Engine Vibration around 1900 RPM
12-03-2006, 02:47 PM
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Engine Vibration around 1900 RPM
Today, I noticed a slight engine vibration around 1900 RPM. It starts at around 1850 RPM and disappears at about 1950 RPM. It can only be felt when the car is standing still (not when driven) and it occurs with the manual transmission in neutral with depressed and non-depressed clutch pedal. Engine temperature (cold or warm) doesn't affect it either.
The vibration is very small but it can be felt in the seat. The symptom doesn't have to be new - I just never revved up the engine ever so sloooowly to have enough time to actually notice it.
Does anybody else have this symptom, or am I the only one?
I would really appreciate some feedback, because my Porsche dealer is 290 Miles away and I would hate to drive all the way to Albuquerque just to be told that "they all do that".
Greetings Rainer
The vibration is very small but it can be felt in the seat. The symptom doesn't have to be new - I just never revved up the engine ever so sloooowly to have enough time to actually notice it.
Does anybody else have this symptom, or am I the only one?
I would really appreciate some feedback, because my Porsche dealer is 290 Miles away and I would hate to drive all the way to Albuquerque just to be told that "they all do that".
Greetings Rainer
12-03-2006, 06:57 PM
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Originally Posted by CayS
Today, I noticed a slight engine vibration around 1900 RPM. It starts at around 1850 RPM and disappears at about 1950 RPM. It can only be felt when the car is standing still (not when driven) and it occurs with the manual transmission in neutral with depressed and non-depressed clutch pedal. Engine temperature (cold or warm) doesn't affect it either.
The vibration is very small but it can be felt in the seat. The symptom doesn't have to be new - I just never revved up the engine ever so sloooowly to have enough time to actually notice it.
Does anybody else have this symptom, or am I the only one?
I would really appreciate some feedback, because my Porsche dealer is 290 Miles away and I would hate to drive all the way to Albuquerque just to be told that "they all do that".
Greetings Rainer
The vibration is very small but it can be felt in the seat. The symptom doesn't have to be new - I just never revved up the engine ever so sloooowly to have enough time to actually notice it.
Does anybody else have this symptom, or am I the only one?
I would really appreciate some feedback, because my Porsche dealer is 290 Miles away and I would hate to drive all the way to Albuquerque just to be told that "they all do that".
Greetings Rainer
12-04-2006, 11:26 AM
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The next time you service it I'd bring to the Service Managers attention. It 'might' be a faulty engine mount, but who knows. All engines have harmonics.
But I highly doubt it's anything to worry about.
But I highly doubt it's anything to worry about.
12-06-2006, 11:58 PM
#6
why would you rev the the car in neutral?
Thats not a normal occernce in nomral operation, when you do weiid things besides driving your car you may get a weaird response from the car
Thats not a normal occernce in nomral operation, when you do weiid things besides driving your car you may get a weaird response from the car
12-07-2006, 08:56 PM
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Thank you 99firehawk for your insight.
Read my initial post to get the answer.
I also don't think that 1900 RPM can be called "revving the engine" - for a Porsche that's less thn a decent "clutch-drop RPM".
Read my initial post to get the answer.
I also don't think that 1900 RPM can be called "revving the engine" - for a Porsche that's less thn a decent "clutch-drop RPM".
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12-07-2006, 11:58 PM
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Originally Posted by 99firehawk
You state "if I rev the car very slowly in neutral " theres no reason for that
Because they sound sweet? I've done this to every car I've owned that had a good sound, for enjoyment. It's not like it's harmful - sheesh.
If you take a second and read the initial post carefully, you'll see that he was slowly revving in order to diagnose the engine vibration to see if it occured in neutral, to effectively rule out transmission as a source of vibrations.
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Welcome to Rennlist, Rainer!
My intial thought is harmonics also.
The following is Wild Speculation: At that RPM, vibration from the motor is at a frequency that is not dampened by the motor mounts so it spreads out and you feel/hear it. I'll bet there's an engineering team tearing their hair out because they couldn't fix it before the car went into production. It may be a impossible fix, as "re-designing motor mount location and construction" is not exactly a little upgrade. Look for it to be solved with Cayman Generation II.
12-08-2006, 09:00 AM
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Originally Posted by ryanawesome
Its a mechanical device. It will make noises. Stop being a "Luxury car owner" and go out and enjoy being a "Sports car owner"
These are Porsches, not Mazdas. We expect perfection!
12-08-2006, 04:03 PM
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I wonder why it is so hard for some people to stay on the technical level and write a meaningful answer or nothing at all !
Originally Posted by 99firehawk
You state "If I rev the car very slowly in neutral " theres no reason for that
Maybe YOU can't think of a reason, but I had one. I was calibrating the low RPM setting of my "GTech RR" to the Porsche tach and didn't want to do that while I was driving.
Fair enough?
Originally Posted by ryanawesome
Its a mechanical device. It will make noises. Stop being a "Luxury car owner" and go out and enjoy being a "Sports car owner"
Thanks Ryan, this is the 24th car in my life (the last six were sports cars made by Nissan, Lexus, BMW and Mercedes), but your post was definitely mind-opening. So they are indeed mechanical devices, aren't they??
JEC_31: Thank you for the welcome.
I have never had any of my latest cars produce this kind of "engine shaking" vibration at any RPM. However, some Cayman S drivers in other Porsche forums tried it at the red lights and were surprised to find exactly the same symptom; so I guess it is a common issue.
I was really primarily worried about being one of the unlucky Cayman S owners with an undertorqued flywheel getting out of balance.
Greetings Rainer
Originally Posted by 99firehawk
You state "If I rev the car very slowly in neutral " theres no reason for that
Maybe YOU can't think of a reason, but I had one. I was calibrating the low RPM setting of my "GTech RR" to the Porsche tach and didn't want to do that while I was driving.
Fair enough?
Originally Posted by ryanawesome
Its a mechanical device. It will make noises. Stop being a "Luxury car owner" and go out and enjoy being a "Sports car owner"
Thanks Ryan, this is the 24th car in my life (the last six were sports cars made by Nissan, Lexus, BMW and Mercedes), but your post was definitely mind-opening. So they are indeed mechanical devices, aren't they??
JEC_31: Thank you for the welcome.
I have never had any of my latest cars produce this kind of "engine shaking" vibration at any RPM. However, some Cayman S drivers in other Porsche forums tried it at the red lights and were surprised to find exactly the same symptom; so I guess it is a common issue.
I was really primarily worried about being one of the unlucky Cayman S owners with an undertorqued flywheel getting out of balance.
Greetings Rainer
12-08-2006, 04:10 PM
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Originally Posted by Likemystoppie?
...Okay you two.........you go to your corner and you go to your corner..........now COOL off! 
12-08-2006, 04:12 PM
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Originally Posted by CayS
I have never had any of my latest cars produce this kind of "engine shaking" vibration at any RPM. However, some Cayman S drivers in other Porsche forums tried it at the red lights and were surprised to find exactly the same symptom; so I guess it is a common issue.
I was really primarily worried about being one of the unlucky Cayman S owners with an undertorqued flywheel getting out of balance.
Greetings Rainer
I was really primarily worried about being one of the unlucky Cayman S owners with an undertorqued flywheel getting out of balance.
Greetings Rainer
Ooohh - I had forgotten about the undertorqued flywheels. Dang teething problems with new models. I hope that's not it!
Got any pics of your S?
