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914-6 GT | profile | all galleries >> Other Racing Parts >> 904 / Spyder >> Spyder Four-Cam 2 Liter Engine tree view | thumbnails | slideshow

Spyder Four-Cam 2 Liter Engine

Seller's Description: Asking $150,000 (Mar/2012)

About ten years ago I wanted to build the ultimate four cam Porsche motor to put in my RS60 Spyder that had run a 2 liter motor back in the day. I contracted with a very well known ex-Formula 1 race engineer and mechanic to start with a block and go as far as he could go. There’s an old adage that the amount of horsepower possible out of a motor is directly related to amount of money one spends on it. Before this motor, the most powerful 2 liter four cam motor made 180 HP…my goal was 210 HP!

With this goal in mind, I purchased a new unnumbered 2 liter block, heads, crank along with other parts. This engine setup preceded the factory's 904 engine, as Porsche had first raced several RS60 spiders with 2 liter motors. After weighing my options, I decided to build an all new engine utilizing modern technology including a cross bolted block like those found in the 904.

When completed, the cost of the motor ran over $235,000 and the engineer promised 200 HP with tons of torque. One of the main goals was to lighten the internals of the new motor. With that in mind, I installed titanium parts from the best manufactures in Europe wherever possible along with Pankl rods and valves with beryllium seats, custom Mahle pistons with short light weight skirts and smaller pins, knife-edged crank and of course new gears and heavy duty oil pump.

New intake manifolds were created to work with 48 DOCE Weber carburetors, and the heads were polished/ported and flowed for maximum air/fuel efficiency. We had a cam specialist design specific cams of the same original material with new followers, drag levers and machined a part that would allow perfect timing of the valve train. Per the best advice of four cam specialist, all cam weights were removed as had been done on most four cam engines over the years.

Since the engine was not finished after five years, I removed the parts from the original engineer and sent them to Paul Willison to be assembled and checked. He feels the motor is a work of art. I asked him to run the motor on the dyno but not to develop the performance, as the engine has no value to me since I’ve sold my Spyder and I didn’t want to spend more money on it. When new engines are installed on a dyno they require major adjustments in jetting, timing and exhaust to tune for maximum performance and this motor made 169 HP and 150 Ft. Lbs. of torque with no performance tuning at all! Paul found the engine ran well and thought it would be great in my old spyder. You are welcome to talk to him about his findings.

Please feel free to ask any questions.
904 / Spyder Two Liter Four Cam Engine - eBay Auction
904 / Spyder Two Liter Four Cam Engine - eBay Auction
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