[Pikapolonica]

I've noticed over the past few days my car shudders when turning the engine off.  Is this normal?

Also, still haven't heard back from Hyundai regarding the brake clunking.  Am I likely to hear from them or bring it up at next service (15,000), which for me, won't be that far away.

[Shambles]

I've noticed over the past few days my car shudders when turning the engine off.  Is this normal?

Normal or not, happens with mine too. Just get used to it I reckon

[accim]

Same here.. 

P.S.: "Ladybug" nice nick 

Why does it do it?

I think it is due to the high compression of a diesel engine.  Cut off the fuel and it stops turning over quickly due to the resistance of the compression and jerks to a stop very quickly.

All the diesels I have owned have done the same as have the tractors and buses I have driven over the years.

Am I correct about my  reasoning as to why?

Bob

[Shambles]

I saw a few youtube videos (linked to on my Toyota forum) which demonstrated the operation of the DMF (dual mass flywheel) that modern diesels use to smooth the engine between the long strokes.

As there is a counterbalancing spring that's constantly dampening the stroke change, it could be possible that that spring ceases to be effective during the final few revolutions of the engine, leading to the "shudder"

Just my guess.

[Dazzler]

I saw a few youtube videos (linked to on my Toyota forum) which demonstrated the operation of the DMF (dual mass flywheel) that modern diesels use to smooth the engine between the long strokes.

As there is a counterbalancing spring that's constantly dampening the stroke change, it could be possible that that spring ceases to be effective during the final few revolutions of the engine, leading to the "shudder"

Just my guess.

 

Gee Shambles for a confessed "non-mechanic" thats a pretty good description 

[Shambles]

It's just what I remembered from the youtubes

[Lakes]

Strange , i don't notice my CRDi shudder when i turn off probably cause the only other diesel's i ever drive are trucks and they do the normal diesel simmy shake when they turn off but the i30 just seems to stop, but electronic injection the trucks are mechanical so probably slower to shut fuel off.
maybe your motor idles faster than mine?
i think if your motor idled a bit faster it could happen.
i can't see a problem.

[Pikapolonica]

Same here.. 

P.S.: "Ladybug" nice nick 

Hvala 

[Lakes]

Yesturday i payed more attention, and yes mine does shake when turn it off but it's not very noticible, if i did not pay attention i would not notice. most other diesels i've driven shake more noticibly and you can not ignore it, you always notice, but this is nothing in comparition. does not bother me.
in old days, with carb cars, if they got pre ignition and when you turned them off they kept runing, that was a real pain!
cheers

[LuciferDarklord]

Agree with you guys, most diesels shudder when switching off, I also attribute this to the high CR.

Pikapolonica, is that 'Angel' in your avatar?  My missus is in love with him - I can handle Buffy but his own show is so cheesy I dont know how it got on air to be honest?

[tzwientjuh]

I'm glad I have a petrol 

[Pikapolonica]

Agree with you guys, most diesels shudder when switching off, I also attribute this to the high CR.

Pikapolonica, is that 'Angel' in your avatar?  My missus is in love with him - I can handle Buffy but his own show is so cheesy I dont know how it got on air to be honest?

Yes it is.  Never watched Angel or Buffy.  I love him in Bones.

[reecho]

The i30 has a butterfly valve in the intake that closes when the key is switched off to reduce the shake on shutdown...