Glen:
Not unusual to have this happen at all.
Not sure what boost you are running but
Aldon (UK) recommends no more than
24 degrees with an 8.3-1 static compression ratio (aluminum head) using
a max of 6psi on 93PON (96RON) on my
1293. Don't know whether this helps or not; hope so!
For what it is worth, I have never heard
detonation in any of my Series A engines,
including the one I burned holes in the
piston crowns running too much advance,
years ago. It never pinged, either! Spark
plugs looked OK too, as long as engine
never got over 5,500 which it hardly ever
did. But, it got there "enough over time,
obviously!!
Of course, it had a header and 2 inch
exhaust running a Cherry Bomb! Gee,
do'ya think this is why I didn't hear the
pinging or detonation (Duh!!)?
Live and learn!
Cap'n. Bob
'61 :{)
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