Date:         Wed, 3 Jul 2002 15:08:12 EDT
Reply-To:     FrankGRUN@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Frank Grunthaner <FrankGRUN@AOL.COM>
Subject:      Re: AT speeds/rpm's
Comments: To: afox@CNR.COLOSTATE.EDU
Content-Type: text/plain; charset="US-ASCII"

In a message dated 7/3/02 9:34:36 AM, afox@CNR.COLOSTATE.EDU writes:

<< Good story ben.
I agree that it is not good for any automobile engines to run over 3500
rpm for prolonged periods.  I try to keep mine under 3900.  Unfortunately
it would be dangerous for me to drive my van under 3500 rpm on the local
freeway. >>

Sorry,

This is simply not true. Modern engines are designed for specific operating
ranges. Sub 2.0 L engines continuously operated at their maximum torque rpms
for extended periods of time will suffer higher wear and higher probability
for short term catastrophic failure than one operated at maximum power
levels. The VW inline 4 engine in its 1.8 to 2.0L incarnations is designed
for 5000 plus rpm operation and routinely delivers a service life in excess
of 250,000 km in that mode. This has been discussed extensively in the
archives, and I have offered a number of references in the technical
literature for further information on the subject. Unfortunately many of
these accepted forms of wisdom are dead wrong and common sense can be made
more valid by looking at the current state of automotive technology. This
statement was correct and in vogue in describing mainstream American and
British manufacture in the 50's , but no longer relevant.

Frank Grunthaner