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  1. #16
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    Okay, next weekend I will measure my combustion chamber depth, and make my mind up about shaving the head to SST60 spec.
    The thread on BRF is indeed very helpful. Really makes me think I don't want to miss out on the extra hp I get from high compression.
    Also very interesting with the etec reed-cages. Has anybody experience with making them work on the 56ci?
    Otherwise I will just cut my stock cages some, hopefully that works out well.

    Regarding the timing, if I got that right, my max timing won't affect my idle timing, correct?
    For those of you that run a tight head on your engines, did that affect idle in a bad way?

    My order at CCMS is going out next week, is the CDI's rpm limiter at 6700 rpm alright for my application?

    Thank you!

  2. #17
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    I dont think there is an e-tec cage that fits a carby 3 cyl

  3. #18
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    Yeah I wouldn't think they would fit. Anyways, if you Google BRF-56ci OMC realistic power, you will find some info on it. Starts at page 2.
    It might need a custom adapter though.

  4. #19
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    Quote Originally Posted by clubmate777 View Post
    Yeah I wouldn't think they would fit. Anyways, if you Google BRF-56ci OMC realistic power, you will find some info on it. Starts at page 2.
    It might need a custom adapter though.
    3 cyl carby reeds are 3 over 3 the smallest e-tec are 4 over 4 in a 60 vee engine, they are too wide for the crankcase

  5. #20
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    Not true the small 25 30 35 hp etec uses a 3petal cage that bolts right in to the 60 70 omc.

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  7. #21
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    Quote Originally Posted by ChrisCarsonMarine View Post
    Not true the small 25 30 35 hp etec uses a 3petal cage that bolts right in to the 60 70 omc.
    thanks Chris, I didnt know that, can you post a photo?

  8. #22
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    Yes, thats what I read at BRF too. So if we were to compare the etec cages to stock, or opened up stock cages, which one would be the one to have?
    I also read that a reed area can be too big. I wonder where the line is, especially on this OMC.

    Thanks for the input!

  9. #23
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    Quote Originally Posted by clubmate777 View Post
    Yes, thats what I read at BRF too. So if we were to compare the etec cages to stock, or opened up stock cages, which one would be the one to have?
    I also read that a reed area can be too big. I wonder where the line is, especially on this OMC.

    Thanks for the input!
    Too big and squared off is generally an issue that creates poor idle.
    A 3 cyl can certainly do with more read area.
    Chris Carson is your man for all that

  10. #24
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    Thanks powerabout, looking forward to hear from Chris!

  11. #25
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    Here is a little update:

    Reeds: CCMS reeds are on their way. I decided to go with porting my old cages. As far as I understood Chris the reeds will be bigger than steel leafs, so that I can port the cahes and still have enough overlap. Will post pictures when I start.

    Cylinder head: Merc 2.5 stated that my WSM pistons will be good enough for going a little higher, so the plan will be to shave the head to sst60 specs.
    I measured my pocket depth, which is approximately 15,85mm or 0,64in. Does that sound about right?
    Now the question is how much to take off? I couldn't find the spec unfortunately.

    Also another thought, would it be worth considering tho thermal coat the pistons tops? Not sure how much the cost would be, but I'm wondering if this application would benefit?

    Thank you for your help!

  12. #26
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    Just a little bump for the thread
    Can anybody help me with the cylinder head spec?
    Merry Christmans and a soon a happy new year,
    Leo

  13. #27
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    Look up sst 60 spec sheet

  14. #28
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    Got it! So if my measurements are correct i have to shave of about .2 inches.
    I will malso measure the thermostat area to make sure I ont get thinner than 3mm there.
    At least thats what I read at HPBC. Can someone confirm?
    Thank you!

  15. #29
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    You do realize that once you boost your compression to SST 60 specs. that you will need to run it on 100 octane, right? I would keep the compression down to 150 to 160.
    All that motor needs is to clean up the ports a bit and shave the head 0.060 off. If you were bolting this to a small light race boat than go all out, but in your case I would leave it like what I mentioned first.

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