05-15-2012, 10:26 PM | #1 |
Private
26
Rep 72
Posts |
Ticking sounds after turning off engine..
I've recently noticed a lot of ticking sounds from the engine bay after turning off the engine. It starts rapid and then less frequent and is usually gone by 2-3 minutes.
I'm thinking it's the exhaust manifold or parts cooling, but I'm a little curious to know if this is normal. I hate to keep comparing, but my Accord never did this. I filled my F30 up with BP 93 octane fuel and had no driving issues or sounds with engine on. Anyone else also notice their F30 making sounds after ignition is off? |
05-15-2012, 10:44 PM | #2 |
Brigadier General
675
Rep 4,959
Posts |
My old E90 335i made ticking noises in the garage after turning the engine off; my current 335i xDrive makes ticking noises in the garage after turning the engine off; and my 750i xDrive makes ticking noises in the garage after turning the engine off.
All have been 100% reliable. I wouldn't lose any sleep over it my friend.
__________________
Current: '23 G20 M Sport 330i
Current: '20 X253 GLC300 SUV Gone: '20 W205 C43 Sedan Gone: '18 W205 C43 Sedan Gone: '13 W204 C63 Sedan |
Appreciate
0
|
05-15-2012, 11:01 PM | #4 |
Brigadier General
595
Rep 3,870
Posts |
+1
__________________
|
Appreciate
0
|
05-16-2012, 12:22 AM | #5 |
Second Lieutenant
5
Rep 243
Posts |
On a related note, there is an ad for the Regal GS where it is shown "ticking" on the driveway after some fun driving.
That's just the car cooling off. |
Appreciate
0
|
05-16-2012, 01:13 AM | #6 | |
✚
102
Rep 1,237
Posts |
Quote:
|
|
Appreciate
0
|
05-16-2012, 01:18 AM | #7 |
Second Lieutenant
5
Rep 215
Posts |
Some of the ticking has to do with the exhaust components cooling which get really hot, especially the catalytic convertor. It is designed to do so.
__________________
2012 328i Base, Auto, Melbourne Red
|
Appreciate
0
|
05-16-2012, 06:02 AM | #8 | |
Lieutenant Colonel
351
Rep 1,684
Posts |
Quote:
You might be surprised to know that the car makes virtually the same sounds as it gets warm and expands as you drive off from a cool engine, but you don't usually hear it cause your driving and because the engine is on. This tic tic tic of the engine contracting after power off and tic tic tic of the engine expanding after startup is what precisely makes the start/stop feature a ticking time bomb. The added cycles of expansion and contraction eventually will catch up with the best made engines. Another discernible reason not to use start/stop. |
|
Appreciate
0
|
05-16-2012, 06:07 AM | #9 | ||
Colonel
310
Rep 2,612
Posts
Drives: F30 328i Luxury - Sport Auto
Join Date: May 2011
Location: Lancashire, North West England, UK
|
Quote:
Yep, my 330d tick's on cool off - all my cars have - so no worries!
__________________
Gone: 2006 BMW E60 520d SE 6MT Gone: 2009 BMW E90-LCI 330d SE 6MT Current: 2012 F30 328i Luxury 8AT On Order: 2015 Audi A6 Avant Ultra, Black Edition (sorry!) |
||
Appreciate
0
|
05-16-2012, 07:21 AM | #11 | |
Captain
44
Rep 821
Posts |
Quote:
Time will tell, but I think a lot of people are reaching a bit when it comes to ASS. Maybe if you kept the car for 20 years there would be a difference. |
|
Appreciate
0
|
05-16-2012, 07:24 AM | #12 | |
Second Lieutenant
5
Rep 215
Posts |
Quote:
The exhaust (down pipe, catalytic convertor, various shields) is the culprit as it gets much, MUCH hotter (sometimes red hot) than the engine and much thinner and has hot gasses constantly forced thru it with no cooling. Your turbo may also make also make clicking noises as it gets very hot as well. The catalytic convertor is designed to get red hot to burn off unburnt gasses to decrease emissions. Just look at all of the heat shields around the exhaust. It is also made from thinner metals which are more likely to contract and expand.
__________________
2012 328i Base, Auto, Melbourne Red
|
|
Appreciate
0
|
05-16-2012, 08:37 AM | #14 | |
Private First Class
22
Rep 198
Posts |
Quote:
|
|
Appreciate
0
|
05-16-2012, 10:08 AM | #15 |
Private
26
Rep 72
Posts |
|
Appreciate
0
|
05-16-2012, 01:01 PM | #16 | |
Lieutenant Colonel
351
Rep 1,684
Posts |
Quote:
Is this a new liberal theory that engines don't get that hot? The critical parts of an engine are generally made of the same materials so the rate of expansion is consistent between parts. Different types of gaskets are used when you have different alloys that tend to expand and contract at different rates. You can't visibly see an engine expanding and contracting. But, it is discernible by the noises that you hear when it cools. In fact, an engine has a radiator to help keep the engine operating within normal limits. The radiator does not generate heat. Rather, the radiator gets hot from the heat inside the engine. Combustion generates heat. |
|
Appreciate
0
|
05-16-2012, 02:09 PM | #17 | |
Second Lieutenant
5
Rep 215
Posts |
Quote:
If you don't believe me, use an infrared thermometer. In our racing engines, the headers would glow bright red while the engine remained significant cooler. Have you not seen a car with wrapped headers?? It's not for looks. Have you ever been told not to park over dry leaves? It's because the catalytic convertor is so hot that it can ignite them. Heck, look up catalytic convertor on the internet. It explains how hot they get and why they are meant to get that hot. Geez. Oh, and for your radiator comment, yes engines have radiators to keep them cool because they do not run well hot due to all of the moving parts and internal friction. The radiator proves my point, not yours as to what gets really hot.
__________________
2012 328i Base, Auto, Melbourne Red
|
|
Appreciate
0
|
05-16-2012, 07:29 PM | #18 |
Brigadier General
101
Rep 3,566
Posts
Drives: F30 M-Sport 328i Estoril Blue
Join Date: Jun 2005
Location: Melbourne Australia
|
My E90 has been doing it after every drive ever since I bought it back in 2005. No problem.
__________________
328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect, MST turbo intake pipe, MST Cold Air Intake, JB4 on Map 2 with Catless DP produces awesome performance in Sport.
|
Appreciate
0
|
05-16-2012, 08:18 PM | #19 |
Major
32
Rep 1,285
Posts |
|
Appreciate
0
|
05-17-2012, 12:10 PM | #20 |
Major
76
Rep 1,292
Posts |
This is the correct answer. Anyone who has been under the hood working on hot cars can tell you the exhaust system is where this noise comes from.
|
Appreciate
0
|
05-17-2012, 12:24 PM | #21 | |
Lieutenant Colonel
351
Rep 1,684
Posts |
Quote:
The point is that the ticking sound comes from the engine rather than say a tire or the fender. This generalization is in line with the OP's original post. Nevertheless, after running the engine for a long drive at speed you will hear many tics and tocs with your head in the engine compartment after shutdown. The exhaust is only one source and not the only source. The radiator is another source and not the only source. |
|
Appreciate
0
|
05-17-2012, 01:29 PM | #22 | |
Major
76
Rep 1,292
Posts |
Quote:
The OP offered he thought it was coming from the "engine compartment." Myself and others have offered up it is from the exhaust system. My comment is based on years spent working on cars with my head under the hood, or under the car itself on a lift. I have never heard the engine itself or a radiator tick during cool down like the OP described. If you think you have, that's great. If you don't agree, that's fine. But there really is no need for your wise cracks. Have a nice day. |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|