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  1. Replies
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    Its a proto type, who knows what the production...

    Its a proto type, who knows what the production engine would have looked like ??????
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    I have one also and would like to pad it....

    I have one also and would like to pad it. Pictures of other padded 150's would be appreciated.
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    Hey phillnjack, any pictures ?

    Hey phillnjack, any pictures ?
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    The model number says it is a 1975.

    The model number says it is a 1975.
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    Studebaker Engines for boat racing

    I believe that the 224 cu/in Studebaker V8 engine (a 289/259 with a very short strok) was used in boat racing also. It had a 3.56 bore and a 2.81 stroke and loved to rev, I heard of them turning over...
  6. Great pictures, and thumbs up to the skier :eek:.

    Great pictures, and thumbs up to the skier :eek:.
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    Ron, go to page 5 of Outboard History and about...

    Ron, go to page 5 of Outboard History and about half way down to title "Sandcast Thunderbolts".
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    My article on the Sandcast Thunderbolts was...

    My article on the Sandcast Thunderbolts was published in the Antique Outboarder Book dated April, 1990 and was reprinted here 7/26/2010 titled The Sandcast Thunderbolts. Take some time guys and read...
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    My answer was for Mark 55's not Mark 55H's.

    My answer was for Mark 55's not Mark 55H's.
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    If you would go back and read my article call the...

    If you would go back and read my article call the "Sandcast Thunderbolts" you will see that a small groupe of Mark 55's where indeed Sandcast.
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    Hey Sam, You remember, the early Mark 55's were...

    Hey Sam, You remember, the early Mark 55's were sand cast also. :D
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    more please

    :) Great pictures Sam !!!!!!!!
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    Thanks

    Thanks for yor comments, my next project hopfuly this summer' will start with a 1978 merc 900. From what I hear not much can be done to an inline six, aaaaaah the challenge.:D
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    Now the other one

    I started with a 1975 OMC 135 block and made the following changes. Reworked the porting as shown, did not change port timing. I then removed the cast water line that takes water from the block to...
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    1970 115 Evinrude

    Built this engine in the summer of '05 and installed it on a 1972? Marlin Sidwinder. As some of you might remember, I worked for OMC back in the late 60's and early 70's. Anyhow a stock 115 (96.2...
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    Show me

    :) Sure would like to see some inside picture of those bad boys. Realy interesed in pictures of the porting and exhaust system.
  17. Thread: How many RPM's?

    by 194265
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    Rpm

    Works for me too. Now to mess we you all a little bit, the constant is realy 5252, but then you all knew that, right :D.
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    Getting something off my chest

    Somethings that have been bugging me lately. When ever we talk about "Mercury Outboards" the subject always gets around to the six cylinders, whether inlines or V's. Now don't get me wrong, they...
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    Merc 650 4 cylinder

    Got a 1966 4 cylinder 650 and was wondering if the the sleeves have enough wall thickness to bore out 2 15/16. The original bore is 2 7/8 and I have a set of the later pistons with the 2 15/16 bore....
  20. Thread: How many RPM's?

    by 194265
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    Back to main topic

    In regards to all production outboards that produce their peak HP between 5000 & 6000 rpm, I will stay with my original propping statement of 10% above the HP peak. Thats my .03 worth.:rolleyes:
  21. Thread: How many RPM's?

    by 194265
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    torque

    No Sam you did not say it changed, you and I were both answering the earlier posting and you beat me to it.:D:D:D
  22. Thread: How many RPM's?

    by 194265
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    torque

    No. 5250 is a constant, it does not change, when the rpm is 5250 and divided by 5250 the torque is the same as the hp. This applies to all engine, there are no exceptions! The torque peak is another...
  23. Thread: How many RPM's?

    by 194265
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    All engines

    This true for any and all engines. The formular for torque is HP x RPM divided by 5250. No matter what you got, you can't get around it. Just my .05 and I will stick to it.:)
  24. Thread: How many RPM's?

