What happens if engine takes in more air than ...

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Jan 23, 2019 | 09:37 AM

#11

BobRR

Thread Starter

Road Master

Joined: Mar 2018

Posts: 804

Likes: 92

From: Texas

Quote:

Originally Posted by Noisy Cricket

A "high flow" air cleaner is a lot like "clean Coal". The throttle body size regulates the air flow into your engine. If you have to much air flow....you have a turbo!

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?

Jan 23, 2019 | 09:37 AM

#12

Jackie Paper

Seasoned HDF Member

Joined: Mar 2010

Posts: 38,416

Likes: 6,366

From: Honah Lee

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

Jan 23, 2019 | 10:21 AM

#13

Mattbastard

Grand HDF Member

Joined: Nov 2009

Posts: 4,315

Likes: 1,663

From: Tampa

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.

Jan 23, 2019 | 10:22 AM

#14

skratch

Seasoned HDF Member

Joined: Jan 2007

Posts: 20,616

Likes: 4,440

From: anacoco, la

Quote:

Originally Posted by BobRR

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.

Jan 23, 2019 | 10:30 AM

#15

Noisy Cricket

Road Warrior

Joined: Nov 2017

Posts: 1,593

Likes: 367

From: Northern MN

Quote:

Originally Posted by BobRR

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!

Jan 23, 2019 | 11:29 AM

#16

Buster217

Road Captain

Joined: Aug 2018

Posts: 587

Likes: 312

From: here n there

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.

Jan 23, 2019 | 11:58 AM

#17

deadhawg

Stellar HDF Member

Joined: Apr 2010

Posts: 2,958

Likes: 1,988

From: CA

Quote:

Originally Posted by Noisy Cricket

A "high flow" air cleaner is a lot like "clean Coal".

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.

Jan 23, 2019 | 12:24 PM

#18

Dynamick

Club Member

Joined: Feb 2013

Posts: 9,788

Likes: 8,668

From: Edmonton, Alberta

Quote:

Originally Posted by BobRR

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.

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Jan 23, 2019 | 01:17 PM

#19

strych9

Seasoned HDF Member

Joined: Aug 2017

Posts: 7,323

Likes: 11,757

From: Omaha,NE

Quote:

Originally Posted by Dynamick

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.