25 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHYet another 3.0 Engine Rebuild
Leading reported evidence
Replace though
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
It looked like a couple had been replaced though..
Leading evidence: 'Replace though' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'extra duration of the camshafts' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check cam timing, valve clearances' (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
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.
Performed · outcome unconfirmed · Original poster
The silicone was used during assembly last time around.
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 suspect a cause
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.
Suspected cause · Original poster
Definately has a deeper growl to it which I believe is due to the extra duration of the camshafts.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Check cam timing, valve clearances
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 · Original poster
So today I spent a long time double checking cam timing, valve clearances, then fitting valve covers etc..
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 · Original poster
I'm guessing that a previous owner might have had some bandaid work done to replace a couple studs (only the broken ones).
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 · Original poster
We are replacing the stock 8.5:1 pistons for 9.8:1 and also upgrading camshafts with a custom grind sourced through William Knight in the USA, who has designed these and has them manufactured by Webcamshafts.com.
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 · Original poster
It will be interesting to see how this motor performs, as the cam is "more" than a 964 or 20/21 that is commonly used, but the claim is that it will outperform them, even using the CIS.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Coverage and how to read this overview
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.
25 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 1 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Thought I'd post a few pics of an engine I am currently refreshing... not sure if many are interested in this stuff... ??
Pics will basically form a timeline.. Had a few delays waiting for parts but we are on the final stretch now.
Engine ran well, but was leaking a fair amount of oil. We are replacing the stock 8.5:1 pistons for 9.8:1 and also upgrading camshafts with a custom grind sourced through William Knight in the USA, who has designed these and has them manufactured by Webcamshafts.com. It will be interesting to see how this motor performs, as the cam is "more" than a 964 or 20/21 that is commonly used, but the claim is that it will outperform them, even using the CIS. Time will tell.
Check out the before pics...!
yummy!!
See how far the plunger in the chain tensioner is extended?
thanks for the interest!
Some interesting efforts to curb the rocker shafts from leaking... see the "home made rsr seals"????!!
Someone made this spacer for the chain tensioner upgrade.. I guess it worked...
just a tad grimy in there...
None.
It looked like a couple had been replaced though.. I'm guessing that a previous owner might have had some bandaid work done to replace a couple studs (only the broken ones). The top end had been off before, but I don't think the case had been apart before. They marked the cylinder positions incorrectly too..
The silicone was used during assembly last time around. Is it wrong??
Well, it is not something I would do.
I think you will find most PFA members are interested in what you are posting. I've watched several of your original time lapse threads and enjoyed seeing how things come apart and go back together. If I needed an engine rebuild and you were down our way I'd be dropping in for a coffee and a chat, keep up the good work and options for our local Porsche lovers!
Cannot remember the engine type, but it is a big port
From this
TO this
New Headstuds installed
Upgrade to 9.8:1 CIS pistons...
Cylinders recoated to suit.
Time to set cam timing!
Bah.. I didn't take any photos of the cam timing process.. it's pretty boring and there are tonnes of cool videos on youtube showing how.
but, it is done.
Here is something interesting to examine... notice how far the chain tensioner is extended in this pre-disassembly photo...
And then compare to how far it is extended in the bottom, new chain photo.
So today I spent a long time double checking cam timing, valve clearances, then fitting valve covers etc..
And those bloody SSi's.. I hate them! What a pain to have to refit them (I now remember the joys of taking them off!!) At least now they are clean. If you scroll up, you can see the state they were in with so much crud baking on them. Hoping these will last a little longer this time around
Starting to finish this.. I don't really want to add all the CIS parts back to it.. but it won't run without them!
What do you think of the black and gold ?
So while this one is done, I feel this one has turned out really well. I have not driven one of these with a 964 cam or a 20/21 (both common go to options for a stockish motor) but with this custom camshaft, it really does feel good. Bottom end is possibly just a little softer, but from 3500 it really wants to keep going. Obviously, we have not done many kms yet so don't want to rev it too hard but initial impressions are VERY good. Would love to get it on a dyno when it has done some kms.
This motor runs very very smooth. It is fitted with a set of SSi heat exchangers and a Dansk sport muffler.. exhaust note is very sweet.. not obnoxious. Definately has a deeper growl to it which I believe is due to the extra duration of the camshafts. Blipping the throttle has the tacho needle swinging VERY quickly
Nothing wrong with a nicely cleaned up CIS. It looked the business back in the day when everything else was running a pie dish air cleaner and a stinky old carb underneath. When all the plating is up to scratch and The hoses are neat can look cool.
