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The Marston Sunbeam Club & Register Forum

General Category => Beamers General Discussion Forum => Topic started by: hennie.nijhuis on October 12, 2021, 02:30:58 PM

Title: Use of Spark plugs Model 9 - no long reach M18 - 3/4 as standard
Post by: hennie.nijhuis on October 12, 2021, 02:30:58 PM
According to an engineer of the green spark plug company Sunbeam supplied the Model 9 engine with a Champion D9 18mm 1/2 inch reach spark plug

reason beeing that the shorter plug in a longer 3/4 hole would prevent fouling of the plug....

feel free to react on this.

greetings, Hennie
Title: Re: Use of Spark plugs Model 9 - no long reach M18 - 3/4 as standard
Post by: Ken the Sec on December 01, 2021, 04:21:26 PM
Was that just because they don't have any long reach plugs in stock?

I have tried both in my Lion 600 and so far can see little difference in performance.  I was hoping the long reach plug might improve the tickover that is sometimes a little difficult to tune.
Title: Re: Use of Spark plugs Model 9 - no long reach M18 - 3/4 as standard
Post by: hennie.nijhuis on December 02, 2021, 01:53:06 PM
The Long reach 18mm plugs are like rocking horse manure....
Title: Re: Use of Spark plugs Model 9 - no long reach M18 - 3/4 as standard
Post by: wessex_man on January 31, 2022, 07:08:46 PM
Personally I prefer the 3/4 long reach, and agree with the article in last Beaming. Better flame propargation, especially when using a more sporting setup.
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