Cox .020 Pee Wee/Tee Dee question.

roddie Sat Dec 09, 2017 2:36 pm

Were there any differences in "cylinder-porting" between these two engines? The Tee Dee .049 for example; has additional "boost-flutes" in its cylinder-porting.

Is there such a thing as a "Tee Dee .020 cylinder".. or were all Cox .020 cylinders designed with the same porting? Did Cox ever apply sub-port induction to an .020 cylinder? It would seem that a Tee Dee .020 would offer more than rotary-valve induction, to classify it as a "Tee Dee" series-engine. The Cox "Medallion" series engines didn't offer much more over a reed-valve engine of same displacement, other than having rotary-valve induction. Maybe it was a Cox "marketing-decision".. not to classify the Tee Dee .020 as a "Medallion" .020?

any info/thoughts appreciated.. Smile

Jason_WI Sat Dec 09, 2017 2:56 pm

Cylinders are all the same for the .020. The only difference is thin walled, stepped wall, thick walled, mesh, and slotted screen. Nothing affected the ports on these variants.

Early .020 TD pistons were tapered. This was phased out in '72.

roddie Sat Dec 09, 2017 3:33 pm

Jason_WI wrote:Cylinders are all the same for the .020. The only difference is thin walled, stepped wall, thick walled, mesh, and slotted screen. Nothing affected the ports on these variants.

Early .020 TD pistons were tapered. This was phased out in '72.

Thank You Jason! Thumbs Up

Surfer_kris Sat Dec 09, 2017 3:37 pm

roddie wrote:Did Cox ever apply sub-port induction to an .020 cylinder?

They all have SPI, as far as I know.

The amount of SPI can vary quite a lot though, from one engine to another, but that mainly comes from the length on the conrod. It seems that the manufacturing of the conrod ball-joint to the piston might be the problem, difficult to manufacture accurately I guess. I wrote a thread on that topic some time ago on this forum.

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Cox .020 Pee Wee/Tee Dee question.

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