no hoper
It would appear that basic facts about what causes higher than normal operating temps are being massaged to suit particular view
The following are some causes
1. Ignition timing advanced
2. Lean mixture during sustained running
3. Cam timing dialed incorrectly
4. Hole in intake manifold - lean mixture
5. Engine baffling broken/US
Which operating temps are you referring too?
The most important is CHT.
1. Will cause LOWER EGT and higher CHT.
2. Lean Mixture will result in lower CHT. A Rich mixture that is not rich enough causes higher CHT. (refer the graph a few pages back.
3. Where did we get that one from? Might be lucky to run at all
4. Intake leaks will cause higher CHT when operating ROP, this is again a RICH mixture but not rich enough. Those without an EMS or able to understand it will fly like this for hundreds of hours and never know. A LOP pilot will find it straight away and wonder why his plane runs rough when normally it is smooth. So to say a lean mixture with an induction leak will cause high CHT's is FALSE as it will run VERY cool indeed, if it is truly a lean mixture.
5. "Baffling baffles" if any of you have had recent AOPA Australian Pilot or SAAA Airsport magazines you would have seen an article of Baffles by two fellows, David Brown and Walter Atkinson. A good read indeed
Cheers.