lol..
It will be finsihed when its finished ... Its really starting to come together now though.
Status as of today..
Block and Head
- at engineering shop.. turbo oil feed has been drilled into block. 172 Head having detonation marks tig welded and resurfaced, also redrill 2 holes for inlet manifold bolts. Acid clean both. Block awaiting pistons. being bored to 83mm (Cant be done before pistons arrive as they are custom made forged). Piston oil spray jets are being replaced as a matter of course, block face will be cleaned at 4 thou.
Manifolds
Exhaust manifold port mathched to 172 head (done)
Inlet manifold has had 4 extra injector bosses welded to tracts for boost fueling. TB end has been removed and ready to weld in 172 TB mount. Port matching to head will follow. Extra hole drilled for 2nd 3bar map sensor.
Pistons
Now being made from scratch from forged blanks (Omega) CR= 8:1 (ish..)
Diameter altered to 83mm from 82.7 for greater choice of piston rings.
Turbocharger
Following the above calcs, a new compressor wheel has been sourced. My local engineering firm will mod the core housing and comp housing to suit.. then it will be polished and ported. Turbine inlet to be ported.
Oil system
The most often overlooked area of turbo charging.. a custom oil separater has been sourced. All engine vents taken to the sep unit.. outlet fed to induction side of turbo compressor. Oil feed to turbo sorted, oil drain to sump needs a 5/8ths ali tube welded to sump wall .. need to measure under car to clear driveshaft.. Oil cooler (Thermostatic) modded to suit block (172) Oil rad obtained and pipework will be made once unit is fitted.
Fuel System
Hopefully the fuel pump wil supply enough to feed the second injector bank. (Aint looked at this in detail yet) otherwise an additional pump will be fitted.
Crank and rods
Crank is F4R turbo unit (new) rods are std. awaiting clutch then rotating assembly will be balanced.. rods matched and pistons matched. Bearing will be sourced once all machining is done.
Clutch
Bit tricky lol... but looking at either a paddle clutch or a porche 911 modded st2 cover (270 foot pounds)
Intercooling
Probably go for a charge cooler but depends on whats available that will do the job effectively. Need to work out temp differentials and pressure drop.
Electronics
to follow.. watch this space lol..
Joe.
now we is getting to the fun bit..
