Does anybody have a line on RX8 automatic flywheels and
counterweights?
Mazdatrix quotes $380. or so and Ithought that was a bit much. I have
one on a 13B and wonder if they are the same. Karibian
Bruce Turrentine put a 13B flex plate on my Renesis engine to fit
Tracy's redrive.
Scott Gettings
Scott/ Karibian,
The counter weights would be the most expensive parts - getting the
right
weight is the most important part. The flex-plate is balanced to
itself, I
don't believe the 13B counter weights are the same as the RX8 counter
weights - although I have never weighed them, perhaps Tracy has!?
George ( down under)
I have an rx-8 flywheel.... no counterweights. It is different than
the flywheel required by tracy Crook for his PSRU.
Paul Kvernplassen
-----------------------------------------------
What you have is a flywheel Paul. What people need is a flex
plate with balance weight for an RX8. The only thing they have
in common is the ring gear and I am not sure about that.
Jim Mederer, how much money would it take for you to make
a batch of 25 sets of RX8 flex plates and counter weights?
The flex plate does not have to be identical. Just the ring
gear and flat surface near the ring gear must be in the
same longitudinal position. No clutch wear surface required.
It will be bolted to this device.
Could it be done for less than what Mazda charges for flex
plate and counter weight?
This appears to be a recurring problem for us as many
six port RX8 manual tx engines are being converted to use auto
tx flex plates and counter weights. The two parts could
also be combined in theory to cut the cost. Something
like the PS flywheel without the large gear.
Paul Lamar ...No rotor no motor.
Hi Paul,
Our cost for the RX8 rear counterweight, N3Z2-11-52X, Our part #
11458 is $109.70.
It would certainly be possible to machine a "drive disc" with a ring
gear mounted. In modest quantities, it might come out a bit cheaper
than $380.00 with the counterweight and ring gear, but with what bolt
circle? What disc stiffness is necessary?
Jim Mederer
Not much disc stiffness. No real loads on it other than
the starter and the torsional. Can get you get ring gears?
Seems like 3/16th mild steel would work. Perhaps you can find
some one to stamp press it out of 3/16th mild steel or even
normalized 4130. It needs that recessed center.
AC Spruce sells 18" by 18" .190 thick 4130 for
$90. If you buy 18" by 36" .190 4130 that will make three for $120
total or $40 material cost each and have a lot of 6 by 12 pieces
left over.
The stamp press tooling would be easy to machine on a large lathe. It does
not need all the holes the stock one has. Just the four 3/8th to
mount Tracy's torque isolator. The customer can drill those. Weight
is not an over riding concern. The stock counter weight is cheap
enough. The kit will sell for the next five or ten years.
Paul Lamar ...No rotor no motor.
Hi Paul
We stock the ring gear in quantity.
Now you can order the stamping tooling.
Jim Mederer
Having the ring gear is a good first step.
I don't follow you on the second sentence.
Do you mean you want me to provide the tooling?
I might. I know nothing about stamping. Do you have somebody
in mind that can stamp steel parts? If so I could talk to
them and find out what they need in the way of tooling.
This outfit claims up to 1/4 inch thick and can make
the tooling.
http://www.crowcorp.com/stamping_gallery.htm
Here is one in Anaheim. "Metal stamping to 400 tons."
Last picture. I think they can do it :)
http://www.aggressiveengineering.com/
(714) 995-8313 Fax: (714) 995-0251
Address 1235 N. Knollwood Circle
Anaheim, CA. 92801-1310
Paul Lamar ...No rotor no motor.
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