Kenneth_Moore

"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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longride

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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seruzawa

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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sarnali2

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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Kenneth_Moore

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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longride

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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seruzawa

Don't forget he did the Rocket3 also. That makes it 0 for 3. Time for a new career.

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pplassm

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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Kenneth_Moore

One more explanation and I will be completely lost. Wait, I already am.

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The_AirHawk

i.e. - both pistons on the same crankpin, with intake, exhaust, and combustion events occuring all at the same time...............

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