That engine crinkling noise after turning car off. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

lupindub · 12-12-2015, 07:41 PM

So i'm been made aware that the crinkling noise your car makes after turning it off after driving is due to the exhaust system in your car rapidly cooling off. If this is the case, how come that "crinkling" noise only comes from the engine bay area? Shouldn't the noise be coming from throughout the car since the exhaust system runs the length of the car?

KR-S · 12-12-2015, 08:01 PM

It has something to do with the metals expanding inside the engine, I think... I don't remember the reason too well.

stugray · 12-12-2015, 08:02 PM

Quote:

Originally Posted by lupindub

So i'm been made aware that the crinkling noise your car makes after turning it off after driving is due to the exhaust system in your car rapidly cooling off. If this is the case, how come that "crinkling" noise only comes from the engine bay area? Shouldn't the noise be coming from throughout the car since the exhaust system runs the length of the car?

The headers and the heat shields around it get the hottest.
About 1 inch from the head the temps easily get 1200F or higher.
From there (and the cats) back it is relatively "cool" compared to that.

RichardsFRS · 12-12-2015, 09:29 PM

All that aluminum and there's a lot is contracting. It will expand over tremendous heat and contract as it cools down. All cars do it

cdrazic93 · 12-13-2015, 02:28 AM

After you warm up your car, the engine expands and the seals & clearances become tighter. When you turn your car off it has to cool down so the sound it makes is a crinkling sound of the engine (& other components) cooling down from a fairly high temp.

12-12-2015, 07:41 PM	#1
lupindub Senior Member Join Date: Jul 2015 Drives: Scion FR-S Location: Michigan Posts: 285 Thanks: 228 Thanked 95 Times in 48 Posts Mentioned: 7 Post(s) Tagged: 2 Thread(s)	That engine crinkling noise after turning car off. So i'm been made aware that the crinkling noise your car makes after turning it off after driving is due to the exhaust system in your car rapidly cooling off. If this is the case, how come that "crinkling" noise only comes from the engine bay area? Shouldn't the noise be coming from throughout the car since the exhaust system runs the length of the car?

12-13-2015, 02:28 AM	#5
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	After you warm up your car, the engine expands and the seals & clearances become tighter. When you turn your car off it has to cool down so the sound it makes is a crinkling sound of the engine (& other components) cooling down from a fairly high temp. __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

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12-12-2015, 09:29 PM	#4
RichardsFRS Senior Member Join Date: Dec 2015 Drives: 2013 Pearl White 6MT Location: Gainesville Ga Posts: 938 Thanks: 5 Thanked 356 Times in 246 Posts Mentioned: 13 Post(s) Tagged: 2 Thread(s)	All that aluminum and there's a lot is contracting. It will expand over tremendous heat and contract as it cools down. All cars do it

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