Loud tappet like noises from Engine....
- Thread starter T1berious
- Start date
at what rpm was this video made?
I analyzed the signal with audacity and it turns out that the tick is occuring 9,5 times per second.
So thats roughly 570 per minute.
If the engine is running about 1150rpm its definately valve train related, but if it turns any slower it could be something else.
signal; the tap is clearly visible:
I analyzed the signal with audacity and it turns out that the tick is occuring 9,5 times per second.
So thats roughly 570 per minute.
If the engine is running about 1150rpm its definately valve train related, but if it turns any slower it could be something else.
signal; the tap is clearly visible:
T1berious said:
Nooo.....
Cost of a getting it transported will be magnitudes less than the cost of damage done driving it..
Mike
GuidoK said:at what rpm was this video made?
I analyzed the signal with audacity and it turns out that the tick is occuring 9,5 times per second.
So thats roughly 570 per minute.
If the engine is running about 1150rpm its definately valve train related, but if it turns any slower it could be something else.
signal; the tap is clearly visible:
Nice analysis Guido
Bearing in mind cold start idle is around 1150-1200 and the noise heard you'd have to say it's the cams/followers.
As has been said, do not drive it and I wouldn't even turn the engine on again.
Hope it's not too financially painful op
Car safely back on drive after being transported back home via AA. Will be being recovered by garage on Monday.
But I'm fully prepared for a >1.2k - 2k spend.
the video was at cold idle.
car was gingerly started to get on the drive and that's it.
She'll be back, bright as a button and in rude health!
I'll keep you posted.
Cheers
T1b
But I'm fully prepared for a >1.2k - 2k spend.
the video was at cold idle.
car was gingerly started to get on the drive and that's it.
She'll be back, bright as a button and in rude health!
I'll keep you posted.
Cheers
T1b
How 'cold' is cold start' for an unmodified M?TomK said:
Mine cold idled this morning at about 850-900rpm (i.e. after being sat outside for 36 hours)...for the 10 seconds or so that it was immobile of course
But I’d agree with the majority here, and not drive it until it’s checked/fixed, as a £1k bill is much more preferable than having to replace the engine or fully strip/rebuild it.
mmm-five said:How 'cold' is cold start' for an unmodified M?TomK said:
Mine cold idled this morning at about 850-900rpm (i.e. after being sat outside for 36 hours)...for the 10 seconds or so that it was immobile of course
But I’d agree with the majority here, and not drive it until it’s checked/fixed, as a £1k bill is much more preferable than having to replace the engine or fully strip/rebuild it.
Oh I'm not sure for standard, mine definitely cold starts around 1.2K for a minute or so, maybe that's part of my map but I thought the car did that beforehand, it's been a while though.
I'm in the followers / cams camp. The good news is that the primary failure seems to be the case hardening on the followers, so catching it early and not driving further avoids damage to the cams. If that is the cause, Schrick sell OEM followers to which they apply an additional hardening process. They aren't terribly expensive although I would replace them all. If you need news cams, they are pretty costly and the labour required increases significantly due to the limited access in the Z4M (cf the E46 M3). The job can be done without dismantling the entire front of the car but only by someone who knows what they're doing.
Where are you based? Phil at CPC in Amersham has done this job on several forum cars and many M3s.
Where are you based? Phil at CPC in Amersham has done this job on several forum cars and many M3s.
We'll see,
It was cold for a few hours. mines is stock but I get the feeling that while the work is being done I'll be looking at getting some "preventative" maintenance done.
The car has to last till the mortgage is finished (6 years).
It's a toy car so it will be used for pretty low mileages. in 8 years it's done 40K. Was at the Tesla showroom today. 100D is screaming my name.
Any suggestions on what I should get done (engine wise) at the same time greatly appreciated
It was cold for a few hours. mines is stock but I get the feeling that while the work is being done I'll be looking at getting some "preventative" maintenance done.
The car has to last till the mortgage is finished (6 years).
It's a toy car so it will be used for pretty low mileages. in 8 years it's done 40K. Was at the Tesla showroom today. 100D is screaming my name.
Any suggestions on what I should get done (engine wise) at the same time greatly appreciated
At 91k, changing the bearing shells would be a good idea. I changed mine at 50k and they were pristine, but others have changed them sub-100k and found significant scoring. If they fail, the bill is seriously big bucks. Changing them should be in the high hundreds for parts and labour.
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