A+5. The results for both heads as a straight shoot out.
The 1st engine test used the BMW K1200 RS head straight off the bike.
BHP 154.4 @ 8150 RPM
Straight line torque curve from 6000 to 8150 rpm @ 103 Lb/Ft
The 2nd engine test used the SC BMW sprint head and throttle bodies.
BHP 158.2 @ 7900 RPM
Torque 110 Lb/Ft @ 7100 RPM
I will state that this is all about the 5 main bearing billet short block assembly and what can be achieved when bolting the standard BMW K1200 RS head straight off the bike and then what can be achieved with the SC sprint head with only a head skim to improve the compression ratio.
Please note! The sprint head is normally used on a 1380cc displacement so at 1273cc there will be a difference on how it performs as a shorter stroke N/A engine.
The engine was revved to 9,250 RPM but both heads don’t breathe well enough to produce any power above 8,200 RPM when using the 75.00 mm short stroke crankshaft with rods having 150.50mm centers giving a rod ratio of 2:1
The Ascaso billet block short assembly has been designed to be either Turbo charged or N/A with only a change of pistons required to suit applications.
We are now at the starting line with testing completed and engines ready for sale, Kent Auto Developments – KAD have been fantastic supporting us through the development stage of the project and are now a distributor of the engine with many exciting things to come as they develop the platform in conjunction with their Gen3 16V cylinder head.