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Optical Tachometer:Different Pulley Diameters-QUES
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Posted by Andrew H on June 18, 2005 at 16:57:12 from (66.131.254.174):
I have a Ford 550 TLB. Proofmeter cable is busted so I can't get a reading on my RPM's. I bought a Laser Optical tachometer on eBay to get a reading on the RPM's. Now here's my question. There are 3 pulleys all connected by one belt. I assume that the true correct reading would be off the main pulley that comes off the motor drive shaft, but I can't access it with the laser. The only pulleys I can access are the water pump pulley and the alternator pulley. Now, the diameters of the water pump pulley and the alternator pulley are much smaller than the main drive pulley. So if I take a reading off them, I am not getting the true engine RPM right?
The water pump pulley is only about 20% smaller than the main drive pulley.
Question- IfI get an idle speed reading of 580 RPM at the water pump pulley, what would be a ballpark figure for the engine RPM?
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