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1927 Chummy #3 Speedometer over-reads

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1927 Chummy #3 Speedometer over-reads
Nick Salmon Offline
Older, but none the wiser...
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Joined: Aug 2017 Posts: 1,257 Threads: 219
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Location: North Herts
#1
01-10-2019, 03:48 PM
The Chummy's speedo is accurate to about 20mph (though the needle oscillates very fast, presumably because of the type of drive belt on the pulleys) and then dramatically over-reads so that by the time the car is doing 35mph the needle is off the scale at 60+mph. Pictures show speedo unit and the drive arrangement off the propshaft. Is this 'normal' or is there a job of work to be done in finding different sizes of pulley on order to get an approximation of true speed?

.jpg   speedo.jpg (Size: 74.84 KB / Downloads: 371)

.jpg   drive.jpg (Size: 98.2 KB / Downloads: 370)
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1927 Chummy #3 Speedometer over-reads - by Nick Salmon - 01-10-2019, 03:48 PM

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