Monday, January 21, 2008

More measurements

Yesterday I was at the shop and took some more measurements. Please note that these measurements were done with a vernier caliper, and are only for general reference, they are not very precisely done.

Intake valve: 25 mm
Exhaust valve: 22 mm (21,85 to be exact)

Main crankshaft bearing: 32 mm
Big end bearing: 30 mm

Piston diameter at the skirt: 65,4 mm
Top compression ring: 0,62 mm
Piston ring diameter: 15,85 mm

Crankshaft gear: 44 teeth
Clutch boss: 86 teeth

Gearbox gears (standard OEM numbers in parentheses):
Gear:Input shaft:Output shaft:Gearing:
115 (13)31 (37)2,067 (2,846)
221 (19)35 (37)1,667 (1,947)
321 (18)29 (28)1,381 (1,555)
425 (24)31 (32)1,240 (1,333)
526 (21)30 (25)1,154 (1,190)
622 (24)24 (26)1,091 (1,083)

Bridgestone Slick 180/64 R17 circumference (sligthly used): 2,02 m

Using these numbers and putting them in my little nifty calculator (use RRlog if you don't want to do it by hand) gives a top speed of 261 km/h at the end of the Anderstorp main straight, using a 15/49 secondary gearing and running the engine at 15000 RPM.

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