Engine assembly 2.

The plan and the main non-standard components

There are hardly any "standard" Cooper S engines in the world. And that's not mainly because they were not built well by the factory, but rather due to the fact, that thees cars offer  LOT more fun if given that very little bit of "extra".

Soo ill we modify our engine? Definitely. When doing soo, one must be careful though. It is far too easy to make a dyno-day-only car, that will be awful to drive. Our goal was to "finish" the factory treatment and develop the car in a manner the factory should have done if only they had the components, and the extra money to be able to do it.

The non standard components are mainly on the picture. The cylinder head was slightly modified at a point, but was done not quite well. Now I reshaped the ports, and generally finished the factory design. I did not opened up the ports too much, rather I only reshaped them to get a more unrestricted airflow, but not to slow down the gasses. Std valve sizes were kept, but the seat were given a 3 angle grind to better the flow at partial lift situations.

To achieve some extra at mid and top range, a bit longer duration camshaft was used with a modern, more aggressive valve timing profile. To work with this camshaft, a special valve spring set will be used.

On the intake side, a Kn filter will be used to better the intake,and a freeflow, 3-2-1 long central branch manifold, with a medium bore RC40 exhaust system made of stainless steel will be on the exit side. This system gives a modest note, but quite nice on power, especially on mid range torque. Although the manifold looks quite nice, it will be covered in heat insulation to keep the heat at bay.

All thees nicely set up, will develop a healthy 85-90bhps. 

We also have some parts to better longevity and general reliability. We will use a superb cometic head gasket, and spec higrade cylinder head bolts and nuts to prevent gasket failure, which is quite not unheard of with big bore mini engines. Arp studs we use at the main and conrod bearings, new oil cooler and pipe will be there to protect the new engine from old debris left in the 40+ years old cooler.