[Massive Type IV]

Oliver,
I explained the reasoning for the TI tins in an earlier post, it is due to the direction of the airflow.

Yes I did test this with full westach instrumentation, quad CHT and also one probe under each cylinders 3rd fin.

I also used the 24 probe harnass and installed 6 senders in different locations for each test, with 4 gauges I could watch each cylinder in real time... The differences were not small, and when the fan belt was removed from each one the engine magically produced 4more HP than with the TIV tins under the cylinders.

If VW would have wanted to restrict the airflow and keep things cooler don't you think they would have used TIII tins under the cylinders on TI powered busses? They did not because they understood the dynamics of the airflow.

For the cooling system to work efficiently the air must be able to escape almsot as fast as it goes over the cylinders, else it stagnates and does nothing...

I'm going to be testing my new version of DTM really soon, probably in 2 months . It is equipped with positioned stator vanesto direct airflow, at that time I wil also prove this cylinder tin debate again with my shroud, as I plan on offering the TI tins with the kit.

On a TI engine, the TIII tins did alot of harm, look on cal look com and do a search I posted the info there about 6 months ago,.