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Rattling noise at load

1K views 8 replies 6 participants last post by  Siggy_Freud 
#1 ·
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?
 
#7 ·
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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