v8ian
Posted a lot
Posts: 3,758
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Sept 20, 2014 21:09:55 GMT
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Something I have never had, I think I will be needing one for the Austin, are they Mag slip like speedos, Obviously the engine drives a cable which in turn drives the tach, how does the tach work, is it gear drive, or mag slip, which would be dead hand as I can then alter the rev range to suit a face I have in mind,
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Cable drive TachDeleted
@Deleted
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Sept 20, 2014 21:51:56 GMT
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I have never seen a cable driven rev counter, where to they take the drive?
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v8ian
Posted a lot
Posts: 3,758
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Sept 20, 2014 22:02:16 GMT
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Last Edit: Sept 20, 2014 22:07:23 GMT by v8ian
Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,513
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Sept 20, 2014 22:03:56 GMT
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The only car I've had with one was a Series 3A Rapier. Pretty sure that was 'mag slip' as it had a bit of a life of its own!
dolly, of the post war stuff I've seen drive is normally taken off the distributor shaft via the housing the dizzy slips in to.
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Follow your dreams or you might as well be a vegetable. |
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Cable drive TachDeleted
@Deleted
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Sept 20, 2014 22:33:55 GMT
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Dizzy shaft seems to make a lot of sense.
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Sept 20, 2014 22:41:10 GMT
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Yep, they're just like a speedometer, except driven by the engine. Usually "geared down" from the engine speed by 2, 4, or 6:1, which is written on the gauge. So if you spin the cable at 1500rpm on a 2-1 tach, it'll read 3000rpm - allowing for 1:1 gearing from the dizzy or camshaft, which of course turn at half crankshaft speed.
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786 
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Sept 21, 2014 20:51:59 GMT
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The earlier triumph six cylinder (and four I think?) are all cable driven tachometer, with the drive built in to the base of the actual distributor. The later ones went electronic, driven off the ht coil.
I think they changed somewhere in the early 70's
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Sept 21, 2014 21:14:18 GMT
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They are common on older bikes. I think I've only ever had one or two without. There will be a helical gear in the head or cam cover which meshes with one of the cam shafts, very similar to a speedo cable drive off the back of a car gearbox.
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Sept 23, 2014 13:57:54 GMT
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v8ian
Posted a lot
Posts: 3,758
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Sept 23, 2014 20:21:33 GMT
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nice n cheap, but, I'm going to need a 9k tach  |
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Sept 23, 2014 20:55:19 GMT
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old bikes and cars with cable driven Tacho's are the Chronometric type which are actually clockwork but driven by the cable. they are very accurate but usually very expencive. £1000's usually.
the S800 has a cable driven tacho which is the magnetic type which reads up to 11,000 rpm.
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Sept 23, 2014 21:00:39 GMT
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in fact iv'e just gone out and found the guts of an S800 rev counter you can have for free.
i'll leave it by the side door if you want to pick it up.
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v8ian
Posted a lot
Posts: 3,758
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Sept 23, 2014 21:05:43 GMT
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That's very nice of you, I might do a flypast on the way into work in the morning, about 7ish, if that's ok?? Thankyou,  |
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Sept 23, 2014 21:12:23 GMT
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tis outside in a yellow tub.
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Sept 24, 2014 17:18:00 GMT
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nice n cheap, but, I'm going to need a 9k tach Show off....  |
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