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Old 03-19-2010, 07:43 PM   #1
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Default glow plug question

I am having trouble starting a .28 Ofna motor I was needing to know do you use both the shims they give you with the glow plug or just one. And if both shims is used would it cause the motor not to start
Thanks for any and all replies?
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Old 03-19-2010, 08:49 PM   #2
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Using both shims would not cause the engine to not start.
Were both shims already installed or no? What percentage nitro are you running? I'm not very familiar with that particular engine, but you would run the thicker shim with 20-25% nitro, and if you run 30% you would add the extra shim. The heat range of the glow plug will play a role too, but a medium plug in that engine should be fine.

The extra shim will decrease the compression. Sort of the same way a 1/1 engine uses lower compression when using boost. In our case we lower compression when raising nitro content
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Old 03-20-2010, 12:11 AM   #3
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Quote:
Originally Posted by boomgagem View Post
Using both shims would not cause the engine to not start.
Were both shims already installed or no? What percentage nitro are you running? I'm not very familiar with that particular engine, but you would run the thicker shim with 20-25% nitro, and if you run 30% you would add the extra shim. The heat range of the glow plug will play a role too, but a medium plug in that engine should be fine.

The extra shim will decrease the compression. Sort of the same way a 1/1 engine uses lower compression when using boost. In our case we lower compression when raising nitro content
20% and myself Im not familar with the engine Im just trying to get it started for a friend of mine its a pull start also I fill the low needle is at a wrong setting wants to hit then dies out also the glow ignitor is one of those D-cell type I fill that it is glow plug and ignitor problem Im just questioning the double shim Ive not seen that when using the ignitor on the plug to see if it is glowing it takes to long to get to the cherry red stage. Far as the low end needle i had to lean it just to get it to hit for the first time. And also yes I am preheating and doing everything else pretty much by the book.
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Old 03-20-2010, 01:43 AM   #4
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If you are referring to the two washer on the glow plug. Yes use them both.
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Old 03-20-2010, 04:03 AM   #5
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If you are referring to the two washer on the glow plug. Yes use them both.
Yes and thank you realy wasnt sure that threw me off a lil bit today seen one but not two before
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Old 03-20-2010, 03:16 PM   #6
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I've N-E-V-E-R heard of two (copper washers, if that's whay you meen) on a glow plug!!
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Old 03-21-2010, 04:24 PM   #7
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Found the problem actualy two problems first major problem was the line had a slight nick in it and the second was the glow ignitor was a D cell in my oppinion didnt work as well as a higher end or a rechargable glow ignitor
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