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Subject: Re: [FlyRotary] Re: For Lynn....Freshening 13B Side Housings
Date: Fri, 08 Jun 2007 10:23:33 -0400
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Lynn,
All the listings I've seen for Nitride have showed a much thinner=20
thickness. The thickness I've had quoted is .0005 to .0015 total. If=20
you change the surface at all you are going to go through the coating.=20
You can run uncoated as you mentioned so this isn't a REQUIRED coating.
Bill Jepson


-----Original Message-----
From: Lehanover@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 7 Jun 2007 4:08 pm
Subject: [FlyRotary] Re: For Lynn....Freshening 13B Side Housings


In a message dated 6/7/2007 5:59:09 P.M. Eastern Daylight Time,=20
lendich@optusnet.com.au writes:


Lynn,

Having looked at that wear area on the end housings, I was wondering if=20
this was in excess, could we have the surface ground and then=20
re-Nitrided?

The whole process wouldn't be anywhere near as expensive as new housings

George (down under)


Nitride is between .003" and .007" thick or, more accurately, deep. So=20
you could surface grind until the wear mark is within the .006" and=20
then DA the surface to kill off the grinder marks and supply an oil=20
holding=A0 surface, or, grind=A0until the wear mark is gone and then DA for=20
a nice finish. The engine don't seem to care about it until wear=20
exceeds .006".

=A0

For all out racing and to save some very expensive ported irons, Paul=20
yaw grinds first and then laps to get his finish. Both acceptable. His=20
is better but pricey.

=A0

In olden times, the irons were not Nitrided=A0and ran along just fine.=20
After about 100,000 miles, hard starting from low compression would set=20
in from iron surface wear and apex seal wear. The chrome would also=20
wear out about then even with soft carbon seals and the engine would be=20
just about junk. I would grind the irons up to three times, and finish=20
with a DA. I had to shim up the front stationary gear and cut a chamfer=20
in the front end of the rear stationary gear bearing. As the engine=20
gets shorter, the crank moves to the rear and the radius on the rear=20
throw would run into the main bearing. I had no money and was always=20
racing junk engines. =A0

=A0

Re-Nitride if you have to go over .006 to get a finish.=A0

=A0

Here are some measurements from Mazda but nothing on the irons.

=A0

Lynn E. Hanover


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