![]() The first reason is that many timing lights are not designed to provide accurate readings above 1200 RPM. There are two reasons why you should check a timing light. The last item considered is the test equipment, your timing light. If the vehicle doesn't perform as expected the ignition system might be suspected. Therefore the timing light becomes critical to ignition performance, because you are basing the ignition system timing on this device. In just about any ignition application or installation, synchronizing ignition firing with piston position is done with a timing light. This "Tech Bulletin" from MSD has some interesting info: I remember in the old days having to set the timing at night just to be able to see the damn thing flash! But, at least they worked! Ever repaired one? I'm looking at the smaller hand held ones with one wire, no advance option, and self contained batteries. PlasticmanAs Shultz would say."very interesting" you can't even trust the darn things. ![]() The Actron was the brightest, and the Equus the dimmest. Both fired at zero, and worked fine at all RPMs. An older Craftsman Inductive pickup, and a cheap Equus Inductive pickup unit. I also tested my other 2 timing lights at the same time (both non "advance" type). ![]() of error is not a lot, it still can matter. would actually be 30 crank deg.Īctron set at 62 deg. would actually be 10 crank deg.Īctron set at 32 deg. In each case, if I added 2 degrees to the Actron setting as a correction factor, it would fire at the correct point.Īctron set at 12 deg. (48 crank).Īctron set on 60, Sun read 29 dist. (38 crank).Īctron set on 50, Sun read 24 dist. (28 crank).Īctron set on 40, Sun read 19 dist. (18 crank).Īctron set on 30, Sun read 14 dist. (8 crank).Īctron set on 20, Sun read 9 dist. When the Actron's advance dial was set on "0", Sun agreed "0".Īctron set on 10, Sun read 4 dist. In other words, 2 separate sets of tests. The Actron readings showed a consistent 2 degrees of error at all positions above zero, as tested both 500 & 1000 dist. I compared it's readings with a distributor on my Sun Machine, to check it's accuracy (firing a separate ignition coil to fire the Actron strobe/circuit). I have an Actron CP7528 (Inductive pickup with the advance dial). Beware that the adjustable advance lights are not necessarily accurate.
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