[TR] TR6 cam - FLAT tappets (lifters)

[aribert neumann]

Bill:

No speculation on his part.  He asked if it was a regrind or new blank (was
new).  He did mention that the cam castings now have larger lobes that
yield a larger base circle with increased life expectancy.


On Wed, Jan 29, 2014 at 4:27 PM, Wbeech <wbeech at flash.net> wrote:

> Just curious, did Mr Goode have an explanation as to why his cam failed
> when you did everything right?  Any offer the re-grind it for you?
>
> Bill
>
> Sent from mobile Bill
>
> On Jan 29, 2014, at 3:19 PM, aribert neumann <aribertn at gmail.com> wrote:
>
> Greetings all:
>
> I need to replace the cam in my car - had a Goodparts GP2 and wiped a cam
> lobe after a mere 10K miles.  I did all the proper: cam break-in time &
> lube, high ZDDP oil, etc.  I like the cam grind, so after poking around the
> net, asking a few questions, etc, I decided to buy another.
>
> This time I will buy the replacement lifters from the same source as the
> cam.  When I went to order the lifters I see that Good's lifters are ground
> truly flat.  I have always heard that all "flat tappets" are slightly
> crowned.  I contacted Good and his response is that his cam is "... ground
> without a taper on the lobe and should be run with a perfectly flat
> tappet..." and that his lifters have been ground flat for the past year.
>
> I am a bit spooked with so little "in the field" development time on his
> flat tappets.  I don't want to be spending $500 every 10K miles to replace
> cams.
>
> I have always heard that flat tappets are really slightly crowned.  All
> tappets that I have ever  handled were crowned on the face - two tappet
> surfaces could not be wrung together.  Your thoughts?
>
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