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  1. Replies
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    4 into 1 makin 200hp...

    4 into 1 makin 200hp http://www.youtube.com/watch?v=Ceeyrmn2Pj4
  2. Replies
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    these numbers make sense, exh opens at about 87...

    these numbers make sense, exh opens at about 87 deg atdc and trans at about 114 deg atdc (like omc 49)
    thx Sam
  3. Pipes are Colder on water or Vacuum is assisting scaveging or a combination of both

    spray some water vapor also???
    Pipes are Colder on water [(apart from water injection) watercraft tune jacketed exhaust by manipulating water temp surrounding pipe]
    one way to correlate engine...
  4. Replies
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    cresent port specs

    anyone know actual Port Specs ????
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    45ss does it getting on plane. will try balancing...

    45ss does it getting on plane. will try balancing tubes soon.
  6. once again for planing hulls that run high speed...

    once again for planing hulls that run high speed = k * sqrt of hp
    more than one boat builder has used it to predict speed of a boat for a change in hp

    let me go one step further with my real life...
  7. Replies
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    1978 apba inspection sheet

    Found a link to view 1978 APBA INSPECTION SHEET but did not work..........................:mad:
  8. Replies
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    Crescent 500 specs

    Where can I get Crescent 500 cs specs?????
  9. sqrt did not mention cubed

    sqrt did not mention cubed
  10. 14' gw Invader 90 hp = 72 100 = 78. The boat is...

    14' gw Invader 90 hp = 72 100 = 78. The boat is dragging less in water.
    So V(hp) = k*(hp)^.5 works on planing hulls (racing) over small intervals.
    air resistance increases proportionally to...
  11. Replies
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    In general larger the dia or area higher...

    In general larger the dia or area higher effective rpms. several
    snowmobile triples have them to help low rpms out.
  12. as Speed insreases resistance in creases exponentially

    as speed increases Resisteance "Drag" from air increases exponentially so does resistance to lower unit.
    Speed as a function of Horse Power thru air alone can be expressed by

    V(hp)air = K *...
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    no , needs to be tuned up

    no , needs to be tuned up
  14. Replies
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    help balance intake pulses at low rpms so it...

    help balance intake pulses at low rpms so it trolls around and gets on plane
  15. Replies
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    the 21p @ 5500 was 40 mph on the carolina skiff...

    the 21p @ 5500 was 40 mph on the carolina skiff 11% slip , rig weighd about 900 lbs.
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    Brand New OMC BRP 391014 in box. Aluminum prop...

    Brand New OMC BRP 391014 in box. Aluminum prop 11.25" x 21 P

    Fits: JOHNSON EVINRUDE - TWO CYLINDER, SMALL GEARCASE;

    40HP (1984 THRU), 48HP (1987 THRU), 50HP (1975 THRU),
  17. Replies
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    http://www.boatracingfacts.com/forums/showthread.p...

    http://www.boatracingfacts.com/forums/showthread.php?7565-Clydes-Ride

    different project with a 1985 40 converted
  18. Replies
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    11.25 x 21p omc

    aluminum 11.25 x 21p omc on 1996 stock johnson 20" 50hp , the 11.75 x 19 ran about 40mph
  19. Replies
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    had a stock 96 50 johnson on a 16' Carolina...

    had a stock 96 50 johnson on a 16' Carolina Skiff Ran 43mph cosistently with a 21p omc alum prop.
  20. Replies
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    work on most outboards

    the stacks in pic are worth 2 jet size increase on modfied 45ss along with rest of intake system mods.

    tuned length of reed valve two stroke is measured from tip of reeds to end of velocity stack....
  21. Replies
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    Russ dodge , pole cat 1 litre mod

    RUSS Ran Inland Jets kawasaki 1100/900 pipe and set a kilo Record with it. I purchased a Inlandjet system yrs ago to measure the system.
    It added made +20 hp over OE Exhaust System and really...
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    I vote for the block you can not use in OPC SST-60

    Do you know what Time Area and blow down are? Area by itself is a small slice of the pie.

    I vote for the block you can not use in OPC SST-60

    http://www.wptracing.com/sst-60

    "Modified Package...
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    30 lbs over weight cant air out

    30 lbs over weight cant air out
  24. Replies
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    depends on prop, copy something that works and...

    depends on prop, copy something that works and improvr if possible.
  25. DAH Props has a wall of nothin but the Originals....

