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Post by weverat on Aug 1, 2016 16:27:59 GMT -5
  I can only post 2 pics at a time, you have to click to make them bigger. The first one is a 1960 Harley Hummer built into a flat track racer, Bultaco tuner pipe, and a Cat EXT 340 cylynder head. The next is an old Bultaco Model #181 Frontera with home built twin carbs (2 into one)? I have not yet run this engine, or the twin carb set up although, I do have a good running Frontera to try it on. I am sure the performance would not be improved, it would be for novelty only. Anyhow, I love building or finding these old "Freak Engines" |
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Post by weverat on Aug 1, 2016 16:43:30 GMT -5
  ok, This one is a, or better yet, was a 370 Sachs, owned and built back in the day by a gentlemen named Duke French. Originally 79 x 75 fan cooled, now 85.5 x 75 free air! It has a Bultaco piston with extra long skirts welded on, and finger ports ground into the cast iron cylinder sleeve. Duke ran it on alcohol. I actually ran this engine in a Bubble nose chassis 20 years ago, with no hood and pump gas. It seized up about every 300 yards,as It just would not cool. I may have had a chance with alcohol, a hood, and some air scoops? Ol' Duke has become shop art for now, but maybe someday? |
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Post by weverat on Aug 1, 2016 16:46:58 GMT -5
  Check out the nice weld job on the skirt extensions These ol' guy's had savvy! |
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stinger4me
L3 The Proven Snowmobile that never lets you down
Posts: 108
Location!: East Central MN
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Post by stinger4me on Aug 1, 2016 22:04:28 GMT -5
What's the piston cylinder clearances?
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Post by weverat on Aug 2, 2016 5:44:01 GMT -5
.009
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ericr
L1 Scorpion - The Great Snowmobile
Posts: 10 
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Post by ericr on Aug 4, 2016 17:25:26 GMT -5
That's pretty neat stuff! I will admit I have seen a hole in a piston crown welded before but not skirt extensions!
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Post by 80sting440 on Aug 4, 2016 18:15:16 GMT -5
Cool stuff...personally, I don't like extended skirts.
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Post by weverat on Aug 4, 2016 20:45:49 GMT -5
I thought you guy's might wonder about the clutch?
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Post by 80sting440 on Aug 4, 2016 21:42:09 GMT -5
There's no wondering in my mind...it makes sense to me!
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Post by weverat on Aug 4, 2016 22:47:59 GMT -5
But is it a factory experimental thing, or did Duke make the modification himself? I have not taken it apart yet, but I think I have seen one like it somewhere?
Is this a Scorpion or Salsbury ?
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