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Shift change photo

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124HP from what, 80? That's pretty steep. How did they deal with detonation with the poor gas and carburetors of the time?
"Claimed"


McCulloch advertising of the period claimed a 38% increase in Horsepower, better gas mileage, smoother performance and a longer engine life. More than 5,000 of the superchargers were sold during the late 30’s, but production was discontinued during the early 1940’s due to two reasons. The impeller for the supercharger, being gear driven, and being lubricated via the engine oil system which was often not changed as regularly as it should, had a tendency to become quite noisy with wear, and the blower, due to its fixed ratio of 6:1, produced no significant boost until high rpm was being achieved by the engine with boost levels being no more than 4 psi, even with radical reworking. These facts failed to impress the general public, and sales were low

4psi of boost at high RPM's probably wasn't enough to make detonation an issue.
 
"Claimed"



4psi of boost at high RPM's probably wasn't enough to make detonation an issue.


And most of that sort of stuff was being sold in the 60s after gas had gotten good but before the flathead based hothrods were gone so the overall compression ratio after accounting boost was probably in the same ballpark as the OHV shit that was rolling off the line at the time.

I bet 4PSI was a huge fucking help though. The flow path through a flathead is not great. :laughing:
 
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