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sfhess

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Posts posted by sfhess

  1. 16 hours ago, Robberbaron said:

    As explained by Casey:

    I believe the tall deck versions were the 400, 425, and 455.  All other versions were the "standard" deck, including the smogger 403.

    Wasn't the "Pontiac" 403 actually an Olds engine?

  2. 33 minutes ago, espo said:

    When I mentioned Dieseling I was referring to what was also called "running on". What was happening was that the combustion chamber was so hot it would ignite any amount of fuel that may be in the combustion chamber, and this would keep the engine running in a sputtering fashion and the sound was often associated with that of a diesel engine and so that name as well. Yes, the ignition key could be removed, and this would trigger the condition in the engine where the ignition system no longer provided the spark too the spark plugs and the heat in the combustion chamber is what was causing the small amount of fuel present to ignite.  The excessive engine heat was created by the retarded spark advance dictated by the California Air Research Board, called CARB as their acremen. This was also a required retro fit on many '60's era cars and trucks even if they had the factory California Emissions systems from the factory. My '69 Camaro and '66 El Camino required that the vacuum advance from the carb. to the distributer be removed and caps installed on both. They also required that the ignition timing be retarded to 0 or less as opposed to the factory setting that was in the 10 degrees or more advanced. This is what caused the excessive heat buildup in the combustion chamber. While the state thought this helped reduce emissions it also caused premature engine wear and even failure. I hope this better explains what I was trying to express. 

    I know what you were trying to express.  I experienced it many times myself.

  3. 6 hours ago, espo said:

    A lot of that was caused by the California Smog laws. Their thinking was we didn't need a vacuum advance unit on our Distributers, and we should have the timing retarded to the point that the Combustion Chamber would remain hot enough to ignite any remaining fuel in the Combustion Chamber when the ignition was turn off. This was often referred to as "dieseling" because of the sound as the engine would sputter to a stop. The plus side was if you had a manual transmission, you could hold your foot on the brakes and release the clutch with the car in gear as this would stop the engine without any further damage to the internals of the engine.  

    GM ignition switches were designed so you could take the key out while the engine was running.  This feature had nothing to do with "dieseling".

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