Since i got the H.O whipple installed a little over a week ago, i've started noticing this intermittent whine coming from the engine compartment during cold starts, and last a few minutes till the engine is fully warmed up.

i tried to listen carefully and locate the source of the noise to no avail.

The noise is a medium pitched constant whine, that changes pitch from time to time, and suddenly stops for a few seconds.. returns for a few, then stops completely as the engine fully warms up.

First thing i suspected was the IC electric water pump, but i've heard the sound it makes with the ignition on, and engine off.. and that was more like a light buzz, pretty different than the whine i hear with the engine on.

Please check the video and pay attention to the sound.. it becomes a bit more audible at around 00:25 cuts off for a bit, then returns at 00:42 and so on..

in case the video isn't yet ready or the sound isn't clear enough on YouTube, i've also uploaded the soundtrack as a 192bit MP3

your thoughts please?

thanks in advance!

 

I listened to the MP3. If I'm hearing it right, it almost sounds as if someone is blowing into a flute.

 

yup.. that's it
the pitch does resemble a flat note from a flute

 

Sounds like it could be a belt or something.

 

i couldn't see any vibration on any of the pulleys, or anything abnormal with the belt
in fact it runs just fine.. just give it a few minutes to warm up and the noise is gone.

usually belt slips sound way different than that.. right?

 

Belt slips sound different. I'm not saying it was a belt slip, but the way it comes and goes does sound like a high speed vibration to me, and the only thing I can think of that matches that would be a belt. Other than that it might be something inside the whipple, which I have NO idea how those things insides work, so I'm no help there!

 

Sounds like either a belt/bearing or maybe a air leak?

maybe try using a rubber hose to isolate where sound is coming from (least thats what a muffler guy did once with mine)

could it be from here?

 

keeping track of my progress?
that's a good guess, but i had the noise before i installed the water temperature sensor there

once she's back from the bodyshop, i'll probably gonna go around the engine compartment with a Doctor's Stethoscope to see where the heck it's coming from!

 

Try to isolate the noise, by using a spray bottle filled with water to spray the belts, pulleys and other parts including vacuum lines, separately, to see if the sound changes.

 

Thanks for the tip Lime GT!

 

Hey Louie... you have twin screw S/C under hood now... it's normal.

 

okay okay.. so i'm stressing over nothing and it's all normal
but where exactly is it coming from?
i love my SC whine, but this is different :S

 

Well i sent the video to Whipple..
let's see what they say about it

 

Good idea!