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i think i'm starting to warp my head around it thanks again

perhaps what i'm getting at is more along the lines of throttling loses than air filter efficency, any of you guys know a website or book that explain why throttling loses occur?

i agree but what you have done there is starting to talk about how less of a charge gives less power it does not speak to efficiency

Thanks for your time cfromc BSFC (brake specific fuel consumption) That makes extreme sense to me, but the throttling loses still don’t I understand that on the intake stroke any restriction in the airflow will work against the piston trying to pull down but at the same time that same...

really funny dave lol i've never heard THAT one before! not

apparently I’m just going to get flamed but I’ll try again Pablo, what your taking about is how a restriction in air flow will affect power, it does not directly speak to the efficiency problem. What I’m trying to juggle is how a restriction will affect efficiency given that a car meters the...

oh and i did some further digging last night i had no idea that this was such a long lived topic of debate

What I meant is the engine will only allow 4 gpm through @ at certain pressure and rpm and if the filter flow rate is higher in those same conditions there would be negligible pressure drop across the filter. I did not mean that 5 gpm was going across the filter. If 4 gpm is all the engine will...

Thanks for the help in advance guys I hope I can communicate my question clearly enough It’s common knowledge that a dirty air filter causes poor fuel economy. What I can’t rectify in my head the that if your car meters the fuel for the amount of incoming air and that any restriction in the...

ah i had completely ignored the fact that there is a pump bypass as well. so let me take another stab at this at a given viscosity and oil pressure the oil filter will flow 5 GPM but the engine will only allow say 4 GPM so the resultant pressure across the filter would be negligible at best...

Thanks for the response and the welcome So just to be clear, until a filter gets clogged from use the engine represents a far greater restriction to oil flow than the filter itself. If that is the case than why the need to a bypass valve/system? It the engine represents a greater restriction...

I know different sized filters will flow different amounts. has anyone taken one size of filters from different brands and done flow comparisons? I've searched for some time and have only found mentions of "greases study" but cannot find it. Thanks for your time guys thieu

sorry guy i seem to have posted this in the wrong forum Seems like i cannot edit my post / delete it can a mod move it to the air filters section please?

Thanks for the help in advance guys I hope I can communicate my question clearly enough It’s common knowledge that a dirty air filter causes poor fuel economy. What I can’t rectify in my head the that if your car meters the fuel for the amount of incoming air and that any restriction in the...