![]() ![]() At the same time, the MSD light and the Sears light were virtually identical in performance. I’ve had the opportunity to test these lamps against several well known “professional” models, and I found that a few of the other lights were showing much different timing at engine speeds slightly over 1,200 RPM. Both lights are stable and accurate from zero to 8,000 RPM and because of this, they are well-suited to a modified (as in “drag race”) application. Additionally, this testing also revealed that an older model Sears Craftsman Timing Light (P/N A-2134 – still available used on that big auction site) was considered very reliable and accurate. ![]() Through this testing, they decided to develop their own timing light. Be certain that your light is installed properly (see below) Unfortunately, you can’t trust all digital analysis equipment over the 2,500 RPM ceiling.Īutotronic Controls Corporation (makers of the MSD ignition systems) recognized this problem and began to test a rather large number of available timing lights. To determine the accuracy of your particular timing light, it should be checked against a digital engine analyzer at speeds below 2,500 RPM. If the light is off by two degrees at 2,500 RPM, it might be off by eight or ten degrees at 8,500 RPM – and, as you can imagine, that happens to be a significant amount of error. But what’s the big deal if your timing light is off a degree or two at 2,500 RPM? While it might sound like a marginal amount, keep in mind that whatever error exists in the light at low engine speed levels will be multiplied as the engine speed increases. Last issue, we took a sort of look at timing lights. As we pointed out in the first segment, this vintage Sears timing light has proven to be accurate and reliable. ![]()
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