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Thread: Name this lower unit
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02-01-2010, 06:20 PM #76Screaming And Flying!
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And That's No Bull
Sam the gears that are being made Could be expanded into SM and SSM gears as the tooling needed is there for the DS gear as the 75H prop has the same splines as the SM DriveShaft. Diff tapper.
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02-01-2010, 06:30 PM #77
At the cost of $700+ for the SM broach ... you gotta pay to play. As yet there is no interest in the SM gears
Both comments belong on another thread
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02-01-2010, 08:01 PM #78Screaming And Flying!
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We Should Allways
Read......SM the same as 75H Broach PS the splines on DS.
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02-01-2010, 08:33 PM #79
Not on the pinion shaft ... You of all people know the 75H driveshaft splines are the same as the Mk55H, not the SM
Its the prop shafts that are the same
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02-01-2010, 08:40 PM #80Screaming And Flying!
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Yes
Me of all fools Know that they are buying a broach to do the splines of the 75H prop shaft.... the same as SM and SSM driveshaft. Just giving ya a hard time. It's winter and tired of shoving snow.
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03-25-2010, 04:40 AM #81
This is not quite correct! In 1960 the regular OMC 75 had a high geared speedmaster-like shifting gearcase. They were faster than the Merc 800 with standard club foot, but not as fast as the Merc 800 with (2:3 geared) Sportsmaster gearcase. Anyone have a photo of the Sportsmaster? It was smaller than the 1975 OMC 75 'Nitro' gearcase used in EP/SE.
So 1960, from my experience in NOA, was the year that OMC reentered racing (also, don't forget Ralph Evinrude and Starflite I). I can tell you that, at the fall,1959 time trials at Three Rivers Boat Dock, there was nearly nothing present but a host of Johnson 75s on 13', 14' wooden Allisons. One upped the unlimited record to 56.5 mph, a speed unheard of at that time. It took us a year and the Sportsmaster gearcase for us to break 61 mph with the Merc 800 in NOA time trials.
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03-25-2010, 04:48 AM #82
Strang may have promised it in 1956 but they sat on their royal butts while first Scott (1958-'59) and then OMC (1960) gave Mercury fits in NOA. Both had smaller, higher geared gearcases. My dad begged and begged Oshkosh for the Sportsmaster, complaining about the huge 2:1 club foot, and they finally sent us a Sportsmaster with two props, 17" and 19" pitch, in Aug., 1960. After that, we really took off. Probably, it was Kiekhaefer sitting on his royal butt. I don't know how many Sportsmasters were made. We and Paul Allison (a Johnson man in 1960) had one at the Oct., 1960 NOA time trials, and we put them to good use.
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03-25-2010, 04:50 AM #83
Yep, that's it! And I used one to break 61 mph in Oct., 1960. Paul allison, my dad and I were the first in (NOA) OPC to break 60 mph. All with that gearcase.
By the way-we ran it on the boat shown in my photo, the 13' Allison with two Mark 58As. I ran kneel-down with my butt against the transom. Boat ran up to 55 mph, lifted, and on the way to 61 mph shimmied like crazy-no bungee tie-down on the downhousing. I was 17, my dad wouldn't let me run the boat before the time trials!
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03-25-2010, 07:08 AM #84
The Sportmaster bullet is 3 1/4" ... I don't think it is smaller than the Nitro or the other cases:
http://forums.screamandfly.com/forum...d.php?t=210654
1960 OMC's may have briefly been competitive, but they were by no means fast, nor a "racing" case. OMC was still run by Briggs in the early '60's. Those boats & motors you mentioned were personally paid for by Ralph Evinrude outside of the factory ... Ralph was interested in racing, but as a company, OMC was not. OMC stayed out of racing until 1967
The Sportmaster gear ratio & bullet size were not legal in NOA in 1960 ... are you 100% certain about the year?
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03-25-2010, 08:13 AM #85
I can tell you from personal experience that the 1960 OMC 75 would run. And, as soon as we got the Sportsmaster gearcase in Aug., 1960, it was approved by NOA (i.e., by Claude Fox). Mercury had sent them a bulletin stating the specs.
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03-25-2010, 02:19 PM #86
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03-25-2010, 03:52 PM #87
I remembered what that looked like. No one in my area could figure out how to get one over 35 mph. They must have been pretty tricky to get right.
Here's the copy of the ad from Hunn's book. I am clueless where it came from, I haven't come across it in any magazines I have from that time frame. Maybe its in an issue of NOA's Roostertails that I do not have, or maybe its a stock blank that was sent out to dealers for local use.
The WOA ad was a few years later and is in Yachting, Motorboating and others.
Like Joe says, WOA was a west coast/Arizona organization and NOA was heavier in the southeast ... NASCAR's old homeland.
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03-25-2010, 04:42 PM #88
Are you confusing the 1960 75 with the 1958 Fat 50? The latter wouldn't do 35 mph unless you pulled it, the 75 would run nearly 50 mph on a Crosby-like runabout, was faster than a Mark 78.
Here's a picture of that disgraceful excuse of a motor. Same gearcase as the 1954 Johnson 25, just (like the rest of it) fatter.
Last edited by smokin'joe; 03-25-2010 at 05:00 PM.
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03-25-2010, 04:58 PM #89
No, there were practically no fat 50's in our area. I was always impressed by the looks of the 75's.
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03-25-2010, 05:09 PM #90
Was easy to bust 50 mph with an OMC 75 on a fast boat, was pretty hard to do that with a Mark 78, and was impossible with a Scott 60 unless it was juiced up by someone who knew what he was doing-like McCulloch Corp.
And, the 52 mph 13' Rose was the fishing version, probably didn't weigh 150 lb. That was basically the same boat bottom that ran 50 mph with the Merc 500, after molded by Allison in 1961 (and the Merc 700 wasn't much faster).