Author Topic: Kohler command head flow numbers  (Read 20963 times)

0 Members and 1 Guest are viewing this topic.

Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #30 on: October 13, 2010, 07:50:51 AM »
I would put the head on and pull the air out of the bottom of the cylinder, just need a large diameter flexible hose to go to the flow bench. Just measure how far the retainer or valve stem opens with a set of calipers or make up some spacers to insert in there that are .100" thick once the clearance is taken out. You'll be using really light springs for the testing.
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /


Offline Rooster

  • Global Pot Stirrer
  • Highly Mowtivated
  • ****
  • Posts: 8255
  • Karma: 73
  • Gender: Male
  • Winning is always fair!!
    • View Profile
    • Cut Loose Racing
Re: Kohler command head flow numbers
« Reply #31 on: October 13, 2010, 04:20:35 PM »
well DUH, go in through the valve covers, lol...I have been staring and staring trying to make something through the lifters! LOL!
Bert stole my cookies!!
 I think he used them to bribe Ed into something naughty?

http://www.cutlooseracing.com


Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #32 on: January 17, 2011, 10:29:11 AM »
I've been sick the last couple weeks with pneumonia so I played with the Kohler heads a little bit. With the heads still being stock appearing on the outside with no welding or filler and stock valve seat still able to use the stock diameter valve (undercut stem) I got the numbers up to 124.1cfm@28 at .600, the cool part is that the flow is 122 at .550". Now its time for some bigger valves and seat work.
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /

Offline Caseracer

  • Turf Warrior
  • **
  • Posts: 242
  • Karma: 1
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #33 on: January 17, 2011, 11:06:38 AM »
Ryan, how does that compare to a Vanny head?

Jack Jones
Hard Case Racing
Shakin' by a Roller Kohler

Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #34 on: January 17, 2011, 01:02:27 PM »
Its funny you should mention that Jack, I actually had to model the bowl area after the 09 and up briggs head to get it to show the bigger numbers, they are big on swirl. After that it didn't like the raised floor.
Its got the briggs head with bigger valves and stock seats  beat by just a few cfm, but I'm not done yet. The calculator says right now the heads are capable of feeding close to 80hp.
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /


Offline FlatheadPuller

  • Turf Warrior
  • **
  • Posts: 967
  • Karma: 12
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #35 on: January 17, 2011, 01:47:24 PM »
Ryan that's what our heads are at with .100 bigger valves and port epoxy in special places. That is with a 25hp head. We have to use stock intakes though. Kinda defeats an all out ported race head.
Dennis Bazzett
Grandville Michigan


Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #36 on: January 17, 2011, 03:20:31 PM »
Yes, the stock intakes are a lot less than desirable, probably the biggest cork for you guys.
 I'm going to try another head after this one with the same bowl area and see just how small I can leave the port opening, then flow it.  But I'm going to keep going on these heads because they will likely end up with two carburetors on an outlaw engine.
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /

Offline denman

  • Newbie
  • *
  • Posts: 3
  • Karma: 0
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #37 on: February 16, 2011, 05:23:11 PM »
I have oversize in my heads but still need to get them to Ryan to flow them. I'm curious how well it will turn out.
Denman 48

Offline strokerwheelhorse56

  • Newbie
  • *
  • Posts: 46
  • Karma: 0
  • Gender: Male
    • View Profile
kiss-Keep It Simple Stupid

Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #39 on: October 08, 2012, 05:40:39 AM »
We have come a long way since this thread was started :D
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /

Offline strokerwheelhorse56

  • Newbie
  • *
  • Posts: 46
  • Karma: 0
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #40 on: October 08, 2012, 09:03:41 AM »
 :lol:
kiss-Keep It Simple Stupid

Offline mcarlson

  • Newbie
  • *
  • Posts: 17
  • Karma: 0
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #41 on: November 15, 2012, 01:51:55 AM »
fordman the heads you were working on were they for a single cylinder motor? im thinking about doing a single cylinder kohler for my f/x build and just seeing what ya have for hop up parts for the kohler single.

Offline Burton for Certain

  • Turf Warrior
  • **
  • Posts: 893
  • Karma: 4
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #42 on: November 15, 2012, 06:29:45 AM »
MidwestsSuper Cub has the go fast parts for the singles. Ryan Kerr can get ya hooked up with head work to get ya running great.
Drew Burton #19 FXS/FXT
Midwest Super Cub Racing

Nichols Performance Inc. For the tractor pulling
"Bad Company" PS/SS
"Triple Play" Open Super Stock Diesel

Small Engines Of Seymour High Performance Camshafts (Greg Hackman) 8125225577

Offline fordman21

  • "The Bandit"
  • Global Moderator
  • Mow-Forum Junkie
  • *****
  • Posts: 1166
  • Karma: 5
  • Gender: Male
    • View Profile
Re: Kohler command head flow numbers
« Reply #43 on: November 15, 2012, 07:49:18 AM »
Those numbers were from a mild twin head, I didn't post any numbers after the serious work was done to them. The single head should really make some high numbers, pretty nice design and some meat there to work with.
For parts, as mentioned Midwest Super Cub has some pretty hard core stuff available for the singles, they are getting into them in a big way......no pun intended lol.
Ryan Kerr  519-332-9532
2007 Troy Bilt Grand National Super Modified Champion.
2008 WOO Outlaw/FXT class Champion.
2008 All American Lawnmower Championsip Outlaw twins champion.
2010 WOO Outlaw/FXT class Champion.
2010 AAMC Twin Outlaw class Champion
2012 USLMRA FX/T National Champion
2012 SRAAUSO FXT Champion<br /