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

From: Cliff Smith (mtnbikinssgt@hotmail.com)
Date: Sat Oct 05 2002 - 07:55:23 PDT

John;

True about the waste of money.  BUT, .....if and engine runs cleaner (='s longer) with less emissions (='s longer valve life) and is making more power (theoreticlly) then why not use the 'better' fuel.  I have heard that an engine (each one is different, even the same engines run differently) will run on a specific fuel.  I have not tried this yet on the Mutt but have on my other vehicles.  the higher octane (and yes my wallet hates it) does run better.  no sputtering, better fuel economy, longer in-between oil changes (that is my fault), good cold startups just to name a few.  Almost all of my driving is above 40mph, usually 55mph, and I have had no problems with using the highest octane fuel I can get, minus the Aviation fuel down the road.  though I used to use Aviation fuel 106/109 in a motorcycle a while back.  What a difference there!                 Flame on!

Cliff Smith
'70 Tan USMC M151A2
>From: "J. Forster"
>To: (Military Vehicles Mailing List)
>Subject: Re: [MV] Black plugs.....Premium Fuel
>Date: Wed, 02 Oct 2002 17:44:11 -0400
>
>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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