She runs!!!!!

https://youtu.be/yqRx-hH8xsk

https://youtu.be/PGN509s67oU

Is anybody running the slide throttle? I'm finding it hard to slide with engine running due to the suction. Now mind you, I don't have any mechanical advantage or throttle cable setup yet. I'm using a threaded bolt to test with.  Can someone share their setup with the slide throttle / lever quadrant used?

With the engine on the test bench, what safe rpm would be good without any load on the crank? I'm aiming between 2000-3000 right now. Not sure if it matters without a load on engine?

- Matt Boiteau

You will have to put a 2 to 1 lever on it.  That will reduce the force by half.
The travel will be 4 inches at the top of lever. The lever can be six inches long.

With the 5 square inch area throttle nearly closed and 15 psi (atmospheric pressure
at sea level ) across it the force is 76 pounds.
Assuming you did the Teflon liner properly  and used the right kind of Teflon
the coef. of friction for  Teflon is below 0.1 so that is 7.6 pounds of force
on the cable.

As you open the throttle the pressure drop across the throttle becomes
less and that number will drop.

Historically slide throttles have used linear ball bearings but they are very
expensive and subject to jamming with just a little bit of dirt. They usually cost
over a thousand dollars US. The Teflon liner will tolerate dirt and embed
it in the soft Teflon. Many small slide carbs have the slide coated with Teflon.
The SU is a well known example.

The e-shaft is absolutely  the last thing you need to worry about since
we are using a stock e shaft and we are getting 650 HP. The part of the
e-shaft next to the flywheel is the most highly stressed part and that
has held up with over a 1000 HP on a turbo 4 rotor. Stock e-shaft and
stock diameter. The stock e-shaft is atomic bomb proof :-) After all It was
built in Hiroshima. Sorry! politically incorrect joke.

IT MATTERS!
BE VERY VERY CAREFUL. The engine will run up to very HIGH RPM's with no load
and then seize. I don't know how high WITH oil pressure but WITH OUT oil pressure
it seizes around 10,000 RPM very roughly speaking. It has been done so don't try it again :-)

Of course there is a rev limiter in the stock RX8.

Paul Lamar

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