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Tech Manual
The complete tech manual encompassing all of Johns MG guides.
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MG Factory DVD -Factory Training Films #1, "Pride of Abingdon", "MG Midget Then and Now", "MGB Features", and "Scheduled Maintenance".
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Talking Tour of MGB MKIV - A complex overview of the Mark IV MGB, with detailed instructions of owner operation and some maintenance.
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Under Construction
September 29th, 2008
Q & A: Inaccurate Speedometer
Thursday June 28th, 2007
Hi John;
We just did a conversion from a standard transmission to an overdrive on a '74 MGB. We used the later LH version box and everything went great until we road tested it and noted a slight variation in the speedometer (10 to 12
mph low). We expected there to be a variation and made sure that the pinon gear in the transmission body was right. I guess we didn't take into account that the "gearing" drive in the speedo body would be different or incompatible.??
Our research suggests that there are a couple of solutions, but I would love to hear your suggestion before we dive in and waste a bunch of time.
Thanks!!
Jim!
There are two speedo drive speeds between 1968 and 1980: 1280 turns per mile 68-74; and 1000 tpm between 74/2 and 80. You have installed a 1000 tpm geared OD into a car with a 1280 speedo. So, you're off 20%.
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#152 1957 MGA Engine
Tip of the Day
It makes no difference how quickly your MG will accelerate if it cannot
stop! The proper functioning of your brakes must ALWAYS be at the
top of your list of priorities. You owe this degree of safety to yourself,
your passenger, and all others on the road.
John H. Twist (Fall, 1980)