Reason for higher wheel bolt torque for newer Porsches Laz - Friday, 25 April, 2014, at 7:11:29 pm |
Re: Reason for higher wheel bolt torque for newer Porsches Guenter in Ontario - Friday, 25 April, 2014, at 7:57:52 pm |
All the more reason to use anti-seize on the bolt threads. *NM* Laz - Friday, 25 April, 2014, at 8:49:17 pm |
Most likely ... Pedro (Odessa, FL) - Friday, 25 April, 2014, at 10:13:22 pm |
Re: Most likely ... Laz - Saturday, 26 April, 2014, at 9:22:32 am |
What is their source? *NM* grant - Saturday, 26 April, 2014, at 9:17:34 am |
Not cited, but they usually seem to be credible. *NM* Laz - Saturday, 26 April, 2014, at 9:25:42 am |
Well, they advocate taking cars to redline to reduce IMS failures grant - Saturday, 26 April, 2014, at 12:59:40 pm |
Isn't the high revs suggestion based upon oil splash? (Should that occur, rather than cavitation.) Laz - Saturday, 26 April, 2014, at 11:14:40 pm |
Maybe, but as Pedro has demonstrated, that's likely wrong because grant - Sunday, 27 April, 2014, at 12:29:59 pm |
Right on all counts. *NM* Laz - Monday, 28 April, 2014, at 7:08:30 am |
I'm not sure how the oil gets into the bearing. While the engine is off what would... MarcW - Monday, 28 April, 2014, at 12:19:11 pm |
How oil gets in, plus a couple of comments... (good info Marc) grant - Tuesday, 29 April, 2014, at 8:21:01 pm |
Oil feed to the IMS shaft, plus an open bearing... Laz - Wednesday, 30 April, 2014, at 10:02:31 am |
Oh, i think Pedro's is much better. But that was one feature of an interestng solution, whcih... grant - Wednesday, 30 April, 2014, at 6:21:29 pm |
Re: How oil gets in, plus a couple of comments... (good info Marc) Guenter in Ontario - Wednesday, 30 April, 2014, at 10:15:00 am |
Quote
grant
The IMS bearing sits in oil when the engine is off, and in less oil when it is on ( and oil is sucked up out of the sump).
When it spins rapidly it is essentially in *no* oil bath, as Pedro has shown.
Oil gets into the bearing when it sits, and some may get in when the rpms are low. Its not forced in, it just seeps (or flows in an open bearing).
Grant
The bearing sitting in oil is another reason to change the oil more often than not. *NM* Laz - Wednesday, 30 April, 2014, at 1:09:09 pm |
Yup. And another good reason to keep the oil truly full. grant - Wednesday, 30 April, 2014, at 6:23:22 pm |
Re: How oil gets in, plus a couple of comments... (good info Marc) MikenOH - Wednesday, 30 April, 2014, at 3:43:57 pm |
Quote
grant
Another detail that you may find interesting is that the IMS shaft itself is hollow and fills with oil. This oil has, essentially, nowhere to go and therefore sits, trapped and possibly acid, right up against the inner bearing race, possibly making it worse. One company in fact feeds oil to the shaft so it has a slow flow and changes itself.
Grant
Sorry, but based on my experience and observation oil does not run into a spinning bearing... MarcW - Thursday, 1 May, 2014, at 1:29:18 pm |
Quote
grant
The IMS bearing sits in oil when the engine is off, and in less oil when it is on ( and oil is sucked up out of the sump).
When it spins rapidly it is essentially in *no* oil bath, as Pedro has shown.
Oil gets into the bearing when it sits, and some may get in when the rpms are low. Its not forced in, it just seeps (or flows in an open bearing).
Another detail that you may find interesting is that the IMS shaft itself is hollow and fills with oil. This oil has, essentially, nowhere to go and therefore sits, trapped and possibly acid, right up against the inner bearing race, possibly making it worse. One company in fact feeds oil to the shaft so it has a slow flow and changes itself.
