I like the power delivery of a 360 degree twin.
Firing order is important. The reason that Triumphs made such good dirt bikes
is that the firing?angle is symmetrical...every 180 degrees. Bang
chuff bang chuff and so on. Thus you get a regular bang on every revolution,
at the same place...just like a two stroke single....
?
180 degree crank bikes don't have the same
firing,...they're either bang chuff, chuff bang, or bang bang chuff
chuff. It feels different and not entirely 'right' to me.
?
It's like the difference between a 120 degree
triple and a typical four. The Triple always has a totally different
feel...somehow more appropriate to a motorcycle...It might be something
to do with the regularity of power pulses when the bike is at the limit of
traction...I don't really know, but certainly 360 degree twin dirt bikes put
power down in a very controlled way.
?
Four stroke single dirt bikes are better than two
stroke singles at getting power down initially as they punch out of corners
and that is entirely down to the fact that the bikes composure has time to
settle in-between pulses and the regular rhythm?of the pulses allows the rider to 'sense' the rear tyre's behaviour .
360 twins are the same but you need long stroke lower revving?motors to
ensure the pulses are far enough apart.
?
If they could make them light enough, I would not
be surprised to see four stroke 360 degree twins competing again in top level
MX because they make more power than a single with similar bottom end grunt.
?
As you say, you need to add 1000 rpm to
everything...That doesn't work 'off-road' and the edge of that difference
is what I sense 'on-road'.
?
?
I've no doubt your bike??fuels
smoothly, revs higher, makes more power and all that, but?all 180 degree
motors ?'feel' slightly wrong to me...irrespective of build or brand.
?
Jon
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