    DAH Props has a wall of nothin but the Originals. I would look for a original sst-60 or Super E wheel.......................
  26. Replies
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    send it out unless you have back-up

    Send it to WIENDANT he prefers oval port 56 and by far has most experience with the OMC 56gi . http://www.wptracing.com/sst-60

    or Howard Richards (Ran OMC's Second Effort Porting, develepod...
  27. Aluminum 56 Rod Concept

    There are some relatively new Aluminum Alloys and Processes out there one vendor has succesfully made rods that are used in small block V-8's on the street with reliability . the down side is they...
  28. Potential

    Spoke to Second Effort Tech who develeped Mod 50 Porting for the Engines sent to Europe back in the 70's.
    From our many discussions he said the short coming of the engines were the cast steel...
  29. 220 gram 56/49 custom rod

    220 grams , found centermain sleeves to use for custom 56, 49 or 45 rod
  30. Replies
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    2000 omc 50

    The 2000 50 Cylinder head can be milled to 45spec 0.515" deep, stock is approx 0.560" worth about 5 hp and will run on 93 octane pump gas.
    You can go up on timining , the 60hp twins ran 21 deg from...
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    56 f3 bottom end simulation

    Still workin in Autodesk Inventor Suite, lookin at next project.
  32. Outboard engine crankshaft center main split outer race search

    working on the project and need a Bearing with Split Outer Race.
    Looking for 1.625" - 1.5" O.D. Split Race.

    PART # & Dims of AVAILABLE SPLIT OUTER RACE bearing you know of would help.
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    how much is it worth to you

    have a mint nitro foot with 15:28 gears, let me know if your interested.
  34. Replies
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    45SS PIPE for stock porting

    New Dell XPS 17 Laptop Loaded w/Autodesk Invetor Suite 3D/2D
    Working on Design for "Stock" 45 Pipe based on aftermarket RD Rev II Pipe for Yamaha Superjet.
    First pipe was a early RD 750zxi pipe...
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    gear ratio's for OMC 40-75 hp "small gearcase"

    12:29
    15:28 - about $600 us for pinion, fwd, reverse & sst 60 clutch dog.
  36. Water routing and cooling system

    The old man at the shop and his son showed me some outboard drag tricks the used on their Yamaha v6.

    They wanted to have engine cylinders at operating temp approaching start.
    cylinder heads about...
  37. depends on water routing

    depends on routing of water.
    Was always watching temp
    At discharge hose.
  38. 45ss vs d mod merc

    the pic of the white boat $500, 200lbs old pro did beat 2003 APBA short course nat and AOF nat winner from behind 3 heats at Camden NC oct 2003. There are a couple d mods out there that are faster...
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    Sticky: Measured

    measured the system and can make them for outboards .
    Won't use silicon couplings, v-bands hold up .
  40. Replies
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    Sticky: 3 cyl KILO RECORD

    Well a lot of pontificating been going on but reality will knock sometimes.
    inboard APBA mod kilo record was set using NLA Inland Jet pipe on Kawasaki Triple.
    Not as much power as three pipes but...
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    Modify it

    If your going to rebuild it Port it , their all the same after that.
    remove sleeves and port it and then you got a race motor.
  42. send me two blocks

    send me two blocks , will port behind liners , set up head for your fuel , make bolt on out the mid pipe(with removable beer can silencer) , mod intake system to engine set up . I keep one short...
  43. Replies
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    doesnt matter

    if you are going to re-build , remove sleeves and port, they are all equal after porting.
    Let me know and I can dig up a rec porting template for you.
  44. Replies
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    depends

    Why do all have same number?
  45. pull the cylinder head

    Sounds good so far, how far apart are cylinders ?
    Pull head lets look at it.
  46. step 1

    Are these engines Available?
    How much for a beater to rebuild?
    How many rpms will these turn w/o flying apart?
    What is bore centers distance?
    What is rod/ratio?
    Can you take good pics of block...
  47. Replies
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    congradulations

    3.14*((bore/2)^2))*stroke
    That's what it looks on my Excel spread sheet.
    Bore/2 = Radius.

    Avg Japanese math student places in top 5%
    In USA.

    Keep up the good work and at some point we will...
  48. nothing new under the sun

    Yamaha SUPERJET 701 TWIN
    comes stock with individual tuners similar to the 60 twin, makes 73 hp , with twin 38mm carbs and several other similarities to the 45.
    Difference is in the late nineties...
  49. Talked to OMC Tech that developed 45ss tuner and ...

    Talked to OMC Tech that developed 45ss tuner and learned that they tried over a dozen pipes. Two cylinder will NEVER do what Triple does from a tuner cause there is no cross plugging going on. Two...
  50. two cylinder outboard

    The 45ss 740cc twin easily will make 90hp on pump gas @ 7,000 rpm.
    The cranks are good right from SEAWAY Marine. all we did was check for T.I.R. on mains, Cryo by "Three Hundred Below" and go....
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