Like Tree0Likes

K & N

Reply
Old 06-16-2003, 05:32 PM
  #1
Toxic FORMULA
Platinum Member
Thread Starter
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default K & N

I have new 540's in my Formula 272 SR1. Finally had a chance to uncork it and found it didn't have what HP500s have in 35 foot boats
Beat my head against the wall along with my engine builder. 3/4 throttle would get me 75/76 mph (GPS). WOT not much more . On the dyno they did 625hp and 702 ft lb tq
After the third time out and I was scrubbing the black soot off the back of the boat it hit me . Reread the boxes my nice K&N filters came in where it shows it flowing 887cfm. Read the real fine print and found that was for a 3 1/2" X 12" filter...not the 2 3/4" X 9" filter found in their 59-0284 "MARINE" filter for a Dominator. So I call them up and start to explain. There answer "Oh yeah , we know thats to small" WTF Why you selling it then? Got some B. S. answer. They said I could PURCHASE a 59-1197 filter assembly but couldn't just purchase the filter. Finally they agreed to exchange filters for the $ difference but I have to send them my existing filters and being on opposite sides of the country , unless I "red label" them. I'm looking at 2 weeks.
Any suggestions for other good flame arrestors??
mopower is offline  
Reply With Quote
Old 06-16-2003, 06:00 PM
  #2
Registered
 
Join Date: Dec 2000
Location: Flemington, N.J. U.S.A
Posts: 2,164
Default

The K&N's are restrictive even if you have the right one ....
Alot of people say they gained lots of speed and power on the dyno by just using the large wire mesh type flame aresters ,and not an actual paper filter . "Excavator" on the board , said he saw drastic difference on the dyno ! You know ,you don't realy see much "dust" out on the water ! Just my .02 JOE
boot is offline  
Reply With Quote
Old 06-16-2003, 06:09 PM
  #3
Toxic FORMULA
Platinum Member
Thread Starter
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default

Boot,
Notice I said Flame arrestors not filters , I know what you mean about dust on the water
mopower is offline  
Reply With Quote
Old 06-16-2003, 06:55 PM
  #4
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default

Did you try running them with the arrestors off just to see if they were making a negative impact? Another thought that comes to mind is engine room ventilation. Try running with the engine hatch off?

After that, all the normal things come to mind like total advance, jetting etc. What are you running for props and WOT rpm?

Be patient, optimizing takes time and usually some setbacks. My engines will probably be wore out by the time I get done optimizing

BT
blue thunder is offline  
Reply With Quote
Old 06-16-2003, 10:29 PM
  #5
Toxic FORMULA
Platinum Member
Thread Starter
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default

OK , feel free to jump in here
Come on Bobby Daniels...No words of wisdom
mopower is offline  
Reply With Quote
Old 06-16-2003, 10:30 PM
  #6
Platinum Member
Platinum Member
Trade Score: (1)
 
KAAMA's Avatar
 
Join Date: Oct 2000
Location: Western Michigan
My Boats: A boat?....What boat??? How about a galvarnized warsh tub wit a toranady strapped own da rear!
Posts: 4,329
Default

When I had my 540's on the dyno, we picked up 3hp going from an "open" carb to the K&N air filter with the reddish paper element in it. Can't remember the part number on my K&N filters, but they are about 8-9 inches tall.

So you guys are saying NOT to use the K&N paper element filter---and that I would get better results without them? Thanks
KAAMA is offline  
Reply With Quote
Old 06-16-2003, 10:37 PM
  #7
Registered
 
formula31's Avatar
 
Join Date: Mar 2001
Location: ohio
My Boats: 1988 Cruisers 2800 Rogue
Posts: 2,558
Default

Ah ha, maybe thats where the power went on one of my engines with the KN on it. Ill have to take it off and see what happens.
formula31 is offline  
Reply With Quote
Old 06-16-2003, 11:07 PM
  #8
Toxic FORMULA
Platinum Member
Thread Starter
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default

Kaama,
K&N sells a #59-0284 for a dominator carb that has a 2 3/4" X 9" filter for a Dominator. That doesn't flow enough for a 540. Worst part is they know it and even admitted that to me. That only flows about 568 cfm , you 8 or 9 incher should flow 3X that. That's fine but I'll bet it doesn't have a USCG number on the filter element itself. According to K&N they only sell a 2 3/4 " and a 5" high marine filter
A 540 @ 5000 rpm requires about 780 cfm and about 830 @ 5500rpm. Depending on compression , cam size and volumetric efficiency perhaps a little more. You should be fine with yours
I don't have 8 or 9 inches , if you know what I mean.

Last edited by mopower; 06-16-2003 at 11:13 PM.
mopower is offline  
Reply With Quote
Old 06-17-2003, 07:10 PM
  #9
Toxic FORMULA
Platinum Member
Thread Starter
 
mopower's Avatar
 
Join Date: May 2002
Location: pitman nj
My Boats: 1989 Formula SR-1 272 t/540's
Posts: 4,238
Default

OOOOOOOOOOOOOOOkay ,
Got some big azz arrestors from Eddie Marine. Sez I can suck the engine hatch through them....well . You get the point

5" X 10"
Attached Images
 
mopower is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bhyatt
TN Powerboat Club
18
10-14-2008 11:33 PM
SUPER AIR
General Boating Discussion
10
08-24-2006 07:47 AM
Strip Poker 388
General Q & A
4
02-13-2004 08:34 PM
Toffen
General Q & A
0
02-02-2003 02:17 PM
Secret F233
General Boating Discussion
10
08-08-2002 06:37 PM



Posting Rules
You may not post new threads
You may not 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



All times are GMT -5. The time now is 04:59 PM.


Copyright 2011 OffShoreOnly. All rights reserved.