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      12-13-2012, 08:32 PM   #1
kneedeep
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engine sounds a bit like a diesel...does this sound right?

Dealer says it's normal....doesn't sound normal to me.

Does your Z4 35i sound like this? Admittedly it's not as bad in real life as it sounds on the video.

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      12-13-2012, 08:40 PM   #2
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That's the sound of the injectors. Common on direct-injection engines. Perfectly normal.
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      12-13-2012, 08:44 PM   #3
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VERY happy to hear that! I swear my 135i didn't sound like that, but i feel better thanks.
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      12-14-2012, 12:03 AM   #4
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yup, mine sounds like that as well... its the sound of a happy engine that wants to get out and chase after birds in the park
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      12-14-2012, 04:21 AM   #5
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If you think thats bad you should hear the new N20 four pot. That really does sound like a diesel.

My 35i has that injector noise, but you do have to get right up to the engine to hear it. With the bonnet (hood) closed you can hear just a slight ticking.
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      12-15-2012, 09:51 AM   #6
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I have the new 28i Z4 with the 4 cyl engine. Noticed a strange noise in the engine and raised the hood. Sounded bad so I took it to my dealer the next morning. Injector noise was the word. Normal.
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      12-21-2012, 12:45 PM   #7
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Quote:
Originally Posted by kneedeep View Post
VERY happy to hear that! I swear my 135i didn't sound like that, but i feel better thanks.
Think I can explain this one.

Your 135i had the N54 engine and this featured Piezoelectric injectors, which are very efficient and quiet.
The Z4 has the N55 engine and this features Solenoid injectors, which upon inspection aren't as efficient as the Piezoelectric ones. However, I think they lend themselves to more customisation and variability in the spray so they may work out better. Anyway, simply put, the Solenoid injectors are louder than the Piezoelectric ones, hence the more pronounced direct injection ticking noises we are hearing from the N55 35i and N20 28i.
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      12-21-2012, 01:04 PM   #8
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The 20i and 28i have the N20 engine. The 35i and 35is have the N54.

No e89 has the N55.
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      12-21-2012, 01:23 PM   #9
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was just going to say that but you beat me to it.

http://en.wikipedia.org/wiki/BMW_N54
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