Page 1 of 2 1 2 LastLast
Results 1 to 10 of 14
  1. #1

    taking out the reed stuffer on msx 140

    the reed stuffer is for engines with fuel/air mixture in the carburator...is it nessesary with the stuffer when it is injection ? It is a msx 140 and i want to try giving it som more air with K&N air filter and removal of the reed stuffer.



    what do you think ?


    nr 9 on the picture...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	reed.jpg 
Views:	171 
Size:	63.9 KB 
ID:	238440  


  2. #2
    Connecticut CrazyA's Avatar
    Join Date
    Nov 2005
    Location
    CT.
    Posts
    8,134
    +1
    1,050
    Leave them in. Here's a thread on reed stuffers. Doesn't matter if it's injected or carbed. Also keep in mind that the MSX 140's injection system and related computer controls will not compensate for more air. They run them pretty lean to begin with from the factory. Your best bet is a 2004 rideplate and a six degree pump wedge, unless of course your's is a 2004 already.

    http://www.greenhulk.net/forums/show...uffer-Question

  3. #3
    allright...just the new filters then it is a 03 mod but do you know enyone selling 6 degree wedge ?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,569
    +1
    1,272
    Quote Originally Posted by polaris.msx View Post
    ... It is a MSX 140 and i want to try giving it some more air with K&N air filter and ...
    Improving air flow into the MSX 140 engine will not change the engine power the way you might expect it to.

    The Ficht fuel injection system does not have an air flow sensor, so the EMM does not know you have increased the air flow into the cylinders. That means the fuel injection will not increase fuel delivery to match the increased air flow. So you have more air but not more fuel. That means leaner combustion. These Ficht engines already run fairly lean, so increasing air flow simply makes it more lean.

    There are ways to improve MSX 140 power and speed, but changing the air intake system is not helpful.

    Click on my signature links. There is info on how to improve the MSX 140.

  5. #5
    i know that the EMM does not compensate for better air flow, but that is not a problem ? more air, less fuel= better ignition=higher rpm :P ? better air flow and getting rid of the exhoust resonator will give a bit higher rpm ?

    thanks

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,569
    +1
    1,272
    Leaner combustion = higher piston temperatures = melted pistons

    Removing restrictions on either intake or exhaust changes air flow through the engine.

    How will you know how much change is OK, and how much is too much (too lean)?

  7. #7
    Connecticut CrazyA's Avatar
    Join Date
    Nov 2005
    Location
    CT.
    Posts
    8,134
    +1
    1,050
    Quote Originally Posted by polaris.msx View Post
    more air, less fuel= better ignition=higher rpm ? better air flow and getting rid of the exhoust resonator will give a bit higher rpm ?

    thanks
    No, No, No....

    more air, less fuel = higher temps = damaged engine internals =

  8. #8
    as long as the engine runs fine with the amount of fuel it is getting now, it wont hurt giving it more air, because the fuel and oil amount stays the same, then the temperature and lubrication will not be changed ?

    but if i had a carburetor and gave it less fuel and more air...then it could be damage :P ? but a engine runs better when it has easy excess to air...

    K447: as long as the spark plugs are black the engine has 1. to much fuel 2. to little air 3. to much oil :P and the spark plugs are very black and carbonized

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,569
    +1
    1,272
    Quote Originally Posted by polaris.msx View Post
    ... the spark plugs are very black and carbonized
    Then there is something wrong.

    The Ficht system provides a very controlled combustion process. Fuel delivery through the injectors is calibrated to exactly match engine requirements, determined by the TPS signal and air and water temp sensors. Oil injection rate is controlled by the oil pump arm, linked to the mechanical throttle position.

    What spark plugs are you using? NGK PZFR6H are required - no substitutes.

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,569
    +1
    1,272
    Quote Originally Posted by polaris.msx View Post
    as long as the engine runs fine with the amount of fuel it is getting now, it wont hurt giving it more air, because the fuel and oil amount stays the same, then the temperature and lubrication will not be changed ? ...
    More air without more fuel creates higher combustion temperatures.

    Higher combustion temperatures means piston melting.

    Don't confuse these Ficht engines with automotive engines that use a mass air flow sensor. When you improve engine breathing on a car engine that has a mass air flow sensor, the car engine computer sees the increased air flow signal from the air flow sensor and provides more fuel to match. The result is increased power without excessive increase in combustion temperatures.

    The Ficht system does not have any sort of sensor for the air flow. So it does not increase fuel delivery when air flow is increased due to modifications. Which means you get very different results from changing the engine breathing.

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Gonna be taking out the SL780 for its first run after rebuild...
    By hyoctane23 in forum Polaris Open Discussion
    Replies: 5
    Last Post: 03-11-2008, 09:06 AM
  2. taking out the gauge
    By rxpblast in forum Sea Doo Open Discussion
    Replies: 2
    Last Post: 02-11-2008, 08:03 PM
  3. Can I take out the piece under the ...
    By HallPass in forum Yamaha PWC Performance (2-stroke)
    Replies: 16
    Last Post: 01-03-2008, 03:24 PM
  4. What is the Oil need for MSX 140?
    By xsantia in forum Polaris Open Discussion
    Replies: 2
    Last Post: 09-21-2007, 12:41 AM
  5. Draining footwells on MSX-140
    By scott_dc in forum Polaris Open Discussion
    Replies: 3
    Last Post: 07-13-2007, 02:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •