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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHiccup at 3500 RPM ?
Leading reported evidence
Replace according
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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1
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Performed · outcome unconfirmed
The valve timing and valve profile are continuously changed according to conditions and engine load.
Leading evidence: 'Replace according' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace according' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Run better fuel economy and fewer exhaust emissions
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Suggestion
Key benefits include increased power and torque at all engine speeds as well as smoother running, better fuel economy and fewer exhaust emissions.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T020439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
I have a 06 C2 that runs well, but i have noticed that often, when accellerating, between 3500 -4000 rpm that the engine/transmission seems to slip for a second
I searched, but could not find - apologize if this has been mentioned
Any insight welcome
Variable Cam is kicking in. Happpens at around 3200 RPM on my 02 Carrera
Here's the write up from Porsche AG for the 997:
VarioCam Plus is a remarkably innovative system that continually adjusts the valve timing for optimum performance at all times. Key benefits include increased power and torque at all engine speeds as well as smoother running, better fuel economy and fewer exhaust emissions.
VarioCam Plus combines variable valve timing with two-stage lift on the intake side. The two-stage valve lift function is performed by electro-hydraulically operated switchable tappets. Each of these 12 tappets consists of concentric lifters, which can be locked together by means of a pin. The inner lifter is actuated by a small cam lobe, while the outer ring element is moved by a pair of larger-profile lobes. The timing of each valve is seamlessly adjusted by means of an electro-hydraulically operated rotary vane adjuster located at the head of each intake camshaft.
The valve timing and valve profile are continuously changed according to conditions and engine load. For example, for cold starting and initial responsiveness, VarioCam Plus raises the amount of lift and retards the valve timing. At medium revs and minimal load, the valve lift is lowered and timing advanced to help minimize fuel consumption and emissions. While for maximum power and torque, the lift is raised and the timing advanced.
All operations are controlled by a powerful ECU that manages the engine's operation and makes the appropriate adjustments. On-board diagnostics provide continuous monitoring and early fault detection for the exhaust and fuel supply systems. This results in active prevention of harmful emissions as well as consistent fuel consumption.
