944 Rod Bearing Failure - cure ???
#1
944 Rod Bearing Failure - cure ???
I've been told that the #2 rod bearing on the 944 needs to be upgraded.
Can anyone tell me the correct and needed items to be done to the crank.
My understanding is that a secondary oil passage needs to be added to #2 as well as the new bearings.
Can this be done to a hardened crank without loss of durability.?
Would it be as effective to enlarge the existing passages in the crank, new bearings, and girdle?
Thanks in advance for the help.
Can anyone tell me the correct and needed items to be done to the crank.
My understanding is that a secondary oil passage needs to be added to #2 as well as the new bearings.
Can this be done to a hardened crank without loss of durability.?
Would it be as effective to enlarge the existing passages in the crank, new bearings, and girdle?
Thanks in advance for the help.
#3
#4
Originally posted by JJG
http://www.nasaforums.com/viewtopic.php?t=2010
http://www.nasaforums.com/viewtopic.php?t=2010
#5
I put some recommendations in this thread.
https://rennlist.com/forums/showthre...hreadid=119681
There are other as well.
There are no simple "one fix" cures. There ARE things you can do to reduce the risks however.
https://rennlist.com/forums/showthre...hreadid=119681
There are other as well.
There are no simple "one fix" cures. There ARE things you can do to reduce the risks however.
#6
Originally posted by SeaCay
One of the best, comprehensive writings I've seen on this subject yet. Thanks for posting the link!
One of the best, comprehensive writings I've seen on this subject yet. Thanks for posting the link!
Anybody know what sort of modifications to the oil pickup Milledge is talking about? Is it just a ring around the pickup tube?
Or how you could improve baffling? I've seen the Lindsey weld-in baffle but I'm not clear as to where exactly it gets mounted.
thanks
--adrial
#7
Thanks for all the input.......I'm so confused as to the need for oversizing the oil ports, to cross drilling crank, to perpendicular drilling the crank, to baffles in the pan, to just replace bearings every 40 hours, to extra oil, to just running the engine to the max but not over it.
From all this I have come to a few conclusions.
No one knows exactly why the bearing fail.
No one has a specific fix.
Everyone understands the need to keep an eye on the bearings.
And everyone has an opinion, good or bad.
From this I suggest to anyone else that has this same question, that they prepare to change oil often, use Mobil 1 synthetic, utilize an accusump, check oil continuously, change bearings every 30-40 hours, keep revs below 6700, and just run it and have fun. The total cost of trying to fix the problem is more than just maintaining the engine. And if the bearing spins, the cost of a used engine and putting all your goodies on it, is much cheaper in the long run.
Again, thanks for the insight and suggestions from all.
JPII
From all this I have come to a few conclusions.
No one knows exactly why the bearing fail.
No one has a specific fix.
Everyone understands the need to keep an eye on the bearings.
And everyone has an opinion, good or bad.
From this I suggest to anyone else that has this same question, that they prepare to change oil often, use Mobil 1 synthetic, utilize an accusump, check oil continuously, change bearings every 30-40 hours, keep revs below 6700, and just run it and have fun. The total cost of trying to fix the problem is more than just maintaining the engine. And if the bearing spins, the cost of a used engine and putting all your goodies on it, is much cheaper in the long run.
Again, thanks for the insight and suggestions from all.
JPII
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#8
Adrail, the oil pick-up modification is the welding of a collar round it to reduce the possibility of air entrainment. It minimizes the gap between the pickup and the bottom of the sump. The "trap-door" modification can be done a number of ways, but its purpose is to keep the oil from running "up hill" on the right hand side of the sump on left turns. Powerhaus uses a hinged flap, while I have a welded-in divider with a trap door that is normally open but closes on a hard left turn due to the g-force. I think Lindsey Racing sells the parts, and a local shop could weld in the divider. I'll post some pictures when I track down my Rennlist membership number. Is it the cure? No, but it probably helps.
#9
If you find the picture that would be great.
The oil pick up collar? Any thoughts on length? Would it be adventages to extend the tube and allow screened pick-up surface area to stay the same but just lower into the pan?
The oil pick up collar? Any thoughts on length? Would it be adventages to extend the tube and allow screened pick-up surface area to stay the same but just lower into the pan?
#13
Tony... No!
The factory oil pans do have plastic baffles, but nothing like what is being discussed. The factory never resolved the problem and ALL 944 series engines including the 968 Turbo S and 928's have rod bearing issues.
The factory oil pans do have plastic baffles, but nothing like what is being discussed. The factory never resolved the problem and ALL 944 series engines including the 968 Turbo S and 928's have rod bearing issues.