What is Dual Shaft - Snowblower Forum : Snow Blower Forums
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post #1 of 24 Old 01-14-2018, 09:31 AM Thread Starter
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What is Dual Shaft

I'm fairly mechanically savvy, I can do a whole lot. Built a few cars, working on these snowblowers, etc..

What I do not understand, but have heard reference to, is dual shaft machine. I'm not sure what's meant by that.

I'm sure it's a simple thing, but drives me nuts when I don't understand a term.
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post #2 of 24 Old 01-14-2018, 09:50 AM
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Engines where the cam also has an output shaft for driving the traction assembly; convenient since it runs 1/2 of the crankshaft RPM.


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post #3 of 24 Old 01-14-2018, 09:52 AM
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It means it has two shafts.

Sorry I have no idea what it really means, just couldnít resist.
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post #4 of 24 Old 01-14-2018, 09:56 AM Thread Starter
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Quote:
Originally Posted by classiccat View Post
Engines where the cam also has an output shaft for driving the traction assembly; convenient since it runs 1/2 of the crankshaft RPM.
The replacement engines I'm familiar with, and my knowledge of these things is limited as compared to the enthusiasts here.

I get the 2:1 ratio. It's too early but I have to wonder how that effects torque at the wheels. I have to think with the cam going around 1/2 as much, you'd use a bigger pulley, resulting in more torque? I have to draw that one out.

Does the cam "shaft" come out of the front or back of the engine? Same side as the engine crank? If you do a repower, and only have a single shaft, can you adapt either the machine, or the engine?

Just wonderin.
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post #5 of 24 Old 01-14-2018, 09:56 AM Thread Starter
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Originally Posted by vmax29 View Post
It means it has two shafts.

Sorry I have no idea what it really means, just couldnít resist.
And I thought this was going to be complicated.
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post #6 of 24 Old 01-14-2018, 09:57 AM
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Quote:
Originally Posted by vmax29 View Post
It means it has two shafts.

Sorry I have no idea what it really means, just couldnít resist.
But thatís EXACTLY what it means

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post #7 of 24 Old 01-14-2018, 10:02 AM
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The second shaft runs 'backwards' so repowering a machine with a single shaft will require a bit more work. Without modifying the drive or linkage you get 3 or 4 reverse and 1 or 2 forward speeds. It can be done, it just requires a bit of forethought. The dual shaft motors are common on rototillers too. This is a Briggs but Tecumseh engines are very similar.
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post #8 of 24 Old 01-14-2018, 10:02 AM
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I honestly didnít get it either. There was a picture in a post referring to it a while back and I was wondering how that worked.
Interesting.
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post #9 of 24 Old 01-14-2018, 10:06 AM Thread Starter
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Quote:
Originally Posted by deezlfan View Post
The second shaft runs 'backwards' so repowering a machine with a single shaft will require a bit more work.
Ah ok. Are there conversions for re-powers on replacement engines or are you just relegated to rebuilding the dual shaft?

Is this new technology or new technology? Is it still used? I also note on my internet search, that they're also used in tillers and other equipment, and it seems like it's old tech, not new. Am I wrong?
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post #10 of 24 Old 01-14-2018, 10:16 AM
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It may be considered old tech but not because it didn't work. I imagine it is no longer used because it was more expensive to make and other ways were found to do the same job with out the added complication. I still see plenty of twin shaft engines for sale used so there's no need to convert your equipment.
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