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Outstanding!! B)

Thanks, Terry Actually, I have a small Dotco 100,000 RPM air powered die grinder that I mounted on the compound. A 1/8" diamond burr did the cutting. Kind of a jury-rigged set up but it got the job done. Now that I have the method down, it should be easy to do again.

Well, that went quite well. A carbide boring bar probably would have been easier but the grinding apparatus was at hand and was very easily controlled. The throat was enlarged from .217" to .261". Thanks for the help!

First, thanks for the input, guys. This is just what I needed. My mill is a horizontal so it's not much help. I have the rotor set up in the lathe and indicated in and was going to try to grind it with a grinder set up on the cross feed. Does anyone make a boring bar that will go into a...

So grinding is the only option? Thanks for the input.

Thanks, Phil. Yeah, a file will barely touch it. I guess I'll try the annealing route. Ken

I'd like to open up the bore on an O.S. rotary carb a little. I have various reamers but I was wondering how hard these things usually are? Do they need to be annealed before reaming and then re-hardened? Thanks, Ken

Another possibility is to get an SG-style crank for the Picco which will accept the Zippkits flywheel. I'm not a car/truck/buggy guy but I believe they made a version of this motor with that style crank.

That's a mean lookin' machine, Marty. Have a great time running it this year. You have some stiff competition up there in the northwest.

On another page they have a chart of recommended torques: Torque Chart

PM sent.

I put in a WTB for a 10-series rotary carb in early March and got no responses. I did a workaround so I don't really need one now but I will offer $18.00 shipped. Do you take PayPal? Thanks, Ken

O.S. 12TR, O.S. 12CV, O.S. 15CV and probably others.

Tucson Model Boat Club charges $5.00/boat for members, $10.00/boat for non-members for club races once a month. NAMBA D19 races are $10.00/boat for adults or $5.00/boat for juniors. Non-NAMBA members must also pay a $10.00 single event membership fee.

Congratulations, Jim. You deserved it. That's a cool boat and a cool trophy, too. You're the first one I've seen to run the turn fin that far forward. Edit: That should go on the Zipp website!

They now have the 1/4" gas-size strut up on the web site: Gas Strut

Carbon graphite rods of all shapes and sizes are used as the electrodes in EDM (electrostatic discharge machining). It's a consumable but I don't know the cost. You might try looking in that direction.

Here's a quote from Charles Perdue on the subject of drive line friction but couldn't the same method be used to measure drive line wind up for the purpose of indexing the prop to the piston stroke at maximum horsepower? Thanks, Ken [Enjoying the heck out of this discussion]

The grammar alone makes this one an "untouchable".

This is a rotary carb and fits the .12CV-R and the .15CV-R and maybe some others. Actually I'm looking for any rotary carb with a neck that will fit in these engines (.393" / 10mm or thereabouts). I could do some modification, but there's not a lot of room to play with. Thanks, Ken