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OIL THERMOSTATS FOR TRIUMPH/BSA TRIPLES

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12. DM THERMOSTAT TEST RESULTS

With the water in the test kettle cold (about 60F) and compressed air applied to the "from engine" connection air bubbles came through the "to cooler" connections only.

However with the finger restriction applied to largely but not completely blocking the "to cooler" connection a large number of bubbles came from the "to oil tank" connection but no bubbles from the "from cooler" connection.

The water heater was then switched on and the water heated.

With the same degree of finger restriction on the "to cooler" connection as the water temperature reached about 180F bubbles stopped coming from the "to oil tank" connection and the "from cooler" connection.

With the water at boiling point and the same finger restriction on the "to cooler" correction there were no bubbles from the "to oil lank" or "from cooler" connections.

As before the water in the test kettle was allowed to cool naturally and the test repeated at lower temperatures.

At 185F there were no bubbles from the "to oil tank" connection and just one or two bubbles from the "from cooler" connection.

At 170F there were lots of bubbles from the "to oil tank" connection.

At 160F and 150F the results were the same as at 170F.

These results show that the DM thermostat operates at about the 185F design point and on cooling down returns to the "cold" condition somewhere between 170F and 185F.

This is basically what one would expect.

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