Rev counter

[joha]

Hi

Can any one advise on fitting a rev counter.

Engine is a volvo MD 7B it runs fine very quiet and have had noprobs with it even though it must be almost 30 years old.

Thanks

John

 

[barnaclephill]

http://www.tinytach.com/tinytach/index.php

might be worth a look at. I haven't any rev counter on mine: I just listen and view and guess, and see black smoke when revving the engine too hard.

 

[joha]

Ta

So do i, thought i might show a bit of kindness to the old lump!

J

 

[saltwater_gypsy]

Go to http://www.asap-supplies.com. Rev counters for about £50. Check that your alternator has a W terminal.
So, with a bit of time, effort and money your'e all set!!

 

[RichardTaylor]

Seconded

 

[joha]

Thanks Guys

looks like it should be straight forward enough!

J

 

[fishermantwo]

I use a push bike speedo. Sensor fitted to front pulley. Speedo set to 24 inch wheel and Kph. Gives RPM but out by one decimal place. 1000 rpm shows as 100. Battery lasts about 3 years, not as long as on a bike if your boat is on a mooring and boats movement starts it up.

 

[VicS]

[ QUOTE ]
Check that your alternator has a W terminal

[/ QUOTE ] If its the original very unlikely as the revcounters when fitted had a sensor mounted on the timing gear cover. Part #15 in This drawing

 

[Amulet]

I just bought a tiny tach. Not fitted it yet. If it does what it says it'll be great - and I have no reason to believe it won't.
It works by clamping on to an injector tube and feeling the diminution in diameter when it squirts. Gives hours run and revs. Has the ability to set alarms for service due (several) and max revs.

My reason for buying it was to get accurate hours run. Present hours meter records when the power is on to the engine, and I often forget to switch it off even when I've stopped the engine.

Will let you know how I get on with it. It looks dead easy to fit.

 

[joha]

Thanks Vics.

It isn't the original this one has 3 connection points and i assume the unused one will be the W terminal?

J

 

[William_H]

Just one comment about the Tiny Tach. You will note it says update every 2.5 seconds. You will find in practice that 2.5 seconds is a long time as you wait for a new reading. Especially as you accelerate the engine. It certainly won't show up fluctuations. This is typical of most digital readout devices.
Note also that most tachs have to be calibrated ie adjusted to allow for alternator pulley sizes if it runs off W or Aux terminal.

olewill