Inductive hour meter..can it cause low spark?

Jasle

Sponsoring Member

Nov 27, 2001

1,358

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• Nov 9, 2007

• #1

Ok basically like it says. I'm talking to a guy about his hour meter causing jetting problems. I'm struggline to wrap my head around how 4-5 loops of wire around the spark plug wire is enough of a drain that the jetting gets more touchy and starts having problems. Admittedly the problem did not go away after removing the hour meter but the guy is adamant that he had the same problem before and cured it by removing the hour meter then the problem came back the second time he installed the meter but did not go away when he removed it.
Am I just crazy thinking that the hour meter is not enough of a draw to cause problems?

 

C

Chili

Lifetime Sponsor - Photog Moderator

Apr 9, 2002

8,062

17

• Nov 9, 2007

• #2

Wish I knew the answer but I can't see it, your likely dealing with the same guy who has a thread about this on another forum for his sons 65.

 

truespode

Moderator / Wheelie King

Jun 30, 1999

7,985

252

• Nov 9, 2007

• #3

I've used an hour meter on all my 4-strokes and have never had an issue with weak spark. Interesting.

Ivan

 

Z

ZOMBIE666

Member

Mar 24, 2006

324

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• Nov 13, 2007

• #4

unless the plug wire has a gash in the insulation near where he has the hour meter pickup wound, there is no way. Not only that, but the 30KV+ ignition pulses induce a very small voltage in the pickup wire, in the order of Millivolts. If the plug wire is leaking enough juice into the meter pickup to cause a noticable difference it would surely burn out the hour meter. (meter electronics looking for MV signal being fed KV ignition pulses = bad JUJU)

 

Isobareng

Member

Oct 16, 2007

139

0

• Nov 13, 2007

• #5

any wire break down that bad that wasn't lost in a carbon trail would jump to the head and would be visible at night.

 

P

Pushin50

Member

Dec 18, 2006

136

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• Nov 13, 2007

• #6

Faraday's Law relates the electric field in a coil (loops) of wire to the changing electric field in a current carrying wire near the coil. The voltage current and energy in the coil is determined by the number of turns in the coil (meter) and the rate of change of the electric field in the current carrying wire (spark wire). The rate of change in the spark wire is very high so the potential for energy loss is there.However, the number of turns of the coil is so small that almost no energy will be generated in the coil and it should have no effect on the spark energy. It would take hundreds or thousands of turns of the coil wire to draw significant energy from the spark wire.

 

E

elcamino12sec

Member

Jan 16, 2006

412

0

• Nov 14, 2007

• #7

An hour meter draws less current then a watch, so I doubt your problem is the hour meter.

 

Jasle

Sponsoring Member

Nov 27, 2001

1,358

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• Nov 14, 2007

• Thread starter
• #8

Chili said:

Wish I knew the answer but I can't see it, your likely dealing with the same guy who has a thread about this on another forum for his sons 65.

Click to expand...

Yer right...same guy. It turns out it was not the hour meter...