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Building Tips and technical articles. => 1/2 A building. => Topic started by: Tim Stagg on February 24, 2019, 02:20:48 PM

Title: Will TD's run either direction?
Post by: Tim Stagg on February 24, 2019, 02:20:48 PM

I know they will start either direction, but do they perform equally either way?

Thanks

Title: Re: Will TD's run either direction?
Post by: john e. holliday on February 24, 2019, 02:31:25 PM

They are a shaft induction system and should only run great counter clockwise.   Just like standard shaft induction engine you need to retime the shaft to get them to run clockwise.   That is if you are standing in front of the engine.   Reed valve engines will run either direction. D>K

Title: Re: Will TD's run either direction?
Post by: bob whitney on February 24, 2019, 03:09:17 PM

they made a left hand crank for the TD for speed. then u would need a L H prop

Title: Re: Will TD's run either direction?
Post by: Tim Stagg on February 24, 2019, 04:24:09 PM

Thanks guys that is what I needed to know.

Counterclockwise it is  8)

Title: Re: Will TD's run either direction?
Post by: Fredvon4 on February 25, 2019, 10:14:57 AM

WHY

LH cranks frequently come upon the e-bay... I had several...now down to one I am keeping

I never saw any Medallion LF cranks all I ever found were the square intake TeeDee versions

Not sure if Paul Gibeault still has any in his junk barrel or Mike Hazel

Title: Re: Will TD's run either direction?
Post by: Larry Renger on February 26, 2019, 09:35:03 AM

 I actually have one left hand crankshaft I think they were very unusual.  H^^

Title: Re: Will TD's run either direction?
Post by: Tim Wescott on February 26, 2019, 10:02:36 AM

The typical high-performance shaft induction system will run either way because the induction opens early, to give the crankcase time to fill when the engine is going fast.  But they don't run at all well in reverse.

One of the compromises that "sport" engines like the LA series makes is to make the induction open later.  This makes it much easier to hand-start the engine and have it go forward, but it limits the top speed.

You could make a rotary induction engine run equally well in forward or reverse, by placing the induction hole (or disk or drum) so that it opens equally on both sides of top dead center -- but if you did that, you may as well use piston timing.