GM TB injector questions, HELP!

[Michael F. Sargent]

Hey Fred! Your reality cheque bounced.  :-)

Yes, but its still too fast for any kind of meter... an occiliscope will 
help you out tremendously.  For example, at 1000 RPM, each cylinder fires 
twice, which means you have 500 pulses per minute divided by six cylinders, 
which translates to 125 pulses per minute.  Meters just don't cut it... 
still way to fast.  That's assuming the injectors are open during the 
intake cycle, and not modulated, which someone else could answer better 
than I.  If its modulated, you have several sharp pulses per cycle.

OK. At 1,000 RPM, the crank rotates 1,000 times per minute. On a four stroke 
engine
each cylinder fires every second revolution, so there will be 500 power 
strokes per minute
per cylinder.  Since this is a six cylinder engine, that means there will be 
3,000 ignition 
events per minute (or 50 per second). 

Determining how many injection events per minute will require knowing what 
type of EFI
system it is (i.e., gang injection would probably fire each injector 1,000 
times per minute,
while sequential would only fire 500 times per minute (per cylinder).

	Mike