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Old 06-27-2005, 07:28 AM   #1
den111
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Default Re: Monday's Science Lab: V-twin Engines 101

GREAT visual aid! Thanks much.
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Old 06-27-2005, 07:32 AM   #2
iamz
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Default Re: Monday's Science Lab: V-twin Engines 101

Cool. Now I know why my 52 degree Honda is so smooth.
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Old 06-27-2005, 07:40 AM   #3
sarnali
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Default Re: Monday's Science Lab: V-twin Engines 101

You forgot to illustrate the 360* vertical twin, that paragon of 4 stroke design from the drawing board of St. Edwin Turner
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Old 06-27-2005, 07:55 AM   #4
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Default Re: Monday's Science Lab: V-twin Engines 101

Very interesting, makes more sense now why Harley's "sound" a certain way. (Although I don't like it)



Also seems like a very inefficent engine design though.



I much enjoyed my R1200RT test ride, very smooth motorcycle.
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Old 06-27-2005, 08:29 AM   #5
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Default Re: Monday's Science Lab: V-twin Engines 101

That was a hot little engine in 1936! It worked great through the 60s and even made Yamaha copy it.



I still like 'em. I'll never forget the first time I pulled the head off my Triumph Tiger, pushed the kick starter through and saw the pistons come up together. I was sure something broke in the bottom end.



Years later, I learned about the concept of the twingle - a twin piston single engine and realized it was the natural evolution of the torquey singles of the thirties. Firing at 360 degree intervals was like mating two singles side-by side. It made for easy starting, had less mass and took less space than a V-twin and could be balanced to be smoother running. It was the perfect engine for light duty transportation before the car came along.
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Old 06-27-2005, 08:29 AM   #6
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Default Re: Monday's Science Lab: V-twin Engines 101

There is a legend that says Harley's design is the result of some incorrect calculations. I don't know if its true, but it feels like it.
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Old 06-27-2005, 08:38 AM   #7
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Default Re: Monday's Science Lab: V-twin Engines 101

You need to include the firing order along with crankshaft and cylinder angle to define the sound. Then there's all the other factors, valve timing, exhaust header size, muffling, etc.
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Old 06-27-2005, 08:44 AM   #8
grubz916
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Default Re: Monday's Science Lab: V-twin Engines 101

It's there, just scroll to the bottom. 0-deg crank, 0-deg cyl angle
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Old 06-27-2005, 08:45 AM   #9
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Default Re: Monday's Science Lab: V-twin Engines 101

Those were great kinetic schematics. It does make one wonder why V-twins still exist. They are big with overhead valves and especially with overhead cams, vibrate without couterbalancing or rubber mounting, and don't cool well in-line. And all those different designs show you why they basically are not a good design. But, they sure are fun!!
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Old 06-27-2005, 08:46 AM   #10
nokneedragin
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Default Re: Monday's Science Lab: V-twin Engines 101

I hate to take the grief for this, but HDs "sound" has always sounded more like explosive diarrhea.

Not a pleasant sound
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