Engine knock
 

Hey so my camaros got a 350 swapped into it and today it started making an aweful sound and im looking for help narrowing down on what it is. When you start it and drive around under about 2500 rpms you can hardly hear anything, maybe a little tick but nothing really noticable. Above about 2500rpm it starts making an aweful knocking sound, sounds like someones beating my oil pan with an air hammer or like a 3/4" air gun that gets worse and worse with rpm and it happens regardless of load. Any ideas would be great thanks.

Re: Engine knock
 

First step, I'd pull all the spark plugs and see if they tell a story. Post pictures here if you want help reading the plugs. Make sure you know which plug belongs to which cylinder in case you need to follow up with something.

Meanwhile, might be smart to stop running the engine for now.

Re: Engine knock
 

Another thing to check for is a cracked flexplate or loose flexplate bolts (assuming it's an auto transmission).

Re: Engine knock
 

Sorry it's a manual, would the same apply for the flywheel?

Re: Engine knock
 

It could, just less likely.

Re: Engine knock
 

It's impossible to diagnose a noise here; there are countless causes of knocks, and you'll have to get under the hood/under the car and track down the source, location-by-location.

http://assets.bodybuilding.com/forum...cons/icon2.gif Be extremely cautious under the hood with a running engine; the drive belts/pulleys will grab any loose clothing---or fingers.