It was the presence of 7% water in my Boxster's oil found at its first and only oil analysis -- way back in early 2002 -- that prompted me to adapt a 5K mile oil/filter service schedule.
7%, holy moly! My worst ever was just under 2% and my track cars (read this everyone) are/were typically under 0.5% Extended high temps work :-)
While it is true the oil has an additive packet intended to among other things neutralize any acid it can only do so much. The only way to remove this acid is to drain the oil and refill with fresh oil.
Couldn't agree more. note that there is a little known oil parameter called the "TBN" or "total base number" which is pretty much what it sounds like - a measure of how much neutralizing base additive is in the oil and therefore what its capacity is to neutralize acid. I do recall Click and clack postulating that pouring some pepto-bismal in the crankcase might be a net positive (long story).
Grant
Marc, that was Click and Clack. You may be unaware, btu they area comedy show..... *NM* grant - Thursday, 1 May, 2014, at 1:37:30 pm |
Re: Marc, that was Click and Clack. You may be unaware, btu they area comedy show..... grant - Thursday, 1 May, 2014, at 1:40:27 pm |
Here's the theory on how oil gets into the IMS tube... Pedro (Odessa, FL) - Thursday, 1 May, 2014, at 5:34:38 pm |
Not the way it works based on my understanding of the way the iMS is... MarcW - Friday, 2 May, 2014, at 2:15:35 pm |
You have it wrong MarcW ... Pedro (Odessa, FL) - Friday, 2 May, 2014, at 2:44:14 pm |
Quote
MarcW
The tube is hollow and semi-sealed at one end by the IMSB end by the bearing and its seals, but the other end is open and exposed to the crankcase. Any oil that gets into the IMS gets there through the open end. The IMS is partially submerged with the engine off and a proper amount of oil in the engine/sump -- a tech today told me that when he loosens/removes the IMS end flange bolts and flange oil runs out (and I recall the bolts are micro-sealed as they are submerged and can be an oil leak path) -- so I would expect any oil that gets into the IMS to get there via the opposite and open end.
Re: Reason for higher wheel bolt torque for newer Porsches moresquirt - Thursday, 1 May, 2014, at 2:27:57 pm |
Re: Reason for higher wheel bolt torque for newer Porsches moresquirt - Thursday, 1 May, 2014, at 2:29:34 pm |
Re: Reason for higher wheel bolt torque for newer Porsches Guenter in Ontario - Thursday, 1 May, 2014, at 4:11:40 pm |
Maybe higher oil torque will prevent IMSB failures. *NM* Laz - Tuesday, 6 May, 2014, at 5:27:39 pm |
Do you have to wear a toque to torque the oil? *NM* Guenter in Ontario - Tuesday, 6 May, 2014, at 5:45:27 pm |
Oil change answer Guenter in Ontario - Thursday, 1 May, 2014, at 4:19:25 pm |
Quote
moresquirt
Marc/Grant so do u feel that it would be better to change the oil prior to storage rather than after winter storage because of acis build up thru the running season.
Do u think that water build up over the storage season 9 (winter) is a bigger problem than the acis created in the driving season.I only put 6000 miles on car a season
and used to change the oil after the winter because off moisture but now believe that it may be better to change prior to storage and just go for a good hard/ long early spring run
to hopefully burn off the moisture.What are your thoughts on this thx
Re: Oil change answer Gary in SoFL - Thursday, 1 May, 2014, at 5:00:07 pm |
Re: Oil change answer Guenter in Ontario - Thursday, 1 May, 2014, at 8:23:30 pm |
Quote
Gary in SoFL
Hell, just pour the new oil over the engine and chassis for protection from the elements, and drive the poor 6 month orphan
Re: Oil change answer Gary in SoFL - Friday, 2 May, 2014, at 2:13:55 pm |
Quote
Guenter in Ontario
Quote
Gary in SoFL
Hell, just pour the new oil over the engine and chassis for protection from the elements, and drive the poor 6 month orphan
Yup. That might work in Florida where cars rust from top to bottom due to salt in the air. Won't help when the salt is on the ground and cars rust from underneath to top.