93 Octane Not Recommended?

[dave6666]

So Tom for people who have the 87/89/93 Octane pumps in their area, are we better off blending 89 & 93, or just going with 89 and listening for knock?

Are you guys nuts??
Run the highest octane that your area has for sale!
It is a missprint!!

I'll pick "B"

 

[Tom F&L GoR]

It is not worth blending yourself; the 91 recommendation is a minimum after all.

However, it is nuts to think that searching out and using the absolute highest is automatically helping you in some fashion.

For an example of this, ask anyone that has used E85 how well it starts up when it is cool out and how much fuel dilution they have in the oil. Ethanol is high octane, poor volatility, high latent heat of vaporization, and stresses the engine oil. Or try straight toulene because it's also high octane, low volatility and ... Anyway, the point is that the OEMs have designed the fuel system for certain parameters beyond just octane and in some versions of gasoline, some characteristics are on the boundaries of what they want to see.

So now we can all go nuts again.

 

[Kmrumedy]

Everyone I know around here uses 94 octane in their cars.

 

[Tom F&L GoR]

OK, maybe I'm not explaining it well.

Why do all the people you know use 94 octane?

 

[dave6666]

OK, maybe I'm not explaining it well.

Why do all the people you know use 94 octane?

I think Tom, because they can.

As I explained, I use 93 because I don't want to use 89.

I think I have a good excuse, but just because?!?

Dunno about that.

Give 'em a lesson again!

 

[GTS Bruce]

I use Sunoco 93 because my puter was tuned to run on it by DC.Along with adjusting the fuel air curve and turning fans on sooner.Gained 20HP but more interesting it made the dyno run in 4th from 2500 to 6000 one second faster. GTS Bruce