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Offline Quinn

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Firing order
« on: May 11, 2013, 04:09:00 AM »
The only information on the Trophy's engine is that the firing order is 1,2,3.  I'm curious to know if it's a symetrical sequence (720/3= 240) with a power stroke every 240 degrees of crank.  In the vertical twins usually the pistons move up and down together with the power stoke alternating sides , in horizontal twins the pistons fly in and out together; both  have a power stroke every 360 degrees.  Harleys and a lot of v-twins have an offset firing pattern which gives them that distinctive potato, potato sound; two quick fires and a longer dead period.  In-line 4s do it as two pairs of pistons that move up and down together to allow a power stroke every 180 degrees of crankshaft. 

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Offline nert

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Re: Firing order
« Reply #1 on: May 11, 2013, 04:56:35 AM »
Yes it is. the crank throws are spaced 120 degrees apart. Perfect balance, minimal vibration. A little sided to side rocking may be noticed. Triple is the best, smoothest configuration. A problem with the 4 cylinder is, the pistons stop at the the bottom and top at the same time. Jerking and twisting the crankshaft. The power on the triple is more linear. Triples are the best!! In spite of the windscreen, fuel tank, and fork seal failures, the Trophy engine is AWESOME.

Offline saaz

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Re: Firing order
« Reply #2 on: May 11, 2013, 07:54:02 AM »
It is also a Désaxé design http://www.ashonbikes.com/content/d%C3%A9sax%C3%A9-engines

" désaxé (technical feature here: the cylinders are offset from the crank centreline by 6mm) "

Don't know if this makes much difference as well.
« Last Edit: May 11, 2013, 07:57:40 AM by saaz »

Offline nert

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Re: Firing order
« Reply #3 on: May 11, 2013, 03:23:24 PM »
I didn't know the Trophy had the crankshaft offset as well. One of the most popular engines i can think of that used the désaxé design was the old Dodge/Chrysler/Plymouth "slant six". Those engines where very reliable and saw lots of miles for the times.

 


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