She's finished.
Titanium 2.5 Engine
Supertec has decided to build an "old school format with a modern twist". The base platform is a 2.5 liter, MFI, twin plug engine. The twist is this engine uses GT3 Gen 2 titanium rods and a new peanut shaped combustion chamber.
Why, we wanted to build an 8500 RPM high compression engine that would run on pump gas.
Twin plugging helps with low octane ratings but the new innovation is to replace the standard Porsche hemmi head with a more modern peanut shape chamber. This allows us to run a relatively flat top piston to generate high compression. This one will make a static compression of 10.25 to 1.
We start:
68 aluminum case
shuffle pins
piston squirters
boat tailed (I know, boating makes no measurable difference, but this case was boat tailed when I got it)
oil bypass modification
oil mod for cross drilled crank
Dry film Moly coating on main bearings
Distributor mount modified for late shaft
Mounts welded for MFI pump
Oil pump
Supertec flow modified Carrera pump
Crank 2.2 counter weighted
Cross drilled
Knife edged
Journals ground to 53 mm RSR with .100" fillets for strength (GT3 bearings, dry film moly coating)
GT3 Gen 2 titanium connecting rods (130mm center to center)
911 SC distributor gear (counter clockwise rotating)
Ion plasma surface hardened
Pistons and cylinders: Mahle 8.5:1, 90 mm RS
Supertec head studs
Heads:
2.4 heads with MFI injector ports
Peanut chamber (51cc)
Big valves 47 mm intake and 41 mm exhaust
38 mm Venti Port intake
37mm exhaust port
Heads have been shaved .040" and a .040" dimension shim added. This a shim placed between the head and cam tower to return a shaved head to proper thickness.
Supertec valve springs (90lb seat pressure and 220lb @ .500" lift)
Aasco titanium valve spring retainers
