From: aas7@po.CWRU.Edu (Andrew A. Spencer)
Newsgroups: rec.autos,rec.autos.tech
Subject: Re: Noise when turning left -- mitigates when applying brake. Huh?
Date: 13 Nov 92 03:58:21 GMT
Reply-To: aas7@po.CWRU.Edu (Andrew A. Spencer)
Organization: Case Western Reserve University, Cleveland, OH (USA)
NNTP-Posting-Host: slc5.ins.cwru.edu





In a previous article, adam@microware.com (Adam Goldberg) says:

>aas7@po.CWRU.Edu (Andrew A. Spencer) writes:
>
>
>>In a previous article, bhhardy@cs.utk.edu (Barbara Hardy) says:
>
>>>
>>>I have an 85 Dodge Omni/2.2L front wheel drive, 112K miles.
>>>
>>>When driving straight ahead, the engine noise is a little louder than
>>>it ought to be. This is in comparison to the engine noise when I am
>>>turning left. It feels quite good then, no tension. As I bring the car
>>>back to straight ahead, the noise increase. It gets positvely
>>>annoyingly and scarily loud when I turn to the right, and the noise
>>>"feels" more "tense."
>>>
>>>I was driving on many miles on winding road yesterday, and I got to
>>>experiment a little with it. Turns out that when I apply the brakes,
>>>the noise drops quite noticebly (sp)! 
>>>
>>>Any clues as to what this could be?
>>>
>>constant velocity joint sounds like my first guess w/o seeing it?..
                                                     ~~~~~~~~~~~~~
this means w/o having first hand knowledge.

>>anyone?
~~~~~~~~~
this means does anyone else have a clue, because i've just given my one
and only clue on this particular subject away...and..well..i don't know
that it was a very good clue at that....
(take notes..test later!)
>
>Aha!
>
>Although noises changing when turning often means a CV joint, the noise
>is generally described as a clicking noise.  More often than not it
>is very hard to hear without sticking your head out the window, or 
>driving next to a sound-reflective surface (wall).  I'll admit, however,
>that the Omni's CV joints are easier to hear than most when they go bad,
>since the car is farily small and econo-box-like.
>
>But! (sorry, got sidetracked), this problem sounds like an exhaust
>problem.  Clues:
>
>o  '...driving straight ahead...engine noise...louder (compared to) 
>    engine noise...turning left'
>
>o  '...bring the car...straight ahead (from left), the noise increase'
>
>o  '...positively loud...turn to right'
>
>o  'apply brakes...noise drops noticeably'
>
>No mention of clicking, and CV joines will generally make the noise when
>turned EITHER way.
>
>In this car, the exhaust manifold pipe (the pipe immediately AFTER the
>exhaust manifold) is held to the manifold by two springs around screws
>with a gasket in between the pipe and the manifold.  This allows the
>pipe to shift when the engine shifts (without breaking) as it
>generally does when accelerating, breaking or turning.
>
>Consider what would happen if the right-hand screw has rusted away:
>
>When the car turns to the left, the engine shifts right, holding the
>joint between the manifold and the pipe closed (and the car quiet).
>
>When the car is going straight, the engine is not shifting, and there
>is a slight gap between the pipe and the manifold (and the car is
>slightly noisy).
>
>When the car is turning right, the engine shifts left, opening the gap
>(and the car is loud).
>
>When braking, the engine twists backward (the top moves slightly
>closer to the driver), closing the gap and quieting the car.
>
>I'd take the car to an exhaust shop.
>
>(Let me know if I'm right!)

ok boyz and girlz..remember the stuff i mentioned earlier?
well...
DREW
-- 
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