| Author |
Message |
Mark (Markg)
Member
Username: Markg
Post Number: 488
Registered: 2-2001
| | Posted on Wednesday, May 28, 2003 - 9:48 am: | |
Dr. Tommy - my 82 GTSi has exact same whine from behind driver's head; sometimes in cool morning starups I just sit and listen to it, it sounds just like a jet warming up on a runway!
From what seems passenger side I also get a whine, very similar, may be comming from air induction?
Anyway, seems normal, and I hear similar whines from other non-F cars with FI |
Dr Tommy Cosgrove (Vwalfa4re)
Intermediate Member
Username: Vwalfa4re
Post Number: 1170
Registered: 5-2001
| | Posted on Tuesday, May 27, 2003 - 9:38 pm: | |
Too high for that. It actually sounds like it is coming from behind the side window louver from the driver's seat. I have never looked for it but I will be now. |
"The Don" (Mlemus)
Advanced Member
Username: Mlemus
Post Number: 4924
Registered: 8-2002
| | Posted on Tuesday, May 27, 2003 - 7:30 pm: | |
Could be the Fuel pump. |
Dr Tommy Cosgrove (Vwalfa4re)
Intermediate Member
Username: Vwalfa4re
Post Number: 1169
Registered: 5-2001
| | Posted on Tuesday, May 27, 2003 - 7:28 pm: | |
no I am not sure except to say the noise is from my side not the passenger's side. No dull/dim charging light at night either. |
TomD (Tifosi)
Advanced Member
Username: Tifosi
Post Number: 3760
Registered: 9-2001
| | Posted on Tuesday, May 27, 2003 - 4:10 pm: | |
tommy, are you sure yours is not from the alt? |
Dr Tommy Cosgrove (Vwalfa4re)
Intermediate Member
Username: Vwalfa4re
Post Number: 1165
Registered: 5-2001
| | Posted on Tuesday, May 27, 2003 - 4:07 pm: | |
My oil psi is perfect when cold. I'll start paying more attention to this sound and when it comes and goes and report back. |
Dave Helms (Davehelms)
New member
Username: Davehelms
Post Number: 31
Registered: 5-2003
| | Posted on Tuesday, May 27, 2003 - 5:46 am: | |
Tommy, that is the noise I described. Once the oil thins out, the noise goes away. I have never run across one that happened when it was hot.
Mick, take the inlet hose off the cooler and look in there with a mirror, and see if the tubes stick up proud. I have run into a couple where the noise was generated by the pressure relief valve, and the oil cooler was just the sounding chamber. The pressure relief valve is brass sleeved and is in the front of the engine. Some how the brass sleeve twisted in the housing, and the return path for the oil was restricted. On both of these cars the oil pressure was very high when the car was cold (valve wide open because of the restriction). |
Mick Worrall (Catswhiskers)
New member
Username: Catswhiskers
Post Number: 13
Registered: 4-2003
| | Posted on Monday, May 26, 2003 - 1:41 pm: | |
Tommy, from your description, I'd say no its not the same. I only get the noise when the engine is up to temp. but never when cold.
The inlet to the top of my cooler is a straight union. Do you guys think it would make any difference if I put a 90degree elbow on to deflect/constrict the flow of oil?
Surely there is some way of eliminating it, it's so damn annoying.
Mick |
Dr Tommy Cosgrove (Vwalfa4re)
Intermediate Member
Username: Vwalfa4re
Post Number: 1162
Registered: 5-2001
| | Posted on Monday, May 26, 2003 - 10:48 am: | |
I have a similar noise. I usually hear it only on a cold start up/idle and emits from the oil cooler area. I do not get the noise all the time, just occasionally. It is a vibration/hum/whine that is very difficult to describe. I never hear it if the car is up to operating temps.
Do you guys think it is the same thing as described on this thread? |
Dave Helms (Davehelms)
New member
Username: Davehelms
Post Number: 30
Registered: 5-2003
| | Posted on Monday, May 26, 2003 - 7:08 am: | |
I did an artical on this some time back for the local FCA newsletter. The noise is from the cooler. Some of the coolers have the small tubes that carry the oil through the cooling matrix, sticking up into the inlet header tank, and some are flush with the tank. The coolers with the tubes standing up an extra 1/2", sing, as the oil has to swirl around to go down the tubes. The coolers with the tubes mounted flush have a much more direct path. It was simple hit and miss wheather any given car got a poorly built cooler or a properly made one. If memory serves me correct, Ferrari came out with a TSB on this after we found it many years ago. In some respects it can be considered good, as you have an audible warning system telling you when the oil is warm enough to start driving. |
Dave328GTB (Hardtop)
Member
Username: Hardtop
Post Number: 565
Registered: 1-2002
| | Posted on Sunday, May 25, 2003 - 11:27 am: | |
A few years ago, I replaced the oil cooler mounts on my 85 308. Right after that, I could hear a high pitched whine that increased with rpm's. My mechanic mentioned the cooler can make a whine, so I investigated and found that with the new mount, one corner of the cooler was in contact with the side of the engine compartment which greatly amplified the noise. It is my understanding the oil pump actually makes the noise which is transmitted through the system, especially when cold.
Dave |
JRV (Jrvall)
Intermediate Member
Username: Jrvall
Post Number: 1557
Registered: 11-2002
| | Posted on Sunday, May 25, 2003 - 10:05 am: | |
Yes I've heard oil coolers SING. They can make a strange muffled honking, droning noise. Fluid under pressure can vibrate and cause contact material to vibrate causing 'noises'. |
Mick Worrall (Catswhiskers)
New member
Username: Catswhiskers
Post Number: 12
Registered: 4-2003
| | Posted on Sunday, May 25, 2003 - 9:58 am: | |
Hi guys,
Some while back I posted a thread about an engine noise on my 81 308GTSi. In spite of all the suggestions received and swapping numerous components, the noise remained. I finally gave in and took the car to my local specialists for diagnosis. After poking and prodding with their stethascopes, they did manage to pin point the source of the noise. Are you ready for this, Oil Cooler. As soon as the stethascope was placed on the inlet union of the oil cooler, the noise was deafening. The noise didnt appear on the outlet, engine block unions or anywhere else.
They did admit to being a bit puzzled bit pointed out that the cooler was an aftermarket unit, not original and as such, it may either contain a non return valve or simply that the baffle plates could be loose causing the noise.
I've just fitted a brand new MOCAL cooler, slightly larger but still fits within the space allowed, new unions, banjo's and pipes and been out to road test the car. I have to say that the noise is still there but is at least 50% quieter than before. What on earth can make an oil cooler noisy? Anybody come across this or have any idea?
Cheers,
Mick |