![]() ![]() I proved it to myself, the extreme over hype sales misinformation about Dial Back and analog systems are only there to sell more product. Sorry, I own three extremely good quality dial back timing lights, one that actually has info that says the DB is ONLY for computer timing functions, trhe other two have a warning to NOT try to use DB on conventional vacuum/mechanical advance systems because the light will not be accurate on Dial Back.Īll 3 have proven to be absolutely accurate on DB when a computer times the engine, but as noted, not even close on an analog system.įrom my own experiences, and what these light makers had to say, I'll keep on reading the balancer timing tape, setup degrees lines for analog, and for my EFI cars, DIAL AWAY. NOT, dial back has, is, and will never, not now, never will be accurate on a system that doesn't have the computer computation the light needs to be accurate. Let's see, ONE dial back is just fine with an analog timing situation, THAT DOES NOT HAVE ANY COMPUTER LAG THAT THE DIAL BACK HANDLES, and is "dead on". Is it worthwhile to have a timing light with a dial back feature, YES, if you ever go to electronic timing, it will be a benefit, but if not, leave it off, and read the antique timing curves right, with the dial back OFF. ![]() The dial back timing lights usually will not give you an accurate timing readout regardless of RPM. The problem at higher RPM is that it is still 1 spark, but it's a longer duration spark. There is no dial back feature that when in operation, reads an analog system properly, NONE, PERIOD. Unfortunately the dial back timing lights cannot interpet the signal under 3000 RPM because you are getting 2-3 sparks for each cylinder. Reading the lines is dirt simple, 2nd line reads at 6 degrees, timing is 26 degrees, 4th line at 2, 42. Now, it is a very simple thing to take a piece of chalk, set the dampener to 10 degrees, and make a new line at TDC, and do it again, 3 more times, that gives you a TDC line, plus 10, 20, 30, 40 50 degrees to read, WITH THE DIAL BACK FEATURE OFF, OFF, OFF.OFF. DO NOT HAVE A COMPUTER LAG TIME TO COMPENSATE FOR, NONE, ZIP, NADA, NOPE, NYET, they read a straight on, non-processed spark event. Here's a clue, EFI computers use inputs, throttle position, EGR, and the rest of the sensor inputs to literally compute just when to make the next spark event, ANALOG SYSTEMS, the ones NOT locked out, that still use mechanical and/or vacuum advance. Now, I KNOW there will be people on here that dispute that last statement above, but, I ask them to point out just where the "computer lag" is that a dial back feature compensates for when reading timing, please. If you have an analog system, with functional mechanical and/or vacuum advance, then, NO, THE DIAL BACK FEATURE IS NOT ACCURATE TO READ TIMING. If you have a distributor that has NO mechanical, and/or vacuum advance, then, YES, the dial back feature will give you accurate settings reports on dial back. I've heard not all dialback lights are accurate. I want to graph and plot all the spring combo's from my crane kit vs. First off, what exactly do you have for a distributor and type of advance? I need to buy a dial-back light so I can get deeper into disti recurve mods. ![]()
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