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| Aftermarket tachometer for 3 cylinder?; Want it for testing and timing the engine. | |
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| Tweet Topic Started: Dec 8 2012, 08:16 PM (9,448 Views) | |
| BMasiak | Oct 27 2013, 05:06 PM Post #16 |
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Member
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I have a tach from HF that has the 4-6-8 setting. At first I set it to 6 cylinders, and multiplied the tach by 2, but now run it on 4, and it's pretty close. It's pretty simple math, when it shows 1000rpm it's at ~1333rpm, 1500 is ~2000 etc. |
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| PTA2PTB | Oct 27 2013, 05:13 PM Post #17 |
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I'm totally awesome! I swear.
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Now that's in my price range. Know anyone that's bought one? I'd like to get some feedback on how well they work before bustin out $9.98 + shipping for one. |
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| David95237 | Oct 27 2013, 05:20 PM Post #18 |
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I use one for small motor repair. you tell it if its two or four cycle and put the wire around a spark plug wire. But I have used it on a Metro also. For test purposes. |
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| truckjohn | Oct 27 2013, 06:18 PM Post #19 |
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So... Why would you need a crazy correction factor? They key off of the spark signal to the #1 cylinder... It fires 1x per 2 revolutions like basically every 4-stroke engine.... There is no correction factor for 3 to 4 cylinders like on the factory gage tach cluster... Those count ALL the sparks to all the cylinders... On a factory gage cluster - you gotta fix the 4/3 thing... but that doesn't apply when you clip the clippy thing to the #1 spark wire... Thanks |
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| BMasiak | Oct 27 2013, 11:57 PM Post #20 |
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Most of them do not key off the spark signal to the #1 cylinder. Not unless you get one that has a pickup for the spark plug wire, which doesn't seem to be all that common in the cheaper tachs. |
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| perfesser | Oct 28 2013, 12:46 PM Post #21 |
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Elite Member - Former Metro owner
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It will if you have a 1.3. |
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| 1 user reading this topic (1 Guest and 0 Anonymous) | |
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2:17 PM Jul 11