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MG MGB Technical - Tacho information

Hi

I have a 1965 mgb roadster. The problem I have is with the electronic tacho, is its reading about twice as high as it should. I have looked in the archives many articals refer to the following web site

www.corpdemo.com/tiger/techtips/motach.html

I have tried to access this site several times without any success. Does any one have the information from this site saved, or know the cause of my probem.

Thanks

Chris
Chris

Have you confirmed it is the tach i.e. with a multi-meter with a tach scale? I only ask 'cos it could just be the points.

That site went AWOL some time ago, unfortunately.
Paul Hunt

The article is, as Paul notes, no longer active. While having trouble with my tachometer some time back, I printed a copy of the article. I don't have an electronic copy, but I could scan it and send it along if you are interested.

To credit the author, his name is Mark Olson and the website listed his phone number as 1-408-765-4490 and his email address as mark.w.olson@intel.com His last update of the site was 1/5/00. Maybe you could try contacting him for an electronic copy.
Steve Mc

Thanks Steve for this information I will try and Email him for an electronic copy.

Chris

Also, check with John Hubbard, jhubbard37@home.com , as he is quite up on this subject and may have further info for you or might recalibrate yours if needed. FYI.
Bob Muenchausen

These tachometers have an adjustment potentiometer which has a range large enough to calibrate the tach for either 4 or eight cylinder engines. If you disassemble your tach you will find a black round thing on the back of the circuit board with a screw adjustment in the middle of it. This is the adjustment. It is possible to connect the tach to the wiring with the case removed and adjust the tach while the engine is running (but you have to ground the tach). Alternatively, you can drill a hole in the back of the case in the right spot and make adjustments with the tacho in place. You will need a separate tach/dwell meter to provide an accurate reading of engine RPM. This may seem like a daunting task, but it's quite simple. It becomes even less threatening if you have a spare tach around to experiment with.
good luck. If you can get a copy of the Tiger article it is wonderful.
Chris Birdwell

This thread was discussed between 10/02/2002 and 14/02/2002

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.