[wbnapier]

With 100 octane, at WOT, I hear a crackling sound, which I assume is pinging. I don't know the details of my engine, other than block, heads, and mild build circa 1991.

Originally Posted by tom s

Your lucky you can get by with the 100,you have to be way over 11-1 if the block has been decked and any over bore.Tom

[PunchT37]

After 62 posts, either lower the idle speed, reduce cyl. pressure, reduce cyl. temp., all the above, or raise octane.

[shaker455]

Originally Posted by PunchT37

After 62 posts, either lower the idle speed, reduce cyl. pressure, reduce cyl. temp., all the above, or raise octane.

X2 Wade!

[STEELCITYFIREBIRD]

Originally Posted by PunchT37

After 62 posts, either lower the idle speed, reduce cyl. pressure, reduce cyl. temp., all the above, or raise octane.

X3....might I add tighten up the squish, might be easy as some thin head gaskets.

Attempting to be a fuel Alchemist can have disastrous results during the learning curve.

[dataway]

Originally Posted by wbnapier

With 100 octane, at WOT, I hear a crackling sound, which I assume is pinging. I don't know the details of my engine, other than block, heads, and mild build circa 1991.

A "lean miss" can sound like that sometimes. Once had a holley 450 cfm carb on my GTO ( when I was 17) ... at about 4000 rpm it would start crackling. Luckily I corrected the situation before I melted a piston.

[wbnapier]

Originally Posted by dataway

A "lean miss" can sound like that sometimes. Once had a holley 450 cfm carb on my GTO ( when I was 17) ... at about 4000 rpm it would start crackling. Luckily I corrected the situation before I melted a piston.

How did you correct it? I had a dyno test done and I was a little lean at WOT, so I increased the jetting. I redid the dyno thing and no change. Strange. Timing is 12 initial 32 total.