I am keen to know if there's any difference in the bore/stroke and subsequent torque numbers of your build compared to the new engine. I see Triumph are claiming 'world's most ' blah blah blah but lets face it, there's bugger all increase compared to the 2.3
Well the 2.5L stoker is 2472cc, bigger than the new Rocket engine. 101.6 x 101.6mm, a square engine like a Veyron, Viper, Supra, etc.
In theory, the displacement is increased by 8% so that means 8% more air which means 8% more power.
However that's assuming the same volumetric efficiency etc. Since the displacement increase is due to stroke only, i would estimate that this might lower volumetric efficiency in % relative to engine size slightly, meaning not quite 8% increase in power but maybe 5-6% increase.
But i do expect 8% or more increase in torque, owing to the increased stroke. Possibly lower in the rpms than stock too, i don't know, just estimating. Expecting more vacuum low down too maybe that means better throttle response.
It will be interesting to see the dyno graph when it's done.
The bore x stroke of the new engine is 110.2 x 85.9mm which calcs out to 2457cc rather than their advertised 2458. I read on visordown that the new engine max power of 179 horses is made at 7000rpm.
Was expecting an increase in torque but the initial launch stats said 221nm which is the same as the old bike, and now the "actual" stats say 165 ftlb, or 224nm.
Either way, the increase in tq is disappointing to me.
With this spec engine i became apparent they've gone for a sportier / revvier engine than the gen 1.
So when these new stats came out (
Triumph Rocket 3 TFC power and specs confirmed) the last day or 2, it was no surprise that the max tq is at 4000rpm rather than 2750rpm like the old Rocket.