I'm going through a bunch of "engine knock" youtube videos and every one's arguing between piston slap and bearings. Plz to find me a video of true engine knock, thanks.

7/10/2008 10:59:59 AM

??? rod knock or piston slap? or wrist pins? or cracked flywheel? or compression leaking past the head gasket? or detonation? or lifter tap? rocker shaft?

7/10/2008 11:17:25 AM

detonation

[Edited on July 10, 2008 at 11:18 AM. Reason : spark knock]

7/10/2008 11:18:33 AM

Kaboom?

7/10/2008 11:26:25 AM

put your car in 4th or 5th and go uphill at like 20mph.

you can hear pinging and what not. but if your car is tuned the right way you may not hear it.

sounds like marbles in a can

[Edited on July 10, 2008 at 11:36 AM. Reason : ]

7/10/2008 11:29:17 AM

cat sneezes.

7/10/2008 2:15:25 PM

knock knock
who's there?
rod
rod who? oh shit

7/10/2008 2:53:34 PM

ting, ting
ting, ting, ting, ting
under acceleration.

7/10/2008 3:37:48 PM

What is generally the cause of detonation, if there is such a thing as a "general" cause? My parents' Crown Vic pings pretty severely going up hills, I noticed recently. Only calls for 87 octane so they're not using the wrong type of gas.

[Edited on July 10, 2008 at 7:10 PM. Reason : r]

7/10/2008 7:09:50 PM

sort of like the sound of a chain dragging the road.

7/10/2008 8:06:57 PM

^^ if the engine timing is off and/or the car is running too lean

7/10/2008 8:28:24 PM

A lot of times with older engines what you're hearing is pre-ignition which is pretty similar to detonation. It's fairly common as a result of carbon build up creating a hot spot that ignites the fuel early.

I had an old truck that would ping like crazy with 87 octane, but it ran almost perfect on 89 and never even had a hiccup on 93. I just ran 89 in it. Maybe your parents should give it a try in the Crown Vic. If it's pinging that bad they might actually get enough extra mileage out of it that it becomes cheaper to run a higher octane.

7/11/2008 12:04:40 AM