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1. electric tach question (score: 1): Author: Unknown; Date: Tue, 5 Oct 1999 13:25:09 -0600 charset="iso-8859-1"; I have a question for those on the list who have some automotive electrical I have a multi-function digital multimeter which has a frequency function. It measures the frequency as cycles per second (; /html/triumphs/1999-10/msg00252.html (7,340 bytes)
2. Re: electric tach question (score: 1): Author: Unknown; Date: Tue, 05 Oct 1999 15:41:32 -0400; A 6 cylinder engine fires 3 times per crankshaft revolution. Divide the frequency of the coil output by 3 and that should be your RPM. Good luck! Brian Schlorff '61 TR-4 '64 TR-4 '72 TR-6 '79 Spit --; /html/triumphs/1999-10/msg00254.html (8,450 bytes)
3. Re: electric tach question (score: 1): Author: Unknown; Date: Tue, 05 Oct 1999 16:21:51 -0400; Divide it by 3 and you've got the number of revolutions per second, not per Multiply your reading by 20 (60 seconds in a minute, and the meter reads pulses per second, then divide it by 3).; /html/triumphs/1999-10/msg00257.html (9,399 bytes)
4. RE: electric tach question (score: 1): Author: Unknown; Date: Tue, 5 Oct 1999 12:38:34 -0700charset="iso-8859-1"; Your 6 cylinder, 4 cycle engine fires 3 times per revolution (each cylinder fires every other revolution), so the RPM should be 20 times the frequency in Hz. (eg 1200 rpm = 60 Hz) . However, dependi; /html/triumphs/1999-10/msg00261.html (8,542 bytes)
5. RE: electric tach question (score: 1): Author: Unknown; Date: Tue, 5 Oct 1999 16:03:19 -0600 charset="iso-8859-1"; That's what I had figured out. But... My readings were pretty much equal to the tach reading (except that the DMM was showing "sparks" per *second* and the tach revs per minute). ie. At idle, the ta; /html/triumphs/1999-10/msg00264.html (7,603 bytes)
6. RE: electric tach question (score: 1): Author: Unknown; Date: Tue, 5 Oct 1999 15:38:46 -0700charset="iso-8859-1"; Yes, I think it's just coincidence the readings match. The DMM is counting the multiple zero crossings as the primary of the coil 'rings' after each spark. The ratio of true to apparent reading will; /html/triumphs/1999-10/msg00271.html (7,476 bytes)
7. Electric Tach question (score: 1): Author: Unknown; Date: Sat, 3 Jul 99 08:01:44 -0700; I currently have a car with a four cylinder engine. I have a neg. earth MGB tach counting the revs. The engine will very soon be replaced by an 8 cylinder engine ("Dr. X will build a creature"). I'm; /html/triumphs/1999-07/msg00156.html (7,583 bytes)
8. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sat, 03 Jul 1999 14:30:47 -0400; If the tach is a Smith's, similar to your TR3, then a Stag tachometer looks much the same and is calibrated for an 8 cylinder. 8 cylinder engines weren't exactly common among british vehicles during; /html/triumphs/1999-07/msg00167.html (8,922 bytes)
9. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sat, 03 Jul 99 19:50:24 PDT; You need to get an electronics student to make up a simple divider cicuit to go in the trigger line. i.e. a little black box that gives one pulse out for two pulses in. Try your local college. Matt; /html/triumphs/1999-07/msg00170.html (8,124 bytes)
10. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sat, 03 Jul 1999 15:33:12 -0700; Many years ago I had a cheap hand-held tach with a slide switch for selecting 4, 6 or 8 cylinders. This leads me to suspect there's a simple electronic component that can alter the signal appropriate; /html/triumphs/1999-07/msg00179.html (7,883 bytes)
11. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sat, 03 Jul 1999 18:22:28 -0700; It depends on the circuit, but most of them use a simple RC frequency to voltage converter circuit, where the output can be scaled by changing a single resistor. Thus, your hand-held tach probably ha; /html/triumphs/1999-07/msg00181.html (9,025 bytes)
12. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sat, 03 Jul 1999 18:36:33 -0700; I have examined the insides of a Spit's Smiths electronic tach and it is controlled by a Texas Instruments integrated circuit. This circuit is a custom product made specifically for Smiths to incorpo; /html/triumphs/1999-07/msg00183.html (10,583 bytes)
13. Re: electric tach question (score: 1): Author: Unknown; Date: Sun, 4 Jul 1999 12:58:16 -0700; A divider circuit will probably do the job, but I'd recommend contacting APT Speedo Specialists (see the monster list) for a complete in-the-case conversion.; /html/triumphs/1999-07/msg00211.html (7,407 bytes)
14. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sun, 04 Jul 99 17:41:47 PDT; As I said previously the simple way to do this is to get someone who's skilled at electronics construction to build a simple divide by 2 circuit on a piece of veroboard or similar. Dividers are stand; /html/triumphs/1999-07/msg00213.html (8,552 bytes)
15. Re: Electric Tach question (score: 1): Author: Unknown; Date: Sun, 4 Jul 1999 22:00:48 -0400; Joe et al: I am not familiar with this vintage electric tach but I'll bet it is a standard LM2907 F/V IC. Changing it to work on a V8 will be easy once one figures out which component to change. Howe; /html/triumphs/1999-07/msg00226.html (9,168 bytes)
16. Re: Electric Tach question (score: 1): Author: Unknown; Date: Tue, 6 Jul 1999 13:57:10 -0400; how about divide by two. the points opening and closeing sends the pulses to the electric tach and since there are twice as many pulses per revolution divide by two.......; /html/triumphs/1999-07/msg00315.html (7,602 bytes)
17. Re: Electric Tach question (score: 1): Author: Unknown; Date: Tue, 6 Jul 1999 15:40:26 EDT; Joe, I'm listening, and I "sorta" could whip out a circuit, but getting from the functional design to the real world fix would be a bit of a job. Most of these type circuits are intended for computor; /html/triumphs/1999-07/msg00321.html (8,940 bytes)
18. RE: Electric Tach question (score: 1): Author: Unknown; Date: Tue, 6 Jul 1999 13:37:34 -0700; In theory, it's trivial. In practice, not so easy. As others have said, first you have to come up with a power supply suitable for modern electronics (car electrical systems are _very_ nasty places f; /html/triumphs/1999-07/msg00333.html (8,855 bytes)
19. Re: Electric Tach question (score: 1): Author: Unknown; Date: Tue, 6 Jul 1999 19:37:42 EDT; http://www.zaks.com/mgb/ Dan Masters, Alcoa, TN '71 TR6--3000mile/year driver, fully restored '71 TR6--undergoing full restoration and Ford 5.0 V8 insertion - see: http://members.aol.com/danmas/ '74; /html/triumphs/1999-07/msg00341.html (7,522 bytes)
20. RE: Electric Tach question (score: 1): Author: Unknown; Date: Wed, 7 Jul 1999 16:43:42 +0100; speaking of tachs, is anyone able to resolve the mystery of properly wiring up a Sprite tach, I have one in one of my Minis and was till now unable to get the thing going. (electrically challenged as; /html/triumphs/1999-07/msg00382.html (9,839 bytes)

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