Originally Posted By: Virtus_Probi
Originally Posted By: MolaKule
Originally Posted By: HKPolice
The ironic thing about this ad is that calcium additives are known to cause low speed preignition in modern turbo direct injected engines and the Amsoil SS line has over 3500ppm of calcium compared to ~2000 for most other oils.
Only if the calcium component has high volatility.
Modern calcium sulfonates and salicylates have low volatility.
BTW, this goes goes any metallic component that has the potential to produce ash, even ZDDP and MoDTC.
Can the calcium sulfonates and salicylates you mention replace calcium carbonate as a detergent?
LSPI - A KNOCK ON THE NEWEST ENGINES
'A series of papers presented at the JSAE/SAE Powertrains, Fuels and Lubricants International Meeting in Kyoto, Japan in September, indicated that LSPI arises from interactions between lubricants, fuels and engine design/operation. With regard to lubricants, there’s one likely culprit: the CaCO3(calcium carbonate) in the detergent additive.
“We have to find an alternative to CaCO3,” said Yasuo Moriyoshi, professor of mechanical engineering at Japan’s Chiba University. Moriyoshi was co-author of a paper on the calcium contribution to LSPI.'
Also...
https://www.oronite.com/products/lspi.asp
Shedding Light on Low Speed Pre-Ignition (LSPI)
http://papers.sae.org/2014-32-0092/
A Study on the Effect of a Calcium-Based Engine Oil Additive on Abnormal SI Engine Combustion
Paper #:
2014-32-0092
Published:
2014-11-11
