thepest
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| posted on 2/10/09 at 02:19 PM |
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Spark Plug choice
I'm running a x-flow with 10.2:1 compression.
My current plug is a BP8ES it seems to run cold as the plug is dark coloured (blackish) but the Lambda readout of the mixture is correct 14:1.. is
there a guide as to what type of plug to use or is it trial & error?
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philtvr
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| posted on 2/10/09 at 02:37 PM |
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try
http://www.ngk.de/Spark_plugs.649.0.html
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MikeRJ
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| posted on 2/10/09 at 04:37 PM |
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An NGK '8 'is a very cold running running plug, unless your engine is in a fairly high state of tune this will almost certainly be too
cold.
As a guide the standard grade for the Kent is BP6ES, and Caterham used BP7ES on their 1600 106bhp Kent engines.
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thepest
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| posted on 2/10/09 at 05:41 PM |
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well a 244 cam is running in this engine, what state of tune would that make it?
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britishtrident
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| posted on 2/10/09 at 06:46 PM |
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Black deposit is probably caused by oil however BP8ES is a cold plug for an Xflo I would try BP7ES
BP8ES = Champion N6Yc
BP7ES = Champion N7YC or N8YCc
BP6ES=Champion N9YC
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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thepest
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| posted on 3/10/09 at 06:52 AM |
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It doesn't look like oil, thanks for the plug advice will try those out 
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