[VB] redux: Porsche Pulley

[claralw at aol.com]

The Porsche pulley is smaller, which mean the fan runs faster and blows more air.

At hot weather this could be good.   But not when it is cold.
don't get rid of the stock pulley and belt.  
 When the weather cools down in the fall you will want to change back, or the engine can be damaged by running too cold.


-----Original Message-----
From: Lee <l.s.griffiths at salford.ac.uk>
To: vintagebus <vintagebus at type2.com>; c.dreike <c.dreike at verizon.net>
Sent: Mon, Jul 22, 2013 1:04 am
Subject: Re: [VB] redux: Porsche Pulley


So you are saying that with the fan running a little slower ? the engine 
ran cooler ?

Is this a fan load/resistance issue ?

Lee

On 22/07/2013 05:22, C. Dreike wrote:
> Hi,
> Ran an experiment on my upright engine. Last weekend I motored down
> and back up the freeway at WOT using the stock pulley on my
> alternator. Today I ran once again however with a Porsche pulley.
> Slightly smaller diameter, have not yet made an estimation of how much
> smaller. Ambient air temperature was about 70F on both runs. With
> stock pulley I saw CHT at about 365F and still slightly rising. Today
> with the Porsche pulley I saw a max of about 345F. I hit 75mph before
> I let up on the throttle.  I think I'll keep the Porsche unit in
> place.
>
> BTW, the stock belt is 905mm. I went to a 890 for the PP.
>
> Cheers!
> Chris
> 64 DD Kamper Kit
>
> Scientists seek to understand what is,
> while engineers seek to create what never was.
> As the "Bad Astronomer" Phil Plait says, "Teach a man to reason, and
> he can think for a lifetime."
>
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