Berkshire SL5 7JX
Saturday 2 October 2010 at 3pm
The S boasted modifications typical of a higher-performance Porsche: reprofiled cam, larger valves, better porting, loftier compression (9.8:1 vs. 9.0), larger jets for the Weber carbs (which were otherwise much like those given to the base 911 from early ‘66).
The result was 30 more horsepower for a total 180 horsepower and torque improved fractionally, to 127 pound-feet, but peaked fully 1,000 rpm higher.
Unlike other models, the S lacked a choke, but pumping the accelerator was usually enough for starting. On the other hand, merely blipping the throttle on the freer-breathing S would send the tach needle zinging to its 7,300 rpm redline. Porsche thus wisely fitted an ignition cutout that interrupted spark to the plugs near maximum revs, thus protecting the valvetrain from overly enthusiastic drivers.
Naturally, the S also received chassis upgrades to match its extra power. These included a rear anti-roll