I think you meant a Lycoming IO-540?  Yes, and that one will detonate
easier than the above example.  Same scenario.  Actually it's one of
the most detonation-prone engines in the fleet, the TIO-540J2BD
Lycoming gets that award (Navajo Chieftan engine).  Running one without
an intercooler can routinely result in light detonation on takeoff at
the FFs recommended by Lycoming.  If run according to the POH,
essentially the detonation margin is so narrow as to be essentially
none.  We have REAMS of data on that engine and use it as an example in
the class.  We run one and demonstrate detonation on it--in real
time--every 60 days to a class of 40-60 students.  It's not like I
haven't watched this in real time on a running engine at least a couple
of dozen times.  Anyone who's been to the APS class has seen this.

Walter,

 

You are right, his engine is the 540.  This engine is in an E-Racer with an unwaste-gated supercharger, no intercooler, fixed pitch prop, electronic ignition, electronic fuel injection with little or no pilot control over mixture and using augmenter tubes to help with engine cooling..  The parts do not talk to one-another.  Takeoff is accomplished at reduced power.  He has seen in excess of 40" MAP.  He has de-constructed one or more pistons in the prior engine - detonation was the culprit.  His new engine has something like 7:1 pistons.  Nobody can convince him to at least normalize the blower.  Oh well..........

 

<<<<<<<

Both are on order.  I guess I will switch from reading novels to novel reading.  Thanks.

 

Scott