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Poor starting TR3a Discuss.

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#41 Peter Cobbold

Peter Cobbold
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Posted 15 March 2016 - 01:47 PM


Just looked up the Denso Iridium spark plugs that I think will do a 4 cyl TR  -  Denso IWF20 - Just £8.00 a pop.  I am in the old world of spark plugs costing one to two pounds a set or each as it is today - Do you have road test experience of these items in a TR Peter?  Should we now be ditching our NGK BP6HS (TR2-4A) and NGK BP6ES (TR5-6 PI) ?





Peter W


No experience yet, they're sitting on the shelf. My aim is to run really lean at cruise and not to suffer weak sparks under boost: wire plugs should do both. I am always wary of sales blurb but wire plugs are based on sound data, in textbooks and publications. eg thsi on ignting lean mixtures:


So they should help starting. The carb may be richended but only a small fraction of petrol will vapourise in a cold engine, so the mixture at the plug will be lean.


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