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  1. #41
    savageman69's Avatar
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    Quote Originally Posted by HiPeRcO View Post
    Interesting, I wonder where you heard about that
    Lol you of course ha
    Quote Originally Posted by radio-active View Post
    That is interesting actually. I've never heard of that. I understand the theory behind getting the largest portion of the spark front facing the injector -- but has anyone ever seen a demonstrable effect from indexing plugs?

    In theory isn't the fuel mixture pretty well dispersed, compressed, "homogenized" in the cylinder by the time the plug fires?

    Now in the MSX 140 head design it may make more sense than in other engines. The plug comes into the head at a fairly severe angle, I guess the electrode could "shadow" the spark front to some significant extent.

    Thinking about it some more -- wouldn't you want the open portion of the electrode to face the combustion chamber rather than the injector? Just askin' ?

    Spark plug torque spec is 18ft lbs. 30 seems pretty high...

    Hey savageman69... in your pics above, it looks like you are boating in mud. What the heck is that all about? Is that lake/river always that brown?
    Its a river after large rain fall...but it normally is a brown anyways


  2. #42
    savageman69's Avatar
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    i was digging back threw lots of threads and seen someone with the same issue a skipping at WOT....ended up being an injector, im hazarding to guess its the mag injector as it still weeps a bit...and the plug is black. Going to attempt to clean it...soak it and what not see what it does

  3. #43
    Moderator HiPeRcO's Avatar
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    For what its worth, Evinrude explicitly called for plug indexing on the FICHT engines. I do not doubt the personal experience of my esteemed colleague K447 however

    Here is a cool video, those injectors can really get rockin'


  4. #44
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by HiPeRcO View Post
    … Evinrude explicitly called for plug indexing on the FICHT engines. …
    What exactly did they want in terms of ground electrode orientation vs. the Ficht injector’s fuel plume vector?

    Evinrude Ficht would have been outboard engines, which may have completely different cylinder scavenging (and swirl) effects inside the cylinder.

  5. #45
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by HiPeRcO View Post
    … plug indexing on the FICHT engines. … personal experience of my esteemed colleague K447 however

    My guess is that there may well be a (small range of) spark plug index orientation that interferes/worsens the Ficht combustion (for polaris Ficht, anyways) but that most of the time the random angle the plug electrode seats itself at is ‘good enough’ and the engine runs just fine.

  6. #46
    savageman69's Avatar
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    well its winter so no testing...but i did get the injector removed and taken apart...this is what i found, not sure if this is an issue but i swapped it with a spare tip to see what happens.



    also installed bumper strip...brand new 2222 prop and stainless wear ring, new speedo wheel...then cleaned up pump and exhaust exit painted them. Next up the jettrim seat cover when it arrives and some custom paint...i also want to do another full 3 stage buff when i get some good 3m products but over all its coming along nice...oh also changed the ugly reg numbers too








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  7. #47
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by savageman69 View Post
    … injector removed and taken apart...this is what i found, not sure if this is an issue but i swapped it with a spare tip to see what happens.


    The QR code printed on each injector contains the compensation data for that injector.

    Each Ficht fuel injector is pulse flow measured during manufacturing and the results are recorded in the bar code. Changing the injector tip is liable to result in an injector that flows fuel slightly differently from the original tip.

    Whether the flow differences are enough to matter, I do not know. Why not utilize the entire injector that spare tip came from? The bar coded info can be decoded and programmed into your EMM if you decide to continue using the injector.

  8. #48
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    Quote Originally Posted by K447 View Post
    The QR code printed on each injector contains the compensation data for that injector.

    Each Ficht fuel injector is pulse flow measured during manufacturing and the results are recorded in the bar code. Changing the injector tip is liable to result in an injector that flows fuel slightly differently from the original tip.

    Whether the flow differences are enough to matter, I do not know. Why not utilize the entire injector that spare tip came from? The bar coded info can be decoded and programmed into your EMM if you decide to continue using the injector.
    i lack the cable and software to recode the emm at this point..we will see if this helps at all, if not i will change the entire injector. Have to see if it effects fuel mixture by plugs but surely may be better than a twisted up filter that was there before...i also figured it was less likely to be as drastic as putting in a uncoded injector

  9. #49
    MSX 150 guy lives on Mr. GP1800's Avatar
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    There’s a how to on making the cables. It’s a piece of cake. There are several of us who can share the software to change the injector coefficients. It’s really easy to do

  10. #50
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    Quote Originally Posted by Mr. GP1800 View Post
    There’s a how to on making the cables. It’s a piece of cake. There are several of us who can share the software to change the injector coefficients. It’s really easy to do
    thank you i will get some cables made asap

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