K&N Crankcase Vent Filters (breathers) - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-21-2011, 11:40 AM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
K&N Crankcase Vent Filters (breathers)

I'm installing a new RamJet 350 in my '55 Bel Air.

The RamJet has a pcv valve that draws from the crankcase under the intake instead of through a valve cover. Therefore, it looks like I need breathers on both valve covers since there are holes for them. One valve cover has 2 holes (one for the oil fill) and the other valve cover has one hole.

Is there an advantage to a K&N (or any brand of filter type breather for that matter) over those standard old chrome type of push in breathers that have been used for years?

It seems to me since breathers will take in air, a filter type will keep more dirt out of the engine than whatever the older type breathers have inside them.

I would appreciate thoughts on this.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-21-2011, 12:12 PM
matts37chev's Avatar
I don't understand?
 

Last journal entry: this is only a test
Last photo:
Join Date: Jan 2009
Location: Shelton,Wa.
Age: 45
Posts: 2,420
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
I do know they look cooler
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-21-2011, 12:31 PM
pepi's Avatar
How’s that hopey-changey thing
 
Last wiki edit: Determining top dead center
Last journal entry: Quicky frame dolly
Last photo:
Join Date: Mar 2005
Location: Georgia ... USA
Posts: 1,835
Wiki Edits: 8

Thanks: 0
Thanked 0 Times in 0 Posts
If you are talking about the vortex heads and a passenger side cover with two holes, here is how I did it. On the driver side I installed the K&N. On the passenger side I took a K&N filter and plugged it with silicone and installed it. The on the rear hole I put the PVC in and hooked it up as you would normally. Thats let you have the best of both worlds, K&N and the PVC fuction.

can be seen here, blue truck
http://www.hotrodders.com/forum/jour...age=5&reverse=
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-21-2011, 12:50 PM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The older chrome style uses a foam insert for filtering air, but they are enclosed within the cap. A K&N type is an open element and will need cleaning maintenance but will last longer than the foam in the cap because the foam will eventually disintegrate with age and petroleum contamination.

I'd go with the K&N.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-21-2011, 01:09 PM
Leoman's Avatar
Registered User
 
Last photo:
Join Date: Jan 2011
Location: leominster ma
Posts: 118
Wiki Edits: 0

Thanks: 5
Thanked 8 Times in 8 Posts
My old-style 355 has breather holes in each cover; I just pop a couple of cheapos in them and replace them every few years. I've never seen any sign of dirt in the motor. Of course, I use no pcv so they both just exhaust the crankcase gases. As far as the air cleaner goes, I use nothing but paper. It doesn't flow much worse than KN or anything else, and it cleans the air much better. Like as in visibly when you look at your carb. Plus no sticky oils. A popular mag ran a test some years back on a bunch of filters for both flow and cleaning capacity. The paper filter was surprisingly close to the fancy reusables on flow, and won the cleaning contest hands-down.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-21-2011, 01:21 PM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
Quote:
Originally Posted by Leoman
My old-style 355 has breather holes in each cover; I just pop a couple of cheapos in them and replace them every few years. I've never seen any sign of dirt in the motor. Of course, I use no pcv so they both just exhaust the crankcase gases. As far as the air cleaner goes, I use nothing but paper. It doesn't flow much worse than KN or anything else, and it cleans the air much better. Like as in visibly when you look at your carb. Plus no sticky oils. A popular mag ran a test some years back on a bunch of filters for both flow and cleaning capacity. The paper filter was surprisingly close to the fancy reusables on flow, and won the cleaning contest hands-down.
I agree with you about the K&N air filters. In tests, they do not filter as well as paper or some other designs.
I do think it is better to use a PCV system and you should consider that. It scavenges the crankcase of contaminates and really has no down side.

Edit:
My RamJet came with a K&N air filter but I am changing it out to this AFE Pro Dry.

Last edited by roger1; 01-21-2011 at 01:28 PM.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-21-2011, 01:25 PM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
Quote:
Originally Posted by sqzbox
The older chrome style uses a foam insert for filtering air, but they are enclosed within the cap. A K&N type is an open element and will need cleaning maintenance but will last longer than the foam in the cap because the foam will eventually disintegrate with age and petroleum contamination. I'd go with the K&N.
Thanks, that is kind of what I was thinking. As I said in my last post, I'm not crazy about K&N air filters but for these breathers, I think they should be a whole lot better than foam enclosed in a cap. And, you can "see" if they are dirty and need maintenance.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-21-2011, 01:39 PM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Leoman
My old-style 355 has breather holes in each cover; I just pop a couple of cheapos in them and replace them every few years. I've never seen any sign of dirt in the motor. Of course, I use no pcv so they both just exhaust the crankcase gases .
I tried that on my engine and all it did was get oil on the valve covers. I couldn't get away without the PCV.

Wow, 50 bucks for a breather x 2? My cheapo's are looking pretty good now!

Last edited by sqzbox; 01-21-2011 at 01:45 PM.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-21-2011, 04:28 PM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
Quote:
Originally Posted by sqzbox
Wow, 50 bucks for a breather x 2? My cheapo's are looking pretty good now!
Naw, I'm looking at these for $20 a piece.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 01-21-2011, 06:49 PM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by roger1
Naw, I'm looking at these for $20 a piece.
That's more my price. Be careful when ordering the grommets. If you get two, the nipple is only .750 in diameter on the breather (3/4 in) so you will need a grommet with 3/4 in inside diameter that will fit the holes on both valve covers. That's about the size of a PCV valve grommet and I believe only one cover has that size hole. the other valve cover hole is larger for the oil fill cap and the breathers don't come with gommets.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-21-2011, 08:53 PM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
Quote:
Originally Posted by sqzbox
That's more my price. Be careful when ordering the grommets. If you get two, the nipple is only .750 in diameter on the breather (3/4 in) so you will need a grommet with 3/4 in inside diameter that will fit the holes on both valve covers. That's about the size of a PCV valve grommet and I believe only one cover has that size hole. the other valve cover hole is larger for the oil fill cap and the breathers don't come with gommets.
The grommets that came with my valve covers are 3/4" ID. So no issue for me there.

Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 01-22-2011, 09:37 AM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
I decided to get 2 of these K&N's instead.
They are a little smaller and the tops come off for easier cleaning.
Same price.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 01-22-2011, 09:54 AM
matts37chev's Avatar
I don't understand?
 

Last journal entry: this is only a test
Last photo:
Join Date: Jan 2009
Location: Shelton,Wa.
Age: 45
Posts: 2,420
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
how do you hide the giant bolt sticking out of the top of it?
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-22-2011, 10:00 AM
roger1's Avatar
©®™
 
Last photo:
Join Date: Feb 2004
Location: San Angelo,TX
Age: 59
Posts: 1,099
Wiki Edits: 0

Thanks: 12
Thanked 6 Times in 6 Posts
You can't hide it.
I went for practicality over looks here.

It does look a little long and it has a nylon insert lock nut.

I figured I could make it look better by cutting a little off the stud if necessary and use a stainless acorn nut on it instead.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 01-22-2011, 11:51 AM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by roger1
You can't hide it.
I went for practicality over looks here.

It does look a little long and it has a nylon insert lock nut.

I figured I could make it look better by cutting a little off the stud if necessary and use a stainless acorn nut on it instead.
Good idea. I'd be thinking about ordering a couple of extra filers being the inserts are cotton. Might be hard to find replacements in a parts store.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
283 crankcase vent BIGWISEXY Engine 11 06-08-2009 07:11 PM
pvc's and breathers? chewyscool Engine 3 12-16-2008 04:13 PM
Crankcase vent or not? curtis73 Engine 20 08-29-2007 01:39 AM
oil comming out og the breathers mac350 Engine 23 06-26-2006 05:07 PM
Which manifold? Breathers? gavinpierce Hotrodding Basics 4 02-16-2006 11:10 PM


All times are GMT -6. The time now is 07:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.