Anybody used an Oscilloscope on the 3rd Gen?
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DinoDude
Joined: Feb 2002
Posts: 1,170
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From: Harpers Ferry, West Virginia
Anybody used an Oscilloscope on the 3rd Gen?
I set out today to try to see the effect of the Twinpower and hooked up a Fluke 98 Scopemeter to try to get secondary ignition tracings with and without the Twinpower attached.
It did not go well. I was able to get the classic secondary ignition tracing on one leading plug with a very messy spark line, a very messy & garbled tracing on the other leading plug, and nothing sensible on the two trailings.
Anybody around here ever used oscilloscope on a rotary? What am I doing wrong?
It did not go well. I was able to get the classic secondary ignition tracing on one leading plug with a very messy spark line, a very messy & garbled tracing on the other leading plug, and nothing sensible on the two trailings.
Anybody around here ever used oscilloscope on a rotary? What am I doing wrong?
Last edited by tcb100; Apr 12, 2005 at 04:41 PM.
Rotary Freak
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From: Slovenia, Europe
Originally Posted by Bluem
i had a few pictures , from one on a fd with a two broken apex seals and the housings were made crap , thre really good to check apex seals and rotor housings
Rotary Enthusiast
Joined: Oct 2001
Posts: 1,022
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From: Ontario, Canada
I've been doing some testing of FC ignition components, and have snapped pics of a number of traces. I've been probing the ecu signal wires, and coil -ve terminal for most work, although I just added current measuring capability as well, which clearly shows the current limiting kick in after 1.6ms or so.
For more info, the test results are being posted here:
http://www.msefi.com/viewtopic.php?t=7544
Roger.
For more info, the test results are being posted here:
http://www.msefi.com/viewtopic.php?t=7544
Roger.
Joined: Mar 2005
Posts: 231
Likes: 0
From: Californian refugee taking shelter in Texas
Originally Posted by tcb100
I set out today to try to see the effect of the Twinpower and hooked up a Fluke 98 Scopemeter to try to get secondary ignition tracings with and without the Twinpower attached.
It did not go well. I was able to get the classic secondary ignition tracing on one leading plug with a very messy spark line, a very messy & garbled tracing on the other leading plug, and nothing sensible on the two trailings.
Anybody around here ever used oscilloscope on a rotary? What am I doing wrong?
It did not go well. I was able to get the classic secondary ignition tracing on one leading plug with a very messy spark line, a very messy & garbled tracing on the other leading plug, and nothing sensible on the two trailings.
Anybody around here ever used oscilloscope on a rotary? What am I doing wrong?
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DinoDude
Joined: Feb 2002
Posts: 1,170
Likes: 0
From: Harpers Ferry, West Virginia
There was not a lot to the hookup so I don't think that was the problem, a line to ground and an inductive clamp on the spark leads.
That did give me one proper looking secondary ignition tracing through the spark line just bounced all over the place. The Scope meter kept reading twice my actual RMP. I tried about every combination I could think of 1 cylinder through 8 cylinder, 2 cycle, 4 cycle. The trailing traces were just gibberish. No firing line to speak of no spark line to speak of, no kick at the end - zero, nada.
Is the Fluke known for this problem? Do you have to tell it anything special for a rotary? I have access to a Sun machine and I am going to try that next. I am also going to attach the clamp way down on the sparkplugs from under the car rather than closer to the coils than the plugs. Maybe I was picking up signal from adjacent wires?
That did give me one proper looking secondary ignition tracing through the spark line just bounced all over the place. The Scope meter kept reading twice my actual RMP. I tried about every combination I could think of 1 cylinder through 8 cylinder, 2 cycle, 4 cycle. The trailing traces were just gibberish. No firing line to speak of no spark line to speak of, no kick at the end - zero, nada.
Is the Fluke known for this problem? Do you have to tell it anything special for a rotary? I have access to a Sun machine and I am going to try that next. I am also going to attach the clamp way down on the sparkplugs from under the car rather than closer to the coils than the plugs. Maybe I was picking up signal from adjacent wires?
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