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  1. #10126
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    PS, I heard someone that knows how to measure an engine turned up.....
    Old proverb, he that grinds on a stock engines knows what they are doing

  2. #10127
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    Well..you are allowed the grind on the engine block as long as the measurements is matching the homologation.

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  4. #10128
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    Quote Originally Posted by lars strom View Post
    Well..you are allowed the grind on the engine block as long as the measurements is matching the homologation.
    exactly

  5. #10129
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    Evinrude - Johnson outboards. Facts, history, racing and OMC.

    Jack Aylsworth ·

    1968 – THE BEGINNING OF OMC’s LEGENDARY LOOPERS

    Billed as America’s first looped charged, multi-cylinder outboards - and the most potent motors in the mid-horsepower range - OMC’s revolutionary loopers produced more power per-cubic-inch with less fuel consumption. Over a 33-year period, the 2 & 3-cylinder loopers became two of OMC’s longest running and most profitable models.
    The 55hp 3-cylinder was launched in 1968. In 1971, a 2-cylinder, 50hp looper joined the 3-cylinder looper which had increased to 60hp in 1970. Continuing power increases for the 3-cylinder model followed with 65hp in 1972, then 70 hp in 1974. Also in 1974, both brands targeted performance boating with specially styled and named loopers – the 70hp Evinrude Hustler and Johnson Stinger. The Stinger is best remembered for its striking orange paint job. Evinrude extended their performance approach with a 2-cylinder 50hp Sizzler. Looped horsepower jumped again in 1976 when Evinrude introduced the 75-S and 55-S Sport models and Johnson debuted the 75hp Stinger and a 55hp 2-cylinder. While the 3-cylinder motors peaked at 75hp, the 2-cylinder line-up would expand to 50, 55 & 60 horsepower models by 1980. (See the ads for additional tech info.)
    THE “RED HOT” STINGER– Launched as a “1972 Limited Edition” model - just in case screaming orange was too daring - the 65hp Stinger was an instant hit. The 1972 / 1973 model, shared identical mechanicals with the standard 49.7 cu. in. Johnson 65 looper producing its BIA certified horsepower at 5000 rpm.
    Playing off that initial success, an upgraded 70hp Stinger followed in 1974 with a massive ‘70’ on its flanks. Its additional 5 horses were credited to refined tuning and improved carburetion. Doubling down on performance, horsepower increased again in 1975, now to 75. Again, festooned with a bold horsepower ID on its sides announcing its presence. Those extra 5 horses came from new exhaust ports, a redesigned combustion chamber and a new, low restriction air-intake silencer with a BIA certified 75hp rating at 5500 rpm. A high-compression cylinder head was optional.
    RACING LOOPERS – The Evinrude CC & Johnson SR were 49.7-cubic inch, triple cylinder race engines based on the 75-hp Johnson Stinger & Evinrude Hustler block. These racing loopers are likely best remembered as pure factory-available, race-ready outboards. Both the 2 & 3-cylinder loopers competed in various stock production classes and race-tuned classes over the years, winning consistently. In addition, stock production motors with 15-inch lower units and high-speed Nitro gear cases also took top honors.
    MILITARY LOOPER - The 2002 US Navy Seal Enforcer 2-cylinder, 55hp submersible outboard. Designed specifically for beach landings and to be submersible with a de-watering system that could drain water from the engine, should it be intentionally or accidentally submerged. The outboard lower unit was an enclosed pump-jet system preferred by Special Forces to avoid inadvertent injury to divers in the water.
    COMMERCIAL LOOPERS – Starting with the 2-cylinder, 50hp, rope start, tiller model in 1979, these motors became highly regarded as tough and reliable working outboards around the globe, usually in remote rural locations. Over the years, 55hp, 60hp & 65hp models were added. Commercial loopers were detuned versions of the standard motors to utilize low octane, poor quality, fuel often found in 3rd world countries. They had extensive anti-corrosion coating in critical areas and more stainless steel fasteners than the regular production engines. The water pumps used a chrome-plated aluminum pump housing for longer life in muddy or sandy waters.
    Notably, Johnson commercial outboards were dominant in several countries including South and Central America. In many places there, an outboard was referred to as a “Johnson” – no matter the actual brand. In fact, someone who ran an outboard was known as a “Johnson operator.”

    Attached Thumbnails Attached Thumbnails omc 3cyl.jpg  

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  7. #10130
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    Quote Originally Posted by lars strom View Post
    TMK-Racing As is in Vila Velha de Ródăo.


