Your reply actually helps me.

If I have a choice between two styles of high flow air cleaner, which should I pick?

Here are the two choices...

https://www.harley-davidson.com/stor...18-29400246--1

or this

https://www.harley-davidson.com/stor...18-29400299--1

The first choice has less exposed filter surface area but is designed to "ram" air into the throttle body. The second choice has much more exposed filter surface areas. Which is the better filter?

 

I use to blame my sheet risers on breathing. RIP says it's my fondness of pintos, onions and cornbread.

 

The piston will push out all the air it draws in, that's a thermodynamic certainty.

If the exhaust is SO restrictive what'll happen is the piston will be slowed down more trying to overcome the exhaust pressure you'll lose power. Also, as the piston drives up on the exhaust pulse the increased exhaust pressure will force itself out the intake port as soon as that valve cracks open during the overlap, hence power lost there as well. If that's the case the next intake stroke will partially be exhaust from the last exhaust stroke and will inherently draw in less air.

 

which one do you like better? either one is going to flow more than what you need so it all comes down to what you want, budget, etc.

 

Makes absolutely no difference. The only reason to change the A/C is that the designers at Harley came up with the ugliest POS they could find and we change it out of pure embarrassment. I went with the ventilator because it fits closer to the engine and doesn't screw with my legs when I ride. They are ALL overpriced!

 

The only time the air cleaner has any effect on performance is when you are operating at wide open throttle. At less than 100% open it's the throttle that is restricting the air flow not the air cleaner.

 

Don't want to derail the thread, but though precisely controlling the ratio of oxygen to fuel is one factor clean coal technology, filtration on the intake side isn't part of the process.

 

Ram air? No such thing, unless you're talking forced induction. As already stated, you can't make the engine breathe any harder than it needs to in its current configuration and state of tune.

 

You are the first person I've seen say this, besides myself. Ram Air is a great marketing tool for the uninformed.

 

This hypercharger will give you another 10-20 hp.