Jay wrote,
>I agree with Jarrid. However, I wonder how likely it is for that part
of
>the cam to really wear down significantly. The fuel pump lever does
not
>have too much force, does it? That being said, I had a brand new
SNIP...
A properly functioning pump only puts force on the eccentric when
fuel is being consumed. This is because the eccentric pulls
fuel into the pump, and leaves it under the pressure of the diaphragm
return sprint. This means that the more fuel that is used, the more
wear on both the pump and the eccentric.
Since there is a general correlation between fuel used and
milage, one could deduce that high milage engines would be
most likely to have the most wear. Not because of the milage
itself, but because of the fuel consumed to traverse those miles.
I reground a cam last year that had very deep scoring on the
eccentric, and the cam grinder welded it up.
I didnt ask for it, but they did do the job, and it didnt cost more.
The engine that the cam came from had over 150,000 miles
on it and several ring jobs. The cam didnt go flat, but
the laminated pump lever seems to be more agressive
on the eccentric than the lifters are, even though the lifters
put an order of magnetude more force on the cam lobes.
This, and also because there is no direct lubrication for
the pump lever.
Jarrid
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:02:24 CDT