Air Cleaner Question
Thanks.
We are not mind readers nor do we have computer vision to see Ur bike.
It will be that way on all Ur questions. U need to put some more information on what U have so we can help U better.
It'd be nice to at least know what yr ur bike is, what motor, FI or carbed, any other work done to Ur motor, like Cams, pipes, and what tuner if U have one.
The amount of air in is directly related to how much air can go out.
If U have stock pipes and heads then Ur motor can only flow so much air depending on Ur pipes and heads.
Ur SE A/C has more than enough air flow capacity for most all but the really big builds.
So by putting a A/C that allows more air flow is just a waste of Money if its nots matched, meaning an A/C can be too big to what Ur motor can process, thereby adding a bigger one will not help any.
Even with open pipes and the biggest A/C out there, Ur heads will then determine how much air flows through Ur motor which is usually less than
most High Perf, A/C.
Here are some numbers I've been able to find -
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Here's the CFM's needed for most street build, found this one in another forum.
CFM= cubic inches x RPM x volumetric efficiency (divided by) 3456
CI = 95 (or whatever motor size you have)
RPM = 6200 (or redline for your motor)
VE = 1 Volumetric Efficiency is normally around 85-90% for a street build, but for sake of easy calculating and over estimating, we can go with 100%.
CFM = 95 X 6200 X 1 / 3456 = 170 cfm
That is the basic formula to figure out CFM needed for any build.
So at most on a 95'' built motor,, it only needs a filter that has 170 CFM, but U need a little more for when it get dirty, say250CFM to be safe.
Lets take a 88''er X 5800 X .85 /3456 = 125CFM --What a stock 88''er has.
For a Stg1 88'er U only need 125 CFM for Ur motor, That why the stock air filter is around 170 CFM, Even dirty it will still handle the motors needs..
So the, SE A/C has 287 CFM and will be over 100% more than enough Air flow.
.
Last edited by oct1949; Oct 12, 2012 at 10:01 AM.
We are not mind readers nor do we have computer vision to see Ur bike.
It will be that way on all Ur questions. U need to put some more information on what U have so we can help U better.
It'd be nice to at least know what yr ur bike is, what motor, FI or carbed, any other work done to Ur motor, like Cams, pipes, and what tuner if U have one.
The amount of air in is directly related to how much air can go out.
If U have stock pipes and heads then Ur motor can only flow so much air depending on Ur pipes and heads.
Ur SE A/C has more than enough air flow capacity for most all but the really big builds.
So by putting a A/C that allows more air flow is just a waste of Money if its nots matched, meaning an A/C can be too big to what Ur motor can process, thereby adding a bigger one will not help any.
Even with open pipes and the biggest A/C out there, Ur heads will then determine how much air flows through Ur motor which is usually less than
most High Perf, A/C.
Here are some numbers I've been able to find -
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Here's the CFM's needed for most street build, found this one in another forum.
CFM= cubic inches x RPM x volumetric efficiency (divided by) 3456
CI = 95 (or whatever motor size you have)
RPM = 6200 (or redline for your motor)
VE = 1 Volumetric Efficiency is normally around 85-90% for a street build, but for sake of easy calculating and over estimating, we can go with 100%.
CFM = 95 X 6200 X 1 / 3456 = 170 cfm
That is the basic formula to figure out CFM needed for any build.
So at most on a 95'' built motor,, it only needs a filter that has 170 CFM, but U need a little more for when it get dirty, say250CFM to be safe.
Lets take a 88''er X 5800 X .85 /3456 = 125CFM --What a stock 88''er has.
For a Stg1 88'er U only need 125 CFM for Ur motor, That why the stock air filter is around 170 CFM, Even dirty it will still handle the motors needs..
So the, SE A/C has 287 CFM and will be over 100% more than enough Air flow.
.
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This is not correct. The air intake has the most effect on the fuel air mix.
But to answer the OP question, if you have a true stage one intake and EFI flash you would be making a big difference force air cleaner because they really don't add a great deal of air volume.
What they may be less good at is adjusting for "hot spots" in in air flow, which are more likely to be produced by exhaust changes on a Harley, since Harleys generally don't have tuned-length intake runners.
Last edited by Warp Factor; Oct 12, 2012 at 07:52 PM.






