First Generation Ascots > Tech Section

Speedo/tacho Ratio

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colosseumrat:
They have nice stuff indeed :)

J6G1Z:
I copied this post from the Yahoo Ascot Owners Group.

Put my thinking cap on and pulled the tach drive off my FT500 this
afternoon. Counted the revolutions of the driven gear (the one that
mates to the cam) and got 2 full revolutions there to 1 full
revolution of the shaft that the cable for the tach drive hooks
into. So is that 1:2 or 2:1? Anyway it's not 1:1.

Neil

Thank you Neil for checking this out & providing this valuable information.
J.

colosseumrat:
Thanks all for the additional info.

J6G1Z:

--- Quote from: colosseumrat on February 11, 2014, 08:50:12 am ---Thanks all for the additional info.
--- End quote ---

No problem. I will keep adding to the post if more information trickles in.

Please let us know anything that you might find out also.

Thanks
J.

J6G1Z:
Uh-Oh... ???

Here is another bit of info to muddy the waters some.....

Neil wrote:

>> Counted the revolutions of the driven gear (the one that
mates to the cam) and got 2 full revolutions there to 1 full
revolution of the shaft that the cable for the tach drive hooks
into.  So is that 1:2 or 2:1?  Anyway it's not 1:1. >> 

Don’t forget, the cam turns at half speed of the crankshaft, so sounds like 4:1

Now what?
J.
 

 

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