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Originally Posted by Sandeep
... as the airflow may be having a hard time getting past the first fin on the head towards the case. It is much taller than the last cylinder fin towoards the head and perhaps this is an airflow barrier.
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Yeah, my thoughts also and with the scarsely finned (at the top anyway) 964 nikasils, that may be even more true.
The shroud should be a bit higher at the heads therefore imho, at least at the front cylinders (2 and 4) to have room for better air guidance and to direct the airfow 90 degrees there, so the air comes from the top down eventually...
My cylinder plates may work with nikasil cylinders, but you might get in trouble with steel cylinders because of the blocking of air flow essentially, so be carefull!
When you block off the cylinder air too much, you should see an increased oil temp very soon,...I think.
Take care,
Walter
BTW I have decided to have the heads 'done' after all and even increase cylinder capacity quite a bit (its never enough) while we're at it, so my testing has halted momentarily..