When we have installed the 5 speed trans in the shop we have gone two
ways to solve the speedo problem.
1. Install a speedo cable gear ratio box in line
2. re gear the speedo to read accurate
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
On Sep 7, 2005, at 1:35 PM, James Lea wrote:
> David. I have a BT7 with a Lempert rear end and I have been struggling
> with this same problem. I sent my speedo off to MOMA after doing all
> of the recommended measurements and it came back at least 10% off. I
> talked to Margaret just today and according to her they have no way to
> recalibrate an odometer using RPM's. It must be revs of the cable over
> a measured distance. So now my plan is to follow my wife's Camry and
> go 40, 50 and 60 and see what the Healey speedo reads. On the way back
> from Limerock last weekend I checked it against measured miles on the
> expressway. At 3000 RPM in OD I averaged a mile in 49.6 secs. which
> comes out to 72.61 MPH. Unfortunately I didn't think to check it
> without the OD.
>
> The best info I have seen on this subject is at
> http://www.ewilkins.com/wilko/healeygears.htm.
>
> According to the chart at 3000 RPM you should be at 58 MPH with a
> factory 3.91 rear end and 64 MPH with the optional 3.55 with no OD.
> Cheers, JL
>
> James Lea
> 2 West St. PO Box 25
> Rockport Maine 04856
>
> 1952 MG TD Vintage Racer
> 1953 Triumph Mayflower
> 1958 Rover P4
> 1962 Austin Healey 3000 BT7
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