Author Topic: 1st I.C. build "Tiny"  (Read 36225 times)

Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #405 on: February 04, 2018, 12:43:53 AM »
Bob, I don't think you would have gotten any pops at all if it was the plug.  Why are you suspecting it? Just curious.

Bill

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #406 on: February 04, 2018, 01:06:09 AM »
Bill, I pulled the head off with the plug in it and it won't fire.  With the plug removed and grounded  directly with the wire from the ignition, it won't fire.

-Bob
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Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #407 on: February 04, 2018, 02:03:23 AM »
Somehow, the plug is shorted.  My multi meter confirms it.  Also, when I hold the plug above the head the spark alternates from the ground straps and electrode, to the head.  If I angle the plug, the spark jumps from the ground strap, not the electrode.  If I touch the ground strap to the head, nothing happens.

-Bob
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Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #408 on: February 12, 2018, 02:31:21 AM »
Sparkplug Failure Update:

As I suspected, the Corian cracked and the plug was shorted.  You can see a ring on the electrode where the crack was.  Under the microscope you can see where the electrode has been spark eroded.  When I get a chance, I am going to make a new insulator out of Teflon and reassemble the sparkplug.

-Bob
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Offline steamer

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Re: 1st I.C. build "Tiny"
« Reply #409 on: February 12, 2018, 10:49:39 AM »
Progress!     Keep the pressure on the little bugger...ot will submit eventually!
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Don1966

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Re: 1st I.C. build "Tiny"
« Reply #410 on: February 12, 2018, 02:37:32 PM »
Keep flipping those rock Bob you will win in the end. Good find bud.    :ThumbsUp:


Don

Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #411 on: February 12, 2018, 02:57:07 PM »
That should be an easy fix Bob. Just need the time to do it :)  At least you already know it runs...just not with a bad plug.

Bill

Offline cheepo45

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Re: 1st I.C. build "Tiny"
« Reply #412 on: February 12, 2018, 05:38:45 PM »
Are you trying to crimp the corian in place? I have cracked several this way. Now I make the corian a nice sliding fit and glue it all together with Loctite 262. I have several plugs that have been running in engines for 3 or 4 years that were made this way.
 Teflon never lasted very long-it tends to burn across from the center electrode to ground and short out.
Good luck with your motor. IC engines do take a while to get running properly. Don't get discouraged.

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #413 on: February 13, 2018, 01:01:50 PM »
Thanks Dave and Don.

Bill, you have that right about finding the time.  This winter has been a pain in the buttom.

Scott, I used a slight press fit for the Corian along with Permatex Old Indian Head Gasket maker to glue it.  I believe the fatal crack occurred when I pressed the electrode into the Corian.  The crack occurred at the transition from the .125 to .078 diameters.  If I had pressed the electrode from the other end, I believe the crack wouldn't have occurred.  I want to use Teflon this round because it will be less prone to cracking.  I just want to get this thing running. 


-Bob
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Online b.lindsey

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Re: 1st I.C. build "Tiny"
« Reply #414 on: February 13, 2018, 02:15:43 PM »
Bob, as you may recall I used teflon for mine and did crimp it as well. So far, after several accumulated hours of running I have not experienced what Scott mentioned. That's not to say it won't happen in time, but the teflon has worked for me so give it a try.

Bill

Offline Brian Rupnow

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Re: 1st I.C. build "Tiny"
« Reply #415 on: February 13, 2018, 03:53:28 PM »
I made a couple of spark-plugs out of Corian that someone sent me. I found it to be very brittle and crack prone.---Brian

Offline cheepo45

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Re: 1st I.C. build "Tiny"
« Reply #416 on: February 13, 2018, 05:31:07 PM »
I do tend to run my engines all day at the shows - That may be why the teflon doesn't hold up for me. It will work for a while, and it won't crack.

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #417 on: February 19, 2018, 10:26:06 PM »
Thanks for your input gentlemen.

I have zero progress to report.  I was called out a couple of times in the middle of the night during the week for icey conditions.  Saturday night we had a storm that we delt with from 7p to 3a and I worked Sunday afternoon.  I just didn't have the time or energy to make a new insulator for the spark plug. 

-Bob
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Offline zeeprogrammer

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Re: 1st I.C. build "Tiny"
« Reply #418 on: February 19, 2018, 11:23:01 PM »
I was called out a couple of times in the middle of the night during the week for icey conditions.  Saturday night we had a storm that we delt with from 7p to 3a and I worked Sunday afternoon.

Have you considered moving? Seems that weather gets in your way a lot.  ;D

But be careful where you would move to. I left tornadoes and am not sorry about that!
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline 90LX_Notch

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Re: 1st I.C. build "Tiny"
« Reply #419 on: February 19, 2018, 11:54:58 PM »
I'm only three hours north of you Carl.  It's just been a busy winter with this new job.  The entire crew can't wait for Spring. 

-Bob
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My Engine Videos on YouTube-
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