Engine Knocking Noise.. help!

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09-17-2004, 06:01 AM

#16

Gogats

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I would say the 6 to 3rd mis shift at 140 took care of your engine. Let me know if you are parting it out.

09-21-2004, 02:35 AM

#17

downsti

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how does the knocking sound like?? sorry im kinda slow hehee

09-22-2004, 12:14 AM

#18

RoadSpike

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Quote:

Originally Posted by downsti

how does the knocking sound like?? sorry im kinda slow hehee

Engine specific but litterally like a knock on a door though in my limited experience with knock higher pitched than your average door knock.

09-22-2004, 04:22 AM

#19

Gogats

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knocking is also known as pinging, kind of sounds like a metallic ping in the engine , you will know it when you here it.
http://zhome.com/ZCMnL/PICS/detonation/detonation.html
that link out to scrare the heck out of you

09-22-2004, 09:00 PM

#20

Krinkov

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rod knock and detonation "knock" are entirely different sounds, det sound more like a tapping or even ticking, a rod knock is just that

09-22-2004, 10:18 PM

#21

verc

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Quote:

Originally Posted by Krinkov

rod knock and detonation "knock" are entirely different sounds, det sound more like a tapping or even ticking, a rod knock is just that

so what is rod knock ok or something? I'm confused.

09-23-2004, 11:16 PM

#22

RoadSpike

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Quote:

Originally Posted by verc

so what is rod knock ok or something? I'm confused.

I don't think you can get rod knock until you bend a rod so thats definitely not ok.

Piston slap is just becuase the components are loose when cold so they shake a bit making noise, at least what i understand about it.

Pinging is like dropping bb's into a tin can.

09-23-2004, 11:38 PM

#23

Kevin M

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Quote:

Originally Posted by RoadSpike

Rod knock is also caused by worn conrod bearings. The rod shakes around either the crank or the piston wrist pin. To understand what I mean, loosen your wristwatch 2 or 3 notches and shake your arm back and forth.

Piston slap is more common with forged pistons, which expand more when hot. This means that when they are cold, there is a larger gap between the piston and cylinder. It should go away as engine temp rises, gradually fading out within a few minutes of startup. Your explanation is correct, I just wanted to add a little detail.

BBs, nails in a blender, popcorn... anything that is a harsh metallic discordant sound.