Paul,.   I am really taking a shine to this motor, another hour today and ran out of fuel. Have to await further deliveries.  1, Cooling. Changed back to water and Glycol from Evans after input from the group.  Todays OAT temp were cool at 28 degrees C or I think that is about  80 plus F.  The water would not go over 130 degrees with the cowl flaps shut!!   The oil was  153 degrees whereas with the evans the oil tracked the water nearly identically.  So it appears that the water/ Glycol is running 20 degrees cooler.  Whatever it is I now have a problem with being too cool!  The engine ran at 5600 rpm at 23 MP and 1720 EGT.  It is obvious that my prop is too big as max take off rpm was 6800 and the EGT went to 1850, which to me means that the engine is working too hard.  Prop is 70 “ dia by 90 degrees pitch.   What props are others running??  anyone ?  As I said the water was 130 degrees, the oil 153 degrees and oil pressure was 86 psi .  GS was a little slow at 120 ( should be 135), so all points to the prop.  Have to do a max speed in level flight before the prop is altered.  So to sum up, the cooling works too well thanks to a bloke about Paul’s size and his book on cooling. The motor runs very well especially considering the poor bloke who had a Lyc fail after take off at Perth a few days ago in a Glasair.  Not pretty at all.   So far the figures.

Neil.

Block off some of that huge rad intake scope :) That will make it faster.

I forgot what your gear ratio is? If it is 2.85:1  then yes the pitch may be too much.
If it is 2.17:1  6800 RPM is about right.

Measure the thickness of the prop tips from the end back about 2 inches and
tell me what it is. Who made the prop?

Dive the plane and see if the RPM increases. You cannot hurt a rotary.
If the RPM does not increase the prop tip drag is going transonic.
Thinner tips help.

Paul Lamar