I'll pass on something I heard, don't know how true, but it was from a usually
reliable source; Since the advent of roller lifters, the oil companies have
been deleting the additive that keeps the cam from wearing out on the straight
lifter type of engine. The only oils that still have it are those intended for
diesel engines. There is a a designator (CD or something like that-I can find
out if anyone is interested) that indicates the additive is there. The oil is
available at truck stops - Shell has been recommended to me. Anyone know if
there is any truth to the story?
Bob
-------------- Original message ----------------------
From: David Brady <dmb993@earthlink.net>
> Us TR people are caught between a rock and a hard place.
> Having been thru an entire engine rebuild due to cam lobe
> disintegration, I decide to opt for lifter/lobe bedding over
> piston ring seating. I ran the car for 20 minutes at a steady
> 2000 rpm, and then I put her on the dyno and did my break
> in of the rings. Do the best you can. The rings will probably
> not seat 100%, but I'm happy with 80%, and the possibility
> of 100% over time IF the cam/lifters hold up their end of the
> bargain. The motor will run fine at 80% ring seat; the motor
> will not run fine if it's missing a cam lobe. Roller lifters on a
> modern engine are a whole different ball of wax.
>
>
> David Brady
> '68 TR250
> CD8124L
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