Engine Sound Signatures

[DAP]

I have an excellent pair of ears. Really. I have noticed a difference in the various sound elements that make up the sound of my tractor's engine, in this case the 30hp 4cyl Kubuota in a B7800.

Approaching the 90 hour mark and in definetly more humid and colder conditions, without using block heat, and holding the glow plug for about 30 seconds ... the engine fires easily, runs evenly but with a decidely more 'pingy' or 'metallic' pulse, common to diesels.

Most, if not all of us tractor owners, can tell the difference between a diesel and any other type of motor merely by sound.

Has anyone else noticed the changes in sound of their diesels? What do you think or attribute it to? Broken In? Humidity and Temperature? Part's Failure?

Is it just that the engines sounds dissipate as the motor becomes lubricated and warmed?

Whadyall think?

 

[Deaf]

I Can’t

 

[Ken_CT]

I Can’t

Deaf can't here the difference.

 

[NewToy]

I have an excellent pair of ears. Really. I have noticed a difference in the various sound elements that make up the sound of my tractor's engine, in this case the 30hp 4cyl Kubuota in a B7800.

Approaching the 90 hour mark and in definetly more humid and colder conditions, without using block heat, and holding the glow plug for about 30 seconds ... the engine fires easily, runs evenly but with a decidely more 'pingy' or 'metallic' pulse, common to diesels.

Most, if not all of us tractor owners, can tell the difference between a diesel and any other type of motor merely by sound.

Has anyone else noticed the changes in sound of their diesels? What do you think or attribute it to? Broken In? Humidity and Temperature? Part's Failure?

Is it just that the engines sounds dissipate as the motor becomes lubricated and warmed?

Whadyall think?

I'm sure some of it can be attributed to the engine breaking in. I notice mine sounds different on a real cold day but gets back to normal as it gets heated up. It also has different sounds according to where your standing, left side or right side.
John

 

[KICK]

I have 30 years exposure to Diesel engines.

I can't hear all that well anymore. LOL.

back in the old days when I first started working on them, they were really noisy but they've quieted down over the years.

what your talking about is true . I've noticed that as a Diesel engine warms up to operating temperature the combustion noise becomes less pronounced.

 

[orezok]

HUH?? Can you type a little louder ....I can't hear you.

 

[Deaf]

Did you hear the one about the two deaf guys walking into a bar?
-
-
-
-
-
-
-
Neither did they.

 

[Jerome]

I use to have a car with no dash lights I had to gage my speed by sound I got pertty good at it. then I fixed the lights.

 

[Opti-Mist]

It used to be really apparent with gas engines, one could tell the make by the sound. Mufflers also influence the sound.

 

[ozzie tractor]

diesel knock is worst when an engine is cold, as they warm they quieten down a bit. can still remember the first old CAT motor i worked on. i was standing on the track and this thing started up and i though o my god, this things about to explode. the foreman looked at me and said "gee this thing soounds good". cold morning and id never heard one cold.