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General control line discussion => Open Forum => Topic started by: rustler on September 28, 2006, 06:14:56 PM
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Can anyone confirm the true displacement of the big case Johnson SS? I always thought it was a 33, but friend insists it is the small case Johnson which is 33.
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Can anyone confirm the true displacement of the big case Johnson SS? I always thought it was a 33, but friend insists it is the small case Johnson which is 33.
The "Stunt Supreme" (small case) is a .33 (.32??) and only has "SS" on the side.
The "regular" (big case) is a .35. I have one of those and a CS .35
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The Stunt Supreme (SS), and Combat Special (CS) are both 35's. The small shaft Stunt (S), is a 32. I have them all.
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I have one of each also, well maybe more than one, but Phil is correct.
Walter
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Actually, the small case "S" stunt engine is a .33 rather than a .32. The bore and stroke of the Johnson small case engine were:
29 .718 bore and .718 stroke
32 .750 bore and .718 stroke
35 .770 bore and .750 stroke
S .770 bore and .718 stroke
The S was in fact a 35 piston and cylinder in a 29 case. A by product of this combination was that the compression ratio was dropped from 11.2-1 on the 35 to 6.5-1.
The .32 compression ratio was 8.1-1, so it did have a better stunt run than the .35 but not as good as the S.
I have a .32 in an old Ringmaster, and it makes a lot of power but doesn't like running in a 4 cycle. The S will run a 4 cycle.
Steve
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The Stunt Supreme (SS), and Combat Special (CS) are both 35's. The small shaft Stunt (S), is a 32. I have them all.
Hi Phil,
Thanks for that, I got mixed up somewhere. I don't have a "Stunt Supreme", just remember looking at them.
Odd thing is, I have a CS and another "Big Case" Johnson that is a .35, but it doesn't have the SS on it. (???)
Don't know exactly "what" I have but it's a solid runing engine!
Bill <><
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Thanks everybody.
For Bill - I believe most big case Johnsons have the model ID on the small raised circle, e.g. R/C, CS, SS. But the only ones I have seen with nothing on the circle are CS's. One like this is the first Johnson I ever bought. It was bought as a CS and from the way it runs it is definitely a CS!. :)
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The ones with a milled plain circle are either the early 36BB or the Sport Special. They have rounded cyllinder fins.
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There is a big case Johnson on e-b at the moment. Originally called a 29, now revised to 32. Was there a big case 32? Could it be the big case SS 33 I thiught existed? ::)