Top speed 164 S

[C M Smith <cmsmith@domain.elided>]

The shop manual specifies 23.03 mph in top gear for the S (25.62 mph for 
the L) which is 6,382 rpm at 147 mph. This is the redline for the S. Peak 
power is developed at 5,800 rpm (200 hp for the S, 183 for the L at 5,600 
rpm).

The other speedo error factor which is difficult to allow for is tire 
growth at high speeds. The centrifugal "force" causes the circumference of 
the tire to grow as the speeds get very high, each tire is different in 
this regard. Standard speedo testing probably wouldn't give you this 
number, but the tachometer will show actual engine rpm which can be used to 
calculate speedo error. However, tire growth actually represents real 
circumference changes so the calculated speed from the tacho is probably 
affected the other direction now that I think about it!!

Anyhoo, 147 seems eminently achievable with a 200 hp engine 500 rpm beyond 
its peak power.


Michael Smith
Calgary, Alberta
Canada
91 Alfa 164L, White, original owner

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