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  1. Thread: Nosecone

    by Per
    Replies
    131
    Views
    37,685

    I am just a reader of this interesting thread. I...

    I am just a reader of this interesting thread. I felt that if you don't belive the numbers posted why not just say so. I'm sure that is possible without telling people they are talking bs. Or even...
  2. Thread: Nosecone

    by Per
    Replies
    131
    Views
    37,685

    That was rude and unnecessary. The speed is very...

    That was rude and unnecessary. The speed is very good, but not unobtainable.
  3. Replies
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    2,675

    Used to work with turbines, miss it from time to...

    Used to work with turbines, miss it from time to time...
    Beutiful blade, and that is only on the outside, sometimes they have qiute complicated sandwich structure inside aswell.
  4. Thread: Johnson "70mod"

    by Per
    Replies
    370
    Views
    106,688

    Phill, Don't know why the OMC engine looks the...

    Phill, Don't know why the OMC engine looks the way it does but one thing is for sure, when Aprilia speaks about low to midrange they probably mean what we consider top RPM for our OMC 56" engines.
  5. Replies
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    3,159

    I ASSUME that the notch is there as a idle...

    I ASSUME that the notch is there as a idle reliefe.
  6. Thread: Idle relief holes

    by Per
    Replies
    12
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    4,180

    No I can't, didn't say that it was tried and...

    No I can't, didn't say that it was tried and tested, should have been more clear with that, sorry!
    But since epoxi (marine tex) seems to work for a lot of people I thought that next time I overhaul...
  7. Thread: Idle relief holes

    by Per
    Replies
    12
    Views
    4,180

    Do a google search for "plugging idle reliefe...

    Do a google search for "plugging idle reliefe holes"
    There are numerous ways for solving this task, thread the hole and glue in a screw, use epoxi....
    I have not done this myself but I will try...
  8. Replies
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    13,964

    I suggest you use ABS. PLA pretty much s*cks to...

    I suggest you use ABS. PLA pretty much s*cks to machine or shape. Been there done that, had to get new part made of ABS. Have no experience from printed nylon parts. don´t expect to use a printed...
  9. Thread: OMC Orifice Plugs

    by Per
    Replies
    15
    Views
    4,878

    Had an air jet coming loose in my OMC 56ci -92, I...

    Had an air jet coming loose in my OMC 56ci -92, I didn't notice any change in top end but the idle suffered and the boat struggled to get on plane at all. For me those jets made a huge difference.
  10. Replies
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    2,411

    Thanks for the help Mike! Spent a couple of...

    Thanks for the help Mike!
    Spent a couple of hours on the Internet last night and found out that 70673D is the model code for a 70hp from -76. Guess my gut feeling was right. If only I had seen...
  11. Replies
    4
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    2,411

    True 75hp? OMC 49ci -81

    just started to take a closer look at the Engine I brought home last week, the label at the bracket says E75ERCIM wich makes it an 75hp from -81.

    Is there a way to make sure it is a 75hp? other...
  12. Replies
    75
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    23,107

    Think I Will be able to sort the rust on the...

    Think I Will be able to sort the rust on the taper with electrolytic rust removal and a buff. Just want to make sure I could use it before I put any work into it. Thanks for the heads up!
  13. Replies
    75
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    23,107

    OK, I know you are spinning your Engines hard but...

    OK, I know you are spinning your Engines hard but would you considder a cast crank for some thing not meant to spin higher than 6500 or so RPM? 4-spline 56ci cranks are not easy to find here either:(...
  14. Replies
    75
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    23,107

    Speaking about cranks

    I found a crank from an old 55hp Electric shift engine some time ago. I noticed that it has a portion next to the flywheel taper is machined to three cams will this work in my 56ci block together...
  15. Replies
    17
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    7,463

    Indeed, VERY nice work! I have been listening to...

    Indeed, VERY nice work!
    I have been listening to what all you guys said and got my self a Evinrude 75hp short shaft, Money and motor has not changed hands yet but the seller seems very dependable...
  16. Replies
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    7,463

    OK, so maybe I have been heading in the wrong...

