Advancing Timing - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

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post #1 of (permalink) Old 03-05-2000, 11:09 PM
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Advancing Timing

I have a 1987 Bronco with a carburated 351W.
How do I advance the timing? I think it has something to do with turning the distributor cap, but which way and how much do I turn it?
I think I know a little about what advancing the timing does, but I just wanna make sure I'm right: It makes the plugs fire before the piston is at the top of its travel resulting in more power because the burning/expanding air/fuel mixture is occuring while the piston is still compressing. Is this right?
Is there really a noticable power gain from advancing timing?
Is there any downside to advancing timing?
Thanks for your time.

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post #2 of (permalink) Old 03-07-2000, 02:13 PM
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Re: Advancing Timing

Your vehicle timing is controlled by a computer. If you do not have a vast knowlwdge of the system, no timing changes are recommended. Now, the timing is advanced by turning the distributor. It does cause the spark to occur earlier. It should already fire about 10 degrees of crankshaft raotation before the piston is at top dead center. This is because it takes time for the fuel to ignite and expand. The timing advances at higher RPM's because the piston is moving faster, but the fuel always burns at the same rate. Unless you have made certain mods to your engine, you have no need to adv. your timing.

[img]/wwwthreads_images/icons/cool.gif[/img] MG48 - 88 Bronco
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