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" <[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 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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