engine sounds

fordman · Post by **fordman** » Sun Mar 15, 2009 1:36 am

i have heard several enigne sounds in my life and know what most of them are from a bad rod to a lifter ticking. but what doe a piston knock sound like? i was told it is similar to a rod knocking but it sounds more like metal to aluminum knock. is that true?

SteveC · Post by **SteveC** » Sun Mar 15, 2009 1:38 am

hmmm to best of my knowage (which aint all the great btw) it is very close to a rod knocking but sounds a little lighter in sound

binder56jd · Post by **binder56jd** » Sun Mar 15, 2009 5:53 am

http://www.pistonslap.com/

fordman · Post by **fordman** » Sun Mar 15, 2009 5:59 am

thanks for that i was thinking the wrist pin was what was knocking. would a compression test tell if it was the piston slapping the cylinder wall?

willowbilly3 · Post by **willowbilly3** » Sun Mar 15, 2009 6:56 am

I have done a lot of noise chasing over the years and I think a lot of guys were full of bull. Listen through a rod or long screwdriver, yeah right, you can hear everything going on, even the alternator whining but to discern a piston slap from a wrist pin ect? Well, not me and not them either I don't think.

BTW, a cracked flexplate can sound exactly like a rod knock. Or a loose fuel pump arm can be misdiagnosed for any number of maladies. It's a crapshoot.

willowbilly3 · Post by **willowbilly3** » Sun Mar 15, 2009 6:58 am

fordman wrote:thanks for that i was thinking the wrist pin was what was knocking. would a compression test tell if it was the piston slapping the cylinder wall?

BTW, piston slap should be loudest when cold and quiet down as the engine warms up. I doubt you would see much on a compression test except a wore out engine which I would think it would be if there was piston slap.

fordman · Post by **fordman** » Sun Mar 15, 2009 7:08 am

i figure this engine is going to be parted out anyway. i am just trying to learn more from the bad stuff. its not like i'm going to fix it. i just want to know what it sounds like. so i can tell what the next one might be.

sacramento_ford · Post by **sacramento_ford** » Sun Mar 15, 2009 10:03 pm

fordman wrote:i figure this engine is going to be parted out anyway. i am just trying to learn more from the bad stuff. its not like i'm going to fix it. i just want to know what it sounds like. so i can tell what the next one might be.

i had a ticking sound too, but i changed my fuel pump and its gone.

fordman · Post by **fordman** » Mon Mar 16, 2009 12:33 am

i can actually turn this one back and forth slightly with the fan blade and hear it make the noise. i think it is a rod but i am unsure. i haven't started the engine yet. that will be tomorrow for sure. i have stripped everything but the things needed to drive it to test it.

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