WhoNew
05-22-2010, 04:33 AM
Original thread
http://forums.bimmerforums.com/forum/showthread.php?t=1449384&highlight=%282+intake+cams%29
Okay, so I was out in the garage today, rebuilding my VANOS, and I decided to do my cam swap as well.
I Have an m50b25TU (VANOS). I left the stock intake cam, and swapped in an intake cam from an M50b25 (NON VANOS) in place of my exhaust cam. Timing was a bit tricky, but I got it.
THE PROBLEM is, It sounds like a diesel truck engine. I am getting all kinds of timing chain rattle. Looking at the head, when the cams are tight, it seems as if the M50NV intake cam is longer than my stock exhaust cam, and it's pushing the chain forward......... making everything rattle......badly. I only ran it for about 5 mins trying to figure out what it was, and the 3rd time i took it apart, I saw the very slight (only a few mm's) difference. I also used the intake cam tray (because it matched the cam) so I'm wondering if that could be the problem. If that is the problem, then I would imagine that the lifters are not centered on the valves either, which would also cause noise.
I know this has been done before, I have read a bunch of threads, but nothing like this in any of them. I really need some help here before I damage my engine. Sorry so long.
Nobody ?
http://forums.bimmerforums.com/forum/showthread.php?t=1449384&highlight=%282+intake+cams%29
Okay, so I was out in the garage today, rebuilding my VANOS, and I decided to do my cam swap as well.
I Have an m50b25TU (VANOS). I left the stock intake cam, and swapped in an intake cam from an M50b25 (NON VANOS) in place of my exhaust cam. Timing was a bit tricky, but I got it.
THE PROBLEM is, It sounds like a diesel truck engine. I am getting all kinds of timing chain rattle. Looking at the head, when the cams are tight, it seems as if the M50NV intake cam is longer than my stock exhaust cam, and it's pushing the chain forward......... making everything rattle......badly. I only ran it for about 5 mins trying to figure out what it was, and the 3rd time i took it apart, I saw the very slight (only a few mm's) difference. I also used the intake cam tray (because it matched the cam) so I'm wondering if that could be the problem. If that is the problem, then I would imagine that the lifters are not centered on the valves either, which would also cause noise.
I know this has been done before, I have read a bunch of threads, but nothing like this in any of them. I really need some help here before I damage my engine. Sorry so long.
Nobody ?