My cat heat shield rattles like a pig. I had it welded a few years ago but grounding on an aggressive change in camber at a drive entrance put pay to that. The good news is that welding it cures the problem, the bad news is you’ll dislodge it again at some point!
Loud tappet like noises from Engine....
- Thread starter T1berious
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According to BMW's workshop manual that's not true (and also what I've been told by my shop), no run in period is required for these on replacement. I think most just take it relatively easy for a few hundred miles to be on the safe side, 1k is unnecessary.Mangozac said:
By BMW's workshop manual you're referring to TIS/ISTA? I couldn't find any reference to it and unless it specifically says that a run-in period isn't required I wouldn't take it to mean that it isn't.TomK said:
I know the arguments which say that the break-in is unnecessary, but it is recommended by BMW: under SIB 11 04 04 (rod bearing updates for early E46 M3s) it specifically states that a 1200 mile break-in period is required following the correction work. I have two friends who are experienced BMW techs, both E46 M3 owners and they agree that a break-in should be performed.
That said, I do agree that 1200 miles of break-in is certainly overkill but dyno runs are not a casual engine operation so I definitely wouldn't be doing one too soon after the bearing change!
Mangozac said:
Actually you're quite right, the rod bearing recall does indeed specify 1200 miles, I'm not sure where I'm imagining I read what I said, but I definitely can't find it
That said, the bearings in theory should not need running in, but I agree with you that a dyno session so close on from replacement is not a great idea. Maybe 1K miles has already been put on :?
No problem TomK, it happens to the best of us. I've been reading TIS (and now ISTA) for 7 years and I'm still discovering relevant and informative documents in it!
T1berious, leave it until 1000 miles and then report back with your dyno results. I want to dyno mine some time soon!
Oh and in case it wasn't obvious: the break-in instructions for the new bearings are the same as a brand new engine: keep the revs below 5500RPM. Painful, I know!
T1berious, leave it until 1000 miles and then report back with your dyno results. I want to dyno mine some time soon!
Oh and in case it wasn't obvious: the break-in instructions for the new bearings are the same as a brand new engine: keep the revs below 5500RPM. Painful, I know!
Way back when I used to read Performance Bikes there was an interesting article on running in of new engines. They basically took a couple of brand new Yammy R1's - the first they broke in gently as per recommendation and the other they ripped the arse off right from the word go. Following a month of that and the usual oil change, both bikes were tracked relentlessly for a season on exactly the same service schedule before been sent for a dyno run and a full strip down inspection - right down to the last nut and bolt. Result.... absolutely identical. Both bikes showed minimal wear and had power outputs within a couple of percent.
There's no reason to take a risk by not running in I suppose, but real world experiments have proved that the risk of engine damage by not running in are very small indeed.
There's no reason to take a risk by not running in I suppose, but real world experiments have proved that the risk of engine damage by not running in are very small indeed.
bowler said:
Erm the engine was rebuilt. I know the thread has run on a bit (Lordy, in the time of this thread I've test drove 5 cars and bought 1) but there were some pics of tne engine block pretty naked and out of the car.
The final bill was staggering but still cheaper than a Porsche Cayman S
Just for you, my engine block and pistons.
I wish it was a lose spark plug
Spaniarduk
Member
Oh wow! This thread was a like a bad Hitchcock movie! I loved it!! :rofl: i simply could not put my phone down from post 1 to this point. Really, really useful and interesting thread! Albeit at great cost and possibly a few sleepless nights for [ref]T1berious[/ref], . I only got my Z4MR imola red 13 months ago with 24k and from day one I've tried to learn as much as possible about the S54. This thread is a treasure! Thanks to everyone who contributed.
T1berious, that video made my eyes water and made me reach for my wallet for a few small pats! :rofl:
T1berious, that video made my eyes water and made me reach for my wallet for a few small pats! :rofl:
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