At 00:17 5/24/2000, gabangs@NEWMAIL.NET wrote:
>area to check my speedo.  I've contemplated rigging up
>a temporary tach to my half-shafts to get wheel rpm.

You can paint white marks on something that rotates, then use an ordinary
fluorescent light (single tube, AC powered, *not* the "high-efficiency"
type) as a strobe light.  It flickers at a constant rate of twice the power
line frequency, 120 Hz or 7,200 flashes per minute on US power.  If your
object has a pair of nice fat lines on it you will see a stationary pattern
at 3600 rpm.  Four lines will get you a solid pattern at 1800 rpm and 3600
rpm.  Et cetera.  If the rotating object is not your crankshaft pulley,
apply the appropriate correction factor.

david
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"