Hey guys,
I have been doing some searching and not really finding the answers I am looking for. The next step in the long line of changes I want to do for my street glide is the air cleaning. I was wondering if anyone had done any real flow and dyno testing on the diffrent major air cleaner systmes out there ie. S&S teardrop and stealth, SE varients, PM, Roland Sands, etc...

I know that most systems have the potential to flow more air than the stock motor can use but what about when you start modding. The most I am looking to do is stock 103 motor, woods 777 cams, ported heads, high flow exhaust, and air cleaner.

I love the look of the S&S teardrop but I am concerned about the recess of the system itself leaves a very small space between the cover and the inlet to the throttle body. This can be remedied with the 1" extension kit but at that point are you just looking at what would be equivilent to a SE intake that has been "pushed back" closer to the motor?

I know this is a lot of question and many varieables but any imput would be great.

 

the only head to head testing I am aware of was by Hot Bike about 15 years ago.
So the 80" evo motor

off the top of my head, it was calculated that almost ALL the hi flow air cleaners on the market flowed much more than the motor could ever demand ( 'cause the motor pulls air in-).

These air cleaners were all apples to apples, tested on the same machine, vacuum, humidity, temp etc.-- which is crucial in testing. a manufacturer may only tell "part of the story"

the flow numbers on a CV40 were something like:

no air cleaner 100 CFM
cupped hand 115 CFM
stock 134 CFM
hype charger 150

Ness BS and S/E with K&N 240 CFM

Zippers Performance 380 CFM

if you like math potential airflow at 100% cylinder fill is calculated as displacement x 1/2 rpm

cylinder fill is often more than 100% as a result of exhaust tract tuning and cam choice, sometimes less than 100%

as far as the gap on the S&S, the gap between the valve and the port is smaller so don't worry if that is what you like.
you are still running an essentially stock motor ( displacement and rpms) even with your head work you are not increasing the demand, for air, just the availability



Mike

 

This page shows K&N test results. http://www.knfilters.com/search/prod...x?Prod=RK-3930

 

I have searched and read as much info on this as I could find and the Zippers Max Flow setup is the one I use.

 

Look at the K&N "High Five" filter sold by kuryakyn. It is basically the same filter as the ness and others and made by K&N but the end cap of the filter is filter material also and gives it 40% more flow that any other non end cap filter out there.
This is according to kuryakyn but it doesn't take a brain surgeon to see that adding the filter at the end will be a large increase in air flow.
If I were a betting man, I would bet the High Five filter is the least restrictive filter of any out there.

All that being said though, The Kury A/C back plate is a poor design and causes oil blow by on my bike. but the build quality is ok.

I have to agree with everyone else though, the SE and Ness A/C are more than enough air flow for. I have heard they can handle up to 150 hp and still room for more. Anything on the market just about has more flow than you could ever need so to me it all boils down to fit& finish and function.

The Kury Street Sleeper 2 serves me well but I have my dislikes about it.

 

How would you know how much air your motor needs to be at peak performance? If a filter flows the most air but your engine doesn't need it its kind a over kill right? As I said above I really like the Zippers max flow because you never have to worry about your engine needing more air flow but I'm sure a regular stage 1 filter is all my motor needs.

 

The S&S Single Bore tuned induction works very well.

 

That might be because most of the manufacturers don't want you to know that there's very little difference in air flow between filters (so be very wary of their claims and read the really fine print).

The big bottleneck is the design/function of the air intake from the backplate on down and the maximum amount of air your particular motor can flow. Until that's addressed, very little (if any) is to be gained by changing to some well-known, expensive air cleaner/filter.

So, pick one that looks good to you and be happy with it.