I presume in a head like the RJL head or the one illustrated by Micropuller, the squishband would be on the head insert going into the cylinder. Now if the contrapiston is up in the head or sticking out just a fraction, doesn't this change any effect the squishband might have? Of course in a situation where the contrapiston sits in the bore, the squishband could be put on the contrapiston.

It seems to me that one adjusts a diesel to run at a particular operating temperature. As the engine warms up you back the compression off as less compression heat is needed. In Micropuller's situation, where he needs maximum power for a few seconds, a head temperature measuring device, of which I think there are several available, might be very useful. It also strikes me that one would want to enter a high load situation a little undercompressed. All very interesting. I'd like to know more about Micropuller's competition event.

Jim