If it was detonation related all the rod bearings would look about the same, right? Only 3 of the 8 showed any signs of advanced wear. All the others still looked great.
You can reasonably run a motor on 87 octane with 10 to 1 compression. The problem of detonation arises upon acceleration or loading of the motor. I have run my 400 only to 2000 rpm on 87 octane to move it 3 miles. Just don't work the motor.
Depends...You could have different tolerances in those rods. Not uncommon for assembly line or novice machining. Perhaps they were close or within a thousandth. Most of your rod bearing detonation issues surface on the upper bearing. Good oiling on specific rods could negate increased wear, poor oiling could result in 3 of 8 being accelerated.
My detonation problem, failure was on rods 1/2 and 3. The others were fine. Running 5800 rpm with 93 octane 130 mph and 10 to 1 compression. Electric fuel pump leaned out and failed causing the upper bearings on 1-3 to fail. I thought it was oil starvation until I realized my motor was not seized and the pump went out. I knew something was wrong when my oil PSI was 10 and my temps went up to 245 degrees.
Clevite has a poster..about 30 different bearings shown and causes. It is not an exact science, but determined based on experience of the builder/machinist and feedback of the customer.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
