Quote:
Originally Posted by steve25
Yes there are other factors to the game also.
For instance I have heard that Pontiac aged there cast iron pieces long before machining them, and here once again it would be nice to know if that where true.
Other things matter much also.
I have ground on many a Ford head to find such porosity that plans made to port them to a certain level of air flow had to lowered, and I have just found this condition in a AMC head I just ported.
So then to me with a condition like this, one has to wonder when, other then cylinder walls and lifter bores ware wise how much a good quality iron matters if there’s inclusions everywhere.
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I was told around 20 years ago or so. When much of the brake rotor production moved to China. That cast iron has to be aged outside for 3 months before machining. That it stabilizes during that time. We were experiencing major rotor warping issues back then.
I was also told at that same time that iron castings for a lathe or mill have to be aged for years. Otherwise the final machining tolerance of the surfaces will move and be inconsistent.