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  #1  
Old 7th October 2006
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army_navy army_navy is offline
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Default Difference between stock or SE a/c housing?

Is their a difference between a stock housing, or a SE housing?
If I put a K&N hi-flo filter in the stock ham can, will that be sufficient?
Or, does the SE box actually flow more air?
Have new pipes on, getting ready to do the a/c and carb. Thanks.
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  #2  
Old 7th October 2006
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Quote:
Originally Posted by army_navy
Is their a difference between a stock housing, or a SE housing?
Yes
Quote:
Originally Posted by army_navy
If I put a K&N hi-flo filter in the stock ham can, will that be sufficient?
"Sufficient", Yes. Optimal, No.
Quote:
Originally Posted by army_navy
Or, does the SE box actually flow more air?
Yes
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  #3  
Old 7th October 2006
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Quote:
Originally Posted by gronk62
Yes

"Sufficient", Yes. Optimal, No.

Yes
I would agree with one exception, the SE unit has no ram air where the fctory unit does. The SE unit simply draws air from the 360 degree area behind it wereas the factory unit allows air to be stuffed into the filter area. I took the backing for the factory unit and drill about fifteen 1/2 inch holes in it so not only is the air stuffed into the filter chamber, it's blowing on the right side of the juggs to and this you can feel at speed.
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Old 7th October 2006
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I keep hearing this opinion from Indies, but..

The opening for air into the carb doesnt increase does it?

Has anyone done a quantitative test , like dyno with stock filter cover versus one with a bigger opening, or holes etc?
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Old 7th October 2006
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The stock Harley-Davidson air filter flows 130 CFM at 10”, while the Stage 1 Screaming Eagle flows 160 CFM at 10”. That's about a 25% increase in flow.

The stock cleaner's ONLY opening is that small, forward facing hole in the backing plate/case. I don't know if that really qualifies as "ram" air. The SE filter uses the same cover, but the backing plate doesn't mate with the cover, it is opened all the way around.
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  #6  
Old 7th October 2006
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Quote:
Originally Posted by dagsportster
The stock Harley-Davidson air filter flows 130 CFM at 10ö, while the Stage 1 Screaming Eagle flows 160 CFM at 10ö. That's about a 25% increase in flow.

The stock cleaner's ONLY opening is that small, forward facing hole in the backing plate/case. I don't know if that really qualifies as "ram" air. The SE filter uses the same cover, but the backing plate doesn't mate with the cover, it is opened all the way around.
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He has an '02, you have an '06.
Different style of A/C's. '02 doesn't have that small open facing hole.

I did replace my stock '02 A/C with the SE A/C when I did the Stage 1. Big difference, a very noticeable increase in power with only SE A/C, SE mufflers and rejet. Money well spent.
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Old 7th October 2006
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If ram air actually did anything sufficient, every car, truck or bike would have a ram air design.

Sure, some performance cars over the years used the design, more to try and get denser COLDer air from outside the hood than the warmer air surrounding the motor, but today they've found that isn't even really enough and when they seriously want to make power they also intercool in (run the air through a cooler first).

Ram air is just not all it is cracked up to be.

I will say this though, the stock housing is a lot quieter than the SE, and KYs method might yield better flow with less noise.

On the flip side, I could be wrong, but I THINK The breather tubes on the SE do a better job of getting oil into the intake where it can be drawn and burned as opposed to letting it drip onto the element.

ME, I'm glad I went with the SE AC.

Kev
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  #8  
Old 7th October 2006
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Good discussion and info. I went out and took my a/c cover off. The "ports" where air flows thru the backplate have an area almost three times the area of the throat of the carb. (roughly 5.2 vs 1.8 sq in).
So, it seems to me, the can will allow enough air flow, and any resultant air flow gains would probably rest mostly on the less restrictive K&N.

Thoughts?
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  #9  
Old 7th October 2006
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Quote:
Originally Posted by army_navy
Good discussion and info. I went out and took my a/c cover off. The "ports" where air flows thru the backplate have an area almost three times the area of the throat of the carb. (roughly 5.2 vs 1.8 sq in).
So, it seems to me, the can will allow enough air flow, and any resultant air flow gains would probably rest mostly on the less restrictive K&N.

Thoughts?
Good point. I wonder if a K&N in a stock A/C is better than a SE A/C with the SE filter. (If I remember, K&N doesn't make a filter for the SE A/C.)
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  #10  
Old 7th October 2006
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There is a sufficient difference with the se ac. More air can enter due to the abscence of a enclosed back. But personally I would not waste my money on the SE unit they are crap. For the money you spend on that I would buy a big sucker or the air cleaner from NRHS.
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