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  #1  
Old 03-03-2008, 11:51 AM
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78bigunns 78bigunns is offline
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Guys who set the 351w timing to 14 BTDC....

Why did you do it? Is there a small gain somewhere?

I noticed it in some sigs, and thought there was some info on thread somewhere, but my searches show more generic stuff about timing setups.

If this is something that will even in the slightest improve a regular trucks performance, I'd like to know, and also how to set it on these trucks with the "spout".

Only timing I've ever done was on a 460/carbed, and a 352/carbed.

Thanks for any insight or explanations.

Blair
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Old 03-03-2008, 12:44 PM
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Setting base timing is the same on the '87-97 EFI trucks as it is on the earlier carb'd motors, turning the distributor clockwise advances the base timing, and this must be done with the spout removed on the EFI motors. Advancing the timing from the factory setting of 10deg BTDC will produce more TQ and HP, but it will also make a motor more detonation prone. You should not just set it where somebody else has, every motor is different and it's sensitivity to detonation will be different, so adjust it to whatever the motor will tolerate. How do you know how much? Start with 2 degrees additional advance, and then take it for a drive and try to load the motor and listen for pinging or hesitation. At hwy speeds in OD under part throttle(just before the tranny downshifts for an auto) in hot weather will be highest load. If it's OK with 12degrees, bump it couple more and test again. Once you make it ping you want to back it off to the previous setting.
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Old 03-03-2008, 01:33 PM
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Thanks for the explanation Paul. I have completely grasped the concept.

I'll see what gives maybe one night this week.

Is there a accurate way to describe the detonation, the way it sounds?

I'm sure I've heard it, but wouldn't have known what I was listening to, so I may not have realized it was confirmed detonation.

I guess I can tinker and roll out, see how it goes.

Thanks again.

Blair
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Old 03-03-2008, 08:57 PM
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Ping is what we used to call "Valve clatter". To gain more advantage from advancing the timing, you can upgrade to a higher octane fuel. Bump the timing till it pings, then try more octane and see what the motor likes. Your mileage will likely improve too, offsetting the cost of the higher octane fuel.
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Old 03-04-2008, 08:29 AM
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Yeah.. pinging sounds like a rattle or clatter, some people say it sounds like shaking marbles in a can. It won't be really loud so you'll have to shut off all noise generating devices and listen carefully.
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Old 03-04-2008, 01:53 PM
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Cool, hope to poke at her tomorrow and tinker with it.

Let you know how it goes.
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Old 03-04-2008, 01:53 PM
 
 
 
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Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)

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