Hello Paul, Can you tell me which flywheel is the correct one to fit
 to a RX8 engine. I have removed the manual flywheel. Do I need a
 balance section from the automatic engine as well as the flywheel.
 Your help is appreciated . Regards

 Mark Dillar

 You need an RX8 automatic transmission flex plate and counter
 weight. Don't use Tracy's flex coupling. It over stresses the flex
 plate and may cause it to crack. Of course you can buy an after
 market expensive chrome molly steel flex plate/flywheel. That is
 what Dave Leonard did.

 Or use one of our couplings like the one used on the TTC engine.

 I have some water jet cut parts left  for the steel version. Weld it
 your self.

 Paul Lamar

 Thank you Paul, It's early days for me working on the Mazda so I
 shall start the search for the flex plate and counter weight. I shall
 hold on the coupling but will go back through the emails to see the
 pictures of the ttc coupler Thank you for the information that I do
 get from your News Letter and I hope you don't mind if I should
 forward further questions to you

 Mark Dillar

 I sent pictures of the TTC coupling. Did you see the aluminum
 version? That was the TTC coupling. If you are using a cell phone
 they sometimes are limited to the number of pictures they will
 download.

 The TTC coupling could be half the length for an ordinary two rotor.
 The diameter would be the same as it picks up the six high strength
 bolts in the counter weight.

 The stock E-shaft and counter weight are way over designed for a 250
 HP normally aspirated p-port 2 rotor. I suspect 1500 HP would be no
 problem. The three and four rotor turbo's are using the same parts.

 Here are some more pictures of the TTC coupling. The flex plate shown
 is an after market aluminum version.

 Paul Lamar



 Got them thanks Paul. Both the plate and the coupling are really
 nice. Looking back , a coupling like your steel coupling would be
 ideal for my requirements Is the rubber available easily?

 Mark Dillar


 It is in the states from McMaster Carr.

 I can mail you a block to the UK if necessary. It is easily cut with
 a band saw or hack saw. It can also be drilled to soften it.

 Here is a scr capture from McMaster.



 Paul Lamar


 How much would I be looking at, in round figures, for you to send me
 the water jet cut parts and the silicone Paul?

Mark Dillar

I am not sure about the postage.
The parts and the silicon would be $50 US cash in the mail.
I have enough silicon left over from the TTC project so no Macmaster
Carr $50.
I'll get back to you on the postage cost.

I redesigned it in metric so you can get the rest of the parts in the UK.
The Formula 1 constructors must have a bunch of metal suppliers that
they use.

Do you know my rotary engine  friend Eamon Hurley in Coventry. Is he he
still alive?

He stepped off his rotary powered bike at 175 MPH and lived to tell
about it years ago  :-)
He can help you a lot.

What are you going to use for a gear box?

Do you have 3D drawing software?


Paul Lamar


Hello Paul,
That sounds like the best option to get me forward on the coupler. If you let me know on postage and how it is best to pay. Do you use Pay Pal ?
I read where you recommended your friend Eamon Hurley sometime ago and I jotted down his details (Arbury Avenue etc) . He is pretty much due east of me when I am at home. I didn't want to impose on him until I had a particular problem that I couldn't overcome otherwise.

Strange that he should want to abandon his bike when at full chat. I would have thought he would have been enjoying it to much to call it quits.
I stepped off a train once as a young lad when it failed to make a full stop at the station I wished to depart at ( a station in Sydney) and I made a rather heavy and ungraceful landing. Fortunately only the conductor and I witnessed it as it was in the small hours of the morning. My landing was softened by a copious quantity of Aussies best nectar so nothing really hurt until the next day and I was able to give the conductor a good piece of my mind about stopping his train where I wanted it stopped or something to that slurred effect.
Anyway I hope your friend has healed well from his moment of embarrassment .

No I don't have any 3d drawing capability. Computers and electronics I have never grasped with both hands. I've got a good, well sharpened pencil. My imagination also seems to work well in 3d.

Haven't got as far as the psru yet. I do have some about but most are for lower power requirements. I have the psru from a Thielert diesel  as used by Diamond aircraft and fitted to some Cessna 172's but it is 1.7 :1 if I recall correctly . I am keeping it in mind as it could run a constant speed prop and I did pick up a MT composite two blade that may or may not be of any use. Perhaps the ratio of that psru is not enough to take advantage of ultimate Mazda hp but I only need in the region of 130hp initially. Like everyone else weight is a big concern and I don't know if I can keep the weight down enough for this project.

Mark Dillner

The bike went into handle bar extreme shake mode :-)

Forget 1.7 for a rotary. It needs to be at least 3.1. The Thielert box is heavy and designed
for an inline piston engine. It also fails when powered by a diesel :-)

The rotary is so powerful you don't need a constant speed prop. Just set the pitch
for best cruise. A ground adjustable is great.

Go to any auto tx repair shop in the UK and ask to see any used parts from a rear drive small
truck or large car. You are looking for a rear planet carrier  with the  sun gear and ring gear.
The sun gear diameter should be half the ring gear diameter or there about. The cost should
be less than about $200 US or the equivalent in pounds. If the parts are in bad shape
you can always oder new ones from the tx shop.

Take some pictures with your cell phone and send me the model number and car or
truck name it came out of.  I'll get back to you with a design. Hurley engineering can help you
if you say it is for a rotary powered boat or airplane. They have all the machine tools
needed. Then they sell it to others in the UK. Or you can buy one from Neil in Oz.

I don't do pay pal but if you go to Lamarinstruments.com you can make a contribution to
the TTC project with a credit card.

Paul Lamar

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