Re: [MV] Black plugs.....Premium Fuel

From: Buck & Rami Sharp (bls@inebraska.com)
Date: Wed Oct 02 2002 - 20:22:32 PDT


A-men good job john i tell people this all the time.
----- Original Message -----
From: "J. Forster" <jfor@quik.com>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, October 02, 2002 4:44 PM
Subject: Re: [MV] Black plugs.....Premium Fuel

> Horrocks, Aaron wrote:
>
> > The documents for my M38A1 say to use a gasoline with a minimum octane
of 60.
> > Wouldn't using premium with an octane of 91 be bad for my jeep in some
way?
> >
> > Aaron Horrocks
>
> The manual you quote says MINIMUM, not maximum.
>
> Octane rating is a measure used to characterize the pre-ignition rating of
> gasoline. If the rating is too low for the engine compression, the gas
will
> pre-ignite and cause knocking or worse. It is measured with a special,
variable
> compression, engine (without a spark plug) that is driven by an external
motor.
> The cylinder head is cranked down until the gas ignites by compression
ignition,
> like a diesel. The compression when ignition occurs is compared to pure
octane
> (which is a pure chemical, not a mixture of several chemicals) and that is
the
> octane rating.
>
> As long as the engine stays the same, a higher octane will not give you
more
> power. It's largely a waste of money.
>
> Flame away.
> -John
>
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