Custom Pee Wee .020

beautiful!

Oh Yeah!!!! Now, settle yourself in for the winter and make one of these for each of us !!!!!

Good job Jason, very well thought out.

Is this a future entry for the upcoming reedie tach race? I think there is a pee wee class this time. I could be wrong.

Ron

It runs! I didn't get a video as it is raining and cold but I have a crappy pic to prove it. The concept works. Every time I would touch the needle valve the RPM would vary so I know I am getting air leaks. I definately need to make the aluminum venturi tube to correct that. The RPM at one point was 17.8k but I touched the needle and it dropped. I may have a source for the 11/64-40 tap from a sewing machine repair shop out east. He is to get back to me on Monday with a price.

I always like Cox conversions and this one is no exception.

I have today been examining the TD venturi and the carb body. I have no doubt that the carb body is to all intents and purposes an 8 40 equivalent.

The venturi, however, is not just a tight fit - it gets progressively tighter. I tapped an 8 40 thread in a piece of brass and the venturi was a no go. I then re-examined the venturi thread and measured it.

The one I have was new and unused from the original Cox packet. My measurements would indicate that the thread - although 40 tpi - is tapered. Not much but tapered.

At the bottom of the thread I started out with a reading of .16625 and on working up - .16645, .16685, .16710, .16715, .16735. I have only the one new venturi but repeated the measurements several times with very similar results.

I would think that an 11/64 (.171875) tap will result in a loose fit.

I would be tempted (if intending to keep the venturi for your new creation) to run the venturi through a die and bring the thread down to 8 40. Most dies can be adjusted to cut a slightly larger or smaller thread for testing before commitment.

The 11/64 x 40 tap worked perfect. I was able to turn the venturi adapter and thread it today. I JB welded the adapter onto the reed holder. I will let the JB weld cure before I run it. Besides its 7F outside today.

That looks great! I can't wait to see a video of it going!

indeed.... way Kool

mine is in the mail rite?? (nodds lots)

Admin wrote:That looks great! I can't wait to see a video of it going!

I like it I like it, but mine will be a little different lol

With that big venturi I bet it will out perform a standard Pee Wee. And you can pressurize the fuel if you so desire with the KK NVA.

yyou forgot to add the carb and throttle ring combo

Ran this engine today. I have a band aid on my finger from this little !&@$. Seems to peak at 17.4k. Fuel tank height is critical with this engine and would benefit from crankcase pressure. A throttle ring would be nice or a carb on the rear.