RE: {Chrysler 300} Knocking

["Dan Plotkin" <dplotkin@xxxxxxxxxxxxxxxxxxx>]

It is important to know if you have detonation or pre-ignition going on. They sound similar, have separate causes but cause similar running problems and if severe enough engine damage. A carboned up engine with hot glowing debris or improper spark plug choice can cause detonation. Wrong timing and insufficient octane cause pre-ignition. Both are the "light-off" of cylinder contents before the proper moment. Both put tremendous stress on pistons and connecting rods as well as rob power from the engine. 

I'll assume  your 300 is for occasional use and recommend the following: Set base timing with a timing light to specification. Add 3 gallons 102 or above race gas (available at many Sunoco stations) and fill the rest with high octane pump gas. Then bump the timing ahead in small increments as far as you can without any pinging. This will have your motor producing optimum power. Driving around with retarded timing to be safe is no fun. This will marry you a cocktail of race gas, but the car will run great, and the smell of race gas is to me as sweet as baking cookies. 

If you want to skip the gas, as others mentioned set the timing as ahead as you can with no pinging. 

Danny Plotkin

-----Original Message-----
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of RICHARD HUSS
Sent: Sunday, January 2, 2022 8:33 PM
To: mgoodknight@xxxxxxxx
Cc: ryan_hillc300@xxxxxxxxxxx; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} Knocking

Thanks I think I have a lot to play with. 
> On Jan 2, 2022, at 8:20 PM, mgoodknight@xxxxxxxx wrote:
> 
> outside air temperature, altitude (elevation), engine operating temperature, fuel octane, air/fuel ratio, engine condition, carbon build up, spark plug heat range-----all are variables that affect knock  (detonation)   The factory listed spec for spark timing is only a guideline which works well for much of your driving conditions, but is only rarely an optimum setting  Just verify that you don't havea malfunction causing an upset in one of the things I've listed and then retard your spark in small increments until the knock is barely detectable.  It's ok to have a very slight knock under hard acceleration  (slightly noticeable knock is the operative phrase).
> 
> --------------Marshall Goodknight
> 
> ---------- Original Message ----------
> From: RICHARD HUSS <rhuss214192@xxxxxxxxxxx>
> To: Ryan Hill <ryan_hillc300@xxxxxxxxxxx>
> Cc: 'Keith Langendorfer' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
> Subject: Re: {Chrysler 300} Knocking
> Date: Sun, 2 Jan 2022 17:30:38 -0500
> 
> I did not set the timing. Probably need to see if it is correct. 
> 
>> On Jan 2, 2022, at 5:24 PM, Ryan Hill <ryan_hillc300@xxxxxxxxxxx> wrote:
>> 
>> Retard the timing to start, see if the knock goes away. 
>> 
>> Ryan Hill
>> 
>>> On Jan 2, 2022, at 2:07 PM, RICHARD HUSS <rhuss214192@xxxxxxxxxxx> wrote:
>>> 
>>> I am putting the 300G through some road testing and under hard acceleration I am  getting knocking. I would think it might be Air fuel mixture or low octane gas. I am running 90 octane. Any thoughts. Valves? Timing? Do I need to add lead?  
>>> 
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