Simon TR4a
Jedi Knight
Offline
I had noticed the car running on a bit after turning off the ignition, so felt it was time for a tune up, carb adjustment, plugs, air cleaners etc.
I took out the plugs, which looked a little rich on the two front cylinders, but about right on the back, and found they were NGK BPR6HS. Why I would use resistor plugs when I have no radio in the car I cannot imagine, but anyway, I changed them for a set of B7HS, on the theory that the cooler heat range and shorter centre electrode and insulator would solve the problem. (I had filled up recently with 91 octane instead of the 94 octane I usually use, and this may also have contributed to the problem.)
The plastic container I use to store feeler gauges, used distributor rotors and such also had a variety of used spark plugs- Champion L87Y and L82YC, and various NGK, including some weird long reach plugs which may have been for the Spitfire when we had that. For a while I had been using an electric fuel pump and Holley pressure regulator, and had not been able to get consistent mixture, so had done a lot of plug readings and since they were almost new, I kept the plugs.
So I am interested in what plugs you have found work well, particularly with some performance upgrades?
I took out the plugs, which looked a little rich on the two front cylinders, but about right on the back, and found they were NGK BPR6HS. Why I would use resistor plugs when I have no radio in the car I cannot imagine, but anyway, I changed them for a set of B7HS, on the theory that the cooler heat range and shorter centre electrode and insulator would solve the problem. (I had filled up recently with 91 octane instead of the 94 octane I usually use, and this may also have contributed to the problem.)
The plastic container I use to store feeler gauges, used distributor rotors and such also had a variety of used spark plugs- Champion L87Y and L82YC, and various NGK, including some weird long reach plugs which may have been for the Spitfire when we had that. For a while I had been using an electric fuel pump and Holley pressure regulator, and had not been able to get consistent mixture, so had done a lot of plug readings and since they were almost new, I kept the plugs.
So I am interested in what plugs you have found work well, particularly with some performance upgrades?