Spark knock
#1
Spark knock
Hi all,
I知 having some trouble with spark knock in my 68 442 (stock rocket 400 engine). I知 running premium fuel, but it still knocks under acceleration. Any suggestions on what could be the culprit? I was thinking of going to a PerTronix ignition system to see if that helps. Thanks for the input.
I知 having some trouble with spark knock in my 68 442 (stock rocket 400 engine). I知 running premium fuel, but it still knocks under acceleration. Any suggestions on what could be the culprit? I was thinking of going to a PerTronix ignition system to see if that helps. Thanks for the input.
#2
#3
Hi all,
I知 having some trouble with spark knock in my 68 442 (stock rocket 400 engine). I知 running premium fuel, but it still knocks under acceleration. Any suggestions on what could be the culprit? I was thinking of going to a PerTronix ignition system to see if that helps. Thanks for the input.
I知 having some trouble with spark knock in my 68 442 (stock rocket 400 engine). I知 running premium fuel, but it still knocks under acceleration. Any suggestions on what could be the culprit? I was thinking of going to a PerTronix ignition system to see if that helps. Thanks for the input.
#5
This is what I run in a similar car, same engine, W30 like cam, HEI distributor, auto trans, 2700 stall, 11:1 comp, sea level.
12-14* base timing, another 8-10* on the advance can the rest all in at 2800 for a total of 38ish. Then adjust the vacuum signal to achieve the highest reading possible at op. temp at 700-750 curb idle no vacuum leaks. I run 91 or better non-ethanol with 104 boost occasionally. Never knocks.
What plugs are you running?
12-14* base timing, another 8-10* on the advance can the rest all in at 2800 for a total of 38ish. Then adjust the vacuum signal to achieve the highest reading possible at op. temp at 700-750 curb idle no vacuum leaks. I run 91 or better non-ethanol with 104 boost occasionally. Never knocks.
What plugs are you running?
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