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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Sat Nov 18, 2017 4:04 pm Post subject: Rev counter take off |
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Hi all,
I'm sure that I have posted this question before so forgive me if I have.
I am almost finished with my Aero Minx Streamlined restoration and almost forget that I never did solve the rev counter take off problem.
I have a C39 or equivalent dynamo with a threaded rev counter take off at the rear end, I also have a 2-1 Smiths rev counter R-R 8 423.
If my crankshaft and dynamo pulleys are the same diameter I can assume that the ratio is to that point 1:1. As the rev counter is marked 2-1 can I therefore assume that I need a reduction gear at the dynamo ?
Really not sure about this
Many thanks,
Tim |
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Penman
Joined: 23 Nov 2007 Posts: 4763 Location: Swindon, Wilts.
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Posted: Sat Nov 18, 2017 4:56 pm Post subject: |
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Hi
Is the picture the back of the Dynamo?
I ask because the take off does not appear to be in-line with the spindle, in which case you need to know if there is a gearing difference in there. _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Sun Nov 19, 2017 1:04 am Post subject: |
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Hi,
No it is the back of the rev counter, the square pin will centre when the correct cable fitting is screwed on |
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alastairq
Joined: 14 Oct 2016 Posts: 1955 Location: East Yorkshire
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Posted: Sun Nov 19, 2017 12:58 pm Post subject: |
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I think what penman meant is, the whole take-off drive is not in line with the dynamo shaft? Rather, it is offset, indicating there may be gearing inside? |
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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Sun Nov 19, 2017 6:36 pm Post subject: |
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Yes, of course, I misunderstood
As I said though the gauge is marked 2-1
What I would like to know is, am I correct in thinking that if the output from the dynamo is 1-1 due to the crank and dynamo pulleys being the same diameter, then I simply need a direct drive cable between dynamo and gauge ?
I can of course simply experiment but would rather not have to buy more than one cable.
Many thanks |
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peter scott
Joined: 18 Dec 2007 Posts: 7120 Location: Edinburgh
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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Mon Nov 20, 2017 8:17 pm Post subject: |
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Thanks Peter, I have dropped them a line for advice and await a response. |
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MVPeters
Joined: 28 Aug 2008 Posts: 822 Location: Northern MA, USA
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Posted: Mon Nov 20, 2017 11:25 pm Post subject: |
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Could you stick a plastic straw, maybe bent to a right-angle to give you a pointer, into the gearbox end?
Then turn the dynamo - you could probably tell if it's 1:1 or 1:2 or something else. _________________ Mike - MVPeters at comcast.net
2002 MINI Cooper 'S' |
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