millenium cylinders and 80 octane

[R. Wubben]

I am curious about a situation I haven't encountered before.

I just bought a '62 Cessna 172 with 70 hours on an overhauled 0-300
engine. New millenium cylinders were installed.

Can I, or should I, run on 80 octane or 100LL?

The airport that I'm moving to has 80 octane available (a rarity in
this day and age).

My previous airplane was a '59 Forney F-1 (Ercoupe) with a C-90 and
regular cylinders and I had two stuck exhaust valves in 2 years
despite aggresive leaning while running on 100LL (but not putting in
any Marvel Mystery Oil or AvBlend).

So, 80 or 100?
MMO or AvBlend or nothing? (does one need to mess with these if you
are running on 80?).

Thanks,
Ryan Wubben

[Dave Stadt]

"R. Wubben" > wrote in message
om...
> I am curious about a situation I haven't encountered before.
>
> I just bought a '62 Cessna 172 with 70 hours on an overhauled 0-300
> engine. New millenium cylinders were installed.
>
> Can I, or should I, run on 80 octane or 100LL?
>
> The airport that I'm moving to has 80 octane available (a rarity in
> this day and age).
>
> My previous airplane was a '59 Forney F-1 (Ercoupe) with a C-90 and
> regular cylinders and I had two stuck exhaust valves in 2 years
> despite aggresive leaning while running on 100LL (but not putting in
> any Marvel Mystery Oil or AvBlend).
>
> So, 80 or 100?
> MMO or AvBlend or nothing? (does one need to mess with these if you
> are running on 80?).
>
> Thanks,
> Ryan Wubben

100LL is horrible for your engine. It was made for 80 and I can't
understand why you would not use it if it is available.

[G.R. Patterson III]

"R. Wubben" wrote:
>
> Can I, or should I, run on 80 octane or 100LL?

80.

George Patterson
Battle, n; A method of untying with the teeth a political knot that would
not yield to the tongue.

[tony roberts]

> So, 80 or 100?
> MMO or AvBlend or nothing? (does one need to mess with these if you
> are running on 80?).

Run 80 and don't add anything.

tony


--

Tony Roberts
PP-ASEL
VFR OTT
Night
Almost Instrument :)
Cessna 172H C-GICE

[Ben Smith]

Ryan - Did you ever make it here to Wisconsin? Which airport are you going
to that has 80 octane?

--
Ben
C-172 - N13258 @ 87Y

[mikem]

The only thing better for your engine than 80 is unleaded mogas.
100 is poison.

R. Wubben wrote:

> I am curious about a situation I haven't encountered before.
>
> I just bought a '62 Cessna 172 with 70 hours on an overhauled 0-300
> engine. New millenium cylinders were installed.
>
> Can I, or should I, run on 80 octane or 100LL?
>
> The airport that I'm moving to has 80 octane available (a rarity in
> this day and age).
>
> My previous airplane was a '59 Forney F-1 (Ercoupe) with a C-90 and
> regular cylinders and I had two stuck exhaust valves in 2 years
> despite aggresive leaning while running on 100LL (but not putting in
> any Marvel Mystery Oil or AvBlend).
>
> So, 80 or 100?
> MMO or AvBlend or nothing? (does one need to mess with these if you
> are running on 80?).
>
> Thanks,
> Ryan Wubben

[R. Wubben]

Ben,
Waunakee has 80, but it's availability I think is dependant on when
someone is there or having a key. Made it back to Wisconsin about 6-7
weeks ago (just in time for winter). Everyone in NC was questioning my
sanity, but they have had a pretty foul winter down there (relatively
speaking).

-Ryan

"Ben Smith" > wrote in message >...
> Ryan - Did you ever make it here to Wisconsin? Which airport are you going
> to that has 80 octane?

[R. Wubben]

It's a moot point. The tank I thought was full of 80 is actually full of 100LL.
Thanks for the info.
Back to square one.