MONTY THE ANSWER
100LL vs 80 OCTANE...
From: Don Cumpston <email@example.com>
My swift has a C145 in it that at overhaul had 6 new superior cylinder
asy's installed. We only have 100LL at AXQ. Should I use TCP in the fuel?
When I am at other airports that have 80 octane available should I use
the 80 or 100 ? Don Cumpston <firstname.lastname@example.org>
Use TCP whenever you use 100LL. The 7 to 1 compression ratio of the O-300
will not scavenge all the lead. Buy 80 whenever possible.
MORE ON DISCUSSION RE:
TCP WITH 100LL IN 80 OCT ENGINES... (12299)
The following discussion regarding TCP is from the Yahoo! Globe Temco
Swift Club message board...
When everybody was fueling
up for the trip home from Westover this year I saw a couple guys put in
TCP with the 100LL. What was interesting about it was that they had Cont.
210's. Why would you need TCP in an engine designed to run on 100LL? Keith
The short answer is: It can't hurt! TCP scavenges lead out with the normal
combustion. Even using TCP with 80/87 keeps the engine cleaner, especially
when an occasional load of 100LL is used. -- Jim
Swifter Steve Roth <email@example.com> adds...
Right Monty, even Alcor TCP supports your statement. Alcor has the measuring
syringe graduated for 80 Octane proportions. TCP makes a difference. I
have seen it with my own eyes. For a long time while I was in Tampa (TPF),
the airport had two separate compartments in the fuel truck -- 100LL and
100LL with TCP. I was driving a 1959 C-172 with O-300A. I got the TCP
version all of the time. I know what my plugs looked like. Then, they
quite putting TCP directly into the fuel trucks; I was lazy and did not
use TCP on my own. My plugs started getting "rocks" of lead deposits inside
the plugs. Made a difference. I tried to tie the use of TCP to my problem
of valve sticking in that O-300A but it seems there is a "God of Valve
Sticks" and only he decides when a valve will stick. Using TCP can't hurt,
for sure. That's a whole nuther subject, though, fraught with voodoo.
THE DARK SIDE OF TCP...
The following was posted by Swifter Steve Wilson on the Yahoo! Globe Temco
Swift Club message board. Most of you know Steve's credentials but for
those of you who don't, Steve's day job is with a group you might just
be familiar with that has the initials NTSB...
Tricresyl Phosphate (TCP)
works like Monty and Steve say, but a word of caution. You should be aware
that the substance is noxious and is transdermal with serious complications
for your innards. This means that you don't want to get it on your skin,
eyes, etc., at any cost. Fumes are a serious health risk also. Not to
mention that the stuff has the potential to be extremely explosive under
certain conditions. Sooooo, what worries me is carrying it in an airplane.
In fact, if you read the label Alcor warns against carrying it aboard
the airplane. Actually, that recommendation came about due to a can exploding
inside a C-172 with two fatalities. Using it in your hangar, with latex
gloves, maybe a respirator, and good ventilation, it works as advertised,
but the potential hazards must not be ignored.
I use Marvel Mystery Oil
(MMO)in my Avgas. It is NOT FAA approved and it has NO scavenging properties,
but adds a little upper cylinder lube which works well against the ravages
of 100LL in the low compression engines designed for 80/87. As for the
safety aspects of MMO, you could probably take a bath in it (that's a
joke...not recommended, but at least you would smell like wintergreen).
While carrying it in the airplane it presents no more hazard than an extra
can of oil. -- Steve
USE THE RIGHT GLOVE FOR
THE JOB... (050100)
From: Ron Natalie <firstname.lastname@example.org>
Just looking through your article on OCTANE. I should point out that there
is some dangerous information in your part marked "Dark side of TCP."
Latex gloves are entirely inappropriate for TCP, it will go right through
them. Nitrile gloves are what is recommended.
MONTY LIKES TCP...
From: Alan Dicker <email@example.com>
Hi Jim, Do you recommend TCP for a C145 engine? I haven't been using it
in 80733 but wonder if I should. What about for a O300? Thanks. Alan
Oh definitely! Every small Continental, from A-65 thru C-145 should have
TCP added to the fuel when using 100LL. I even use few ounces every other
tankful or so when using 80. O-300 is the same thing. I don't think TCP
hurts anything even on the "big" engines designed for 100 octane. --
THE "CARE AND FEEDING"
OF TCP... (050200)
From: Richard Aaron <firstname.lastname@example.org>
Subject: Re: TCP
I just read the comments on TCP from Ron Natalie. I've always found it
difficult stuff to handle without dripping or spilling, even with the
plastic syringe that you can get for it. The syringe eventually deteriorates
too. The latest scheme that I've tried, which seems to be working out
well, is to use an old fashioned metal oil can (straight spout, no pump)
filled with the TCP and a small graduated plastic beaker. I'm using a
nail in the tip of the spout as a closure but am looking for a suitable
plastic cover. Once the TCP is in the can, it can be dispensed quite neatly.
Regards, Dick Aaron N2405B
TCP (FAA APPROVED) AND
MARVEL "MYSTERY" OIL (FAA NOT APPROVED)... (050400)
Subj: Re: N77759
From: Jerry Swartz <JSw7211963>
Jim: Prior to the new TCM cylinders installation, I had been running
Marvel in the gas. What is your feeling on the continuation of using it?
Is there some other additive that would be better?? Jerry S.
It won't hurt anything. TCP scavenges lead deposits out of the cylinder.
Marvel seems to add to the top oiling of the cylinder as well. TCP is
FAA approved, Marvel just seems to work, although its benefits are largely
anecdotal. Marvel has been around since the '20's. I had an FAA inspector
ask me once, "Tell me, man to man, do you use Marvel Mystery Oil?" He
replied in the affirmative. He said, "Yeah, me too, I wouldn't run an
O-300 without it. Any big aircraft supply place has TCP. Aircraft Spruce
has it for around $44/gal + shipping. I looked in TAP on Pg.11 and Aircraft
Supply has it for $44.80/gal. Many FBO's have it also. -- Jim