    Yesterday we won our first UIM F2 World Championship race. As the first Norwegian team in many many years and with some of the world’s greatest powerboat racers behind us


    At the post-inspection, the scrutineers from UIM checked our engine and decided to disqualify us. The same happened to 2nd and 3rd driver of the race.

    Despite 100% legal measures, the scrutineers found our engine to be out of the rules based on personal subjective means.

    We are heartbroken, shocked and devastated to be in this situation. The best day of my power boatlife suddenly turned out to be the worst.

    Within some days we will decide our next step in this case.








    Stefan Hagin

    Official announcement from Stefan Hagin and Team ROWE / RPM powerboat:

    After taking second place in UIM F2 World Championship Vila Velha de Rodao GP, and winning overall UIM Formula 2 World Championship 2022, and 5 hours of engine inspection, we have been DSQ from last race due to technical issue.

    Highly considering reputation issues and showing professionalism in whole season, Team ROWE / RPM powerboat is sure that was racing fair, its engine was compleately legal, had no any illegal modifications and with great respect to other competitors.

    Due to this fact was submitted the protest that was denied by jury commission at night after inspections.
    The Jury decision will be appealed to UIM according to the UIM Rulebook. Meanwhile it will be requested to provide independed technical inspection in presence of professional engineer having successful experience with Mercury engines.

    Accordingly Stefan’s engine has been packed, locked with signatures of team manager and UIM commissioner to be sent and re-measured in proper conditions.

    Stefan Hagin and Team ROWE / RPM powerboat with great reapect to competitors and sports supports fair race and fair play.

    Here in lies the problem. If it takes a professional engineer to INTERPRET the written engine technical rule book (UIM or APBA), then the rule book isn't getting the job done! Dimensions solve are certain set of issues but "OEM" is a breeding ground for a whole other world of disputes. In this day and age of computers and digital photos, there is NO excuse for further improvement of documented engine technical specifications. The burden should not be placed on inspectors forced to state THEIR INTERPRETATION of the technical specifications. If they are, then the rule book (UIM or APBA) isn't good enough!
    Last edited by WaterZebra; 09-21-2022 at 09:49 AM.

  8. #10131
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    Renato Molinari Saffa OZ 1979.

    Click image for larger version. 

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  10. #10132
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    Cees van der Velden. Same OMC power as Renato above.
    OZ 1979

    Click image for larger version. 

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  11. #10133
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    Quote Originally Posted by WaterZebra View Post
    Here in lies the problem. If it takes a professional engineer to INTERPRET the written engine technical rule book (UIM or APBA), then the rule book isn't getting the job done! Dimensions solve are certain set of issues but "OEM" is a breeding ground for a whole other world of disputes. In this day and age of computers and digital photos, there is NO excuse for further improvement of documented engine technical specifications. The burden should not be placed on inspectors forced to state THEIR INTERPRETATION of the technical specifications. If they are, then the rule book (UIM or APBA) isn't good enough!
    Its how to measure and with what tools as the main issue.
    The dimension are in back and white.
    Measuring radii down in a bore is not so easy.
    IMHO the sanctioning body should sell the tools.
    Last edited by powerabout; 09-23-2022 at 05:47 AM.

  12. #10134
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    Hull design ?

    Quote Originally Posted by lars strom View Post
    Cees van der Velden. Same OMC power as Renato above.
    OZ 1979

    Click image for larger version. 

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    I see some basic difference in the pictures of the two boats the one that Molinary is driving in the one that Velden Is driving. Lars Were you there at the time and can you give us some insight into the differences between the two hills At the time. Thank you

  13. #10135
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    Quote Originally Posted by Amberjack1234 View Post
    I see some basic difference in the pictures of the two boats the one that Molinary is driving in the one that Velden Is driving. Lars Were you there at the time and can you give us some insight into the differences between the two hills At the time. Thank you
    Yes I was there at the time 1979 and drove a sister boat to Renatos Saffa #2 above in Paris 6 hours 1978 for Team Molinari.
    In my opinion the Molinari boats woodwork was much nicer then Velden's..(Velden did win the Paris 6 hours 1979 so nicer woodwork don't help sometimes..)

    This is me below driving the #11 Saffa/Molinari in Paris 1978.

