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  1. #91
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    The differences between the 60 and 75 were very likely present in the 'Scott 60' that set the NOA unlimited record at nearly 52mph ca. 1959
    Definitely not in 1959.

  2. Talking

    Quote Originally Posted by Mark75H View Post
    Definitely not in 1959.
    Only out of curiosity: how can you know that? NOA was McCulloch's showplace, and J.C. Leatherwood was his McCulloch's main dealer/race effort in Tennessee. I would be surprised if the factory did not modify the Scott 60 powerhead used in the time trials. A stock Scott 60 wouldn't run anywhere near that fast on any boat.

    I was there, we raced NOA OPC 1958-60. At the 1958 NOA nationals in Nashville clamp brackets (or swivel brackets) broke
    on seven Scotts. McCulloch flew in replacements to Leatherwood's team. I could generally outrun all Scott 60s on light boats (123' Norris Craft) Norris Lake with my Mark 58A, I'd be the last to claim that the 40s and 60s that set NOA records were stock. Am pretty sure they weren't, there was never a motor inspection in OPC 1958-60.
    Last edited by smokin'joe; 02-13-2011 at 09:15 PM.

  3. Talking

    Love that gearcase. Looks like a plumber's dream.


    Quote Originally Posted by Mark75H View Post
    Without going thru Peter Hunn's Old Outboard Book, the first 3 cylinder that comes to mind was built by Thor ... the predecessor to Merc

    1938 & 39


  4. #94
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    Quote Originally Posted by smokin'joe View Post
    Only out of curiosity: how can you know that? NOA was McCulloch's showplace, and J.C. Leatherwood was his McCulloch's main dealer/race effort in Tennessee. I would be surprised if the factory did not modify the Scott 60 powerhead used in the time trials. A stock Scott 60 wouldn't run anywhere near that fast on any boat.
    McCulloch used WOA as their "showplace" I don't think you can find a single ad mentioning a win at an NOA race ... but the WOA races are prominently mentioned.


    How do I know about the 60/75 stuff? Because I have a technical paper from McCulloch Research asking Champion Spark Plug to help them develop the cylinder head for the 75. The 75 parts just did not exist that early.

    You know as well as I do that all time trial record setters are disassembled and checked to be at previously supplied and approved (by the sanctioning body, not the manufacturer) factory spec. If the porting or compression vary from a regular motor ... the record does not go in the books.

  5. Sam,

    The motors, especially the unlimited class motors, were never torn down in NOA OPC after records. I'm going to post and send you a McCulloch ad listing their NOA records. At the 1958 NOA Nationals in Nashville they flew in parts, clamp brackets on 6-7 40s and 60s broke during the closed course race. The marathon nationals were next day.

    Best wishes,
    Joe

  6. Talking

    Sam,

    Here's where you can see the Scott ad listing NOA records: pg. 131 of Hunn's "The Golden Age of the Racing Outboard". For those of us on the east coast, to a first approximation WOA did not exist. Recall also that McCulloch sent the twin powerhead hydro to Knoxville to try to break the NOA Class X Record.

    Joe




    Quote Originally Posted by Mark75H View Post
    McCulloch used WOA as their "showplace" I don't think you can find a single ad mentioning a win at an NOA race ... but the WOA races are prominently mentioned.


    How do I know about the 60/75 stuff? Because I have a technical paper from McCulloch Research asking Champion Spark Plug to help them develop the cylinder head for the 75. The 75 parts just did not exist that early.

    You know as well as I do that all time trial record setters are disassembled and checked to be at previously supplied and approved (by the sanctioning body, not the manufacturer) factory spec. If the porting or compression vary from a regular motor ... the record does not go in the books.

  7. #97
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    Here's the ad again. Other than Hunn's book, do you know where it was used?
    Attached Images Attached Images

  8. Talking

    Quote Originally Posted by Mark75H View Post
    Here's the ad again. Other than Hunn's book, do you know where it was used?
    Not offhand. I have the 1958-1960 NOA rule books in Houston, might have appeared therein. I think I saw it as teenager and (as my German wife would say) 'groused' and tried to forget it. NOA ruled my Dad's Aristo-Craft illegal for 60-70 class (he could have upped that record 4 mph to 48.5 mph), and he wasn't prepared to run 52 mph in unlimited. We ran strictly stock motors.

  9. #99
    I started taking one motor apart the other day, have you seen this done to the intake runners before?
    Attached Images Attached Images

  10. #100
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    Yes, its called stuffing. Its done to increase velocity

  11. #101
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    Quote Originally Posted by Mark75H View Post
    Dieter Konig, son of Rudolph Konig ... added a cylinder to his 2 cylinder racer to make a 3 cylinder 30 ci racer


    The bottom carb is missing its float bowl.
    You may have noticed that my HRE did not have the original ignition or cylinder head.

    Well, I found an original HRE cylinder head. I've been wondering the whole time I've known about this motor whether it actually ran with the battery ignition or whether it was a work in progress that was never completed. Now I'm pretty sure it was run with the battery ignition ... when I removed the bottom head - the piston ring was imbedded in the head. The piston did not seem to be damaged, nor was the bore.

  12. #102
    Greetings Guys. Maybe Mark75H or one of you can identify this motor .........It is in an early 60's mid-engine racecar I have. ????
    Dave Perry OldSchool Restorations of North Alabama
    Attached Images Attached Images

  13. Old School Restorations

    Quote Originally Posted by OldSchoolRestorations View Post
    Greetings Guys. Maybe Mark75H or one of you can identify this motor .........It is in an early 60's mid-engine racecar I have. ????
    Dave Perry OldSchool Restorations of North Alabama
    1975-ca. 1987 OMC 75, used in EP/SE classes, 49.9 c.i., or else is
    the slightly different 70 hp block. Ignition system is not OMC,
    powerpack and coils are missing. Has had other carburetors adapted.
    Missing the exhaust tuner (that means lost hp). Easy to get parts for the
    75.
    Attached Images Attached Images
    Last edited by smokin'joe; 02-13-2011 at 07:26 PM.

  14. Quote Originally Posted by MattGreen View Post
    Sam, in the late 90's - early 00's OMC/BOMB made a small 3 cylinder - 25 & 35hp. I think they were made for about 5 or 6 years, in parallel with the traditional 2-lungers. The 3 cyl were legal in Sport C and at least a few Region 10 racers did use them.

    Matt
    The 3 cyl. OMC 25/35 was designed by Jim Nerstrom, and was produced mainly for the Italian market. Jim says the 35 is more like a 40-45 hp motor. They're rare in the U.S. and are not easy to find in Europe.

  15. Quote Originally Posted by Mark75H View Post
    Volvo/Crescent/Archemedes triples

    Just one of many V/C/A triples made in the late 60's & early 70's





    The "Tornado" version of the 55 with the smaller non thru hub lower unit

    Note the 1955-2000 OMC 25/30/35/40 clamp and swivel bracket system. McCulloch Scotts used the same system. 5/6
    shock mounts on a Scott 25, e.g., can be replaced by OMC 25/35 mounts.

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