Quote:
Originally Posted by mdm
And cleaners/detergents are a separate issue, they are about preventing/removing carbon buildup in the intake system, especially on intake valves (unless the engine uses direct injection, then of course fuel detergents can't clean the intake valves because the valves do not come into contact with fuel).
Cleaning capability is per se indepent of octane rating, though some brands put more cleaners in their premium (high octane) fuels.
Cleaners/detergents also have no effect on HP, at least not directly. I mean, if there were no or insufficient cleaners, gradually carbon buildup would interfere with engine operation and reduce HP, but that's not the effect the OP has in mind, I suppose.
All gasoline is supposed to contain cleaners, there are standards for that. But - at least in the US - some gas brands set their own higher standards: "Top Tier" gas.
|
Not all direct injection have the injectors only in the combustion chamber. The D-4S system in the 86's have a port injector too. [ame="https://www.youtube.com/watch?v=zc8aUxBZlsU"]2013 Scion FR-S | D-4S Technology Explained - YouTube[/ame]
Cleaners/detergents and other additives do affect hp. The additives doesn't contribute to producing power. Most gasoline around the country is about 97% so you are losing about 6 hp over getting 100% gasoline.