Please have a look at the first item in this link:

http://www.aetnaengineering.com/tachometer-senders-sensors.asp

I wonder if anyone could point me towards a supplier of something similar in 
the UK?

It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(

Cheers Julian.

On 28 Oct, 21:45, "Julian"  wrote:
> Please have a look at the first item in this link:
>
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>
> I wonder if anyone could point me towards a supplier of something similar in
> the UK?
>
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>
> Cheers Julian.

looks very similar to the rover pg1 gearbox one .

the gearbox is found on the 2 ltr T-sreries and diesel engines  fitted
to 220 420 600 and 800.

all the best.markj

In uk.rec.engines.stationary Julian  wrote:
> Please have a look at the first item in this link:
> 
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
> 
> I wonder if anyone could point me towards a supplier of something similar in 
> the UK?
> 
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(

The Eagle was used in a wide range of British trucks including ERF.
Dealers may still have some old stock.

"mark"  wrote in message 
news:dc1043f5-23f5-480c-aa1d-199128d63b92@b2g2000yqi.googlegroups.com...
> On 28 Oct, 21:45, "Julian"  wrote:
>> Please have a look at the first item in this link:
>>
>> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>>
>> I wonder if anyone could point me towards a supplier of something similar 
>> in
>> the UK?
>>
>> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt
>> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>>
>> Cheers Julian.
>
> looks very similar to the rover pg1 gearbox one .
>
> the gearbox is found on the 2 ltr T-sreries and diesel engines  fitted
> to 220 420 600 and 800.

Thanks, will check this out.

Julian,

wrote in message 
news:hcag7n$lt0$1@news.albasani.net...
> In uk.rec.engines.stationary Julian  wrote:
>> Please have a look at the first item in this link:
>>
>> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>>
>> I wonder if anyone could point me towards a supplier of something similar 
>> in
>> the UK?
>>
>> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt
>> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>
> The Eagle was used in a wide range of British trucks including ERF.
> Dealers may still have some old stock.

Yes, it's from an ERF E12 (12 litre Roller) I've tried a dealer or three, 
they all laugh, I've a few more scrapyards to ring today. I think you're 
confusing dealers of old to the ones today run by the bean counters. You're 
lucky if they have an oil filter on the shelf nowadays :-(

Julian.

Julian wrote:
>  wrote in message 
> news:hcag7n$lt0$1@news.albasani.net...
>> In uk.rec.engines.stationary Julian  wrote:
>>> Please have a look at the first item in this link:
>>>
>>> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>>>
>>> I wonder if anyone could point me towards a supplier of something similar 
>>> in
>>> the UK?
>>>
>>> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt
>>> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>> The Eagle was used in a wide range of British trucks including ERF.
>> Dealers may still have some old stock.
> 
> Yes, it's from an ERF E12 (12 litre Roller) I've tried a dealer or three, 
> they all laugh, I've a few more scrapyards to ring today. I think you're 
> confusing dealers of old to the ones today run by the bean counters. You're 
> lucky if they have an oil filter on the shelf nowadays :-(

Try Speedograph Richfield Ltd at
http://www.speedograph-richfield.com/


-- 
Michael Clarke

As an ex-electronics engineer by profession, I would offer the warning that 
the electrical output pulses would need to be of the correct amplitude and 
duration to "match" with whatever it is feeding into.
Sorry if I am "teaching my granny to suck eggs", but thought that a comment 
in time may prevent you from spending money on something which may not work!


-- 
Peter Chadbund
The Douglas Stationary Engine Resource
www.duster.org.uk


"Julian"  wrote in message 
news:5Y2Gm.16567$MG6.7939@newsfe13.ams2...
> Please have a look at the first item in this link:
>
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>
> I wonder if anyone could point me towards a supplier of something similar 
> in the UK?
>
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>
> Cheers Julian.
>

What about taking a feed from the alternator W terminal?
Or have you already got a petrol tacho?

moray

"Julian"  wrote in message 
news:5Y2Gm.16567$MG6.7939@newsfe13.ams2...
> Please have a look at the first item in this link:
>
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>
> I wonder if anyone could point me towards a supplier of something similar 
> in the UK?
>
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>
> Cheers Julian.
>

"THE DOUGLAS STATIONARY ENGINE RESOURCE (admin)"  wrote 
in message news:8c2dnU1hAoKQHXTXnZ2dnUVZ8mOdnZ2d@brightview.co.uk...
> As an ex-electronics engineer by profession, I would offer the warning 
> that the electrical output pulses would need to be of the correct 
> amplitude and duration to "match" with whatever it is feeding into.
> Sorry if I am "teaching my granny to suck eggs", but thought that a 
> comment in time may prevent you from spending money on something which may 
> not work!

