Crane HI4 settings

[tprJJ49707]

Got the ignition out of drawer last night and read accompanying paperwork,
I am looking for input as to setting rev limits...and also wonder what would be considered optimum advance (on upper filpot).

[FSZEKE302]

I set mine at 6000 rpm limit, as close to half way between min[5000] and half range [7000]. I set my timing according to the instructions for using a back up timing light. Used 35 degrees and set pot at max advance. I have always used 93 octane and I get no detonation with it. With stock ign I had to use 93, I'm going to try mid grade soon, since I can take some advance out with the pot. Interested to see how you come out. Let us know your results please.

[md2420]

thought i'd jump in and get ur take on going with the Crane (or some other electronic ignition) vs. the points......I seem to burn through points (more often than I think I should)....also getting some backfire on my 74 XLH....this a points problem? or as u eluded to a FUEL/octane issue? I'm currently running 91 or 92 (whatever is the highest at my local pumps)....can't say that i've seen 93 around here (AZ)

thx!

md

[IronMick]

Two things that cause backfire are exhaust leaks and lean carb settings. I would check for exhaust leaks first as this is easy, and you can never get a good tuneup with exh leaks.

Put 1/2 ounce of oil into each cyl thru the sparkie holes and run it at idle. You will get lots of smoke for about 5 minutes. Any not from the exhaust ends is a leak which must be fixed.

May as well check for intake leaks while you are at it. Spray WD40 around the cyl-intake-carb joints while idling. Any change in RPM is a leak which must be fixed.

Then richen up the pilot screw setting by 1/4 turn and see if there is a difference.

I have the Crane Hi-4.

[md2420]

thx IronMick....good to know....I've put another post re: my Bendix carb and once I have that worked out, i'll move on to the items you suggested (gotta get it running before I can test for leaks

md