    OK, so maybe I have been heading in the wrong direction here...
    So the alternative for me would be to try to find a Nitro case and then just solve the Trim parts (which I already have the pump for)...
  17. Replies
    17
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    7,463

    Oh, sorry Oledawg, forgot to answer your...

    Oh, sorry Oledawg, forgot to answer your question, good thing you brought it up Hevi Kevi!
    Maybe I can blame it on the flue and fever...

    The main goal with the project is:
    A short shaft engine,...
  18. Replies
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    7,463

    Thanks for the wise words everybody! Seems I...

    Thanks for the wise words everybody!
    Seems I could go either way then, Think I'll let the price decide. I know at least one place to ask about cutting splines. I'll check with my personal outboard...
  19. Replies
    17
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    7,463

    Options for shaft adaptor?

    I'm working on a project that involves a 56ci OMC, a 15" mid and a V4 gear case. the engine will most likely be something like 16" because I need an adapter plate between the mid and gear case. The...
  20. Replies
    11
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    4,881

    I have done one on my omc 56, the one i did had...

    I have done one on my omc 56, the one i did had no lwp through (running water pickup on the transom). there is no rocket science involved just a lot of fairing and grinding and fairing and...
  21. Thread: Crescent 500 specs

    by Per
    Replies
    38
    Views
    15,918

    More video...

    http://www.youtube.com/watch?v=MrhUXLz6dX8
  22. Thread: Crescent 500 specs

    by Per
    Replies
    38
    Views
    15,918

    There is actually several:) ...

    There is actually several:)


    http://www.youtube.com/watch?v=A5hgTKdqATM


    Very nice engines, but I'm quite biased as I own at least three Volvo Penta / Archimedes Penta VP700 and they were...
  23. Thread: Crescent 500 specs

    by Per
    Replies
    38
    Views
    15,918

    From an article in "Nymans Vänner" Gösta...

    From an article in "Nymans Vänner"

    Gösta Stillerud, Thure Åkerfldt and Carl-Erik Zander was in the original group that developed the engine, they worked for Nymans Verkstäder (the company that...
  24. Thread: Crescent 500 specs

    by Per
    Replies
    38
    Views
    15,918

    Nope, AFAIK there are no relationship between the...

    Nope, AFAIK there are no relationship between the SAAB and Crescent engine. I will speak to a couple of knowledgeable people and see what I come up with...
  25. Nice work! Does it work well?

    Nice work!
    Does it work well?
  26. This is the drain hole. 55895 I have a water...

    This is the drain hole.
    55895

    I have a water pickup mounted at the transom.
  27. 55892 I'm sure there are many ways to solve this...

    55892
    I'm sure there are many ways to solve this but this is how I did mine.

    I run separate water pickup but the drilling and filling part would be the same.
    The gear case in the picture will...
  28. Replies
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    13,063

    Spent the last weekend at my brother's place, the...

    Spent the last weekend at my brother's place, the plan was to resurrect the engine that got damaged in the Roslagsloppet last year. We didn't really finish the project, some wine and talking a lot of...
  29. Replies
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    3,814

    The boat does not have any bad porpoising...

    The boat does not have any bad porpoising behavior and the gearcase doesn't seem to move around alot in the video i posted in my last post but I will check it out for sure! I got a feeling that the...
  30. Replies
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    3,814

    Thanks for your interest in this matter! Yes...

    Thanks for your interest in this matter!

    Yes Google translate is a very good thing isn't it!

    zul8tr don't pay to much attention to how the boat rides in the video, I think the speed is only...
  31. Replies
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    3,814

    What to do with the cat?

    Hi all!

    I need help to decide what to do with the running surface on my tunnel hull.
    In Sweden we have a racing class called "Classic offshore". The boat model must be at least 25 years old,...
  32. Replies
    0
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    704

    Change the running surface on my cat?

    Hi all!

    I need help to decide what to do with the running surface on my tunnel hull.
    In Sweden we have a racing class called "Classic offshore". The boat model must be at least 25 years old, you...
  33. Replies
    20
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    13,063

    Maybe the changed pump on engines going to such a...

