Re: Cam angle/Dwell

Posted by Janicholson on January 20, 2007 at 16:57:50 from (66.173.50.90):

In Reply to: 300u idle speed, tach parts.. buncha ?s posted by JayWalt on January 20, 2007 at 10:46:25:

No offense Teady52Food, A dwell reading is the amount of distributor rotation during which the points remain closed. Dwell depends on the specification for the point gap, the effect of ramp angle on the point opening, the lever angle/ratio of the points, and if it is a dual point system. Dwell specs are usually not transferable from one distributor type to another, and are usually specific to a type. Many specifications are similar. Variation in dwell from one cam lobe to the next is a look at the shaft/bushing wear, or play in the cam mounting method. I is measured with a distributor testor, (or a degree wheel on the engine and a timing light).
Many farmalls will Idle so slow that it is difficult to believe. Setting it to the 400 range is good policy. JimN

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