That's a fair point, and one that hadn't escaped my attention. The trouble 
is I don't know exactly how it works or what output to expect. It ''feel'' 
(when you turn it) like an old generator that used to rest on a bicycle 
tyre. I'm guessing that it's a simple AC alternator, frequency proportional 
to RPM? A fair assumption or not?

Cheers Julian.

"moray"  wrote in message 
news:HpfGm.2268$zy1.782@newsfe14.iad...
> What about taking a feed from the alternator W terminal?
> Or have you already got a petrol tacho?

There's no W terminal, already checked :-( The ERF EC's changed to the W 
terminal, mine is just pre W terminal.

I'm not in the least bit sure if a W terminal output would match that of the 
tacho genny that I have at the moment?

Julian.

PS, found a breakers in Darwin (not too far from me) with a few Rollers 
lying around - say I'm welcome to come and have a look-see.

Julian.

Julian wrote:
> Please have a look at the first item in this link:
> 
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
> 
> I wonder if anyone could point me towards a supplier of something similar in 
> the UK?
> 
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
> 
> Cheers Julian. 
> 
> 

How many wires coming out of it ?. That is, is this an optical, hall 
effect or other magnetic  sensing device internally. If you can get the 
lid off it, can you post a jpg somewhere so we can see the internals ?.

If it's two wire, then it probably uses a simple magnetic reluctance 
sensor. Otherwise, some electronics inside...

Regards,

Chris

"ChrisQ"  wrote in message 
news:8HkGm.21374$k74.17500@newsfe17.ams2...
> Julian wrote:
>> Please have a look at the first item in this link:
>>
>> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>>
>> I wonder if anyone could point me towards a supplier of something similar 
>> in the UK?
>>
>> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
>> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>>
>> Cheers Julian.
>
> How many wires coming out of it ?. That is, is this an optical, hall 
> effect or other magnetic  sensing device internally. If you can get the 
> lid off it, can you post a jpg somewhere so we can see the internals ?.
>
> If it's two wire, then it probably uses a simple magnetic reluctance 
> sensor. Otherwise, some electronics inside...


It's a simple two wire jobby (non polarity sensitive) . I think it's 
probably two wire and not one wire because the truck does not use the 
chassis as a return circuit for electrical equipment. There's nothing fancy 
about it at all. Unfortunately it is assembled in a way that makes taking 
apart without damage impossible :-(

I've tested it with an AVO. So far I've spun it up with the cordless drill 
and measured Hz, Volts AC & DC but I've not found an output that seems to 
correlate with RPM. However this sort of thing isn't really by forte and 
don't really know what I should be looking for.

I've proved the integrity of the wiring between tacho genny and instrument 
panel (which is made of unobtanium) so I'm just problem solving by process 
of elimination really.

Thanks Julian.

On Thu, 29 Oct 2009 19:31:11 -0000, Julian wrote:

> I've tested it with an AVO. So far I've spun it up with the cordless 
> drill and measured Hz, Volts AC & DC but I've not found an output that 
> seems to correlate with RPM. 

It's not just a simple switch is it?

-- 
Cheers
Dave.

Julian wrote:
> Please have a look at the first item in this link:
>
> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>
> I wonder if anyone could point me towards a supplier of something similar in 
> the UK?
>
> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>
> Cheers Julian. 
>
>
>   
I've no idea if it's suitable but a number of VWs have an electric 
sensor that plugs into the gearbox, I think it's a hall sensor. The 
beauty is some of the vehicles using the gearbox have a cable drive and 
others the electric sensor which connects to the same gearbox fitting as 
the cable drive. The electric sensor unit is driven by a square shaft 
about 3mm AF which fits into the gearbox in the same way as a cable 
would. My VW  has it and is a 1995 Passat. Might be adaptable.

On Thu, 29 Oct 2009 20:54:40 +0000, Dave Liquorice wrote:

> On Thu, 29 Oct 2009 19:31:11 -0000, Julian wrote:
> 
>> I've tested it with an AVO. So far I've spun it up with the cordless 
>> drill and measured Hz, Volts AC & DC but I've not found an output that 
>> seems to correlate with RPM. 
> 
> It's not just a simple switch is it?

I wouldn't expect a mechanical switch, but a hall sensor's a distinct
possiblity.

