Oil Mod info (2)
Posted by Dave Dodge - DRP on
February 29, 2000
In Reply to: Ron Dittmer
I'm certainly glad to see that at least 4 people have what they consider to
be good cams. May they live long and prosper. I will also say that for every
good set I hear about, there are 3 sets I sell because they went flat. I will
also say that there have been many instances where the customer brings or sends
his cams to me for inspection saying they are good, only to find that the
profile is worn down, and is noticable because of the ridge worn on the edge of
This means that the majority of home mechanics do not even know how to
determine if a cam is good or not. Pitting is only a visual defect, it's the
non-visual wear that people cannot detect.
I have sent oil system info to any
body that requested one, and there is NO ONE that knows more about these engines
than myself. I am an engineer, I design and test the parts I sell, I race the
parts I sell, and I have full access to metalurgy gurus that I consult with.
You will also be interested in the fact that Honda increased the
surface hardness on production cams beginning in 1983, and this is the year that
pitting started, rather than a melt down as was the failures in '82. The reason
is because they use a localized heat treating method that produces a hard
surface on a soft base.
As the cam wears you work your way through the hard part
of the cam lobe and into the softer material. I have tested every hardness
revision and found that improving the oil volume and pressure to the heads
allows all cams to last without pitting or cam wear (soft or hard). The oil mod
is the easiest and most effective way to prevent cam damage, along with proper
valve adjustment procedures.
I also offer hardfaced replacement cams that have
improved base metal consistency through a process called nitriding.
been doing this stuff for over 28 years, and V-4's since 1982. Let me know what
you guys do for a living and where your BBS is located so I can be a newby and
question all your years of experience :-)