Suggestions on which plugs to go with
Of course ignorance personified in post #37 & the ignorance just keeps coming.....
I have done a LOT of spark plug testing because ign is a subject that has fascinated me. You will get idiotic statements as in post #37; another favourite is spark plugs do not make a hp difference......
Thank goodness some smart people thought otherwise....or else we would still be using the 18mm two piece plugs that my 1938 Knucklehead had....
Example. I tried the then new Bosch plugs a few years back that had 4 grd electrodes. I got surging at about 35 mph. Hmm. I only changed the plugs. Re-fitted the trusty NGKs. No surging [which is misfiring....causing power loss....& increased fuel consumption ]. WTF? I cut off two of the grd electrodes on the Bosch plugs & re-tried them. No surging now.....that I could feel. However, I was worried that I could be getting misfiring & not feeling it [ sometimes hard to feel with big engines ]. Just one example.
Below is another example, an extreme example, but it shows how much hp can be lost just due to the wrong spark plugs [ too cold ]. In this case, 33% hp loss.
Of course ignorance personified in post #37 & the ignorance just keeps coming.....
I have done a LOT of spark plug testing because ign is a subject that has fascinated me. You will get idiotic statements as in post #37; another favourite is spark plugs do not make a hp difference......
Thank goodness some smart people thought otherwise....or else we would still be using the 18mm two piece plugs that my 1938 Knucklehead had....
Example. I tried the then new Bosch plugs a few years back that had 4 grd electrodes. I got surging at about 35 mph. Hmm. I only changed the plugs. Re-fitted the trusty NGKs. No surging [which is misfiring....causing power loss....& increased fuel consumption ]. WTF? I cut off two of the grd electrodes on the Bosch plugs & re-tried them. No surging now.....that I could feel. However, I was worried that I could be getting misfiring & not feeling it [ sometimes hard to feel with big engines ]. Just one example.
Below is another example, an extreme example, but it shows how much hp can be lost just due to the wrong spark plugs [ too cold ]. In this case, 33% hp loss.