Too restrictive intake?
Thread Starter
|
Intermediate
Joined: Jun 2016
Posts: 48
Likes: 2
From: Massachusetts
Too restrictive intake?
Hi all,
I recently purchased a DK custom 587 intake kit. The filter element is a K&N and came well oiled (red). Install was a breeze and there were no issues.
Now, after about 150 miles, the filter is almost white, slight tinge of pink. It has not been exposed to water or rain. So I am thinking that maybe my bike has sucked the oil out of the element meaning that it is too restrictive and maybe I need a larger intake?
Thoughts? Do you think the DK 636v would be enough?
I recently purchased a DK custom 587 intake kit. The filter element is a K&N and came well oiled (red). Install was a breeze and there were no issues.
Now, after about 150 miles, the filter is almost white, slight tinge of pink. It has not been exposed to water or rain. So I am thinking that maybe my bike has sucked the oil out of the element meaning that it is too restrictive and maybe I need a larger intake?
Thoughts? Do you think the DK 636v would be enough?
Thread Starter
|
Intermediate
Joined: Jun 2016
Posts: 48
Likes: 2
From: Massachusetts
I may be over thinking it.. I have heard of it before but never on my own stuff. If the intake is sucking more air in, than the filter can efficiently provide, it will increase the vacuum in the filter chamber and suck the oil from the media. I didnt mean a larger intake, I meant a larger air filter, my mistake.
I have had a K&N in my truck for over two years and it is still as red as the day I bought it. I cant think of any other reason why the red oil, that is soaked into the element, is no longer there. The unit I took off was a dry element, larger, but ugly and had the stock oil breathers so I changed it to this one with a smaller, wet element. A friend of mine has the larger 606 and has had it since first ride, last year and it is still red like mine was 150 miles ago...
I have had a K&N in my truck for over two years and it is still as red as the day I bought it. I cant think of any other reason why the red oil, that is soaked into the element, is no longer there. The unit I took off was a dry element, larger, but ugly and had the stock oil breathers so I changed it to this one with a smaller, wet element. A friend of mine has the larger 606 and has had it since first ride, last year and it is still red like mine was 150 miles ago...
Seasoned HDF Member
Joined: Jan 2015
Posts: 15,944
Likes: 7,037
From: Sandy Eggo's North County
Depends on "where" the restriction is.
Follow me on this.
A "more narrow" intake path will force the incoming air to increase in velocity. This increase promotes add'l torque in the low to midrange of the rpm scale.
The bad part? That "narrow pathway" virtually strangles the engine in the upper rpm range.
This is why dyno operators give about 75-85% throttle from the beginning of the pull to just before midrange in the rpm. They then go WFO to the redline. It makes for a better hp#.
Now, if the intake restriction is at the filter, then you might need a more efficient filter.
And no, we didn't even get into airbox size/shape or "high pressure" zones...
Follow me on this.
A "more narrow" intake path will force the incoming air to increase in velocity. This increase promotes add'l torque in the low to midrange of the rpm scale.
The bad part? That "narrow pathway" virtually strangles the engine in the upper rpm range.
This is why dyno operators give about 75-85% throttle from the beginning of the pull to just before midrange in the rpm. They then go WFO to the redline. It makes for a better hp#.
Now, if the intake restriction is at the filter, then you might need a more efficient filter.
And no, we didn't even get into airbox size/shape or "high pressure" zones...
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
The red dye in the oil fades when exposed to daylight. The red oil in your car filter is hidden and not exposed to daylight. The oil remains, only the color fades. Happens to every exposed K&N I have ever had. Called K&N about it a few years ago and this is what they told me. No worries.
Trending Topics
Thread Starter
|
Intermediate
Joined: Jun 2016
Posts: 48
Likes: 2
From: Massachusetts
The red dye in the oil fades when exposed to daylight. The red oil in your car filter is hidden and not exposed to daylight. The oil remains, only the color fades. Happens to every exposed K&N I have ever had. Called K&N about it a few years ago and this is what they told me. No worries.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
Ram
General Harley Davidson Chat
2
Jan 27, 2006 01:54 AM