Quote:
Originally Posted by NROTOXIN
From the Progression Ignitions product description:
"Distributor gear is melonized steel. Compatible with flat tappet cams and hydraulic roller cams."
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Hmm
Melonized steel is a salt bath Ferritic Nitrocarburize procedure which uses a cyanide base. The process is accomplished at temperature around 1050F. It is usually (but not in all cases) applied to low alloy steels to form a surface generally of iron nitrides.
I'm guessing it can be used as a substitute when a steel gear is specified?
Summit:
Melonized or Hardened Steel
Heat treated for durability.
Slick surface is compatible with any type of cam.
Often used by the OEM for long life.
Generally used as the default gear on replacement distributors.
Today, GM and Ford both use melonized gears in several of their street crate engines equipped with steel camshaft cores. Because of their wear properties, melonized gears are a good fit for cars with either ductile iron camshafts or cams manufactured from billet steel. Melonized gears are compatible with conventional iron core camshafts too.