15 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCH3.9 Engine Build
Leading reported evidence
Install with custom made fully wet 99
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
They have been fitted with custom made fully wet 99.5mm I.D bore liners.
Leading evidence: 'Install with custom made fully wet 99' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check no tight spots as we went' (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.
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 performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Yes assembly lube used throughout just not seen in these mockups
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Discussions that contain suggestions
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Suggestion · Original poster
Bolts torqued up, i added a few more reps to the sequence and check for no tight spots as we went.
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.
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Suggestion · Original poster
All new bearings, chains throughout and lots of cleaning, measuring and cleaning again prior to assembly.
Set 4032 ali, low expansion, coated skirts and npr ring
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that contain suggestions
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Suggestion · Original poster
Wossner forged piston set, 4032 Ali, low expansion, coated skirts and NPR ring set.
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Suggestion · Original poster
Thought I'd throw up a thread detailing my engine build as a thank you to some of the businesses and members on here and it maybe of some use for others contemplating similar works.
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.
15 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: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Thought I'd throw up a thread detailing my engine build as a thank you to some of the businesses and members on here and it maybe of some use for others contemplating similar works.
I finally have enough parts in hand to make a start and this will be a full refresh at 120k and upgrades that seemed to make sense while the unit was in bits. All new bearings, chains throughout and lots of cleaning, measuring and cleaning again prior to assembly.
Crank, lightweight flywheel, clutch cover and underdrive pulley balanced as a unit to within 1/10th of a gram.
Basic components of the bottom end ready for assembly
Are you sure it clean? Clean it again!
New bearings fitted
Crank in place, bearings pre lubricated
Bolts torqued up, i added a few more reps to the sequence and check for no tight spots as we went. The marks only indicate that that particular bolt has been torqued to final spec
Crank end float checked and bang within spec at 0.15mm
Still waiting on modified engine cases, more next time
:thumb:
Generally the engine was tired and lacked zing...
Top end the valve seat faces were wide and hammered and exhaust valves very shagged and failing
Main bearings, big end bearings and thrust shim all thread bare
Pistons all good but bores becoming oval and quite a lot of blow by going past the rings, though the rings themselves look ok.
Nice one, Thanks Harv. Will definately follow this thread. I'd like to do something like this in the future.
What vintage is the engine for reference?
cheers
Sorry for late reply the engine is a 3.6 from 2002
Time for an update:
I should finally have my modified crankcases back from Serdi next week which will allow me to build up the bottom end. They have been fitted with custom made fully wet 99.5mm I.D bore liners.
The collection of assorted bits continues but here are a few pics which details parts going into the rebuild
Match weighted and balanced end to end rod set with ARP bolts
Wossner forged piston set, 4032 Ali, low expansion, coated skirts and NPR ring set. Again these are matched in weight as a set to within 1/10th gram.
Lightweight single mass flywheel which is a work of art but was still way off the level of balance I'm looking for out of the box, more TLC.
New IMS and cam drive chains
Underdrive pulley
997 GT3 throttle body, note the difference in size?
Next time hopefully some pics of the bottom end going back together after a lot more cleaning.
One thing I'm quite keen to do is get the IMS tube assy itself onto the machine to see if there's any out of balance in it and if that can be improved. I'm not sure if this is something that other engine builders have done/do but something I worth checking.
:thumb:
Wow! How have I missed this!?
What a thread Harv, well documented too!
Are you balancing it all yourself? If so how do you do that, practically?
Subscribed :thumb:
Flywheel is the TTV racing item and I'm impressed at the quality for the price, sourced through Richard at Coordsport
The balancing has been done by David Martin who's a well known Aston Martin engine builder and local to me, they have their own in house developed machine for balancing automotive, marine and aviation engines. He really knows his stuff, not repeatable here is what he thinks of dual mass flywheels :floor:
At the moment I'm trying to find a intake plenum solution for fitting this 997 GT3 throttle body, maybe build something or have a 3D one printed but I don't know anyone off hand :?:
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