Date:         Fri, 17 Dec 1999 08:31:55 -0600
Reply-To:     Marshall Ruskin <mruskin@PANGEA.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Marshall Ruskin <mruskin@PANGEA.CA>
Subject:      Re: It's not about scoops, really (long)
Comments: To: Bulley <gmbulley@BULLEY-HEWLETT.COM>
Content-Type: text/plain; charset="iso-8859-1"

There are definitely precidents for the provision of additional cooling
fans - and not for the obvious reasons.

I am reading the Bentley on Bosch Fuel Injection (excellent book!), and I
believe it mentions several European cars have fans that are designed to
come on AFTER the engine is stopped - to protect the fuel injectors. The
book is in the van - and I cannot off hand remember which cars are
mentioned.

According to this book - exposing fuel injectors to extended periods (45
min) of heat-soaking is very bad for them - causes them to clog up.

When you shut off the engine - the temp in the injectors rises, because the
cooling effect of flowing fuel is elliminated - and the engine heat is still
radiating.

This is called "heat-soaking" - and fans will help reduce it's effect.

Marshall Ruskin


<snip>
>
>Also, has anyone (with a 1980-1983.5) experimented with using the heater
>fan output (from the fan on the alternator shaft) to force additional
>cooling air down onto #1 & #3 cylinders during the summer? Seems like a
>no-brainer to add a 5 cm tin duct fitting to the back edge of the tin
>behind #1 and #3, and run the unused output from the heater fan to cool
>these hot cylinders in the summer. In the winter, you just swap out the
>ducting, and cap off the fittings.
>
>Thoughts?
>
>G. Matthew Bulley
>Bulley-Hewlett
>Corporate Communications Counselors
>www.bulley-hewlett.com
>Cary, NC USA
>888.468.4880 tollfree
>
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