Hello,

We have a lancia delta race car with a modified lancia thema 2.0 turbo engine.

I know found that the size of the inlet on the cylinder head is a lot bigger then the size on the manfold. If you calculate it to a round hole then the cylinderhead is 42.5 mm , the manifold 37.5 mm, and the other side of the first part of the manfold is also 42.5 mm, and furter part also.
This can't be good and must restrict for high HP.

The thema manfold is the same as on the alfa 155q4.

I'm curious about the lancia delta manifold, this manifold is only 1 piece, and hopefully the oval holes are the same size as the cylinder head. Does anyone know the size or has pictures of it with measures?