spoon98hatch

So finally drove the car today after a month long hiatus. Got into boost for a little spirited 3-4 punch. All was fine- pulled into my parents driveway and parked the car.

Started the car to move it so we could go to lunch- all was normal.

Started the car a couple of hours later to go back home and there was an insane loud knocking sound coming from the engine.

Pulled the drivers side valve cover- No visible damage. Im running comp 921s. The rocker arms werent messy at all.

Put it all back together- my buddy came over with a stethescope. Started the car again- idle is fine. Oil pressure is at 50ish psi but he said that the knocking is definitely coming from the bottom end.

So please give me some ideas so i can know how bad im gonna hurt lol.

BLOWNBLUEZ06

If it's the bottom end bearings, it could be as simple as changing out bearings, but no way I would get into the bottom without replacing the pistons, rings and rods while you're in there.

spoon98hatch

Yeah thats what im thinking. I just need to figure out where to have it taken to so they can break it down and see what im dealing with. If it was a bearing though- wouldn't the oil psi be low and idle suffer?

Slow Z06

What he said


Hate to hear that **** but atleast its in a driveway and not while driving

schpenxel

Keep the running to a minimum obviously.. Shouldn't be too bad to fix if you can do it yourself.. And have the time

spoon98hatch

Could it be a lifter?

jobberone

spun a bearing. Inspect bearings. Pull filter and check for shavings. Or just pull motor and freshen as necessary. Now's your chance to add goodies.

spoon98hatch

But if i spun a bearing wouldnt the oil pressure drop?

jobberone

Doesn't have to. Doesn't have to be a spun bearing either.

BLOWNBLUEZ06

Doesn't have to.

You can take the oil filter off, cut it open and inspect it for bearing material before you go pulling the entire motor out only to find you have some other, simpler problem.

spoon98hatch

How about a lifter?

jobberone

Pull the filter first. Unless no matter what you're going to freshen the engine. I'd do the former.

spoon98hatch

Yeah im trying to kind of narrow it down because its at my parents house. They have no tools here other than a craftsman set. So im limited on what i can do.

I dont want to have it towed to my house then realize its more than i can handle and have it towed to another shop.

jobberone

Then pull the filter and cut it open. You can do that there.

leo12

it does not sound like a spun bearing, oil presure would drop quickly,does it only do it when the engine gets warm? have you done any work to the motor lately, header work?, etc ?

spoon98hatch

I wish i could- they dont have a floor jack.

spoon98hatch

I havent done anything to the motor. I barely even drive the car.

madmatt9471

Any blow by?

Very poissible a ring could of been launched, that is what happened to my #7 when it was cold and a stock bottom end

Best thing is to pull it and forge the bottom end

Thanks,Matt

spoon98hatch

Yeah how much could I get away with cost wise- assuming the crank is still good- forged pistons, rods and all bearings seals etc.

jobberone

You can turn the crank if necessary. Figure a $1000 a pop for rods and pistons. You could pay more or less. Do not chimp on the rings. Replace your valves, springs and lifters. Cometic gasket. Best bearings.