happa

Im helping my dad restore a 63 Fulie and a 62. We are rebuilding both motors and one has a 097 cam and a the other has a 30/30 cam. I had heard about the new oils do not have zinc in them.? My question is for these both solid lifter cams do I need an additive to support there need? Ive heard I do and dont, so I need your knowledge! Thanks everyone!

66427-450

I’d recommend a search the active forum, and the archives......you'll find a ton of info on this topic.

But odds are, you'll end up with a CI-4 oil, or it's successor, CJ-4....... the older CI-4 is a little richer in wear additives (however the current spec CJ-4 is more than adequate for your application).

I went with Rotella 15-40.

Also, if you’re rebuilding, I’d recommend the Isky solids with the small hole in the face (supplies oil right where you need it, at the lobe/lifter contact point).

happa

Thank You! I'll do some searching.

KyleDallas

Oil discussions have been heavy in C1/C2.... the changing oil formulas
and their effects have weighed upon the minds of many of the
solid lifter owners here.

One avenue I've been exploring lately is using AeroShell Aviation oil.
Unfortunately I don't have the Zinc levels of AeroShell yet... but
I have been able to find several at length discussions on the
difficulty having the formula for Std. Piston driven Aircraft changed.... the
major difficulty in getting a new formula for Std. Engine Aviation Oil is
the Military... they won't come off their "Mil Spec" .... evidently
the Armed Forces use enough of Std. Av Oil to squash any suggestion
of change.... and the Oil Companies are keeping MilSpec and Civi Spec
the same.

This is GOOD if AeroShell has enough Zinc... it would mean a good,
long lasting source of oil suitable for flat tappet solid lifter motors
has been found....

Another plus for Aeroshell is that it is cheap..... less than a
quart of Automotive Synthetic last time I checked....
Lycoming Aviation engines are fairly VW-esque in their design... so
I think it's certainly probable that the Zinc content of AeroShell will
be amiable with solid lifter Corvette engines.

If someone here already has the zinc specs of AeroShell I'd love to
see them posted here.

Dick Whittington

Mil Spec what?? I have some older volumes of Lubication and they have the mil spec's in them.

Scott Marzahl

It meets MIL-L-22851D which has been superseded by SAE J-1899 which covers Ashless (detergent) aviaton oil.

Just use 15W-40 "I" or "J" or one of the "high mileage" motor oils that have plenty of zinc in them.

Aeroshell Plus is Aeroshell oil with the Lycoming LW-16702 oil additive. Lycoming '76 series engines (engines such as the O-320H2AD) require LW-16702 per an Airworthiness Directive (AD) to prevent camshaft lobe galling. By offering the additive as part of the oil it simplifies AD compliance and assures that the oil receives the additive.

LW-16702 is classified as an "EP" (extreme pressure) that is a surface reactant that chemically combines with Fe forming phosphides or phosphates. This protective film is a few molecules deep, that is swept away by shearing friction, and renewed thereafter. Thus LW-16702 is, in a sense, actually corroding the metal surfaces, however slowly.

Here is the MSDS for 16702, as stated above it is a mixture of Phosphates, no zinc.

http://lib.store.yahoo.net/lib/style...16702-MSDS.Pdf

Because the reacted metal surface has low shear strength, the sliding friction is markedly reduced, and the tendency to severe adhesion is reduced or even eliminated.

The combination of a higher surface energy of the freshly worn surfaces, local high temperatures, possible catalytic effects and any other activation processes makes the action of LW-16702 specific, taking place preferentially at the wear points (surface irregularities) where it is most needed.