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  1. #526
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    Quote Originally Posted by Captain75 View Post
    Can anyone give me a startingpoint when it comes to idle adjustment of these late model midbores with adjustment screw. Turns?
    when you say late model, what year are they?

  2. #527
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    Quote Originally Posted by powerabout View Post
    when you say late model, what year are they?
    98/99.
    with the idle adjustment screw running through the carb body.

  3. #528
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    2.7 fingerport coming off to make room for the ported 3L closed deck with 2.7 heads
    Click image for larger version. 

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    Attached Thumbnails Attached Thumbnails 911B3CB6-1E6A-42C6-AA73-BA683D773645.jpg  

  4. #529
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    New PH mounted!
    Startup tomorrow
    Click image for larger version. 

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  6. #530
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    Fired right up!
    Click image for larger version. 

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    Last edited by Captain75; 05-21-2018 at 06:39 AM.

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  8. #531
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    Quote Originally Posted by Captain75 View Post
    Are you supposed to screw them in all the way and then back out 5 turns?
    More turns --> More fuel??

    Plumbing again...
    Apart from being way too long, do the blue hose seem to be attached correctly?
    Attachment 407283
    For plumbing on my motor. The blue hose is really a black hose and it is factory bent at 90 degrees and faces down for about 1.5"
    If I don't ask any questions, I'll never learn anything.

  9. #532
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    He has early manifolds with later airbox so he is fine on the hose. Your carbs don't have the inserts for the airbox to hold it in place.

  10. #533
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    I tried to upload a video from my IPhone with some sweet V6 sound, however I’m obviously doing something wrong...
    Here are two pics from the video. The motor has been running two hrs on the hose today, everything seems to work fine, starboard heads feels hotter on your hands.
    Click image for larger version. 

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    Click image for larger version. 

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  12. #534
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    Looks really nice, what kinda compression did you end up with..

  13. #535
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    Quote Originally Posted by Captain75 View Post
    I tried to upload a video from my IPhone with some sweet V6 sound, however I’m obviously doing something wrong...
    Here are two pics from the video. The motor has been running two hrs on the hose today, everything seems to work fine, starboard heads feels hotter on your hands.
    Click image for larger version. 

Name:	D755814F-F679-455A-8D77-B243F984F9BB.png 
Views:	75 
Size:	1.32 MB 
ID:	408133
    Click image for larger version. 

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ID:	408134
    What do you guys think, does the plumbing seem right to you?
    I’ve tried to find a diagram, but no luck...
    Last edited by Captain75; 05-22-2018 at 12:39 AM.

  14. #536
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    Plumbing in photo 1 is wrong. From rear elbow on adapter to bottom of valve, back of valve to heads, front goes overboard. The front fitting on the adapter is an exit on power steering engines and is not used. Do not idle any longer on the hose 2 hrs is already to much. You need to get back pressure on the exhaust and start getting a light load from idle to 1500 and slowly work up.

  15. Thanks Captain75 thanked for this post
  16. #537
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    Quote Originally Posted by racer View Post
    Plumbing in photo 1 is wrong. From rear elbow on adapter to bottom of valve, back of valve to heads, front goes overboard. The front fitting on the adapter is an exit on power steering engines and is not used. Do not idle any longer on the hose 2 hrs is already to much. You need to get back pressure on the exhaust and start getting a light load from idle to 1500 and slowly work up.
    Ok, thanks racer!
    so the plumbing is right, apart from the forward adapter fitting? Should that one be plugged?

  17. #538
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    if you want to run the late air box on the early carbs you just need to press out two of the brass inserts from the late model carbs and slightly enlarge two of the holes in the early carbs and press in the brass inserts. sorry just read and looked at the carbs and realized you are using late carbs.
    1993 Cougar 21ft MTR Superbender SHO

  18. #539
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    Quote Originally Posted by H2OPERF View Post
    Looks really nice, what kinda compression did you end up with..
    Checked today after work.
    Motor cold, not running since yesterday.
    Butterflies closed(forgot...)
    Had to run with all plugs in, Otherwise the starter releases before I get a proper reading?!

    #1: 142
    #2: 137+
    #3: 140+
    #4: 137
    #5: 142+
    #6: 137

    I will start by running mains drilled to .078,
    #26 midrange orfices, 106 pullovers.
    Last edited by Captain75; 05-22-2018 at 03:49 PM.

  19. #540
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    Blew it up to see the rear adapter hose and looks to be going to bottom of valve. The t fitting that has to hose going to front adapter is not used and adapter is plugged on non power steering engines.

    The 98 carbs came stock with a 72D which has about a .075 hole so with the work you have done and heads you are running a jet drilled (dont like) to .078 will most likely be lean at sea level.

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