[s-cars] where's my intake whine?

[Mike Fitton]

Yeah, I was a little worried that it could be that.  Thanks for the 
input...I'll pull the hose off and check the shaft play sometime.

-Cheers!
Mike

Jerry Scott wrote:
> Mike
> Depending on the mileage of your car, this could be the bearings in the 
> turbo going bad and starting to get noisy.  You can test this by 
> removing the intake hose and moving the turbine with your finger.  Check 
> to see if it has any axial or radial slop.  There should be practically 
> none.  The turbo can go a long time with this condition before it stops 
> turning.  They are rebuildable as I recall for around $335.
>
> Others I'm sure will pipe in on this noise which could be totally 
> something else other than the turbo.
> Jerry
>
> Mike Fitton wrote:
>
>   
>> Okay, I'll go ahead and admit that I've been lazy and haven't even 
>> attempted to pressurize the intake and see what's up.
>>
>> With that out of the way, here are the symptoms.  When the engine's cold 
>> there's a very noticeable whine whenever the boost gauge reads to the 
>> right of about 5inHg.  I don't usually boost it at all when it's cold, 
>> but in the interest of science I decided to a few times.  It makes the 
>> whine under light vacuum, light boost, and dead in the middle as far as 
>> I can tell.  The noise mostly goes away when the engine's fully warm.
>>
>> I don't seem to be having any trouble achieving my usual max boost in 
>> the low 20s.  It's possible that I'm imagining it, but it might be 
>> taking slightly longer to get there.  If it is, I wonder if that could 
>> just be climate change (seasonal kind, not Soylent Green kind).
>>
>> I could very well be mistaken, as this one has only happened once.  I 
>> think I once heard the diverter valve activate momentarily while I was 
>> full throttle on an on-ramp.  I glanced at the gauge and didn't see it 
>> moving, so either I imagined it or didn't look in time.  I haven't 
>> noticed any other strange noises that sound like a failing DV.  It's a 
>> metal Forge valve, so maybe it makes different sounds than the 
>> well-documented failing stock DVs.
>>
>> I've been itching to buy the Apikol IC kit, but I don't want to spend 
>> the money now if I don't have to...especially if the problem is with a 
>> part that kit doesn't include.  I've gone through and tightened/replaced 
>> as many of the intake clamps as I can easily reach, but to no apparent 
>> avail.  Visually, everything appears to be in order.
>>
>> Any thoughts?  Make a pressure tester?
>>
>> -Cheers!
>> Mike
>>
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>
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