Penguinracer

Torsion Bar Carrier & Spring Plates

Penguinracer

Torque Tube with new bearings

Penguinracer

New wheel bearings & CV joints throughout.

Penguinracer

Reconditioned transaxle, Guard 50/80 LSD & rebuilt transmission. LR Ultra mounts used for transaxle. LR adjustable engine mounts & billet torsion carrier mounts also used.

Penguinracer

Recaro Classic Pole Position ABE in leather. Mounted on Recaro mounts & sliders with 964 RS seat belt receiver "L" bracket (P/N 964.521.065.00) & Porsche seat slider spacers (P/N 999.025.231.03)

Penguinracer

Better view of Dailey Engineering 2-stage dry-sump pump with AOS. Custom designed billet crank pulley machined so as to turn the dry-sump pump, power steering pump & alternator at the appropriate rates respectively.

sherry66

Thanks Penquin , shots of dry sump layout always helpful .
Any worries using twin pumps rather than one running lean ?
I too hate the idea of being stranded far from home , so having built the car myself , I always make sure never leave home without my AA Breakdown card !

Penguinracer

Sherry, the twin pumps operate in parallel.
The Emtron will be able to limit boost if the fuel pressure drops, temperature increase, cylinders run lean or the AFR changes. The ECU will have other safeguards programmed in like engine shut down for oil pressure drop (e.g DS pump belt failure etc) or high coolant or oil temperatures.

The interior will be as near stock as possible part from the seats, micro display & AFR LED & black alloy Rennline pedals with black rubber pads & black extensions on the adjustable throttle pedal:
https://www.rennline.com/rennline-re...ku-a12-1p6053/

I've also got a new Porsche front under tray protective plate & a Rennline Aluminium Skid Plate for protection & to improve under car air flow:
https://www.rennline.com/products/po...r/skid-plates/

Reliability & durability is more important to me than another 100 bhp

I'm hoping that what will distinguish this build from faster new cars will be its ability to circulate continuously for longer periods without overheating its oil, brakes, cooling system or tyres.

Penguinracer

Our dry-sump schematic is more like this but using a spin-on oil filter rather than a 75 micron scavenge oil filter in the oil return line & having a thermostat for the oil cooler:

https://www.lindseyracing.com/instru...WSep%20New.PDF

blade7

I wonder how much difference, bolting on the head from a 2.5 16v engine would make...

Penguinracer

The 16 valve concept really only crossed my mind when I was too far down the 8 valve route for it to make economic sense to change direction.
I'd want custom cams & a twin pulley system with inconel valves which would only add more cost on top of everything else for power I don't need.

I can see the attraction of simpler lower-budget 16 valve build (stock valves, single pulley cam set-up, stock head etc) which would give the same power as a high-end 8 valve build but at lower boost pressures & possibly without having to spend as much money on thermal management.

The bottom line is that this will be powerful enough for my purposes & I'm hoping that dry-sumping, the AOS pump section, extensive oil cooling & the bore stability of the Darton MIDs will
ensure reliability.

The 8 valve head may not be the most efficient but it is robust with a good size seat area for heat transfer and strong, albeit thick-stemmed, valves.

As I'll be running pump fuel and very rarely race fuel or an octane enhancer and not E85, I'll be boost limited to a max of circa 18 PSI & as the SR8-14 cam is optimised for 4400 - 6900 rpm I'm hoping that it will still be increasing in output at the stock redline, which is the limit I'll observe to ensure durability.

blade7

All being well, I'd guess around 430-440 bhp at the crank for your engine, at 18lbs boost. You would have a clear upgrade option by going to 16v, if you felt you wanted more in the future. Have you've ditched the air con?

Penguinracer

Air con long gone.
If there's one thing I've learnt from my V12 Bi-turbo Mercs - that's the importance of torque & a highly tuned 8 valve will have a very flat torque curve - the challenge is to extend that torque into a higher rpm range to also generate good power - whereas the 16 valve has the opposite issue - weaker bottom - mid-range torque owing to lower gas velocities but better breathing up top resulting in high end power.
Chris White has basically said that the 16 valve wakes up 1000 rpm later but then carries that advantage 1000 rpm further.

I've done what I can to maximise VE with the intake, intercooling, throttle body, turbo back pressure, fuelling, camshaft & exhaust restriction. These four bangers are not natural rev-monsters. They have a heavy crank, rods & pistons - rpm is not really their friend. Obviously a higher VE will result in more power at any given boost level - as you're flowing a greater air mass. There's not much left in it if I want this thing to be reliable & durable.

I know that in a straight line my Merc Coupes will blow straight past this 952 with four people & their holiday luggage onboard in air-conditioned comfort & Claus Ankjaer (the founder of Kleemann) tells me it won't let up until somewhere out the other side of 200 mph...but not withstanding the brilliant ABC suspension...with all that mass...they ain't no track car!

blade7

A little surprised you didn't keep the air con for those long euro trips. Where are you planning do some miles in the the car, to check everything is OK?

Penguinracer

Despite what some have advertised, keeping aircon & power steering with a dry-sump system is a headache with these cars & besides the weight saving - with the bigger radiator, oil cooler, intercooler etc - there really just isn't room anymore.
This is no longer a purely touring machine & the other cars will always be better suited to that role - so having the window cracked open is a small price to pay.

The electric a/c units available for the 911 are interesting though:
https://www.classicretrofit.com/prod...c-911-full-kit

It would be great if these were adapted for the 951 / 952.