Re: Hard vs. soft engine blocks

Posted by acolds On 2013/4/15 22:17:33

This may explain the use of soft rather than hard cast iron in Packard blocks. All Companies make parts to drawing which include a bill of material which may include sizes material to be made from sometimes referred to as material spec a normal standard for material SAE. The page I have included is from a SAE handbook. SAE has been around since the early 1900 started by automotive engineers for standards and to share information. States higher strength is gained by reducing carbon at the loss of some damping capacity. Could be Packard wanted the damping effect to add to silence of running engine.
Not knowing what the engineers specified but sure they knew why and what they were using and Quality Control made sure they got what they specified

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