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  1. #541
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    Quote Originally Posted by racer View Post
    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.
    Thanks for the heads up,
    I will enlarge the mains a bit more!

  2. #542
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    Quote Originally Posted by Captain75 View Post
    Thanks for the heads up,
    I will enlarge the mains a bit more!
    Btw, How big is a 78d? From what I’ve understod its not .078”!?

  3. #543
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    Ready to hit the water!
    Click image for larger version. 

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  4. #544
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    Capt. Please give us the performance gains with the mods you did. I'm interested to see if the rpms go up with the same setup (prop) as before.
    I have been watching your project from the begining and am always learning. Thanks for sharing!
    Gary
    "12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
    "77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp (in progress)
    "72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored when Viper's done....soon)

    "Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau

    "This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking

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  6. #545
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    With a looper you can do more power with same rev range and/or move the power peak up the rev range

  7. #546
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    Quote Originally Posted by olboatman View Post
    Capt. Please give us the performance gains with the mods you did. I'm interested to see if the rpms go up with the same setup (prop) as before.
    I have been watching your project from the begining and am always learning. Thanks for sharing!
    Gary
    Finally I had the time to try the new looper in the water!
    I was very careful not to mess the motor up, even so I had to feel the throttle response and I can assure you, I was not disapointed! This is a totally different motor the the previous 2.7 Fingerport. I will get back when I have some more time on the water, but first I need to put on a bigger wheel and check the wot timing with these compression numbers.
    Click image for larger version. 

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  9. #547
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    Tomorrow I will fine tune the ignition and the wot timing.
    How much advance is recomended?
    140psi, 91oct.
    Won’t be running above 6600rpms.

  10. #548
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    18 degrees max.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  11. #549
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    25:1 then 40:1 ?

  12. #550
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    I would set that timing around 16. atleast until you get the jetting all figured out, if you end up a little lean +140 compression + heavy boat =bad day, better off safe. I left both of my mod 3l loopers at 16 and they made plenty of power.. Dave

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  14. #551
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    Quote Originally Posted by FMP View Post
    25:1 then 40:1 ?
    Right now running 4% mineral based. It smokes a bit...

  15. #552
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    Quote Originally Posted by olboatman View Post
    Capt. Please give us the performance gains with the mods you did. I'm interested to see if the rpms go up with the same setup (prop) as before.
    I have been watching your project from the begining and am always learning. Thanks for sharing!
    Gary
    A little update, but without any real numbers due to break-in process;
    Today I tried a 22” Raker, a prop I’ve had serious bogging issues with when running the 2.7 f/p powerhead. With this ph it just explodes out of the hole, running 16deg timing advance.
    Click image for larger version. 

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ID:	409567Timing adjust using the Reeves method...
    Click image for larger version. 

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ID:	409568On the lake

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  17. #553
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    Timing needs to be set at 5k under load. They dont all change the same amount.

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  19. #554
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    Nice clean setup.

  20. #555
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    Agree,I'm guessing that waters cooold..

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