Paul Wrote:

Do you have any distributors in the US?

Can you make me a set of 2 mm one piece apex seals for a 87 13B?
I have decided to go with a normally aspirated 13B.
What end clearance should I set them up with?

I am looking for durability, simplicity and reliability.
I have seen a few problems with the "Swiss watch like parts"
used in the stock Mazda sealing system. In an aircraft we
don't care about any RPM below 4500 as long as it starts.

I have heard that one piece seals can wear in such a fashion that
a hook is formed on the end that catches the corner seal and prevents
it from moving in and out. Have you experienced that problem?
If so would a small chamfer on the back corner of the apex seal
help? I intend using the much stronger corner seal springs from
the 93 and up engines.

On another matter, for those of my 1000 news letter subscribers that are
going
with turbo charging. Have your apex seals survived detonation?
If so will the 2 mm survive or does it take the 3.0 mm or 3.5 mm
to survive? Would you mind telling me what kind of steel they are
made from? You might as well tell me as I can get tham analyzed. :-)
I am not going into competition with you making seals. :-)

How is the direct lubrication working? Any feedback from the field?

We have one fellow in Florida, Tracy Crook, that has 900 hours on a Mazda
13B in an aircraft (average continuous HP about 150) with very little
wear on the stock seals by using two cycle oil mixed with the fuel
and disabling the EGR. Tracy projects the life of the engine at
around 3000 hours. Others have about the same number of hours
at similar HP levels using the engines in gyrocoptors.

I get over to England now and then so may visit some time in the
future. Last year I visited Juergen Bax at Wankel in Korb and got
to drive his prestine NSU RO-80.

Paul Lamar

Eamon Hurley wrote:

Hi again Paul,
No we don't have an US distributor but a great many of the rotary rebuild
shops use our stuff.

I would recommend our 3m/m Racing seal for your application with the duplex
springs.( no Swiss watch like parts ) Ha Ha.

 The wear problem you are referring to is, I think, the one when you have a
little raised portion on the very end the radius which makes a grove in the
rotor housing. It is not only on one peice but all Mazda hardened Apex
seals, No we don't have that problem with our seals

As I said our seals are now fitted by many Rotary shops, many are fitted to
racing turbo charged engines, some as high as 900+ BHP with 35+ Boost etc
etc.

The material is a cast-iron alloy.

Yes the direct lube system is working well , I would have thought that this
system, regardless of what tip seal you were using was ideally suited to
your application. It would of course extend the tip seal life greatly.
Yes come and visit next time you are in England.
Best regards,
Eamon Hurley.

http://www.hurley-engineering.ltd.uk/
 
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