Dick, 150 rpm makes 2.5 rps (rotations per second). That is 12.5 rotations
per 5 secs. A 4-stroke engine has 1 ignition every 2 rotations per cylinder.
That makes approx. 6 flashes during 5 secs of cranking per wire. So, a rule
of thumb would be 1 flash/sec, maybe a bit more.
Best regards
Eric
www.brits-n-pieces.com
-----Original Message-----
From: 6pack-bounces@autox.team.net [mailto:6pack-bounces@autox.team.net] On
Behalf Of Sally or Dick Taylor
Sent: Tuesday, December 16, 2008 8:36 AM
To: Stephen Lindquist; 6pack@autox.team.net
Subject: Re: [6pack] Proper starting rpm
Steve---If you have a good, steady spark from the coil wire to ground, then
things are probably OK from the points to the coil neg. If you can't get
spark to the plug wires, then the rotor is suspect. Or something in the cap
area.
The no-start could be timing related, but you should still be seeing spark
from the plug wires. Approx. 12 flashes during five seconds of cranking, per
wire.
My best guess for crankshaft rpm when using the starter motor would be
around 150 rpm. A lot depends on how much drag is from motor parts,
compression, oil viscosity and the like.
Dick
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