7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHM96 GT3/Turbo and Carrera head design differences
Leading reported evidence
Use same casting
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Using the same casting for both sides of the engine is an interesting decision.
Leading evidence: 'Use same casting' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use same casting' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T150451Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
When playing around with the engines, I thought it interesting to see how Porsche took the high cost engine from the GT3 and Turbo and cost reduced it and simplified it for the Carrera. So much so that I put a video together to explain the changes.
MC
Thanks, I was worried it might be a bit dry and factual, but I'm not one for 5 minutes of pointless waffle and I'm interested in the engineering details, both from a performance and a manufacturing/cost point of view.
MC
Enjoyed that geeky 5 mins :floor:
Car manufacturing is for profit lest we forget. But those were obvious benefits to the process with the std carrera engine. Given the displacements are similar what's the key factor that lets the Mezger deliver its horsepower over the C2S motors, revs obviously but is it more efficient because it more complex to make?
There is nothing in the complexity which adds to power, not as far as I can see. The GT3 has better flowing heads, infinitely adjustable inlet cam timing rather than than the two position timing on the Carrera, combined with a better intake and exhaust. All sorts of little bits.
MC
Some significant improvements from a dfm point of view.
Using the same casting for both sides of the engine is an interesting decision. It lengthens the engine a fair amount having two sets of timing chains, but simplifies stock holding and parts ordering. I bet there were some interesting discussions around that particular architecture, but Porsche was in a tight spot back then so savings were paramount. Do the dfi engines have two sets of timing chains?
An m96.01/2/3 without the dual timings setup would have avoided many of the ims issues I am sure.
