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-   -   502 timing (https://www.offshoreonly.com/forums/do-yourself-boating-budget/347194-502-timing.html)

BigBsChanga 05-26-2017 03:11 PM
502 timing
 
What should idle and total timing be set at on a gen 6 502 built to HP500 specs. carb motor. Also fuel pressure on demon 850 carb. Thanks

sutphen 30 05-26-2017 08:21 PM
I'd set the total to 34° and let idle timing fall where it may.what ignition system are you using?

temz 05-26-2017 08:51 PM
You may want to stay closer to 32 depending on your setup. Initial will be dependent on you distributor and if that's adjustable then cam plays into it. Demons can take higher fuel pressure I think up to 11ish + psi but I have mine regulated at 9 at the moment.

BigBsChanga 05-27-2017 08:52 AM
Originally Posted by temz (Post 4557503)
You may want to stay closer to 32 depending on your setup. Initial will be dependent on you distributor and if that's adjustable then cam plays into it. Demons can take higher fuel pressure I think up to 11ish + psi but I have mine regulated at 9 at the moment.
mercruiser thunderbolt distributor and ign. thanks for the answer

mike tkach 05-27-2017 09:56 AM
34 deg total advance,8 lbs max fuel pressure.i would set fuel pressure at 7 lbs.

temz 05-27-2017 11:02 AM
Originally Posted by mike tkach (Post 4557577)
34 deg total advance,8 lbs max fuel pressure.i would set fuel pressure at 7 lbs.
Yea you're right checked mine this morning and wasn't as high as I thought, 7.5. Demon manual suggests 6-7.5.

Baja Rooster 05-27-2017 02:23 PM
Dumb question, and since the question has already been answered here, is there much difference from 32* to 34*? I have pretty much the same package and set it at 32* just to be well within the limits while I sort out the carb.

Yours truly,

- Baja Chicken

snapmorgan 05-29-2017 07:27 PM
Originally Posted by Baja Rooster (Post 4557603)
Dumb question, and since the question has already been answered here, is there much difference from 32* to 34*? I have pretty much the same package and set it at 32* just to be well within the limits while I sort out the carb.

Yours truly,

- Baja Chicken
about 40HP


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