Ideas Factory/ the foundry

29 on the go · 3 materials
nothing here is finished

The engine bay with the front-hinged carbon bonnet raised, in British racing green. A polished, belt-driven supercharger and plenum sit on a V engine set back in a tubular spaceframe, with an aluminium radiator and chargecooler ahead of it at the nose. Light blades glow in the wing, and the brass grille surround and 6 roundel are in view. Off brief: the engine cover is lettered V6 12000, which nothing in the brief names.

← the floorKreation Silhouette/parts·if / 070

Engine

Two Triumph 1160 cc triple top ends on a bespoke billet crankcase and six-throw crank, making a 2,320 cc 60° V6 with a centrifugal supercharger, for a target of 420 bhp at 10,750 rpm.

The card

parts 03 of 07

Engine

parts 03 of 07idea_070

The notes

rendered

The engine is the reason for the car: two high-revving motorcycle triples joined on a common crank as a 60° V6, with a supercharger.

specification

Item Specification
Layout 60° V6, front-mid mounted, dry sump
Donor parts Two Triumph 1160 cc triple top ends: heads, cylinders, pistons, rods, valvetrain
Bespoke parts Billet crankcase, six-throw crankshaft, cam drive, sump, intake plenum
Capacity 2,320 cc (2 × 1,160)
Bore × stroke 90.0 × 60.8 mm
Compression Around 11.0:1 (donor is 13.2:1, lowered for boost)
Induction Belt-driven centrifugal supercharger, liquid chargecooler, plenum in the vee
Boost Around 0.4 bar at peak, rising with rpm (est.)
Power 420 bhp at 10,750 rpm (target)
Torque 300 Nm at 9,000 rpm (est.)
Redline 11,000 rpm
Engine weight Around 120 kg dressed (est.)

why centrifugal

Boost builds with revs, so the engine keeps its free-revving bike character and the top-end scream, while adding power where it is used. A twin-screw blower would fatten the midrange but blunt the rev-happy feel.

joining the engines

Two bike engines cannot simply be bolted together. Builders such as Hartley have done this before, with Hayabusa heads on a custom billet crankcase, and that is the model here. Budget for real development time.

Donor figures are from Triumph's published Speed Triple 1200 RS specification: 1,160 cc, 90.0 × 60.8 mm, 13.2:1, 180 PS at 10,750 rpm and 125 Nm.

The drawings

1 sheet
Blueprint-style engine cross-section. Two three-cylinder banks, A and B, each with a 90 × 60.8 mm bore and stroke, stand at 60° on a shared crankshaft. The boosted plenum sits in the vee between them, on a bespoke billet crankcase with a dry sump.
01 · Blueprint-style engine cross-section

The plates

1 · lift any one out
The engine bay with the front-hinged carbon bonnet raised, in British racing green. A polished, belt-driven supercharger and plenum sit on a V engine set back in a tubular spaceframe, with an aluminium radiator and chargecooler ahead of it at the nose. Light blades glow in the wing, and the brass grille surround and 6 roundel are in view. Off brief: the engine cover is lettered V6 12000, which nothing in the brief names.
01 · The engine bay with the front-hinged carbon bonnet raised