The Ford Barn - View Single Post - Wisdom of Stopping Engine by Choking It Out

40 Deluxe · 09-17-2020, 10:09 AM

Another point to ponder: In the days of carburetors it was common to find excessive cylinder wall wear at the top, to the extent that a ridge reamer was standard equipment in every mechanic's toolbox. This ridge was often in evidence before 100,000 miles. Now you will see the factory hone crosshatch clear to the top of the cylinders after 300,000 miles-no ridge! I think fuel injection has a lot to do with this. With a carburetor, a choke was needed for cold starts, resulting in a lot of raw gas (liquid fuel does not burn) washing down the cylinders, causing excess wear. With electronic injection, fuel is atomized at approx. 50 psi. The computer richens the mixture, but the air is not choked off so the cylinders are not washed down.

09-17-2020, 10:09 AM	#28
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: Wisdom of Stopping Engine by Choking It Out Another point to ponder: In the days of carburetors it was common to find excessive cylinder wall wear at the top, to the extent that a ridge reamer was standard equipment in every mechanic's toolbox. This ridge was often in evidence before 100,000 miles. Now you will see the factory hone crosshatch clear to the top of the cylinders after 300,000 miles-no ridge! I think fuel injection has a lot to do with this. With a carburetor, a choke was needed for cold starts, resulting in a lot of raw gas (liquid fuel does not burn) washing down the cylinders, causing excess wear. With electronic injection, fuel is atomized at approx. 50 psi. The computer richens the mixture, but the air is not choked off so the cylinders are not washed down.