What's the opinion on having a fixed driving fork with no shear key or means of slipping if the cable seized for instance. Please note the set up I have is not the standard ET224 design of fork.
Tach Drive Fork
- Thread starter brian gains
- Start date
Hi Brian, I have the the same arrangment I do worry what if, the Taco reading can
be a little slow, with not doing a lot of running it should be ok But I do leave the
drive bit out sometimes. At least there is plenty of oil around the drive.
be a little slow, with not doing a lot of running it should be ok But I do leave the
drive bit out sometimes. At least there is plenty of oil around the drive.
"reading slow" would only happen momentarily before complete failure of one of the tach' drive components (or dropping engine revs).
The chronometric tach reads about 300 rpm slow if you are racing and happen to glance at the tach while it is catching up. Coburn Benson had this problem when racing the Flash. He purchased a Smith ATC tach to solve the problem as the chronometric was shifting at 8300 instead of the planned 8000 as an average.
David
David
don't mean to be a pedant but that kind of lag must be in the tach' head,
Can you post a photo?
just got it buttoned up , but very straight forward.
bolted bridge plate on spacers across steel replacement pinion ET48, ( drives EI) from the centre of the plate is a machined drive fork for the tacho drive,
in my case the tacho was mot working so chased it back and found the drive fork , which initially appeared to just have had its spigot press fitted into the bridging plate was no longer an interferance fit and was only held in place by the male drive on the tacho gear and loosely supported by the plate. I try not to think what mechanical and physical mayhem would have been unleashed had it gone walkies in the timing chest.
On inspection it was meant to have been held in place by a spot weld that did not have any penetration and failed. Fingers X'd my weld is a little more robust.
bolted bridge plate on spacers across steel replacement pinion ET48, ( drives EI) from the centre of the plate is a machined drive fork for the tacho drive,
in my case the tacho was mot working so chased it back and found the drive fork , which initially appeared to just have had its spigot press fitted into the bridging plate was no longer an interferance fit and was only held in place by the male drive on the tacho gear and loosely supported by the plate. I try not to think what mechanical and physical mayhem would have been unleashed had it gone walkies in the timing chest.
On inspection it was meant to have been held in place by a spot weld that did not have any penetration and failed. Fingers X'd my weld is a little more robust.