[Spridgets] How it's made. Episode 498 Judson Rotor.

Dean Hedin dlh2001 at comcast.net
Fri Dec 21 13:22:40 MST 2012

I haven't noticed any wear issues with the bore of my unit.  

I had honed it out some time ago and once it had broken in, the bore took 

on a polish and has remained this way ever since.


I believe the orginal vane material has much to do with how the bore wears.


But I am intrigued by the low friction aspect of the coating. 

How much does it cost to coat the bore in the ZN54?


From: kramer.allen at comcast.net [mailto:kramer.allen at comcast.net] 
Sent: Friday, December 21, 2012 12:02 PM
To: derf
Cc: Spridgets; Dean Hedin
Subject: Re: [Spridgets] How it's made. Episode 498 Judson Rotor.

It's been awhile since I have been on the list. However, I thought I would
update how my Judson SC has been running. The unit has approx. 3000 miles on
it and is still performing very well. I have been adding 1 oz of Miracle to
1 gal of gas. Not having any overheating issues.

The unit has Torlon 4435 blades The housing bore treated with ECAT's thin
film wear resistant coating ZN54. The specs on the coating are 3000
microhardness, .06 coefficient of friction, 2-5 microns coating thickness,
1560 F max. working temperature. 

One of these days I plan to tear it down to see how the inside is wearing. I
think a good point would be 5000 miles.


Merry Christmas



From: "derf" <derf247 at gmail.com>
To: "Dean Hedin" <dlh2001 at comcast.net>
Cc: "Spridgets" <spridgets at autox.team.net>
Sent: Wednesday, December 19, 2012 11:47:41 PM
Subject: Re: [Spridgets] How it's made. Episode 498 Judson Rotor.

When I had my Judson I contemplated coating the inside surface with Teflon
or Ceramic or something to help with friction.
Never got around to doing it, though.

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