    Attached Thumbnails Attached Thumbnails Paris-1978-3.jpg  

  14. #10136
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    Good pictures

    Good pictures
    Quote Originally Posted by lars strom View Post
    Yes I was there at the time 1979 and drove a sister boat to Renatos Saffa #2 above in Paris 6 hours 1978 for Team Molinari.
    In my opinion the Molinari boats woodwork was much nicer then Velden's..(Velden did win the Paris 6 hours 1979 so nicer woodwork don't help sometimes..)

    This is me below driving the #11 Saffa/Molinari in Paris 1978.

    Thank you Lars for the pictures. As you say prettiest sometimes not faster. Would you say the building was a better rough water boat Then the Molinari hull Or did the brakes just fall to Cees in that race

  15. #10137
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    Quote Originally Posted by lars strom View Post
    Yes I was there at the time 1979 and drove a sister boat to Renatos Saffa #2 above in Paris 6 hours 1978 for Team Molinari.
    In my opinion the Molinari boats woodwork was much nicer then Velden's..(Velden did win the Paris 6 hours 1979 so nicer woodwork don't help sometimes..)

    This is Renato's race shop on Lake Como, Italy. Where arguably the finest wooden tunnel boats were built in the early 1970's.

    These photos were taken in 1973 with me operating the boat lift. Bottom right photo shows the side entry to the boat hoist. The wooden boat construction was done on the 2nd floor, where the dual rows of long vertical windows are. Above that is the 3rd floor - roof top offices.

    I remember preparing before the Paris 6 Hour 1973 race, when Cees vander Velden told me, that Renato Molinari forbidden Cees from going into the 2nd floor. Renato must have sensed that Cees would one day build his own tunnel race boats.



    Click image for larger version. 

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  17. #10138
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    Quote Originally Posted by Amberjack1234 View Post
    Good pictures Thank you Lars for the pictures. As you say prettiest sometimes not faster. Would you say the building was a better rough water boat Then the Molinari hull Or did the brakes just fall to Cees in that race
    Paris 1979 was a brutal one..here is some of the story..https://svera.se/blogg/paris-6-hours...a-3-liter-v-6/

    Paris Six Hours 1979… OMC's overall win. Beats the Merc T-4 with a 3 liter V-6

    More OMC victories over the Merc T4.


    This was the largest factory battle of the year.
    Three boats rigged with the big bore V6 -T4 from Team Mercury.
    OMC used their 3 liter V6 looper fuel injection and the result couldn't get any better.
    Cees van der Velden/Tom Posey won in the #4 Velden/Johnson RS 3 liter.. leading 181 laps of the 185 he won with.
    Second was Renato Molinari/Barry Woods in the #3 Molinari/Evinrude CCC 3 liter 184 laps.
    No Merc T4 finished the race.
    How do I know this:
    I was there racing the OE/F3 class and finished third with our Sjoberg/Evinrude CC



    Attached Thumbnails Attached Thumbnails Paris 79 Winner.jpg  

  18. #10139
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    Thanks for info

    Thanks for info
    Quote Originally Posted by lars strom View Post
    Paris 1979 was a brutal one..here is some of the story..https://svera.se/blogg/paris-6-hours...a-3-liter-v-6/

    Paris Six Hours 1979… OMC's overall win. Beats the Merc T-4 with a 3 liter V-6

    More OMC victories over the Merc T4.


    This was the largest factory battle of the year.
    Three boats rigged with the big bore V6 -T4 from Team Mercury.
    OMC used their 3 liter V6 looper fuel injection and the result couldn't get any better.
    Cees van der Velden/Tom Posey won in the #4 Velden/Johnson RS 3 liter.. leading 181 laps of the 185 he won with.
    Second was Renato Molinari/Barry Woods in the #3 Molinari/Evinrude CCC 3 liter 184 laps.
    No Merc T4 finished the race.
    How do I know this:
    I was there racing the OE/F3 class and finished third with our Sjoberg/Evinrude CC



    So that would’ve been the three cylinder 75 stinger For the equivalent Of what We were racing there in the United States at the time.

  19. #10140
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    Quote Originally Posted by Amberjack1234 View Post
    Thanks for infoSo that would’ve been the three cylinder 75 stinger For the equivalent Of what We were racing there in the United States at the time.
    Well..OMC made a special race engine for the UIM OE/F3 class..and the APBA Mod 50 class.
    Much more powerful than a regular OMC 3 cyl..special mid section with racing gear case.
    The Johnson was named Stinger RS and the Evinrude CC.
    Both pictures are me racing the Stinger RS (first) and the CC




    Attached Thumbnails Attached Thumbnails Stinger RS.jpg   cc.jpg  

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