If a ahll sensor then it should give an AC waveform when the shaft's
rotated I would have thought, but how clean that signal would be or what
amplitude I don't know - maybe an AVO's expecting a nice clean sine wave
or something, and what the sensor throws out is a series of spikes...
putting it on a 'scope might be the only way to truly test it.

Jules wrote:
> On Thu, 29 Oct 2009 20:54:40 +0000, Dave Liquorice wrote:
> 
>> On Thu, 29 Oct 2009 19:31:11 -0000, Julian wrote:
>>
>>> I've tested it with an AVO. So far I've spun it up with the cordless 
>>> drill and measured Hz, Volts AC & DC but I've not found an output that 
>>> seems to correlate with RPM. 
>> It's not just a simple switch is it?
> 
> I wouldn't expect a mechanical switch, but a hall sensor's a distinct
> possiblity.
> 
> If a ahll sensor then it should give an AC waveform when the shaft's
> rotated I would have thought, but how clean that signal would be or what
> amplitude I don't know - maybe an AVO's expecting a nice clean sine wave
> or something, and what the sensor throws out is a series of spikes...
> putting it on a 'scope might be the only way to truly test it.
> 
> 

It guess it could be a hall / solid state sensor with an open collector 
output, which would need a load resistor at the other end of the wire. 
To check this, are both leads the same colour and if not, what do you 
get if you measure the volts at the device the sensor plugs into ?. 
Also, what does the avo read on ohms range if you turn the shaft slowly 
by hand ?.

It's probably unlikely to be a mechanical contact switch as the life 
wouldn't be anything like good enough...

Regards,

Chris

On Thu, 29 Oct 2009 17:43:28 -0500, Jules wrote:

>> It's not just a simple switch is it?
> 
> I wouldn't expect a mechanical switch, 

Reed switches will take the number of operations required but might
not be quite robust enough for use on an engine.

> but a hall sensor's a distinct possiblity.

That is a distinct possibilty. This particular senor beinga two wire
device it may not produce a sensible output unless it has the proper
bias voltage/current.

-- 
Cheers
Dave.

Julian wrote:
> "moray"  wrote in message 
> news:HpfGm.2268$zy1.782@newsfe14.iad...
>> What about taking a feed from the alternator W terminal?
>> Or have you already got a petrol tacho?
> 
> There's no W terminal, already checked :-( The ERF EC's changed to the W 
> terminal, mine is just pre W terminal.
> 
> I'm not in the least bit sure if a W terminal output would match that of the 
> tacho genny that I have at the moment?
> 
> Julian.
> 
> PS, found a breakers in Darwin (not too far from me) with a few Rollers 
> lying around - say I'm welcome to come and have a look-see.
> 
> Julian. 
> 
> 
Darwin ?  Australia , or is there another Darwin I didn't know about ?

-- 
Kevin (Bluey)
"I'm not young enough to know everything."

bluey69@west.net.com.au

"Kevin(Bluey)"  wrote in message 
news:GtudnUZiV_4SGXfXnZ2dnUVZ7t5i4p2d@westnet.com.au...
> Julian wrote:
>> "moray"  wrote in message 
>> news:HpfGm.2268$zy1.782@newsfe14.iad...
>>> What about taking a feed from the alternator W terminal?
>>> Or have you already got a petrol tacho?
>>
>> There's no W terminal, already checked :-( The ERF EC's changed to the W 
>> terminal, mine is just pre W terminal.
>>
>> I'm not in the least bit sure if a W terminal output would match that of 
>> the tacho genny that I have at the moment?
>>
>> Julian.
>>
>> PS, found a breakers in Darwin (not too far from me) with a few Rollers 
>> lying around - say I'm welcome to come and have a look-see.
>>
>> Julian.
> Darwin ?  Australia , or is there another Darwin I didn't know about ?

The proper Darwin - in Lancashire :-)

Julian.

On Fri, 30 Oct 2009 06:33:13 -0000, "Julian"  wrote:


>
>The proper Darwin - in Lancashire :-)

That'll be Darwen then.

-- 
brightside S9

"brightside S9" <address@replyto_is_not.invalid> wrote in message 
news:s3cle59mobb80cfnu1leqgnlh1fahs6d29@4ax.com...
> On Fri, 30 Oct 2009 06:33:13 -0000, "Julian"  wrote:
>
>
>>
>>The proper Darwin - in Lancashire :-)
>
> That'll be Darwen then.

It can be Dar whatever you like provided there's a tach genny there :-)

Julian.

