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  1. #151
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    Do you have the big bore carbs?


    TMc

    1984 Allison XR2002
    1987 2.7 Fuel Injected Evinrude
    16" Taylor mid
    Brucato ACU.

  2. #152
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    This might be something Racer could shed some light on . I would think when he was running these engines in MOD-VP that he had to run close to stock porting maybe he could tell us what the limits of these motors are and what max rpm's would be.


    TMc

    1984 Allison XR2002
    1987 2.7 Fuel Injected Evinrude
    16" Taylor mid
    Brucato ACU.

  3. #153
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    I have the mid bore carbs. I may have to send him or Sam a private message to get some help.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  4. #154
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    Quote Originally Posted by racer View Post
    As to peak output on a stock 2.7 depends on how close it is jetted/timed, when I ran MODVP with a 2.7 peak output was at 6700 but it was on the edgeand had open exhaust, it also varies from engine to engine. Rarely have I seen peak below 5800 or over 6200 but I have seen it.
    From another post.

  5. #155
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    Thanks. I saw that post, but he only says the exhaust is opened up. Nothing about the intake side. I think the intake side is where a lot of the problem is.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  6. #156
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    Quote Originally Posted by NosBoss View Post
    I drilled the limiter on my stock packs and it hits a wall at 6500-6600. That's a 200-300 rpm increase from before. I've been following this thread to try and figure out how to get mine to pull that high without finger ports.
    It is all about time vs area... Althought I think I've read somewhere that many small ports promotes higher gasspeeds than few ports with same area!? There are plenty of programs out on the internet, programs that help calculating these things

  7. #157
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    Quote Originally Posted by NosBoss View Post
    Thanks. I saw that post, but he only says the exhaust is opened up. Nothing about the intake side. I think the intake side is where a lot of the problem is.
    Im pretty sure what he meant by exhaust opened up was a snout on the mid or gearcase relieved.

  8. #158
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    Quote Originally Posted by Captain75 View Post
    It is all about time vs area... Althought I think I've read somewhere that many small ports promotes higher gasspeeds than few ports with same area!? There are plenty of programs out on the internet, programs that help calculating these things
    There are plenty of programs on the net to find target rpm MPTA/displacement. The problem is knowing what target rpm to port it to. What I mean is I roughly mapped out a stock 225 oceanrunner exhaust port, the target rpm was around 4800 for ideal MPTA/displacement, but it would turn a 26 offshore 7200 on my mirage.

  9. #159
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    Quote Originally Posted by wanagofass View Post
    Im pretty sure what he meant by exhaust opened up was a snout on the mid or gearcase relieved.
    Ahh, that makes sense. Didn't even cross my mind.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  10. #160
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    Quote Originally Posted by wanagofass View Post
    There are plenty of programs on the net to find target rpm MPTA/displacement. The problem is knowing what target rpm to port it to. What I mean is I roughly mapped out a stock 225 oceanrunner exhaust port, the target rpm was around 4800 for ideal MPTA/displacement, but it would turn a 26 offshore 7200 on my mirage.
    when I look at the cylinderbore and the ports, my sense is that one way to higher output is widen the boostport window and transferduct. However I don't think its possible to create an equal amount of area as fingerports would create...
    I will look it up further when I get home this evening as I'm interested in this mod myself, the reason of my interest is that I don't want to carve fingerports, due to thin casting and the pistonring stop problem.

    another thing; I have a friend with a lasercutting machine, he said he could cut me thinner headgaskets to up compression... How thin gasket(copper) will work on my motor before I will have leaking problems?
    Last edited by Captain75; 12-19-2013 at 11:57 AM.

  11. #161
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    Quote Originally Posted by Captain75 View Post
    when I look at the cylinderbore and the ports, my sense is that one way to higher output is widen the boostport window and transferduct. However I don't think its possible to create an equal amount of area as fingerports would create...
    I will look it up further when I get home this evening as I'm interested in this mod myself, the reason of my interest is that I don't want to carve fingerports, due to thin casting and the pistonring stop problem.

    another thing; I have a friend with a lasercutting machine, he said he could cut me thinner headgaskets to up compression... How thin gasket(copper) will work on my motor before I will have leaking problems?
    Your pissin up hill into the wind.............

    If your worried, buy a junk oven, pull the sleeves cut the fingers go down the road.......
    Last edited by 6Killer; 12-19-2013 at 10:59 PM.

  12. #162
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    Click image for larger version. 

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  13. #163
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    Quote Originally Posted by phil blomquist View Post
    Click image for larger version. 

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    nice pics!
    no piston ring stops in the fingerport area... Which pistons?

  14. #164
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    Wisco Pistons

  15. #165
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    Quote Originally Posted by Captain75 View Post
    nice pics!
    no piston ring stops in the fingerport area... Which pistons?
    Don't be too concerned about the ring pins being in the finger ports. There is a theory (which I am running) you can run the older style piston with the pins in the finger ports as a benefit for keeping the pins cool, and keeping them from coming out. I have not experienced a ring pin problem. You do have to add the holes for the finger ports, but that is not a difficult task.

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