99 camaro makes noise

[samuel99]

i just bought a SS camaro with 85,000 miles it makes knocking like noise when i first start it up but then it seams to stop after it runs for a min. the guy said that all ls1 make noise this is the first ls1 that ive been around got a 95 camaro with a 383 lt1 dont know alot about the ls1 does all ls1 make noise if not what mite it be?

[WS6SP33D]

Piston slap is my first guess and second guess would be valve train. Yes ls1's are commonly loud motors when it comes to making noise.

[samuel99]

will a piston or rod fly out would you spray it with piston slap??if so what would be to much??would putting pistons in it break the bank

[WS6SP33D]

will a piston or rod fly out would you spray it with piston slap??if so what would be to much??would putting pistons in it break the bank

No im not saying you need pistons. Almost every ls motor that comes in my shop and i have delt with has piston slap. But as motor gets hot they expand and it quits making the noise. And i am not understanding spray it with piston slap?

[pajeff02]

My guess is he asked if it would be ok to add a nitrous system to it.

OP: As stated, our engines are notorious for being noisy when cold. The combination of a short skirt piston and different material expansion rates results in "piston slap". This noise generally goes away as the engine warms up and should be non-existent when hot. The valve train is also known for a "sewing machine" type noise. Our car has both and it's just a fact of life with an LS1. Just be sure to warm the engine up before playing with the loud pedal and you'll be fine.

[WS6SP33D]

Oh ok thanks Jeff i see now lol. I was on my phone at the shop and couldn't understand it. But i see now.

[samuel99]

what is the best oil and filter to use the guy i bought the car from told me thay changed the oil but he didnt say what kind of oil and the sticker on the windsheld just has the miles for the next oil change what about lucus oil stablizer

[WS6SP33D]

You you search there are plenty of opinions on oil threads here. I use mobil1 5w/30 and mobil1 filter. Not big on the use of stabilizers.

[matt evans]

all the ls motors in my shop have the piston slap and Zinger sewing machine valvetrain sound going on. Only way to not hear it best i can tell you is to get some loud exhaust. Like the others said before once it heats up your fine.

[pajeff02]

We have a couple of good threads on oil and filters. I think the top rated filter right now is the Fram Xtended Guard (believe it or not), with Amsoil, Wix (same as Napa Gold), Mobil1 and others also being preferred. Good oils include Amsoil, Mobil1, and Penzoil Platinum. Opinions vary quite a bit on this topic.