997.2 C2 Over Rev Report Advice

joshl · 19 Jun 2024

Hi,

I am looking for some advice. I am in the process of purchasing a manual 997.2 C2. I have had a PPI done which provided the following over rev report:

Range 1 - 4579 ignitions @ 2981h
Range 2 - 489 ignitions @ 2981h
Range 3 - 101 ignitions @ 2926h
Range 4 - 95 ignitions @ 2926 h
Range 5. - 0 ignitions
Range 6 - 0 ignitions
Operating hours - 3044

I am concerned by the 95 ignitions in Range 4 118 hours ago. Presumably this is the result of a missed down shift.

Is this grounds to walk away from an otherwise seemingly good car at a reasonable price?

What are the current over rev rules from Porsche on an approved warranty?

Thanks,
-- Josh

911UK · 19 Jun 2024

Until a few years ago ignitions recorded in ranges 3 and 4 were considered by the Manufacturer to be safe with such vehicles still eligible for Porsche Extended warranty. Ignitions recorded in Ranges 5 and 6 would not be considered for warranty with existing policies invalidated at the point of over rev. Current Porsche warranty procedure ( as of 2020) considers activity in ranges 3 and 4 to be potentially problematic with compression tests and / or oil checks deemed necessary irrespective of whether or not incursions occurred several hundred operating hours prior to the check. However, in a pragmatic relaxation of previous protocol vehicles with activity in ranges, 5 and 6 will be considered for the extended warranty provided the over rev activity occurred more than 200 operating hours ago. The warranty provision is at the discretion of the importer and subject to the aforementioned compression/oil checks.

*** Porsche dealers are advised by the manufacturer to disregard over rev data on all PDK and Tiptronic transmission cars when assessing a car for warranty provision. Consequently, a PDK / Tiptronic vehicle with activity recorded as high as Range 6, assuming all other mechanical checks are passed, will be applicable for warranty*** – Accurate as of 2020.

An operating hour log captures the exact moment when the most recent activity within a given rev range is recorded. The timing of the most recently recorded over rev is as significant as the over-rev itself.

When the engine rev limiter is exceeded the engine can fail or be damaged leaving it susceptible to future failure. Instant failure would normally be caused by valves hitting a piston. Subsequent or delayed failure is often caused by a compromised timing chain which can be weakened or stretched at high engine speeds. If a timing chain were to be excessively stretched failure is possible due to the abrasive effect of a slack chain against the sprocket teeth on which it runs.

Industry experts would suggest a 50 operating hour window of danger after the point of an over rev where chains or associated inter-gear can fail or develop problems leading to costly engine work / engine rebuilds.

via https://911virgin.com/engine-revs/

911UK · 19 Jun 2024

is the car coming from an OPC or private ?

how many miles does it have ?

joshl · 19 Jun 2024

Thanks for this information. The car has just over 70k miles and is being sold by an independent dealer that sells a lot of Porches.

-- Josh

FZP · 19 Jun 2024

If the RR4 are legit, it was in that range for 0.6 secs 120hrs ago. If any issues were to have occurred, you'd think they'd have.manifested by now

Punchdrunked · 19 Jun 2024

I’ll be in the minority and take this from someone that has bought a borescored 997, but I’d walk away from that. Over revs stay with the car for its life, so you’ll be having this conversation if/when you sell. It’s a buyers market out there.

joshl · 19 Jun 2024

FZP, I make it 0.22 to 0.24 seconds, not long, but long enough?

Punchdrunked, a bored scored 997.1 was my original plan, but this seemed like less grief. I'm not so sure now! It doesn't feel like a buyers market (at least for manual 997.2), I've been shopping for a long time and the options are few and far between.

-- Josh

FZP · 19 Jun 2024

My bad, either way, it's probably wouldn't stop me from buying a 997.2 if the rest of the PPE came back clean and ticked all the boxes.

SFH3L · 23 Jun 2024

911UK said:
Until a few years ago ignitions recorded in ranges 3 and 4 were considered by the Manufacturer to be safe with such vehicles still eligible for Porsche Extended warranty. Ignitions recorded in Ranges 5 and 6 would not be considered for warranty with existing policies invalidated at the point of over rev. Current Porsche warranty procedure ( as of 2020) considers activity in ranges 3 and 4 to be potentially problematic with compression tests and / or oil checks deemed necessary irrespective of whether or not incursions occurred several hundred operating hours prior to the check. However, in a pragmatic relaxation of previous protocol vehicles with activity in ranges, 5 and 6 will be considered for the extended warranty provided the over rev activity occurred more than 200 operating hours ago. The warranty provision is at the discretion of the importer and subject to the aforementioned compression/oil checks.

*** Porsche dealers are advised by the manufacturer to disregard over rev data on all PDK and Tiptronic transmission cars when assessing a car for warranty provision. Consequently, a PDK / Tiptronic vehicle with activity recorded as high as Range 6, assuming all other mechanical checks are passed, will be applicable for warranty*** – Accurate as of 2020.

An operating hour log captures the exact moment when the most recent activity within a given rev range is recorded. The timing of the most recently recorded over rev is as significant as the over-rev itself.

When the engine rev limiter is exceeded the engine can fail or be damaged leaving it susceptible to future failure. Instant failure would normally be caused by valves hitting a piston. Subsequent or delayed failure is often caused by a compromised timing chain which can be weakened or stretched at high engine speeds. If a timing chain were to be excessively stretched failure is possible due to the abrasive effect of a slack chain against the sprocket teeth on which it runs.

Industry experts would suggest a 50 operating hour window of danger after the point of an over rev where chains or associated inter-gear can fail or develop problems leading to costly engine work / engine rebuilds.

View attachment 103058

via https://911virgin.com/engine-revs/

Wow. I'd seen chats about the over-rev ranges before, but not seen the actual rpm numbers. 9500 rpm on a 987 would be some downshift!