how many cyl do you set a tach to on a rotary??
#1
Flinstone Power
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how many cyl do you set a tach to on a rotary??
i just bought this http://cgi.ebay.com/ebaymotors/ws/eB...tem=1876195578
and was wondering how i set it for a rotary.. thanks
Dave
and was wondering how i set it for a rotary.. thanks
Dave
#4
Rotary Freak
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Yeah, if you go off the leading coils. The trailing coils fire half as many times (each) as does the leading (twin outlet) coil. So, the leading reads like a 4-cyl, while the trailing reads like a 2-cylinder. I think the factory tach reads off the trailing coils, though.
Ren
Ren
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#8
I wish I was driving!
If you take your tach input from the trailing coils, you set it at 4 cylinder (stock tach runs off this input, and I believe a connector is already ready to connect).
You can wire it into the negative signal from the leading coil, but if so, you must set it as an 8 cylinder,.
You can wire it into the negative signal from the leading coil, but if so, you must set it as an 8 cylinder,.
#9
I wish I was driving!
Originally posted by fastrotaries
but you go off the trailing to set up a tach or a tach light.
but you go off the trailing to set up a tach or a tach light.
#10
I wish I was driving!
Originally posted by turboren
Yeah, if you go off the leading coils. The trailing coils fire half as many times (each) as does the leading (twin outlet) coil. So, the leading reads like a 4-cyl, while the trailing reads like a 2-cylinder. I think the factory tach reads off the trailing coils, though.
Ren
Yeah, if you go off the leading coils. The trailing coils fire half as many times (each) as does the leading (twin outlet) coil. So, the leading reads like a 4-cyl, while the trailing reads like a 2-cylinder. I think the factory tach reads off the trailing coils, though.
Ren
The trailing coils fire twice each for every two revolutions, so it would read as a four cylinder, not a 2 cylinder.
#11
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I did say I think. Since I haven't seen my FC's in over a year, I can't remember for sure. I knew the leading coil fired twice as often as the trailing, and that there is a wire on the trailing for the tack hookup, I just couldn't remember what it was set up to read.
Ren
Ren