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What spark Plug do use in my Johnson 1930 V45 26hp motor?
chuck86 doggone@velocity.net
Chuck, Hunn,s Book 3rd. addition in bacl has a list K45 ,Champion R7 no crossover I see.
18mm spark plug heat range chart … Hottest on top, Coldest on bottom
Champion – – – AC – – – Autolite – Bosh – Motorcraft Prestolite C7 (D23) – – – – – – C15(D21) – – – C88 – – – – – – – – – – BT9 7 (D16) – – – C87 – – – – – – – – – – B8X 6M (D14) – – – C85 – – – 386 5M (D9) – – – C82 – – – 373 – – M8A – — – BT4 – – – 18-3 R7 (D6) – – – – – – 372 – – M7A R1 R11 R11S Old racers using Alcohol R2 R2S Using Nitromethane.
Prepare to be boarded!
I am running D 9 in the upper three and a D14 in # 4 of my V45 The vacturi carb runns a little leaner My fuel is 91 octaine alchol free 2and1/2 gal to one pt of TCW 3 and 1 QT 50 wt non detergent plugs are chocklate run e’m and check e’m
The Champion D9’s are the norm but I run NGK AB6 in mine and in all my P,S,V and PO’s and in my speeditwins, they seem to like them better😉
Rotary valve Johnson’s Rule!