Documenting the restoration of a 1960 BMW 700 Sport Coupe done in our garage. A full nut and bolt rebuild from the ground up. The plan is to make a custom rally car drawing on inspiration from the 700 RS, the 700 rennsport and the Willi Martini prepped race cars.
Wednesday, July 25, 2012
Ringy Dingy
I have been putting together the piston, ring and pin kits. Then weighing each part individually in preparation for a full balancing of all reciprocating weight. During this process I began to admire the oiling rings that came with the vintage racing pistons we acquired. At first I considered using the oil rings from that set in leu of the ones from Total Seal. They sure looks the part. Its of a 1-piece design and beautifully machined. However it weighs 15 grams to the Total Seal 3-piece ring set's 8 grams. Plus after slipping it into the cylinder to check fit it appears like it would drag a lot more and rob valuable horsepower on top of being heavier. Its such an interesting piece I thought I'd share a pic or two even if I'm not using them. The 3rd set of oil rings is a 4-pice design and from the pistons I pulled from the motor. They weighed in at 10 grams.
Oh, and I almost forgot the piston pins. I had 2 sets of these as well. A set from the pistons that were already in it and the other are from the Mahle racing pistons. Only 1 of the four was a gram lighter. The other three were exactly 105 grams. Guess I won't have to do too much "balancing" after all...
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Could you post an update on the progress made?
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