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12-22-2002, 05:33 PM #1
The evolution of the Super Speedmaster
ALL OF THESE UNITS PICTURED HERE WOULD HAVE BEEN AVAILABLE SOLID BLACK ONLY. ALL OF THE PAINT REMOVAL WAS DONE BY OWNERS. The paint in the second picture is partially removed by bead blasting.
The first picture is the MC1 (Mercruiser 1), also referred to as 1 SSM and "Marathon". As the name implies it was originally designed for the Mercruisers, which were all small blocks at the time. This unit was available in at least 2 driveshaft configurations, the very short, fine splined one for the Mercruiser drive and the 15" one for a standard short shaft Merc. These were standard on the first Twisters before the SSM became available.
Notice how much larger it is than the others in this series and the exhaust outlet has the large opening and slanted angle. Also, not as plain in this picture is the large "Patent Pending" above the cavitation plate. Another sign of this unit is the skeg's trailing edge position being rearward in comparison with all the others. Another unique cosmetic detail is the rear edge of the area above the propshaft and below the cavitation plate. It is approx. 1/2" thick in this area while the other units taper back to a sharp edge.Last edited by Raceman; 12-22-2002 at 05:57 PM.
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Jimboat liked this post
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12-22-2002, 05:35 PM #2
This is the first style SSM housing that was used later on the Twister and Twister 1. Notice that the torpedo is much smaller and the exhaust snout is uniform to the rear of the outlet. It has the shim inspection plate and is round at the rear of the cavitation plate. This unit uses the small propshaft like the MC1 but has the smaller gears.
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12-22-2002, 05:38 PM #3
This is the next generation. It's very similar to the previous one except for the exhaust snout. Notice that it's now offset for prop clearance, but still opened at the rear of both levels. This one also still has the same shim inspection plate. Most of these units that I've seen were on T2's and maybe T2X's. Although this particular example has a 6 bolt adapter that would have been used on the T2X or early 6 bolt T3, I don't think this style unit was ever used after the pre X 15" T2.
The adapter on this unit is obviously a home built, being much thicker in the front than the factory unit. This would've facilitated removal of the spacer at the top of the early champ housings that was used when a V6 powerhead was run.Last edited by Raceman; 12-22-2002 at 05:50 PM.
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mrcrsr liked this post
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12-22-2002, 05:41 PM #4
This is the last of the SSM series, before the introduction of the #IV and # VI. The cavitation plate is now square across the rear. The exhaust snout is closed on the lowest level at the rear, and the inspection plate is gone. These units were used on the latest T2X and 1750XS/T3. This particular unit has the 8 bolt adapter like was used on the second design T3 housing. The front studs are missing. There was never an 8 bolt housing factory installed on a T2X although I've seen at least one that was retro fitted. I believe that by the time the 6 bolt housings were replaced by the 8 bolts the factory boats were already running the 4's and 6's, which were direct bolt ons to the 8 bolt housing, not requiring an adapter, and these adapters were probably retro fits for privateers who were having breakage problems on existing engines, rather than ever being factory equiped on an engine that was sold.
Last edited by Raceman; 12-22-2002 at 05:48 PM.
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12-22-2002, 10:21 PM #5
RM, Well sence were on the subject, Did Merc have a torque spec. for the prop nut? With that spring washer, It made me wonder how tight it should be.
DaveW
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12-28-2002, 08:47 AM #65000 RPM
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Thanks!
Thanks for the illustrations of the evolution of big Merc high speed gearfeet! Many of us know the little ones - KG-4H, 20H, 30H, & 55H, and seeing what that earlier technology led to is really fascinating.
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04-17-2006, 09:35 AM #7
Here is yet another variation of the super speedmaster. Note the long exhaust, the absence of curves on the housing to the shaft, and the "patent pending" in the casting.
Last edited by bridges; 04-17-2006 at 09:46 AM.
Scott
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04-17-2006, 12:59 PM #8
cool post RM, its good to see the visuals and the differences.
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04-17-2006, 01:24 PM #9
That is great, thanks Raceman
“The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”
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04-17-2006, 01:57 PM #10
What am I? Chopped liver? Kidding. This is an old thread that I revived to show pics of another early configuration of the Super Speedmaster. I posted this on another thread too, but it really belongs here, so here is a April 1965 Bulletin on the "new" Super Speedmaster:
Scott
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04-17-2006, 02:10 PM #11
Exploded view. Kind of small because of the posting requirements.
Last edited by bridges; 04-17-2006 at 02:14 PM.
Scott
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04-17-2006, 03:20 PM #12
Sorry these old links are now broken, so I deleted them
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04-18-2006, 07:44 AM #13
Nice, thanks.
Scott
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06-11-2013, 06:22 PM #14
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06-11-2013, 09:24 PM #15