gallon you use to fill up...and soon I will have something new for my car....mwahahah....But seriously don't throw your money away

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rawkus &raquo;</TD></TR><TR><TD CLASS="quote">Theoretically, you should use the lowest possible octane you can get away with on a motor for most efficency.
Dan</TD></TR></TABLE>

No, not theoretically. Realistically.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92b16vx &raquo;</TD></TR><TR><TD CLASS="quote">86 Pump Octane Number, 91 Reseach Octane Number or higher is what it recommends in the Helms.</TD></TR></TABLE>

That doesn't help because most (or all?) U.S. pumps don't use either of those rating systems alone. Here in Cali., at least, they use the Research Octane Number + Motor Octane Number divided by 2, method. Or R+D/2 method...which is obviously just the average rating of the Motor Octane and Research Octane ratings.

I haven't done very much research on the subject, but everyone's right. If you have a stock D16 motor, or any stock motor, put the factory-recommended fuel in there. No more, no less.

I'm sure if you had searched you would have found the answer to your question easily, as you're not the first to have asked it.

If you need a further simple explanation, the higher the octane rating, the higher the resistance to combustion the fuel has. Fuel needs to be able to resist a certain amount of heat due to the compression stroke of the piston cycle. Physics and Chemistry 101- the more you compress something the hotter it gets.

So for example if you have a high compression motor (as in the air/fuel mixture gets compressed ..a lot more than a lower compression motor)..say, 13:1 compression for example, and you throw in 87 Octane fuel in there, the compression stroke of the piston will heat that fuel up enough for it to spontaneously combust, usually while the piston is still well on its way UP and before the spark plug could even do its job, and thus creating a downward force acting against the ideal travel of the piston.

The result is what you call "engine ping" or the many names they have for it, and power loss, and blah blah blah.

On the other hand, if you have say a 8:1 compression motor, and you put 91 Octane fuel in there, you're wasting money and valuable fuel, first of all. And the fuel itself will have TOO much heat resistance for your poor motor to fully burn it. And i've heard this results in unburnt fuel deposits on your valves, and wears out your catalytic converter prematurely since you're sending unburnt fuel out through the exhaust.


Modified by Screwtape: at 11:59 PM 6/15/2005