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Old 04-06-2005, 10:53 AM
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Rattling noise at load

Need help.... Ive got a new 351w from Ford Racing. It makes a rattling or ping noise at around 3000 rpm or when I jump on the gas. I'm running 91 octane with timing set at 10 deg. Under 3000 rpm it runs great so I'm confused. Could it be detonation? or Fuel mixture?

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Old 04-06-2005, 11:18 AM
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Sounds like detonation. Did it always do this or did you change anything? True getting premium from a different gas station. Might just of had a bad batch of gas.

What type of car/engine is this?
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Old 04-06-2005, 11:25 AM
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what is your total timing and what is your vac advance set at
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Old 04-06-2005, 12:13 PM
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The engine only has 50 miles on it. Its in a 56 Ford F100 truck.

I'm not sure what the total timing or advance is. How do I find this out?
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Old 04-06-2005, 12:29 PM
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Timing tape or a dial timing gun.
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Old 04-06-2005, 03:01 PM
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Cut the timing Back to 6* or 8*,+ Try It.........
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Old 04-06-2005, 03:03 PM
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What ever you do don't keep detonating it. That is VERY harmful to the engine. Figure out what's going on. Get your timing straight, that's very important. You have a heavy vehicle so that engine will see a lot of stress.

If the timing doesn't cure it try running some racing gas and see if that cures it, if so, you may need to lower your compression ratio.

Do you know what the compression is? Does it have aluminum heads? What rear gears? Stall? etc... All these things can effect your pinging.

Royce
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Old 04-06-2005, 03:51 PM
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im not meaning to be a thread stealer.. but what about a chirping noise at wot... its like chirp. chirp chirpchirpchirp.... chirp lol.. its annoying and it just started about 10,000 miles ago.. its a 99 silverado with 86,000 miles
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Old 04-06-2005, 04:35 PM
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Small exhaust leaks (at the header mostly) can be known to make chirping noises.
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