Quote:
Originally Posted by joff
Yeah, I missed the part where 1 cycle = 2.5 hours and thought it was meant 8 rotations of the rotor which sounded absurd.
This theory could be tested by replacing oil with ashless oil and seeing if a high preignition rate continued. I presume carbon build-up accumulated would not instantly vanish?
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That presumption would be correct (however the carbon instantly vanishing is not necessarily true. It will still need to be burned off, or dieseled to remove the built up carbon, which in and of itself may cause issues with the cars setup). NSU papers did multiple tests. The problem comes with the oil not containing ash, but impurities that produce ash when burned. Hence the high PPM of Calcium causing more sulphated ash, and the respected correlations. VOA and UOA are helpful in narrowing it down to oils that would work stellar in our engines. The problem comes in that a majority of "high end" oils contain low calcium numbers, but those numbers are still too high for our engines (remember the lower the sulphated ash the better; <500ppm of Calcium). Running a pure base, or synthetic that has <<<500ppm of Calcium is the better.
On that note; I did not find VR1 oils at Pepboys in Alexandria, VA. Next time I go to an autoparts store I'll check for it.