Here's an e-mail I received from Wayne Linfield on June 1, 2013:
-------------------------------------------------------------
At Christmas I received a 4 in 1 engine kit with the Graphite & Bearings kit. I am now getting around to building the engine. I find that the graphite piston is too small. The data sheet specifies the diameter as 1.045" but the part I received is only 0.997".Having already bored the cylinder out to 1.000" it is too small to fit properly.Is it possible to send me one the correct diameter?
-------------------------------------------------------------
And my reply:
-------------------------------------------------------------
Wayne,
Hmmm - never noticed that before. That must be a typo, because the data sheet for the "Duplex" engine kit shows 1.000", which is the same stock. I'll have to fix that on the 4-in-1 kit packing slip.
Looking at page 10, it shows the cyl diameter is 1.000".
We do not offer graphite larger than 1".
Although I am not a machinist, I would think it would be wise/prudent to make your parts around any pre-manufactured parts.
Sometimes, bearings are slightly smaller by a thousandth or two from what the plans anticipate. Once or twice a customer has also complained about that. Of course, I have no control over manufacturers to make bearings the exact size as the plans specify. You must allow for generally accepted mass-production size tolerances. Not unlike 2x4 lumber is actually 1.5" x 3.5"?
Since your cyl is now oversize, I suppose you could insert a stainless steel sleeve like Dad did on his. Then you won't have to make another cyl.
Sorry about that!
