Author Topic: Sachs Dolmar 166 big bore  (Read 467 times)

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Offline srcarr52

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Re: Sachs Dolmar 166 big bore
« Reply #50 on: November 11, 2014, 04:18:06 pm »
These are model airplane engines. Some planes are as big as a pickup truck.

The people like to see the rings have a good vertical wear pattern within an hour's running time. The cast rings do this well.

The hard rings, you can run them a whole season and they will only show a vertical pattern half way - usually from the top. The pilots feel they are loosing compression.

Typically by the time the hard ring is fully seated, it's time for a new piston/pin bearing, crank/rod, bearings/seals

Vertically gas port the piston.  It will help those low tension rings seal better, been doing it on alky karts for a long time to control blow by.

 

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