Country of Origin: United States
Maybe a dumb question, but here goes. I see engine should be at 1500 rpm when testing or doing certain procedures. If the car doesn't have an tach and you are working alone. What is the best way to determine rpm and hold it. just tryin to learn. thanks. this is a great site.
Not a dumb question. You could buy a laser tachometer, but that really seems like overkill. 1500 is about twice the speed of a normal idle. Listen for the engine noise frequency going up just one octave. That's double the frequency.
That's why they sell Tachometers. Laser, clip-on and some on timing lights. Most decoders/analyzers will also display rpm.
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Ken Kopsky
Custom Car Works
"Rules are for the guidance of wise men and the obedience of fools."
Heck it can be tested at 1200, 1500 or 1750. All your trying to do is get the compressor off idle and pumping more in the range in which it was designed to work.
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I certainly agree with that but the stated rpm for testing is to get some consistency when comparing numbers.
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Ken Kopsky
Custom Car Works
"Rules are for the guidance of wise men and the obedience of fools."
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