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Re: Yet another no start - new symptom

D

Dell (WA)

Well-known Member
Paul.......you do know the WIDER the sparkie gap, the MORE kilovolts it takes to jump the gap, don't you? The weird 4-nipple front mount dizzy really doesn't have many kilovolts to spare. Keep yer sparkie gap at 0.025". 70psi compression on a DRY test ain't braggin' rights. Ford specs: 90psi MIN, most good runnin' N's test about 110psi. Brand NEW overhauled N-Engines test about 125psi.

1-cylinder low compression will cause VIBRATION. Sometimes in COLD weather, you need to warm the carb. Try wrappin' some aluminum foil around carbie and exhaust manifold. (be creative) .......the COLD Dell
 
Here's mine on Old Smokey. Yet she runs:

OLD SMOKEY COMPRESSION TEST

April 7, 2011



DRY WET

#1 110 120

#2 70 90

#3 60 80

#4 110 120
 
You can greatly improve a fouling plug by
either installing a antifouler plug extension
or by tying a piece of wire around the porcelin
part of the plug about 1/4" away from the
contact tip of the plug and then tie the other
end of the wire to the plug wire. That will
make the spark have to jump the gap between the
wire and the plug greatly increasing the sparks
power intensity.
Don't ask me how it works but it sure does.
I've known this trick ever since my 1938 worn
out Ford four door car when I was 16 that I
carried around a five gallon bucket of used oil
just to keep riding!!!! :O)

Zane
 
On my 6v 9n,to check the firing of the plug wires,I
use a 12v motorcycle battery and a timing
light,clamp type. It's fairly simple to check the
wires that way.
 
Dell -- I don't think I wrote what I meant clearly enough! I only tested the spark with an opened up plug (as is often recommended here). I didn't try to run it like that. The sparkies that went into the engine were all gapped to 0.025". Or thereabouts--I used one of those disk-type gauges, so that might be +/- 0.005. I need to redo it with a proper feeler gauge.

I know 70 is low. This engine has been at 90 since I got it, which I also know is not great. I'm presuming that 70 on #1 means there's something wrong, probably rings.

Thanks for suggesting that low compression on one cylinder can result in vibration. Hopefully that means there isn't something else wrong...

-Paul
 
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