FAO Electrical boffins.

[Dancliovalver]

Now i dont really inderstand a word of this, we have a genius electrical person at work and he has sort of told me what to put here.

Basically, he wants to know the maxium wave form a 172 engine will put out and also the wav form going into the rev counter?

Hes pretty sure he will be able to get a Rev counter working on the 172 engined valvers but he needs to know the maxium pulse from the coil pack and so forth.

it really makes no sence what so ever to me, but im hoping some of you guys mite now :D

[geesus]

why is it that these things crop up AFTER i have spent money getting round the problem? lmao

people have got the rev counter to work, but it under reads by half due to the difference in pulses? iirc

i presume your man knows a piece of kit that can get round this?

my aftermarket digital tacho has a setup function for 2,4,6,8 cylinder engines, because i was taking only one signal from the dual pulse coil if i set it to 4 cylinder engine it would under read by half, but then set it to 2 cylinder and it reads fine. tells you in the instructions for it to do this on some engines that use a dual pulse coil pack

i dont understand electrics in any way, but i can't see why you can't rig up both coil signals to the rev counter and get it to read correctly? waaaay beyond knowledge though

[Dancliovalver]

well hes on about designing a little in-line circuit board which converts the pulse and so forth, hes an absolute genius, hes ortistic (sp), he cant read or write but he has a masters degree in electronics, hes very very clever so im hoping he will be able to come up with something :D

[Dancliovalver]

do u know how the guys managed to get the rev counter to work mate? maybe my man could make something which makes the rev counter read correctly after that?

really sorry i dont know anything about electronics eaither, its gobbledy gook to me

[Dancliovalver]

another question for you boys and girls

can anybody tell me the frequency of the pulse please?

[white16valver]

Will the frequency of the pulse rise in line with the revs?

This is a total guess by the way LOL

[Dancliovalver]

not a clue buddy, but thanks for the guess

any more takers

[Purple]

people have got the rev counter to work, but it under reads by half due to the difference in pulses? iirc

Dancliovalver,
Well, if it under-reads consistently by half throughout the rev range, I would then think a 2x clock multiplier circuit would do the trick. I think that all the info he needs, aside from the voltage values (probably 0V - 5V).

[Dancliovalver]

kool kool, thank you very much

we hoping thats gunna be the easy way to do it, but just looking at other options incase that fails

secondly, which wire on the coil pack takes the pulse? its on a 172 coil pack buy the way :D

[Purple]

secondly, which wire on the coil pack takes the pulse? its on a 17poo coil pack buy the way :D

Sorry, not a clue there. Someone else should know that.