RE: [Chrysler300] Can't Get Good Gas Anymore &300 shocks?

[christopher beilby <thelastbestgenius@xxxxxxxxxxx>]

1) Re engine failing after a rebuild, or due to poor gas - I am a long way away, so others closer, more knowledgeable, comment please if you think I off the mark?

What Tony below seems to have really struck trouble with is trying to run a high compression motor on a way too a low octane?! And to my knowledge, trying to retard the ignition to compensate, will just bring about the new problems he lists/found?!
The only cure I know for a high compression motor is correct octane gas/fuel?!? Retarding the spark will help for an octane rating a bit low, but if the octane rating 10 points too low - forget it!!? The motor will ping/detonate, run too hot out the exhaust - whatever.   In the 70s onwards, GM, everyone, dropped the comp ratio of their motors because that was the only way. Today it takes complex Computer management to run the comps we have in our old 300s?  Only cure/option we have is find near 100 octane gas, or lower our comps - and the latter is not attractive to me. Nor is the high octane which is currently around $8 a gal here, but still available for now from local pumps/stations.
if your motor pings, pings very bad on most normal throttle applications - fix it, or you will be up for big rebuild bills, new pistons etc, pretty soon?!
Tony mentions higher burning temps etc - but I think the most harmful is the detonation, which of course is caused by things in the combustion chamber getting too hot due to burning temps. Plugs for high comp motors have tips that are low, do not protrude as much as hotter range plugs, so they do not create hot spots - sometimes cylinder heads can be improved by looking for other bits, cast metal, that may cause hot points, can be ground sometimes to eliminate such projections/points. 
 
2) the 300 better shocks issue - I have both front and original rear 300C shocks off my 3 cars/300Cs - they are safe, but stored - I will get a few out, take some shots closed and extended, measure diameters etc, and forward them to the Club today or tomorrow when showery rain stops well enough to get out into the shed out back. Club then knows exact orig sizes etc - I will also compare resistance in both directions - just for a guide that may help figure what/how origs worked.,
 
Christopher in Australia
 



To: rpjasin@xxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
From: awrdoc@xxxxxxxxx
Date: Fri, 29 Jul 2011 13:54:17 -0700
Subject: Re: [Chrysler300] Can't Get Good Gas Anymore?


  



Hi Bob and all,

Thanks. 

It is the temperature of the exhaust manifolds and heads that is of primary concern and not the working cooling capacity of the radiator and cooling system. 

Those with exhaust manifold gasket replacement issues should be the first to think about these cooler plugs. 

My original fix was electronic ignition with a remote control where I found myself retarding the timing to deal with pre-ignition and poor gas especially on road trips where lower and lower octane was my only option. 

This previous fix caused multiple EM and VC gasket replacements. It also contributed to the early demise of a rebuilt engine after only 22,000 miles. Valve guides started to leak bypassing oil, 2 "black death" cylinders. EM and VC gasket replacements were always repetitive issue. 

The engine was rebuilt to the original 10.1:1 specs with no 99 octane gas to run in it. 

Another new fix was to water heat/cool the crossrams like the 300-F Gran and 300-H rather than have the super heated exhaust gas boil the ethanol containing gas. But that is the subject for another "College of Hark Knocks" treatise. 

Tony

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