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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 305



PostPosted: Sun Feb 10, 2019 10:20 pm    Post subject: 991.1 engine rattle Reply with quote

Hi all. I plan to spend some money on my 991.1 c2 Manual in March when I’m back from hols. (Off to Sri Lanka).

I find the 3.4 quite rattley. I’ve had it looked at by the dealer I bought it from and they said it’s fine. But they did say they all rattle to some extent due to all the aux belts and drives etc. I’ve also had six of the valves/ switches replaced in the exhaust recently. To my ear the rattling seems to be getting worse?

My question is if I threw enough money at the problem could I get it to be rattle free?

The sound a car makes is really important to me. I spent countless hours adjusting the tappets on various engines when I was younger. New self adjusting followers and DFI injectors are very noisy I find....

Here is a short clip of the engine when warm:
https://youtu.be/Jt7jgCsAO8A

The rattling is much quieter when the engine is cold by the way. I’m assuming as it warms up things expand and belts get more playable and oil gets thinner.

Any thoughts or ideas appreciated.
 
  
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FZP
Estoril


Joined: 18 Jan 2015
Posts: 3721
Location: Cheshire


PostPosted: Sun Feb 10, 2019 10:36 pm    Post subject: Reply with quote

It sounds normal to me. But YouTube vids are notoriously bad for audio issues.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Mon Feb 11, 2019 7:15 pm    Post subject: Reply with quote

Its pretty normal .. i think the only thing i would check if it has a sports exhaust is that the vacuum valve rods are tight .. these can cause a rattle which is tinny in nature and similar to what your video sounds like .

There is nothing untoward there though .
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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 305



PostPosted: Fri Feb 15, 2019 8:17 am    Post subject: Reply with quote

Thanks Dermot

I have OCD when it comes to rattles and squeaks. Is there anything you think I can do to stop this? I’m debating fitting an aftermarket exhaust and putting the car in to someone like 9e to go thought it with a fine tooth comb and replace anything that is badly worn etc. Question
 
  
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DRZ911
Barcelona


Joined: 13 Mar 2013
Posts: 1467
Location: Belfast


PostPosted: Fri Feb 15, 2019 7:41 pm    Post subject: Reply with quote

APL911 wrote:
Thanks Dermot

I have OCD when it comes to rattles and squeaks. Is there anything you think I can do to stop this? I’m debating fitting an aftermarket exhaust and putting the car in to someone like 9e to go thought it with a fine tooth comb and replace anything that is badly worn etc. Question

Had previous 911 cars, and got a GT3 last summer. It sounds like a load of spanners in a rusty bucket at tick-over, the roll cage creaks like a Spanish galleon, the diff clonks like a Massey Ferguson and the interior sounds like a bowl of Rice Krispies. The car is visceral and alive and is trying to communicate. Laughing
All 911 cars do this to a greater or lesser extent, so yours is no different from the rest. Just drive it, enjoy it and keep grinning from ear-to-ear. Thumb
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Fri Feb 15, 2019 7:48 pm    Post subject: Reply with quote

APL911 wrote:
Thanks Dermot

I have OCD when it comes to rattles and squeaks. Is there anything you think I can do to stop this? I’m debating fitting an aftermarket exhaust and putting the car in to someone like 9e to go thought it with a fine tooth comb and replace anything that is badly worn etc. Question


Its difficult for me to say 100% .. the sound clip seems fine to me but without looking i can never be totally sure ..

My best guess atm is possibly the vacuum valves on the exhaust might be rattleing .. but they may well be totally normal .

Only way forward if your not happy is to have someone like me .. a mechanic put it on a ramp and check it over .. that way the mechanic can say its ok and thats normal or not .
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Thank you all so Very much .

She's not going until july 2020 though .



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