Afternoon all

It's been a while since I've confused myself with electrickery on here so it's time to ask for help again.

I'm trying to calibrate my tacho as it's reading half the correct reading. apparently it reads PPR which according to the info is the number of times the coil fires per revolution of the crankshaft.

So guru's with a 4 cylinder pinto how many times would a points type distributor coil fire per rev of the crankshaft.

I need this info to get the reading right and the more I think about it the more confused I'm making myself(logic tells me that the coil will fire once per cylinder, but how many cylinders fire per 1 rev of the crank?)

Cheers all, confused as ever but why change a habit of a lifetime

Nigel

2

its a 4 stroke - so each cylinder sparks every second rotation of the crank

4 cylinders => one spark every stroke

so 2 sparks per rev

(edit: damm to slow again, good to see Mr Wippy back on form )

[Edited on 26/5/09 by mcerd1]

many thanks, it's one of those things that you more you think about the more different answers you come up with.

cheers again

Zener diodes as per the Autosportlabs site
Rescued attachment Tach_circuit.jpg