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Austinsevenfriends
Spark Plugs again - Printable Version

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Spark Plugs again - bob46320 - 26-06-2021

What are the current thoughts on 18mm plugs for the 1932 RN (Low compression head).  With changes in fuel composition are NGK A6, Champion B16 plugs still the best ?  After a long run, the electrodes are clean and creamy white, but the foot of the threaded section is lightly sooty.  I have found that running on the 98 (premium petrol) reduces vaporisation and the engine runs better.

RE: Spark Plugs again - Dave Mann - 27-06-2021

I treat spark plugs as fit and forget, our RNs run champion D16.

RE: Spark Plugs again - bob46320 - 30-06-2021

Thanks for that Dave. 
So do we think that changes in fuel from Leaded to Un leaded to Bio fuel and who knows what wouldn't need any changes to fuel ignition ??
Bob

RE: Spark Plugs again - Ruairidh Dunford - 30-06-2021

I changed to D21s a number of years ago, the cars seem to run much better on them.

RE: Spark Plugs again - Ivor Hawkins - 01-07-2021

My pal has an MG 18/80 and fitted new NGK spark plugs as part of an engine overhaul and it refused to run on all six. After messing around with points, condensers and all the usual faff, he raked through a box of old Champion plugs, all of which were at least 70 years old, after fitting the car runs perfectly on new petrol.

Exactly the same happened with a pal’s Norton dominator...old Champions transformed the bike, it just didn’t run right in new NGKs...we are now trying to find the NGK boxes to see if they are counterfeit plugs.

RE: Spark Plugs again - Ray White - 01-07-2021

(01-07-2021, 01:59 PM)Ivor Hawkins Wrote: My pal has an MG 18/80 and fitted new NGK spark plugs as part of an engine overhaul and it refused to run on all six. After messing around with points, condensers and all the usual faff, he raked through a box of old Champion plugs, all of which were at least 70 years old, after fitting the car runs perfectly on new petrol.

Exactly the same happened with a pal’s Norton dominator...old Champions transformed the bike, it just didn’t run right in new NGKs...we are now trying to find the NGK boxes to see if they are counterfeit plugs.

Either counterfeit ... or made in China.  (You take your chances if buying off eBay).

RE: Spark Plugs again - flywheel1935 - 01-07-2021

Changed from NGK to Champion, and Ruby runs loads better, BUT did a few other jobs as well, such as timing and e-ignition, so could be plugs !!!!

RE: Spark Plugs again - Tony Press - 02-07-2021

If you ask Mrs Google about:

'fake vs real ngk spark plugs'

Threr are a number of stories  Huh

RE: Spark Plugs again - Parazine - 02-07-2021

This is a good guide:

https://www.slideshare.net/athangal/distinguishing-fake-ngk-spark-plug

RE: Spark Plugs again - andrew34ruby - 03-07-2021

(30-06-2021, 02:16 PM)Ruairidh Dunford Wrote: I changed to D21s a number of years ago, the cars seem to run much better on them.

My Ruby is fitted with Champion D16 plugs. What differences might I notice if changed to D21s?