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erische Motoren Worke, München) the others had been built in license at the Opel Motorworke (Büsselsheim). Apart from the construction of the connecting rods, the camshaft, valve timing, and some minor details the construction of both engines is identical. The workmanship and finish of the original B. M. W., however, is far better than that of the Opel-B. M. W. Some of the difficulties which were experiences with these motors appeared only with the Opel-B. M. W. and not with the original B. M. W., while other difficulties of which both types suffered generally appeared earlier in the Opel-B. M. W. than in the original B. M. W. The original B. M. W. motor is superior in every respect to the Opel-license-B. M. W. motor.

SERVICE RESULTS. The exceedingly high compression ratio of those motors occasioned some trouble in the first service period during which ordinary petrol (gasoline) was used. Although the high compression ratio (6.55:1) does not give rise to its normally equivalent end pressure, as the high altitude carburetor does not permit full admission at low altitudes and the gas is thus throttled to a large extent at low altitude full power runs, it was found

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