Re: Mike's 53 Clipper
Posted by Tobs On 2017/11/3 4:14:58
After driving for a while with .031" spark plug gaps, I went to .035" gap. That's the spec for the V8 engines with 12 Volt systems. I might be fooling myslef, but it seems peppier. I really can't say for sure. Changing the spark plug from .028 to .035 changes the voltage required for creating a spark from 11kV to 15kV according to the Bosch literature I have...Increasing the gap however reduces the length of time that the spark is actually sparking in the plug...
One other thing I would like to experiment with is changing my ACR45 plugs to the NGK equivalent BR6S, or BP6S. The BR6S is the same as ACR45 or Autolite A308 from the size, but seems to have a wider heat range...The BP6S is a projected tip plug which puts the electrode 0.100" deeper into the combustion chamber. Of course I will check clearances to the valves before running the projected tip plugs.
Has anybody looked into these plugs for a flathead before?
Attached is a pic showing the 2 NGK plugs.
I calculated my fuel consumption, and got a average of 12 MPG over the last 2 tanks of fuel. That was with quite a bit of city driving and traffic going to and from work. I guess that is reasonable for in-town MPGs.
Attach file:
(79.49 KB)
One other thing I would like to experiment with is changing my ACR45 plugs to the NGK equivalent BR6S, or BP6S. The BR6S is the same as ACR45 or Autolite A308 from the size, but seems to have a wider heat range...The BP6S is a projected tip plug which puts the electrode 0.100" deeper into the combustion chamber. Of course I will check clearances to the valves before running the projected tip plugs.
Has anybody looked into these plugs for a flathead before?
Attached is a pic showing the 2 NGK plugs.
I calculated my fuel consumption, and got a average of 12 MPG over the last 2 tanks of fuel. That was with quite a bit of city driving and traffic going to and from work. I guess that is reasonable for in-town MPGs.
Attach file:
(79.49 KB)
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