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nelson plug

Post  chevyiron420 on Thu Feb 12, 2015 11:11 pm

I have been experimenting with a galbreath head and nelson plug. I am having trouble with it. The engine runs like its rich, 4 stroking. If I lean it out any it shuts off. The head is sealing good on the shim. Could the HD plug be too cold? The engine runs great with a stock glow head. DAMMIT!
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Re: nelson plug

Post  Mark Boesen on Thu Feb 12, 2015 11:19 pm

what % nitro? and how many gaskets?
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Re: nelson plug

Post  chevyiron420 on Fri Feb 13, 2015 12:44 am

20% nitro and one gasket.
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Re: nelson plug

Post  Surfer_kris on Fri Feb 13, 2015 8:00 am

Sounds like a too cold plug and/or too low compression ratio for the fuel used.

I haven't used the Galbreth head enough myself, but there are other Nelson plugs to try with too. Merlin makes a few for instance, including a Glow Bee style.
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Re: nelson plug

Post  crankbndr on Fri Feb 13, 2015 8:24 am

With that combo I've always had to run 3,4,5 gaskets on 25%, the Mouse I sent to Kim had 5.
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Re: nelson plug

Post  Mark Boesen on Fri Feb 13, 2015 9:03 am

I'd add 2-3 gaskets, 3-4 total and see what happens? With the present set up can you needle it? Usually when its over compressed it's almost impossible to needle and that sounds like whats happening.
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