Engine Knock?

January 2nd, 2005, 07:26 PM

I just purchased a 1966 Delta 88 Cinv witha 425. The engine runs, but has a knocking sound. I am not sure where it is coming from, though It does not sound good. I have read that it may be a spun bearing. Could someone tell me what else it may be? (trying to gage whether or not I need a complete rebuilt)

tedster · January 4th, 2005, 04:23 AM

Does the engine knock at idle as well as when you accelerate hard? If it knocks only when you accelerate, there is probably too much advance in the timing and/or you need to run a higher octane gas (this problem will get worse with "winter mix" gases that have additives that make the gas more volatile for easier starting in cold weather).
When I purchased my Cutlass, the 455 had a knock at idle which turned out to be a spun bearing. Hope this helps.

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January 2nd, 2005, 07:26 PM	#1 (permalink)
<66 Delta 88 Conv> Guest Posts: n/a	I just purchased a 1966 Delta 88 Cinv witha 425. The engine runs, but has a knocking sound. I am not sure where it is coming from, though It does not sound good. I have read that it may be a spun bearing. Could someone tell me what else it may be? (trying to gage whether or not I need a complete rebuilt)

January 4th, 2005, 04:23 AM	#2 (permalink)
tedster Junior Member Join Date: Jan 2005 Posts: 3	Does the engine knock at idle as well as when you accelerate hard? If it knocks only when you accelerate, there is probably too much advance in the timing and/or you need to run a higher octane gas (this problem will get worse with "winter mix" gases that have additives that make the gas more volatile for easier starting in cold weather). When I purchased my Cutlass, the 455 had a knock at idle which turned out to be a spun bearing. Hope this helps.