    by 194265
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    High RPM

    5250 is the rpm on a hp - torque graph where they cross and hp is the same as the torque reading. Just my .01 worth.
  25. Thread: How many RPM's?

    by 194265
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    Higher RPM

    I have to agree with sam on the inline six mercs. Compare the 1250 with the later sixes, both are cross flows, but different designes. The 1250 is the older designe and the later ones are Direct...
  26. Thread: How many RPM's?

    by 194265
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    RPM Band

    For many years OMC said the operating range for their outboards were 500 rpm below and 500 rpm above their rated HP. If the outboard was rated at 5000 rpm, then the operating range was 4500 - 5500...
  27. Thread: How many RPM's?

    by 194265
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    How many RPM's

    I agree with SS 201 on engines that are rated @ 6000 RPM. If your engine is rated at 5500 RPM or lower, I would say no more than a 10 % drop.
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    Evinrude SS

    Sam, send me your email address and I will send pictures.
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    The other side

    39064
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    1970 Evinrude Starflite SS Ad.

    Ran across this in my "old stuff" and thought some of you would like to see this. While working at Evinrude in the late 60's and early 70's a X-115 or one of these would show up in the plant for all...
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    more sandcast thunderbolts

    39030
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    more sandcast thunderbolts

    39029
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    more sandcast thunderbolts

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    more sandcast thunderbolts

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    more sandcast thunderbolts

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    more sandcast thunderbolts

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    more sandcast thunderbolts

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    more sandcast thunderbolts

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    The Sandcast Thunderbolts

    In the fall ‘89, I wrote this article about the sand cast Mercury thunderbolts, and it was printed in the April ‘90 issue of the Antique Outboarder Mag. I did this knowing that there would be some...
  40. Thread: 1972 Merc 115

    by 194265
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    115 Merc

    Thanks Sam :).
  41. Thread: 1972 Merc 115

    by 194265
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    1972 Merc 115

    Bought a '72 18' Thomson with a '72 Merc 115, it had been sitting out side for the last 10 years. I took it down and found it to bee in very good condition, no rust and all clean and shiny. The...
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    Takes more then just carbs.

    Unless you replace the 115 reed blocks with 135 blocks, I don't think you will notice any difference with just the installing 135 carbs.
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    More information

    After four days of eating turkey, drinking bottles of wine and seeing far to many of my outlaws, I'm back.

    I received the first crankcase and crankshaft for a 440 and put it together. Guess what,...
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    Following with more

    More information, but I need to go back to late Sept of '68. I was working on the second shift to keep an eye on several accelerated engine endurance tests. The reason being we had just introduced...
  45. Replies
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    And there is more

    I believe Cushman was spun of in the 80's, Cushman built 2 different engines while I was at OMC and they were both 4 strokes. One was a single cylinder rated at 9 hp and the other was an opposed...
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    Ah, the Blitz kit

    I don't believe so, the 600 JLO and the Rotax 377 (one year only for Ski Doo in 1967) where both three port engines. I believe OMC chose this because of its there long history with two cylinder...
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    More questions

    A methanol and caster oil mixed a 20:1 ratio was used on the Konig dyno run.
    The OMC opposed twin has a common crankcase w/out a full circle crank shaft and uses cracked rods. We referred to it as...
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    So many Questions

    Just remember that I am 67 years old (my god where did the time), and my memory is not the best. As far as I know, one day in November '69 the door open at the lab and a Konig was rolled in. Where it...
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    Konig meets OMC snowmobile Engineering

    Just a little back ground on this subject. In 1969 OMC introduced a 437 cc opposed cylinder snowmobile engine rated 25 HP. Now we all know (some of us anyway) that both Evinrude and Johnson have...
  50. Thread: My Kilo Motor

    by 194265
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    The first OMC snowmobile was built in Canada in...

    The first OMC snowmobile was built in Canada in 1965 and Engineering was moved to Milwaukee in late '66 or early '67. It was located at the new assembly plant on 64th street, four blocks north of...
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