Molekule was talking about this backin 2004
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1058942
Quote:
I would normally put this into the Interesting Articles thread, but since the topic was brought up here goes:
Detergent additives or agents contribute most of the ash deposits in IC engines. The heavier metals contribute mostly to ash deposits.
The perecent sulfated ash is the ash produced when the detegent is treated with sulfuric acid and burned. All organic material in the detergent burns leaving behind the metal sulfated ash. Sulfate ash results from the reaction of metal compounds with sulfuric acid directly, as with metal hydroxides and metal carbonates, or through the oxidative degradation of the metal sulfonate.
While detergents have the greatest contribution to ash, other compounds also contribute to ash, such as AW agents (ZDDP) and FM's such as MoDTC.
Since the metal compounds can lead to the formation of inorganic metal ashes on combustion, the formulator has to know the metal content of any additive in order to offset the effects of ash (metal) containing additives.
Having said that, there are a number of ashless detergents, and anti-wear and extreme pressure agents being developed as we speak. Many of these ashless additives are based on various phosphor compounds, esters of phosphors, and specialty esters. As others have stated, these compounds will be more expensive, at least initially.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1058942
Quote:
I would normally put this into the Interesting Articles thread, but since the topic was brought up here goes:
Detergent additives or agents contribute most of the ash deposits in IC engines. The heavier metals contribute mostly to ash deposits.
The perecent sulfated ash is the ash produced when the detegent is treated with sulfuric acid and burned. All organic material in the detergent burns leaving behind the metal sulfated ash. Sulfate ash results from the reaction of metal compounds with sulfuric acid directly, as with metal hydroxides and metal carbonates, or through the oxidative degradation of the metal sulfonate.
While detergents have the greatest contribution to ash, other compounds also contribute to ash, such as AW agents (ZDDP) and FM's such as MoDTC.
Since the metal compounds can lead to the formation of inorganic metal ashes on combustion, the formulator has to know the metal content of any additive in order to offset the effects of ash (metal) containing additives.
Having said that, there are a number of ashless detergents, and anti-wear and extreme pressure agents being developed as we speak. Many of these ashless additives are based on various phosphor compounds, esters of phosphors, and specialty esters. As others have stated, these compounds will be more expensive, at least initially.
