Posted by ScottyHOMEy on November 30, 2008 at 18:02:49 from (70.105.234.190):
In Reply to: super c rebuild posted by jonathan mirgon on November 30, 2008 at 16:57:26:
Having a battery ignition, you can use a tach like the old dwell-tachs that hook onto the terminal of your coil that runs to the points in your distributor. I got mine years ago and guard it closely, but they're still available. Not all of the newer ones let you choose 4-cyl, so it's sometimes necessary to take a reading on 8-cyl and double it.
I also use a laser tach. If you're starting out clean, you can get a patch of the reflective tape to stick onto your crank pulley.
On greasier motors, I've put a patch of the tape on the PTO shaft and adjust until high no-load idle turns the PTO at just under 600 RPM.
Just a note, all my books for the SuperC, and the Ser # show high no-load idle as 1815, which is 110% of the rated working (loaded) RPM of 1650.
I don't think you're gonna unglue your motor job by turning it up to 1850. I mention it just in relation to using the PTO shaft for a laser tach. 110% of 540 is 594, so that's my target. 1850 is more like 112% and works out to about 605 on the PTO. Your motor speed will fluctuate enough that 600 is not a bad compromise for either target.
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