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CARRERA BROS - JZ Machtech

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at two weeks. The case was leak-free, so the decision<br />

was taken to leave it together, refurb the heads and<br />

assemble the new parts. Two weeks became six and, in<br />

hindsight, Shirish would rather have split the case and<br />

balanced the bottom end.<br />

Brand spanking new Mahle pistons and 98mm barrels<br />

were not the only bits little brother bought. A pair of<br />

Dougherty Racing DC20 cams were found, and a 3.2<br />

throttle body was bored out 3mm to increase the<br />

charge at wide-open throttle. A lightweight starter was<br />

added, as well as Club Sport mounts and an upgraded<br />

K3 alternator.<br />

The list goes on: Smart Racing valve springs, 993 head<br />

studs and rod bolts, refurbed injectors, new ICV and<br />

crank sensors, gearbox sensor, oil pressure switch and<br />

new seals everywhere. The transmission was given a lift<br />

with the G50 clutch fork mod, and new master and slave<br />

cylinders fitted. The clutch was replaced with a 930<br />

clutch disc, new release bearing and a Kennedy<br />

lightweight aluminium pressure plate.<br />

Mothy heat exchangers and cross-over pipe were<br />

replaced with standard Porsche items, flowing into a<br />

Scart pre-silencer and a DP Motorsport muffler. The<br />

engine fittings were replated, tinware was replaced and<br />

powder-coated, and new rear wheel bearings were the<br />

final ‘while-you’re-in-there’. Phew!<br />

As the car arrives at our meeting point, the sound is<br />

impressive; the engine exudes unadulterated authority<br />

through the chunky DP silencer. This muffler is heavy –<br />

Shirish reckons 12 kilos – but the noise is anthemic.<br />

So it should be: new ones cost circa €1200.<br />

The chorus of both cars on the move is intoxicating.<br />

The 3.2 has a lighter tone than its bigger brother; the<br />

sweet spot of that air-cooled thrum meets the ear drum<br />

lower down the rev range. The 3.4 is understandably<br />

louder through its bigger pipe, but volume is not the main<br />

ingredient. The DC20s lend a bass-heavy burble to the<br />

tune played at tick-over, which carries right through<br />

the revs: it’s race-car sound at sensible decibels. At<br />

wide-open throttle, it rocks the casbah.<br />

Shirish loves the noise it makes, but he has not really<br />

heard it yet. Just as an acoustic guitar is never properly<br />

heard by the guitarist (the sound exits away from your<br />

ears, set behind the sound hole), so the sound of a 911<br />

can only be appreciated when standing behind it. Now<br />

curious, he hands me the keys and I take off.<br />

Take off is the right expression; this is a rocket ship.<br />

I am expecting the bigger capacity to slow the revs<br />

down, but the reverse is true. Similar piston area with a<br />

slightly lighter rotating mass means the motor spins like<br />

78 911 & PORSCHE WORLD

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