This winter Steffen Madsen will build a new engine for my Alfa Romeo Giulietta SV racer/road car. The goal is an engine that will allow me to go motor racing with FIA HTP papers all over Europe, while still being able to run the car every day of summer on the roads - also going abroad. The car should retain a reasonable comfort level - enough to make it possible to drive through Europe without loosing my mind. If you get it - I love it!
The conrods are original Alfa Romeo 1300 items from the engine we use as a basis for the rebuild. I have it from Severin Skallerup who now drives a Chevrolet Corvette in hillclimbs, but used to drive a Giulia 1300 GT. I got this engine from him a few years back when he retrofitted the car with a 1600cc engine. Steffen was adamant that the new engine had been running recently and that we knew it could take the punishment. So despite actually getting my hands on a race spec 10106 engine, we decided to go with Severin's motor - because nobody knew why the Giulietta Veloce engine had been taken out of use, and why it had never been restored.
The main change was to move the wrist pin downwards by 1 mm, in order to get the correct compression ratio. After thorough investigation and correspondence with people we trust, we were convinced that stock Alfa Romeo conrods are of extremely good quality. This is why we use them for this high-revving engine.
All throws have been ground the first oversize, and accordingly we have purchased oversize bearings. The 1300cc engine doesn't have much torque - and the small capacity Alfa engines don't have nitrided surfaces anyway (more about that when we look at the crank). The bearing have been paired with each throw for equal bearing play.
The big-end bolts are also stock. We did consider ARP bolts, but they are no better than stock Alfa items. We also considered using 2-liter bolts, and modifying them for the slightly different 1300cc conrod and caps, but decided to re-use the original bolts.