<VV> viton pump cups/crank seals

[corvairs at pacifier.com]

JR - His observations at the least are rational. I have NOT heard any
advice against using Viton for pump cups but I was warned by head
engineers at Parker several years back to stay away from Viton in
"dynamic" (rotating) seals. Whether some of the same problems could come
up with pump cups so far no one has given an educated opinion.

Lon Wall
www.corvairunderground.com



> Lots, but you are now mentioning the main reason for my concerns.  Has
> there
> been any adverse reports regarding wear when using the viton crank seals?
> Anyone?  They've been around for a while now, so I'm wondering if any
> problems have been noted.
>
> Later, JR
>
>
> ----- Original Message -----
> From: "Joel McGregor" <joelsplace at earthling.net>
> To: <virtualvairs at corvair.org>
> Sent: Thursday, September 01, 2011 7:06 PM
> Subject: Re: <VV> [fastvair] Re: viton pump cups
>
>
>> It seems to me that a crank seal does a lot more moving than anything in
>> a
>> carb.  How many inches per hour would 3500RPM convert to on the crank
>> hub
>> circumference?
>> Joel McGregor
>> ________________________________
>>
>>> Hi Dan,
>>>
>>> But, it also seems that the typical use of viton is in more or less
>>> stationary settings like seals, gasket, hose, etc.
>>>
>>> Accelerator pump cups are in a moving setting and in contact with the
>>> metal
>>> of the carb - sort of a 'moving seal' if you will. Are there any
>>> studies
>>> that you might be aware of which would indicate adverse (or
>>> non-adverse)
>>> effects on the accelerator pump 'barrel' or to the viton itself in that
>>> specific (or a similar) setting?
>>>
>>> Later, JR
>>
>
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