Generally plastic bearings do tend to wear the metal shafts more than
expected. May be related to the plastic "holds" impurities which tend to
provide a nice substrate for wearing the metal. This is a known
phenomena in industrial/commercial apps, and I have seen this issue. Not
sure about the throttle shaft/bearing as there is relatively low loading
on the bearing. The factory seals are more compliant.
Jon

On 9/13/2014 5:37 PM, Alistair Bell wrote:
> Really? You think in this application the throttle shaft will be worn away?
>
> Geez, I better tell the guy who bought the 600 buck HDPE shaft bearing for me to install in his sailboat rudder :)
>
> Don't mean to sound snarky, it's just e first I have heard of such a thing in such an application.
>
>
> Alistair
>
>
>
>> On Sep 13, 2014, at 1:31 PM, Jon VonOhlsen <jondvo@GMAIL.COM> wrote:
>>
>> One issue may be wear on the throttle shaft. HDPE, Delrin, and PFTE
>> actually can wear the metal out. I have seen this in industrial plastic
>> & metal applications.
>> Jon
>>
>>
>>> On 9/13/2014 1:54 PM, Neil N wrote:
>>> very helpful Alistair.
>>>
>>> I still may buy the gowesty vacuum operated TB switch for my '88 but
>>> knowing that HDPE likely works (untested?) is really helpful.
>>>
>>> Do you see HDPE wearing well over the long term? I'm sure I could
>>> google up some info too.
>>>
>>> Thanks.
>>>
>>> Neil.
>>>
>>> On 9/13/14, Alistair Bell <albell@shaw.ca> wrote:
>>>
>>>
>>>> http://shufti.wordpress.com/2014/09/13/vanagon-quick-throttle-body-re-bush/
>>>
>>> --
>>> Neil n
>>>
>>> Blog: tubaneil.blogspot.ca
>>>
>>> '88 Westy http://tinyurl.com/c8rlw6p
>>>
>>> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>>>
>>> Vanagon VAG *Gas* inline-VR Engine Swap Group:
>>>
>>> http://tinyurl.com/d7gd5ej