how does an advance timing light work??
i understand how a reg timing light operates buti cant seem to grasp how a dial on the back of an advance one even needs to be there :1
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Re: how does an advance timing light work??
The dial will change the speed of the light so that the marks on the block and pulley will line up at whatever you dial it to.
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Re: how does an advance timing light work??
the reason its there is for motors that dont have a million marks on the pulley...right?
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Re: how does an advance timing light work??
Originally Posted by ghettoturbo
the reason its there is for motors that dont have a million marks on the pulley...right?
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Re: how does an advance timing light work??
honda pulleys have TDC, 14* 16* 18* marks. wouldnt using a reg timing light be ok?? if it sparks at 18* then the 18* mark would be lit up right??
how does this dial know when its 18* ? |
Re: how does an advance timing light work??
if i remember right...you would set it to 18 and then it will b set at 18 when youre lined up with the tdc mark. otherwise you could leave it at zero and line up with the 18 mark
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Re: how does an advance timing light work??
EXCELLENT QUESTION........too few will ever be able to answer correctly.
Without a logic circuit to know the rpms vs degrees of advance, it's all a big guess with a dial back timing light. FYI they are set to be accurate at 900 rpm. I'll take a direct read timing light and a fully degreed balancer when setting timing. 16 degrees crank at 5000 rpm, MSD pulled another 2-4 degrees (depends on chip) when the last stage was engaged. 740 BBC making 1500 hp with 300/300/400hp shot of nitrous. If high gear hooks she eats 1000 shot and ------- loves it!!!!! Lenco trans Launch, stage one is in, hit stage two before grabbing second so the slipper clutch takes the abuse and avoid tire shake, grab third and keep it straight, grab 4th and if your balls are big hit that last button!!!!!!!!! 6.8x @ 215-220 mph Not bad for a motor setup to run Pro-Mod in a 1990 chassis that won't hook it. |
Re: how does an advance timing light work??
Originally Posted by Racintweek
how does this dial know when its 18* ?
The timing gun doesn't know ----. All it can do is relay the light at the exact same time as the spark or delay the light. They can not retard the light, thus the reason tehy are called advance timing lights.. The only way to do that would be to put the trigger on a different spark plug wire. |
Re: how does an advance timing light work??
i figured it was kinda pointless to buy one with a dial because it just didnt make any sense as to how they operate. if there is no way to hook it to a crank trigger then it cant possibly know where in the crank rotation you are.
i geuss my skepticism was correct this time |
Re: how does an advance timing light work??
Originally Posted by Racintweek
i figured it was kinda pointless to buy one with a dial because it just didnt make any sense as to how they operate. if there is no way to hook it to a crank trigger then it cant possibly know where in the crank rotation you are.
i geuss my skepticism was correct this time |
Re: how does an advance timing light work??
but you only hook up the light to the #1 plug wire. how can it tell when #2 fires??
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Re: how does an advance timing light work??
Originally Posted by Racintweek
but you only hook up the light to the #1 plug wire. how can it tell when #2 fires??
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Re: how does an advance timing light work??
i know that, i was questioning the other guy's logic ;)
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Re: how does an advance timing light work??
Originally Posted by Racintweek
i figured it was kinda pointless to buy one with a dial because it just didnt make any sense as to how they operate. if there is no way to hook it to a crank trigger then it cant possibly know where in the crank rotation you are.
i geuss my skepticism was correct this time No it's not. Timing guns operate in a very simple way. They trigger the light when there is current flowing through a spark plug wire. To advance this, they simply delay the flash of the light. The delay is calculated by RPM's. It is very simple. If you set the gun to zero, then the resulting flash is whatever the ecu is triggering the coil at. Like Mista Bone said above about the dial ones. They are only accurate for a certain RPM, because they have no logic circuit to apply the appropriate delay for different RPMs. They still work however, but they are largely inaccurate unless you know their limitations. |
Re: how does an advance timing light work??
look at my signature, then question my logic ::)
Besides being a master certified technician (btw, i took all the tests at one testing period, took a total of about 3 hours for all 8, and averaged 88%) I'm certified by Nissan, Toyota (two teests left to master Toyota certification), and Honda. I placed 1st in state at VICA last year (with a point gap between me & second greater than the gap between 2nd and 4th, 2nd place was a friend of mine, also ASE master certified), 4th place at national VICA (1.6% behind first, i'm pretty pissed about that, I wrote down all the answers at one station backwards, had they been in the correct order I would have been ~2.5% ahead of 1st). So basically, if I'm giving someone an answer, it is correct. If I'm making a guess, I will say so, but I'm usually correct then too. |
Re: how does an advance timing light work??
i guess "questioning your logic" might not have been the right words. i wasnt saying you were wrong, i was seriously asking. thats the whole reason behind me making this thread, to find out how it works.
and FYI: just because you are a master tech doesnt mean you dont make mistakes ;) no one is perfect |
Re: how does an advance timing light work??
Originally Posted by Racintweek
and FYI: just because you are a master tech doesnt mean you dont make mistakes ;) no one is perfect
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Re: how does an advance timing light work??
i highly doubt you've never had a come-back. there are a few techs at the shop i worked at that have 20+ years experience and are master techs and ---- up sometimes.
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