From: Chris Reinhardt <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: [F500] Help I don't know what to do anymore
Date: Wed, 27 Sep 2006 20:07:19 -0700 (PDT)
Hmm, the gravity thing... Chuck I'm a welder, and cerified in overhead,
if your theory was correct, I could only weld with the electrode pointing
down... You can weld an electrode at any attitude, if it can jump a
spark, have enough current, it can weld.
Well the loose rod will tell the story, but if not I would shotgun the
whole ignition system. Hey just a thought, anyway that an engine builder
down the road stuffed a longer rod on 1 side? If it were a factory f$%#
up, like .020" or so, you probably wouldn't know by the looks of it...
I assume these are battery fired ignitions and not mag? Another
theory I've seen in the old Triumph bikes. If the voltage to the coils
goes A/C it will drive the spark timing nuts. I know, why is it just the
one cylinder, I could see a whole barage of bad wiring.
There's obviously something different from the good cylinder to bad,
either mechanical or electrical.
John, keep it simple. Check the cylinder/piston for damage, check
compression on both cylinders, when you get it running again, check timing
left to right.
CR
Chuck Voboril <[EMAIL PROTECTED]> wrote:
John said:
"I have seen electrodes bent/welded, and severely burnt."
So, the question now is whether or not the bending you see is responsible
for closing the gap enough to burn things also.
Or is the bending the result of melting?
The ground electrode is upside down in the cylinder, so having it melt and
bend upwards against gravity sounds impossible.
Is it just the center electrode?
That would have to still flow uphill even to go to one side of th eplug.
Gravity still exists.
Still sounds like a rod with a lot of clearance or debris in the chamber.
This may be a chicken or egg situation.
It could be that the one cylinder with higher compression is the one
suffers
most due to always overly advanced timing.
When any motor gets hot it is less tolerant of too much advance.
I would not move my CDI unless you want to risk trouble with it running
even
worst due to excessive inductance problems. As an electrical engineer, I
would not recommend lenthening these leads more than a few inches.
I have run these ignitions and coils in AZ for 12 years always in the
factory locations at outside temps of over 116 degrees.
Never had a hint ever of an ignition problem. These are dirt simple little
units with no microprocessor and about 2 transistors in the CDI box.
Coiuld probably tolerate an A-bomb going off nearby.
There is always the small chance that you do have one that malfunctions
when
hot, but I have trouble seeing it able to put out more energy or more
advance !!!
I suppose that anything is posibble.
But you would be covering up a bad unit if you kept it cold all the time.
They don't need to kept cold if they are OK.
Chuck
>From: "John Vriesinga"
>Reply-To: [email protected]
>To:
>Subject: Re: [F500] Help I don't know what to do anymore
>Date: Wed, 27 Sep 2006 16:44:18 -0400
>
>>Richard, it is not clear what the story is with the electrodes, ground
>>smashed against center or center melted. I wish that John could send
>>some
>
>On different occassions, but always on the same cylinder, I have seen
>electrodes bent/welded, and severely burnt.
>
>>pictures or describe more fully
>>
>>Any sort of detonation or overly advanced timing would pretty much have
to
>>show specks on the porcelin, even if run only for a short time. No
>>feedback from John on that yet.
>
>I haven't been out to look at that yet Chuck. I need to find a
magnifying
>glass.
>
>
>>It seems like it would take a really really long hard pull to melt a
plug
>>down in a Solo event, but I could be wrong.
>
>Our average track time is about 50 sec. so there are no long hard pulls.
>
>>He has not said he is turning it back and forth like you describe, but
>>going in one direction.
>
>I am rocking the engine back and forth by hand, and it feels as though
>there is a lot of slop inside. I hope in the next few days to be able to
>get out and work on it. Been a bit sick lately.
>
>Thanks for your help guys.
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