Someone talk me Doc out of buying a 911 (we're famous)
#11
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#12
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White is a great choice - keeps cool & buffs out easy. Red is different and a classic combo. Or a nice saddle tan color. The A7 beige - doesn't look so hot.
Bearing failures - they might temperature related. I have done work on Porsche 928 driveline and if the grease goes dry, or gets toasted = rough bearings.
1. Grease/lube breakdown (worse at high temps)
2. Contamination (water, particulates etc)
3. Improper loading
4. Manufacturing defects
I was serious about IMS. Not sure what mechanism is taking them out, but if it is temp/environmental then Vancouver is the place to be buyin'.
Bearing failures - they might temperature related. I have done work on Porsche 928 driveline and if the grease goes dry, or gets toasted = rough bearings.
1. Grease/lube breakdown (worse at high temps)
2. Contamination (water, particulates etc)
3. Improper loading
4. Manufacturing defects
I was serious about IMS. Not sure what mechanism is taking them out, but if it is temp/environmental then Vancouver is the place to be buyin'.
#13
AudiWorld Wiseguy
The IMS bearing that fails is a sealed greased ball bearing at one end of the IMS. It has no oil feed to it. Over time the bearing seals break down and the grease leaks out of the bearing. Bearing then fails soon after and collapses, sending metal shards around the engine destroying all oil fed bearing surfaces. In extreme cases the IMS itself also fails knocking timing out, instantly destroying the engine. Either way it's a full engine rebuild or replacement.
The turbo, GT2 and GT3 engines don't have this problem as both the IMS bearings are oil fed. Although any GT model is $$$$$$ these days, and turbos are creeping up.
Tons of info out there about which years are affected the most. Although from an outside perspective it seems they never really and truly fixed this terrible cost cutting driven design.
The turbo, GT2 and GT3 engines don't have this problem as both the IMS bearings are oil fed. Although any GT model is $$$$$$ these days, and turbos are creeping up.
Tons of info out there about which years are affected the most. Although from an outside perspective it seems they never really and truly fixed this terrible cost cutting driven design.
#14
AudiWorld Senior Member
Thread Starter
I did do quite a bit of reading on the IMS. ~ Same for the 928 driveshaft, sealed bearings that is. They spec'd metal shields on a 2 or 3x 6006 bearing. Under the heat of the USA climate, the grease leaks & the bearings go south. In contrast I had cars up here in Vanc with way more miles and perfect bearings. Cool temps are good. But 928's are old cars.
I'd be curious to see a plot of mean temp vs IMS bearing failures.
I'd be curious to see a plot of mean temp vs IMS bearing failures.
#15
AudiWorld Member
I always thought it was the RMS [Rear main seal] to look out for on the 996 cars [and even the 997 I heard]. Not sure what IMS is. With the exception of the GT3, I'm not really that interested in water cooled 911s. Wish I still had my 1997 993 although all air coolers are starting to get priced ridiculously and being in Massachusetts I doubt I'll fork over for a Porsche anytime soon.
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I always thought it was the RMS [Rear main seal] to look out for on the 996 cars [and even the 997 I heard]. Not sure what IMS is. With the exception of the GT3, I'm not really that interested in water cooled 911s. Wish I still had my 1997 993 although all air coolers are starting to get priced ridiculously and being in Massachusetts I doubt I'll fork over for a Porsche anytime soon.
#17
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That white 911 pictured is a first gen 997. 911's are rock solid. The ims issue was over blown and effects mainly 996 models. I am on my second 911 and absolutely love them. No other sports car in this class can handle being driven like it was meant to without breaking. I LOVE my 2007 turbo and hope to keep it forever!
#18
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That white 911 pictured is a first gen 997. 911's are rock solid. The ims issue was over blown and effects mainly 996 models. I am on my second 911 and absolutely love them. No other sports car in this class can handle being driven like it was meant to without breaking. I LOVE my 2007 turbo and hope to keep it forever!
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