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Aviation Oil

A little bit of both actually. For example the Cessna 172 is a direct
drive, however the Cessna 175 is a geared prop. The Cessna 175 runs at
higher RPM than the Cessna 172.

It is interesting to note that aircraft engines run at 75-85% power for
2,000 or more hours before overhaul. I'd speculate the power
requirements for the average oilhead would be in the order of 15% or
less, and I wonder whether they would make it to 2,000 hours if they
were subjected to these loads.

Which leads me to believe Aviation Oils cannot be harmful to Oilheads,
basically because the Boxer engine was designed after an aviation
engine, and because pressures and temperatures in aircraft engines are
well beyond what the average motorcycle engine would ever experience. If
aviation oils are capable of absorption of more carbon, what adverse
effect could that possibly have on a motorcycle engine? What possible
difference can RPM have on the oil, when the duty and responsibility of
oil is to provide a layer of protection and lubrication between metal
surfaces, as well as provide cooling? Since aviation oils are generally
semi-synthetic and capable of sustaining higher temperatures while
maintaining viscosity, where could you possibly go wrong using them?

- - -----Original Message-----
From: owner-oilheads@xxxxxxxxx [mailto:owner-oilheads@xxxxxxxxx] On
Behalf Of Louis F. Pechon, Jr.
Sent: May 19, 2005 9:50 AM
To: oilheads@xxxxxxxxx
Subject: Re: Aviation Oil

I believe aircraft engines are geared.  The props turn slower than the

- - ----- Original Message -----
From: "Dancoe, John" <jdan@xxxxxxxx>
To: <oilheads@xxxxxxxxx>
Sent: Thursday, May 19, 2005 11:38 AM
Subject: Re: Aviation Oil

> >Speaking of oil burning - Does anyone have advice to offer as to
> >whether
> aviation grade oil should be used in oilheads?
> This is my understanding why:
> 1. General aviation aircraft have the prop bolted directly to the
> crankshaft
> (not geared)
> 2. Therefore, the motor must turn at the appropriate speed for a
> 3. This speed is on the order of 2500 RPM, not 7000+
> 4. As a consequence of low RPM running, GA engines are much more
> susceptible
> to carbon buildup
> 5. Aviation oil is formulated to prevent this carbon buildup
> 6. This formula compromises lubrication properties
> 7. That's why GA engines have to be overhauled much more often than
> vehicle engines
> John D

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