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Porsche specialists buying, selling, servicing | 911virgin | Uxbridge

997 Gen. 2 - less prone to bore score & IMS failure?

Y

youngsyr

Montreal
Joined
15 Apr 2014
Messages
605
Hi all,

Just reading the Evo buyer's guide to the 997 (http://www.evo.co.uk/porsche/911/14068/porsche-997-carrera-buying-checkpoints) which says:

The two known issues with the gen-1 (2004-2008) flat-six are scored cylinder bores and the failure of a bearing at the end of the intermediate shaft that drives the camshafts. Both can result in engine failure and a rebuild could cost up to ten grand.

...

Gen-2 cars tend not to be afflicted by the above; same goes for the Turbos and GT models, which use a different engine.
Click to expand...

Is that true? I thought both Gen 1 and 2 were prone to both issues?
 
No, it is correct. The Gen 2 997 is the DFI engine which was totally revised from the M97 engine of the Gen 1.
 
alex yates said:
No, it is correct. The Gen 2 997 is the DFI engine which was totally revised from the M97 engine of the Gen 1.
Click to expand...

Thanks! :)

So is that "less prone" as in "nothing to worry about", or "less prone" as in, "not as common as in earlier cars, but still worth getting a boroscope done pre-purchase"? :dont know:
 
Gen2 uses a completely different Direct Fuel Injection engine with no IMS.

Although there has been an extremely small amount (single numbers) reported with scoring (could be harsh driving when cold), In general they are bullet proof.

This is one of the reasons why the Gen2 cars are more expensive.
 
Les said:
Gen2 uses a completely different Direct Fuel Injection engine with no IMS.

Although there has been a few reported with scoring (which could be down to harsh driving when cold), in general they are bullet proof.

This on one of the reasons why the Gen2 cars are more expensive.
Click to expand...

That's great info, thanks very much! :thumbs:

Now for my bonus question: Am I right in thinking that 997 Gen 2 cabriolets do not come with a separate hard top as standard?
 
I thought they'd sorted the IMS issue with the gen 1 cars.

Yup, no hard top with any 997. Buyers hardly ever fitted them and dealers got fed up with them hanging about in storage.
 
IMS is much better in the later gen1's. Not sure how many reported failures compared to the earlier one, but a lot better then the 996.2

Thing is with the IMS worries, all you have to do is swap the bearing for a new one with the dust covers removed when you change the clutch and it's cured. 1 hour extra labour and £50.
 
Thanks all, detailed and reassuring answers all around.

Now for some advanced level man maths...!
 
Man-maths on a gen2 is fairly sound because there are relatively few of them in circulation, they're reliable, they have reasonable running costs and they straddle modernity and analogue sports car very well. It all adds up to modest depreciation. Dealer mark up can be significant, but that will amortise across the years the longer you keep it. Good luck :thumb:
 
EVO's comment is a bit misleading as the gen2 has a new and different DFI engine.
 
MaxA said:
EVO's comment is a bit misleading as the gen2 has a new and different DFI engine.
Click to expand...

One recent Evo "buyers guide" actually said that the 997.1 build quality was so bad that Porsche specialist dealers no longer stock them.

Took me some time to wipe the cornflakes off my breakfast reading...
 
alex yates said:
No, it is correct. The Gen 2 997 is the DFI engine which was totally revised from the M97 engine of the Gen 1.
Click to expand...

and the M96
 
Les said:
IMS is much better in the later gen1's. Not sure how many reported failures compared to the earlier one, but a lot better then the 996.2

Thing is with the IMS worries, all you have to do is swap the bearing for a new one with the dust covers removed when you change the clutch and it's cured. 1 hour extra labour and £50.
Click to expand...

Thats intresting...


My clutch and flywheel were done not too long ago at PI Performance..they never mentioned this..

Also if its as simple as that..labor for clutch change is near £500 i think..would it still not be good to have this done regardless of having it done at clutch change time?
 
SamUK said:
Les said:
IMS is much better in the later gen1's. Not sure how many reported failures compared to the earlier one, but a lot better then the 996.2

Thing is with the IMS worries, all you have to do is swap the bearing for a new one with the dust covers removed when you change the clutch and it's cured. 1 hour extra labour and £50.
Click to expand...

Thats intresting...


My clutch and flywheel were done not too long ago at PI Performance..they never mentioned this..

Also if its as simple as that..labor for clutch change is near £500 i think..would it still not be good to have this done regardless of having it done at clutch change time?
Click to expand...

Original comment is very misleading.

You can have the dust cover removed when changing the clutch - I had this done. At the same time have the bearing looked at.

As for changing it for a "new one" (without taking the engine apart) - it is very risky, and unless you have to have it done, not really advisable.
 
I personally wouldn't change my bearing unless it showed signs of wear. One that's done 50k+ miles IMHO is less likely to FAIL (not wear) than a brand new unproven one.
 
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