wt_know;1007440 said:like that car in jakarta, beijing, india need to change air filter every week. open an air filter shop will be huat liao
MW;1007487 said:I will always take off my pants to fart. Cleaner
davidtch;1007496 said:In Singapore context, 100k - 200k car is very cheap. Can only buy F30 316.
U better go to PML & bang table. My JDM has no issue rev pass 4k RPM.
Mockngbrd;1007461 said:i sell u aircon filter? BMW approved, 1 piece $500. My loss is your gain.
totoseow;1007524 said:yes u r right. times like this. don't want scoop. shud rnd reverse scoops now. or put sponge in scoops
meatypie;1007529 said:haze got quite abit of soot/carbon particulates, so keeps your tyres black.
Go & open the air box. Show us your results. NPNT.meatypie;1007556 said:wah, so serious? relax la. its the lounge. not rocket science lab.
anyway, since you asked pm2.5 means 2.5 micron, in this case particulates smaller than 2.5microns. BMW didn't readily release much information of the particulate sizing they are able to filter, but since its 99% lets take it as virtually all particulates that can cause engine problems are stopped from entering the combustion chamber. They do state that their filters are good for 60,000km-100,000km under normal driving conditions. I am assuming normal driving conditions to mean driving on the autobahn/ubahn...whatever other bahns they have and not driving in the deserts.
So which then begs the question. who knows how much gunk is being trapped in the air filter due to this unprecedented haze issue? And at which time is good to have it changed/cleaned? Assuming even if all particulates are blocked out, the buildup of it would surely decrease airflow into the engines. Which could cause your engines to be not as efficient. Either way, doesn't sound too good.
So as an overly conservative singaporean, I was toying with the idea of changing the air filter when the dust settles (pun intended)...:shhhh:
jinooi;1007577 said:Ok, i'm chill...
for the sake of this discussion...
what is the function of the engine air filter in your car? to keep bigger particles of dust from interfering with the combustion process, right?
how big do the particles have to be before they affect the combustion process? can't be as small as 2.5 microns - the combustion process itself produces carbon particles. this is what you see at the end of your exhaust, more commonly known as soot.
so what is the size of the carbon particles? pretty big, since it can be seen with the naked eye. but for the sake of discussion, let's say they are much smaller.
what is the point of filtering out the haze particles if the engine is producing soot which is much bigger?
another point to note - the amount of air that can pass through a filter is inversely proportionate to its efficacy. this means that the finer the filter, the less amount of air passing through.
the stoichiometric ratio (go google it) is 14.7:1
good luck with installing N95 filters to your car. get ready to see a lot of smoke - your car will be running extremely rich due to oxygen starvation.
you familiar with the saying "using cow knife to kill ant?" - end up killing your car.
what would make better sense is to install N95 filters to the exhaust - to prevent more pollution. but then again that will cause restriction of exhaust, which is another story altogether...