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Old 05-20-2009, 05:10 AM   #11
Kenneth_Moore
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"A 270-degree firing interval essentially turns the motor into a 0-degree V-Twin"

I guess I should have read the homework assignment Mr. Duke, but I don't understand what you mean. Can you elaborate on this?
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Old 05-20-2009, 05:16 AM   #12
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It means they staggered the firing order to simulate a V-Twin firing sequence without the cylinder arrangement. The traditional Triumphs had 360-degree firing order. One cylinder fired every revolution. It had a very even exhaust sound. The 270 gives is a bit of 'potato-potato' sound.
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Old 05-20-2009, 07:10 AM   #13
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It means they staggered the firing order to simulate a V-Twin firing sequence without the cylinder arrangement. The traditional Triumphs had 360-degree firing order. One cylinder fired every revolution. It had a very even exhaust sound. The 270 gives is a bit of 'potato-potato' sound.
Yeah, but with the restrictive sound standards these days, who would notice? Especially after Calif passes their yearly inspection law for bikes and all those aftermarket exhaust companies go out of business.
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Old 05-20-2009, 07:19 AM   #14
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Not to be overly persnickity but a 360 degree firing interval is the same as a 0 degree firing interval as there's 360 degrees in a circle, a 270 degree is ...well, 270 degrees and I might add an abomination in the eyes of God hissef' as prophisised by the Messiah Edwin Turner. A 360 degree firing rate is the only acceptable configuration for a British vertical twin.
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Old 05-20-2009, 10:51 AM   #15
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Quote:
Originally Posted by longride View Post
It means they staggered the firing order to simulate a V-Twin firing sequence without the cylinder arrangement. The traditional Triumphs had 360-degree firing order. One cylinder fired every revolution. It had a very even exhaust sound. The 270 gives is a bit of 'potato-potato' sound.
So they make a point of not building a V-Twin, and then build the inline twin to sound like one. Schizophrenic. It will never sound like a Shovelhead, so why even bother?
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Old 05-20-2009, 11:14 AM   #16
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So they make a point of not building a V-Twin, and then build the inline twin to sound like one. Schizophrenic. It will never sound like a Shovelhead, so why even bother?

Just because they didn't want it to look or sound EXACTLY like a Harley doesn't mean they don't want it to kinda look and sound like one. After all, the guy that designed this did the Rune. He learned a hard lesson on THAT one!
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Old 05-20-2009, 11:38 AM   #17
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Just because they didn't want it to look or sound EXACTLY like a Harley doesn't mean they don't want it to kinda look and sound like one. After all, the guy that designed this did the Rune. He learned a hard lesson on THAT one!
Don't forget he did the Rocket3 also. That makes it 0 for 3. Time for a new career.
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Old 05-20-2009, 11:46 AM   #18
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Not to be overly persnickity but a 360 degree firing interval is the same as a 0 degree firing interval as there's 360 degrees in a circle, a 270 degree is ...well, 270 degrees and I might add an abomination in the eyes of God hissef' as prophisised by the Messiah Edwin Turner. A 360 degree firing rate is the only acceptable configuration for a British vertical twin.

Actually, the firing interval in a 360 degree vertical twin is, indeed 360 degrees. The crank has to turn 360 degrees, not 0 degrees, before the second cylinder fires.

A 0 degree firing interval would be a "twingle".
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Old 05-20-2009, 12:35 PM   #19
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One more explanation and I will be completely lost. Wait, I already am.
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Old 05-20-2009, 12:45 PM   #20
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A 0 degree firing interval would be a "twingle".
i.e. - both pistons on the same crankpin, with intake, exhaust, and combustion events occuring all at the same time...............
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