Re: Playing with puch

> Alan Jackson Wrote:

> -------------------------------------------------------

> on rd350's a cooling slot is sometimes cut into the piston about 10mm

> below the rings to allow flow and aid under crown cooling - coinciding

> with the boost


> anyone tried this?

This is the original OEM piston from my 1957 Simplex Automatic :

Although it's conjecture , it's thought that the slot was meant to help cool and also control skirt expansion . No information is available for confirmation from the manufacturer .

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