------------------------- *From:* paul lamar
<
rotaryeng@earthlink.net *To:* A10-Me-Earthlink
<
rotaryeng@earthlink.net *Sent:* Monday, 5 September 2016, 23:58
*Subject:* The correct flywheel for RX8
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.
-----------------------------------------------------------------------------------------
Here are a couple more 3D's.
Paul Lamar
Along with the counter weight that's what I need next
Cheers
Mark Dillner
Hurley should be able to help you there.
Paul Lamar
Paul, did I read way back that an RX7 flexplate could be used on the
RX8 and if so could the counter balance of the RX7 be used also?
Mark Dillner
The flex plate is probably OK. There is new casting technology in the
RX8 rotors so they are probably lighter therefore an RX7 counter
weight may not be balanced. You might have to have the engine
rebalanced by Hurley Engineering.
I'll send this to Dave Lemon at Mazdatrix. He will know.
Mark is in the UK Dave.
Paul Lamar
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