Re: Port and Polish

["Michael & Carmen Keith" <mikeandcarmen@pdq.net>]

Can porting & polishing ever have a negative effect on low or midrange
torque?

Michael Keith
'98 Jetta GLX
'85 Golf SCCA ITB/DSP
-----Original Message-----
From: Robert Malinka <rmalinka@spec.net>
To: jettaglx@igtc.COM <jettaglx@igtc.COM>
Date: Wednesday, July 15, 1998 9:32 PM
Subject: Re: Port and Polish


>At 05:40 PM 7/12/98 -0700, you wrote:
>>This may sound stupid, but anything to get this cop topic to disappear..
>>
>>What is a Port and Polish? I mean what do they actually do, and how does
>>this affect performance? I am VERY curious.
>>
>>Patrick Sherman
>>mailto:patrick@volkswagen.org
>>1997 VENTO VR6 / Tornado Red / 18K
>>"One cannot live on air alone....Add Water"
>>
>>
>>
>
>Patrick,
>
>It is exactly what it sounds like and that is that air like most physics is
>subject to friction. (BTW I happen to be a sailor and race so this is very
>important if you are to understand laminar flow and the venturi effect for
>boat speed. In sailboat racing the difference of a quarter of a second
>faster boat speed can translate into a winning boat versus a noncontender.
>Winning times are measured in tenths of a second. That's why when we round
a
>mark we use a stop watch to time how long it takes your competitor to reach
>the mark. Repeating this procedure at the next mark can tell you if he's
>catching you or if you are opening up a bigger lead.  This then will
>determine the strategy utilized to keep in front of your competitor by
>"covering closely" or "loose cover" or just ignore him and sail your own
>race.)  What you want is a smooth as possible surface and you want to open
>it up to improve the dynamic efficiency of the opening.  By doing this you
>increase the volumetric efficiency thereby bringing in more air faster
>exponentially. Opening the intake even a small percentage using smooth
>surfaces can have a dramatic effect on increasing volume which translates
to
>more horsepower. The same principles are used by aircraft designers to
>design wings, flaps, engine enclosures as well as the jet engines
themselves
>(turbine blades, etc.).  A little long winded explanation but hope this
>helps. If you need more info drop me an E-mail.
>
>
>Bob
>
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