Turbo type engine sound ?
04-29-2007, 10:26 PM
#1
Rennlist Member
Thread Starter
Join Date: Aug 2004
Posts: 372
Likes: 0
Received 0 Likes
on
0 Posts
Turbo type engine sound ?
Still trying to get all of the bugs out of my new Porsche(85 wb). This car has not been driven much for the last 10 years and every time I go out someting else crops up. I replaced the belts with OE and the tension is correct. I thought for sure the old belts were the problem but apparently not. Slow acceleration no whine. Medium acceleration and a high pitch whine occurs. Back off and it disappears. Fast acceleration it whines then disappears. I didnt notice any problem with the fan bearing when I changed the belt, felt OK? Any other possibilities.? Thanks Doug
05-01-2007, 04:57 PM
#3
Rennlist Member
Does it whine like the way gears whine? Go out youtube and listen to how those Porsche cars whine when shifting. If the whine continues to increase as speed increases, even as you shift, then it's the rear end/differential. You could also pop the engine cover and manually rev the engine to listen to the whine while inspecting the fan/belt/pulleys. These might help you rule some things out.
05-01-2007, 08:46 PM
#4
Rennlist Member
Thread Starter
Join Date: Aug 2004
Posts: 372
Likes: 0
Received 0 Likes
on
0 Posts
I cant get it to whine by doing it with the lid open manually,I can only hear it when driving. You must be accelerating medium hard, very hard and no noise. If you back off just slightly you can make it go away.I had something very similar on my 964 but it went away with a belt change? CVjoints are new.
05-02-2007, 09:07 AM
#6
Team Owner
Is you wife in the passenger seat when this happens ?
Just kidding ....
Anyway I would sumize that if you can not make it do it while standing it is drivetrain related but not in the engine. You said " belts" ...what belts are on their ? try removing the AC belt and just go with the fan belt to elimintae the AC compressor. hell if it were me I would take both belts off, do a medium acceleration down the street , come back and put it back on. The fan belt will cause your car to overheat and the alternator not to charge but for a 15 second run I think you would be fine.
Then you know , if the whine is gone you know where to look , if the whine is still there you know where not to look and you can move on.
good luck
Just kidding ....
Anyway I would sumize that if you can not make it do it while standing it is drivetrain related but not in the engine. You said " belts" ...what belts are on their ? try removing the AC belt and just go with the fan belt to elimintae the AC compressor. hell if it were me I would take both belts off, do a medium acceleration down the street , come back and put it back on. The fan belt will cause your car to overheat and the alternator not to charge but for a 15 second run I think you would be fine.
Then you know , if the whine is gone you know where to look , if the whine is still there you know where not to look and you can move on.
good luck