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Question for Clooney or anyone else in the know

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BJ

04-29-2003 19:19:46




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Recently I was having ignition trouble with the pony on my 830 and thought I might have had fouled plugs so I pulled the champions and tried replacing them with AC R45 plugs and could not use them due to not having enough clearance between one plug and the power steering unit in my trials I found that the AC R45S plugs have an extended tip and thus a shorter insulator (more clearance) and I was wondering if you see any problems with using these plugs i.e. is there enough clearance internally on the engine to worry about anything according to my parts guy he claims the extended tip makes them a little less prone to fouling or should I go back to the Champions btw after some trial and error I found my misfiring problem to be a bad condensor

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Clooney

04-30-2003 06:16:16




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 Re: Question for Clooney or anyone else in the know in reply to BJ, 04-29-2003 19:19:46  
BJ, you can use the 45 plug but I don't recommend the [S] extended tip as that puts the ignition point closer to those fragile aluminum pistons. I really don�t know if it would hurt or not but you don�t want to take a chance with those expensive pony pistons.
~I don't recommend the R [resistor] plugs either as that puts a resistor in the secondary ignition circuit & while that won't effect the KV required to jump the plug gap it will shorten the spark duration due to the resistor cutting the spark off early.
~While the extended plugs can [not always though] burn a little cleaner if the tip is in the fire farther it really doesn't effect the heat range as heat range is heat range. The extended tip is taken into account when the heat range is figured.
~The best plugs I have found for those pony engines is the Champion J-8C. That is a copper plug & resists fouling better.

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John T

04-29-2003 20:41:03




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 Re: Question for Clooney or anyone else in the know in reply to BJ, 04-29-2003 19:19:46  
Good evening BJ, I do not have any plug spec or dimension charts so I can't comment on the reach of the plugs you mentioned. It is generally true, however, that those deep reach (long tips) in the combustion chamber plugs can be less prone to fouling, as they run at a higher temperature (a so called hotter plug) and therefore burn off deposits better. If they run too hot though, they might create a hot spot and cause pre ignition or even burn something. Sooooo ooo, you have to first be sure the plug does not physically interfere with any piston or valve travel, and second its not so close (even if it doesnt hit anything) it might burn something.

As you found, a weak or leaky or especially a shorting condensor can give ignition problems and/or cause premature point burn up. Glad you got her diagnosed.

Just be first sure the plugs dont physically interfere with anything, and as far as too hot to cause harmful pre ignition or hot spots etc., I cant answer that but be careful. I would recommend you stay with a plug of the same basic reach and dimensions (same series) but which is just a heat range or 2 above the ones you have. That way theres less chance of any overheatign or hot spots or pre ignition etc than with an unknown plug.

Let us know.

John T Nordhoff in Indiana

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