It was very touchy _ are you thinking that it may have been defective ?īut it did work again and behave normally when I tried it on the Mazda again.Īnother thought maybe it needs to be connected to a better 12 volt source because there is too much resistance between the positive side of the battery and the block/firewall ? Too long of a lead so to speak. However, the quarter mile ET slowed down by 0.1 seconds, from less high-end power. Example: Magneto timing was reduced 6 degrees in our blown alcohol drag racer, and our low-end 60-foot times were quicker by 0.05 seconds from more low-end power. It worked steady when I clipped the red lead to one of the acorn nuts that secured the valve cover. Decreasing the timing advance raises low-end power, reducing the high-end. It acted very strange, it failed to even work depending on where I connected the red lead. There was no change in the flickering in relation to engine speed.Īnd yes, I had the black lead on the "live" side of the starter solenoid (very handy place to clip it) and tried the red lead on various places on the fire wall and block thinking there was not a good connection. I just thought of a good comparison when it was on the Bentley _ the timing light flickered like a bad florescent tube at the end of its life. I was hoping someone here would say, "yeah, this brand works well", but that doesn't seem to be the case.Īnd I was very careful to get the polarity correct when connecting it to to the Bentley _ knowing full well it may fry the circuit board inside if it was wrong. I have a "Sun" brand, and it works fine, but there is no adjustment for spark advance on it. I could go with the analog type, but I would like a digital one. The model (CP7529) has a digital display, but it does say the analog type will work with positive ground or at least it gives instructions for it. It may work by using a separate battery and grounding the negative pole of the battery/tool to the chassis. Compatible for all 12 Volt DC petrol systems this timing. The CP7529 is only designed to work with negative ground systems and was never tested to work with positive ground systems. Featuring a tough ABS plastic body to withstand the knocks and punishment of any garage or workshop this Timing Light from Mechpro Blue has been designed for fast and accurate ignition timing readings to get your vehicle running smoothly in no time. Yes you would need to connect to an separate battery to use with a positive ground vehicle. The MSD timing light is a lot better than my brothers craftsman timing light, the MSD has no plastic parts on the inductive pick up. CP7529 from Actron in Cleveland, Ohio, retails for about 115 and contains several features that make it a useful tool to any tuner. Here is a quote from a tech guy from OTC: This is another great MSD timing light harness cable for replacing PN 8992 timing light. I even tried mounting the pick up on the number one spark plug wire in the other direction and that made no difference. I should have described specifically what I did and I did do just that.
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