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YOUR RESEARCHCam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
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Suggestion · Original poster
Both Bank 1 and Bank 2 deviations are rock solid (zero change) from idle rpm up to 3K rpm.
Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
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Leading evidence: 'Replace )' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace )' (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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Suggestion · Original poster
- second: at idle speed when rpms saddled down (from throttle off all the way down to idle revs deviations value don't change - they slightly change only when engine gets at steady stable idle rpms)
Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
Replace while engine rpms are decreasing
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Suggestion · Original poster
Variations don’t change while engine rpms are decreasing from 3,000 rpm down to idle – rock stable.
Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
Run 20 minutes and engine oil got
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Suggestion · Original poster
Engine running 20 minutes and engine oil got to 200F before tests.
Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
Test 1: idle 3k rpm idle
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Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
Replace only
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Suggestion · Original poster
- second: at idle speed when rpms saddled down (from throttle off all the way down to idle revs deviations value don't change - they slightly change only when engine gets at steady stable idle rpms)
Cam variations bank 1 – within LN spec but slightly drops on back to idle from 3K rpm
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I would appreciate comments on findings with Duramteric Pro Cam Deviation tests on a 06 997 C2S, 45K miles with superb maintenance history over the whole lifetime. Regularly tracked but never abused with twice a year M1 oil changes and an OCD for proper engine warm up / use and servicing.
Engine running 20 minutes and engine oil got to 200F before tests.
Both Bank 1 and Bank 2 deviations are rock solid (zero change) from idle rpm up to 3K rpm.
Holding 3K rpm for some time (30-ish seconds), followed by full & sudden throttle off with engine speed quickly coming down to idle rpm on its own.
Bank 2 variations values holds steady every time at the same value as it was on the rpm up side.
Bank 1 variations decreases in a very small increment every second test and only when engine is back to stable idle rpms. Variations don’t change while engine rpms are decreasing from 3,000 rpm down to idle – rock stable. Smooth engine speed transition into idle every time.
Here are the numbers:
TEST 1: IDLE 3K RPM IDLE
BANK 1 -3.8125 -3.8125 -3.7500
BANK 2 1.0938 1.0938 1.0938
TEST 2: IDLE 3K RPM IDLE
BANK 1 -3.7500 -3.7500 -3.7500
BANK 2 1.0938 1.0938 1.0938
TEST 3: IDLE 3K RPM IDLE
BANK 1 -3.6875 -3.6875 -3.6719
BANK 2 1.0938 1.0938 1.0938
TEST 4: IDLE 3K RPM IDLE
BANK 1 -3.6719 - -3.6719 -3.6719
BANK 2 1.0938 1.0938 1.0938
More than 20 minutes passed between Test 2 and Test 3 and about a minute between the 1&2 and 3&4. Can upload videos / attach link if anyone would like to see.
Is this level of change (6/100th of a degree or even less) indication of anything known?
Here are the screen shoots. Again, any comment is very much appreciated.
- first: at 3,000 rpm (steady all the time from idle to 3K rpm and kept for 30-ish seconds):
Cam deviations bank 1 value = -3.8125
- second: at idle speed when rpms saddled down (from throttle off all the way down to idle revs deviations value don't change - they slightly change only when engine gets at steady stable idle rpms)
Cam deviations bank 1 value = -3.7500
- third: change in deviations value is so small that you barely can see that the graph line is shifting ever slightly
Arrows pointing moment when Cam deviations bank 1 value dropped down to -3.7813 before finally saddling at -3.7500
This is a source reference. Confirm exact model applicability in the original material.
