6 different .020 cylinder types

Doubt it. I think the porting is the same.

Nice!
I'm still hunting for one with the slotted screen. Just got one with the mesh screen on eBay about a month ago.

The slotted ones I think are harder to come by. Not sure what the production numbers were on these since only being made for less than a year for each type.

Little beauties! I always wondered if the screens restrict these little engines. If there is, I would think that the mesh screen is more free flowing.

My guess is the screen plugged up eventually. Also manufacturing process added time and costs hence was discontinued in favor of the twin slit cylinder for the .049 at least.

No mufflered Pee Wee?

WingingIt74 wrote:No mufflered Pee Wee?

I have a mufflered Pee Wee but it doesn't use a different cylinder.

I have several TD020 engines some with grooved type cylinder, some with thick wall cylinder. I assume these latter are younger than the grooved type. The grooved types also do not have their top fin milled to acommodate the wrench, while the thick wall cylinders have their top fin milled..

Question: were the older, grooved type TD 020 cylinders made with tapered bore?

Because my TD051-s with grooved cylinder do have tapered bore, but the younger TD051-s with thick wall cylinder do not, I assume the same goes with TD020-s too,i.e. grooved cylinders were made with tapered bore.. I read once that COX abandoned the tapered bore design to cut production cost, at least on the TD049 and 051 engines. Does it imply that once the TD 020-s with grooved type cylinders were also made with tapered bore?

My experience with tapered bore is very positive as far as the longevity of engine compression is concerned.