Re: The Second Packard "Twin Six"
Posted by Owen_Dyneto On 2008/9/20 8:19:34
A picture is, as they say, worth a thousand words so perhaps the attached section of a PMCCo engineering drawing will help you visualize the combustion chamber/valve layout of the Packard Twelve of 1932-39. These blueprints are dated 1936 but other than the changes for 1935 in displacement and from babbit to insert bearings, the engine remained pretty much the same through its entire production run.
There are usually many reasons behind decisions. Some of the reasons for the introduction of the first V12 were prestige, a smoother and better powerplant, but certainly one consideration was that it was cheaper to manufacture than the prior "Dominant Eight" or "48". Likewise at the end of the early V12, the Single Eight was introduced, again in part because it was as smooth and powerful but also because it was cheaper to manufacture than the Twin Six. But the Twelve of 1932 became what it was primarily because of competitive pressures from the Cadillac V16/V12 pair.
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There are usually many reasons behind decisions. Some of the reasons for the introduction of the first V12 were prestige, a smoother and better powerplant, but certainly one consideration was that it was cheaper to manufacture than the prior "Dominant Eight" or "48". Likewise at the end of the early V12, the Single Eight was introduced, again in part because it was as smooth and powerful but also because it was cheaper to manufacture than the Twin Six. But the Twelve of 1932 became what it was primarily because of competitive pressures from the Cadillac V16/V12 pair.
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