Pic of inside a 911-6 shroud

[Wally]

Originally Posted by Sandeep

Look at how the cylinder tins extend up into the airflow from the fan.

911 Cylinder tins ...

But what puzzles me most, is the 180 degree angled part of the under cylinder tins. The puzzling is that the original type 4 under cylinder tin has a similar design, but according to Jake, does not work well on a type 4. The type 1 straight undercylinder tin design seems to work best.

I certainly believe Jake that the type 1 style tin works best, but with my cylinders it doesn't fit at all, so I have removed the 180 degree ridges and cut off the under cylinderhead part, but it does still screw to the case and head in the original way. Hope it works...

I don't think that the upper part of the911 cylinder tins and how they extend into the airflow will work the same on a type 4 or that it matters a great deal, but I am curious as to why there is no extra guidance to the head part. The type 4 with 911 fan may need some help in that department (at least with nikasils).

Greetings,
Walter