A groovy solution for vintage piston issues. (Upd. 1923 &1925 US Patent)

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When you know about overhauling and rebuilding vintage engines, you also know about the issues that may arise at piston level. No matter how accurate and meticulous you work, (partial) piston overheating and even piston seizure can always happen. There are various ways to prevent these type of issue. Today we like to present a Belgian-Dutch patent (around 1940) that made use of superficial diagonal grooving, resulting in much better lubricating and cooling of the piston. The piston grooves will retain small amounts of oil. Due to the high speed piston movements the oil will meet at the groove crossings and produce miniscule lubrication 'explosions' all around the piston.  Specialist Charles Qua who not only has the knowledge but also the specialised tooling told us that in modern pistons a less smooth surface is coming in vogue for similar reasons. Also in racing and certain Ferrari pistons grooving is in use. Learn more about this technique at this groovy website.

Update by Henk Schuring who found this 1923 (Robert Alford) and 1925 (John Dinnes) US patents regarding diagonal piston grooves. Maybe not exactly the same as what we see here, but very close!

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