"Julian"  wrote in message 
news:5ZzGm.13852$1i2.7294@newsfe07.ams2...
>
> "brightside S9" <address@replyto_is_not.invalid> wrote in message 
> news:s3cle59mobb80cfnu1leqgnlh1fahs6d29@4ax.com...
>> On Fri, 30 Oct 2009 06:33:13 -0000, "Julian"  wrote:
>>
>>
>>>
>>>The proper Darwin - in Lancashire :-)
>>
>> That'll be Darwen then.
>
> It can be Dar whatever you like provided there's a tach genny there :-)
>
> Julian.
>

What about the ones used in the old Leyland Jaguars!


Steve R.

On Fri, 30 Oct 2009 11:19:40 -0000, "Julian"  wrote:

>
>"brightside S9" <address@replyto_is_not.invalid> wrote in message 
>news:s3cle59mobb80cfnu1leqgnlh1fahs6d29@4ax.com...
>> On Fri, 30 Oct 2009 06:33:13 -0000, "Julian"  wrote:
>>
>>
>>>
>>>The proper Darwin - in Lancashire :-)
>>
>> That'll be Darwen then.
>
>It can be Dar whatever you like provided there's a tach genny there :-)
>

Tach genny or no tach genny you can take few minutes whilst you are
there to admire the India Mills chimney.

-- 
brightside S9

"brightside S9" <address@replyto_is_not.invalid> wrote in message 
news:f54oe5hv7n34kfklnd7c033u0olem43pf3@4ax.com...
> On Fri, 30 Oct 2009 11:19:40 -0000, "Julian"  wrote:
>
>>
>>"brightside S9" <address@replyto_is_not.invalid> wrote in message
>>news:s3cle59mobb80cfnu1leqgnlh1fahs6d29@4ax.com...
>>> On Fri, 30 Oct 2009 06:33:13 -0000, "Julian"  wrote:
>>>
>>>
>>>>
>>>>The proper Darwin - in Lancashire :-)
>>>
>>> That'll be Darwen then.
>>
>>It can be Dar whatever you like provided there's a tach genny there :-)
>>
>
> Tach genny or no tach genny you can take few minutes whilst you are
> there to admire the India Mills chimney.


I'll certainly do that, anything else needing looking at too - engines 
perhaps?

Julian.

"Julian"  wrote in message 
news:14mGm.32356$fq2.6857@newsfe18.ams2...
>
> "ChrisQ"  wrote in message 
> news:8HkGm.21374$k74.17500@newsfe17.ams2...
>> Julian wrote:
>>> Please have a look at the first item in this link:
>>>
>>> http://www.aetnaengineering.com/tachometer-senders-sensors.asp
>>>
>>> I wonder if anyone could point me towards a supplier of something 
>>> similar in the UK?
>>>
>>> It's for a Rolls Royce (Perkins) Eagle engine but I could probably adapt 
>>> anything 1/2 suitable to fit. Too old for most scrapyards nowadays :-(
>>>
>>> Cheers Julian.
>>
>> How many wires coming out of it ?. That is, is this an optical, hall 
>> effect or other magnetic  sensing device internally. If you can get the 
>> lid off it, can you post a jpg somewhere so we can see the internals ?.
>>
>> If it's two wire, then it probably uses a simple magnetic reluctance 
>> sensor. Otherwise, some electronics inside...
>
>
> It's a simple two wire jobby (non polarity sensitive) . I think it's 
> probably two wire and not one wire because the truck does not use the 
> chassis as a return circuit for electrical equipment. There's nothing 
> fancy about it at all. Unfortunately it is assembled in a way that makes 
> taking apart without damage impossible :-(
>
> I've tested it with an AVO. So far I've spun it up with the cordless drill 
> and measured Hz, Volts AC & DC but I've not found an output that seems to 
> correlate with RPM. However this sort of thing isn't really by forte and 
> don't really know what I should be looking for.
>
> I've proved the integrity of the wiring between tacho genny and instrument 
> panel (which is made of unobtanium) so I'm just problem solving by process 
> of elimination really.
>
> Thanks Julian.
>
hello Julian painted my mower now, changed the engine, hopefully the rain 
will stop soon so I can give it a whirl.
Thanks!
Gill electronics make the sensors for the new Triumphs 
http://www.gill.co.uk/. they have something that 'looks' similar.

Also I have recently had a crankshaft magnetic pick up rewound by 
http://www.westcountrywindings.co.uk/services.htm

A magnetic sensor should have 'some' resistance, when you put an ohmmeter on 
it. when you put the sensor near to a lump of metal the resistance will go, 
or vice versa. All the best B