<VV> OCTANE CALCULATION

[J R Read_HML]

It is more the accumulated price differential over time that irks me a bit. 
What does the hose hold?  A pint, a quart?  Actually, it needs to be 
measured form the "blender" inside the pump.

Attachments (if any) are scanned with anti-virus software.

Later, JR

----- Original Message ----- 
From: "Jim Burkhard" <burkhard at rochester.rr.com>
Cc: "J R Read_HML" <hmlinc at sbcglobal.net>; <VirtualVairs at corvair.org>
Sent: Wednesday, September 07, 2005 7:03 PM
Subject: Re: <VV> OCTANE CALCULATION


> Strictly speaking, with mixes as you describe, one needs to perform to 
> same  onerous laboratory Motor and Research tests with a CFR engine to 
> calculate the new octane. That's because 93 (or whatever) octane fuel from 
> one station at a point in time is not necessarily the same 93 octane fuel 
> from a different sdtation at a different point in time and it doesn't 
> necessarily respond to being mixed with another fuel in the same way.
>
> That said, taking a straight arithmetic ratio (i.e. average them if you 
> are mixing 50:50) is close enough for anything but true laboratory 
> testing.  You might be +/- 1 point or so depending on the specific 
> hydrocarbon compounds in each of the component fuels, but it's not a big 
> deal for street driving.  Easy enough, huh?
>
> Jim Burkhard
>
> JR wrote:
>> ----More and more stations are going to one hose per pump. Makes me feel 
>> like I'm getting a hose full of 87 before any 93 makes it to my tank. The 
>> NEXT guy gets lucky and gets a hose full of the 93 that "I" paid 
>> for!------
>