    Maybe the changed pump on engines going to such a warm place? the engine has no thermostat so there must be another way of dealing with different water temperatures

    OMC part number 377230 (maybe...
  34. Replies
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    13,063

    pdt: Not that it matters to you anymore but one...

    pdt: Not that it matters to you anymore but one can actually use a OMC impeller and just enlarge the hole slightly, I have the number in my work shop manual if anyone is interested...

    I guess all...
  35. Replies
    20
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    video

    Nice ride pdt!
    I had heard about those quwait engines before but thought that it was only a rumor...

    I just realized that there is actually one video of the boat from herräng already on YouTube,...
  36. Replies
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    13,063

    Nice to hear from more people working on these...

    Nice to hear from more people working on these engines!

    It worked very well until the Power head came loose during the first half of Roslagsloppet last year. I noticed it to late and two cylinders...
  37. Replies
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    4,613

    shenders: I will have to make you disapointed,...

    shenders:
    I will have to make you disapointed, we have 8" of snow and roughly the same amount of ice on the lake:D
    In about two month the snow and ice is hopefully gone and testing season begins....
  38. Replies
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    4,613

    Thanks everybody!! Mike Schmidt: I would...

    Thanks everybody!!

    Mike Schmidt:
    I would really love to put a set of Mikuni carbs on that engine! I have already found what I think would be a good candidate for the swap, carbs from Yamaha RD...
  39. Replies
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    4,613

    shenders: My German is not the best but I think...

    shenders:
    My German is not the best but I think that the view on page two in the Bing pdf is describing three different ways to connect the pressure pulses from the crank case.
    In the Volvo Penta...
  40. Replies
    17
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    4,613

    Now I understand what is causing the confusion!...

    Now I understand what is causing the confusion!
    My second picture showing the pump is from when I bought the engine and in that pic it is missing the top carb, therefore one of the hoses appear to...
  41. Replies
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    4,613

    Thanks! That picture gave me some ideas:) ...

    Thanks!

    That picture gave me some ideas:)

    Belive it or not but the lenght and diameter of the different lines is according to the work shop manual, it states that the routing of the longest one...
  42. Replies
    17
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    4,613

    Thanks for sharing your ideas guys! 3030: Is...

    Thanks for sharing your ideas guys!

    3030:
    Is there any chance that you have a picture or sketch showing how the baffels were arranged? To me fuel getting pushed away from the jet seems like a...
  43. Replies
    17
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    4,613

    Cornering hard, fuel starvation?

    last summer finally got my 15' TigerCat back on the water after a long restoration.
    I riggged it with one of my somewhat modified Volvo Penta VP700 engines.
    The powerhead came loose during the...
  44. Replies
    91
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    40,530

    "Half out= more speed" is true under the right...

    "Half out= more speed" is true under the right circumstances. With a prop designed for it you cut your losses and thereby win speed:)
  45. Replies
    91
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    40,530

    There are several interesting movies on youtube...

    There are several interesting movies on youtube showing surfaced gercases, you will be surprised how high the water "climbs" or get pushed up. Normally you see a lot of spray comming from beneth the...
  46. Replies
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    7,430

    Matter of model year?

    My -91 56CI bridgeport has them so perhaps it is a question of when they are built...
    I'm about to tear down a -92, wonder what's inside that one:)
  47. Joe posted while I was typing, maybe you should...

    Joe posted while I was typing, maybe you should get a pic of it...
    The facts in my previous post is still valid though:)
  48. If it is for a Archimedes Penta 600 Or rather a...

    If it is for a Archimedes Penta 600 Or rather a Volvo Penta 600 with thru hub ex it will be a 13 spline.
  49. Phill If a prop is cheap, buy it! If it don't...

    Phill
    If a prop is cheap, buy it! If it don't work well sell it! You might loose the shipping cost and then some but chances are you will learn a lot from testing a lot of props. high speed will...
  50. Thread: 'Face cup'

    by Per
    Replies
    15
    Views
    5,607

    Is his surname perhaps Bäckmo? :) I have...

    Is his surname perhaps Bäckmo? :)
    I have followed your discussion on "angle of attack" on a different forum...
    I'm sure not many can produce a good race prop regardless of what tools and knowledge...
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