National Aeronca Association Bulletin Board

1. Name – Larry Miller

2. Location State - Texas

3. Type of fuel (Auto/100LL/Mix) – 100LL Avgas

4. MMO (if used and quantity and frequency) - Never

5. Engine type / Time since TOH – Lycoming 0235 C1 625 hours SMOH

6. Years using this procedure – Always -

7. Do you check for alcohol in the fuel? If so, how? - No

8. Have you had any stuck valves? - No

Comments: I have never been convinced that the small savings with Auto gas is worth the risk. Contamination, alcohol plus the hassle involved. Our Avgas is about $3.75 per gallon. I think I save more fuel by flying at 65% power most of the time.

Sept. 1996 - May 2000
Nathan K. Hammond
Central Kentucky
75/25.... 93 oct Auto/100LL
4oz/10gal..........Not often, maybe every 5th-6th fill-up
A-65-8F...... 840 SMOH, unkown STOH
4 years
Yes, Fuel and water mixed in clear bottle.
Yes, Twice do to Carbon build up on valve stem and excessive oil temp, 210' or higher. Used Rope trick to pop valve, then ran 2 tanks of fuel with 8-10 oz of MMO. 2 years between occurances.***


May 2000 - Oct. 2004
Nathan K. Hammond
Central Kentucky
100LL
4oz/10gal..........Not often, maybe every 5th-6th fill-up
A-65-8F...... 1050 SMOH, unkown STOH
4 years
Yes, on the occation I used Auto Gas. Fuel and water mixed in clear bottle.
Yes, Once do to Carbon build up on valve stem and possible excessive oil temp, 210' or higher. Rope Trick unsuccsessful. Forced to pull valve and clean using abbraisive cloth, clean guide with "bore brush." Ran next 2 tanks with 8-10oz. MMO.***

*** Note, valve sticking happend on #4 exhaust everytime.***



Nov. 2005 - Present
Nathan K. Hammond
North Georgia
100LL
4oz/10gal..........2 out of 3 fill-ups
C-85/O-200...... 33 SMOH
6 Months
No, No auto gas used yet.
No



nkh


edit: fuel ratio (auto/av) bass-ackwards.
nkh

kevin mielke
c90-8 150 smoh
alaska
87 oct auto $2.90 per gal
no mmo
no test
no stuck valves
1 year with this plane

1. Neal Brandt

2. Monroe, NC

3. Auto and some 100LL

4. MMO 2oz to 5gals when auto gas used

5. A-65-6 / not sure but is in the process of a top now

6. Previous partner used 2 cycle oil and I now use 2oz MMO with 5 gals of auto fuel

7. Do you check for alcohol in the fuel? No If so, how? not sure how

8. two stuck valves as the reason for the top? If so what do you believe the cause was? lack of use of the airplane

Comments:

1. Don Eide

2. Webster, MN

3. 100LL always

4. Never

5. 0-235-C1 160 STOH

6. Eight years

7.Never

8.None

Comments: Stopped using auto fuel in the late 1980's when my
0-470 in my 182 quit cold with my family on board

1. Grady Kiehn

2. Texas

3. Mogas, No fuel on field.

4. No MMO

5. C90 / 5-600 hrs since TOH

6. 5+

7. Always check for alcohol. Mix water and gas in clear bottle.

8. One stuck valve several years prior to using Mogas.

Tony, my Champ, N83147, is under restoration. Can you use the info on another plane or are you Champ specific.

Dennis

Dennis, experience with fuel is what he is needing. Trying to work together a survey and please post what you can.

Thx,

Joe A

Bob Droege, Schenectady near ALbany, NY, use 100LL, only have had plane since 11/05, 100LL used by previous owner also, no reported stuck valves, what is MMO??, paying $4.41/gal here, 240 STOH, fly 4-5 hrs a month. A-65, don't check for alcohol.

1. Name: Dennis Clardy

2. Location State: Arkansas

3. Type of fuel (Auto/100LL/Mix): 1st 50 hrs on 100LL; last 810 hrs on auto

4. MMO (if used and quanity and frequency): No

5. Engine type / Time since TOH: 0-540B4B5/860hrs

6. Years using this procedure: approx. 20 yrs

7. Do you check for alcohol in the fuel? If so, how? : At the moment, no alcohol/gas in Arkansas. But if necessary will use water/gas in jar method.

8. Have you had any stuck valves? If so what do you believe the cause was? One stuck valve at about 500 hrs. Exhaust valve guide not properly reamed to size.


Comments: Use a lead additive

Bob,

MMO is Marvel Mystery Oil. Legally its not for use in airplanes but is said be a good upper cylinder lubricant, which should help keep the valves from sticking. That is one of the major reasons for this survey, to see if anyone has issues with the valves sticking while using automotive fuel.

So far its looking like the real issue with valves sticking is with aviation fuel, so this survey is a very good tool.

Joe

Phil Santerre
Alaska
Mostly 100LL, lately some Auto
No MMO, have used AvBlend regularly
O-290D2, 420 hours
6 years
Yes, water in jar method
No stuck valves

1. Name Ed Bingham

2. Location State WV

3. Type of fuel (Auto/100LL/Mix) 100ll

4. MMO (if used and quanity and frequency) no

5. Engine type / Time since TOH C65 250

6. Years using this procedure 2 yrs for me

7. Do you check for alcohol in the fuel? If so, how? no

8. Have you had any stuck valves? If so what do you believe the cause was? no

Comments: Engine runs great on 100ll. Now I've probably jinxed it and will have to start with MMO!

1. Richard Dorman

2.Washington state

3. auto fuel

5. O-470, A65, O-300 several thousand hours.

6. 20 years

7. Request to fuel supplier that no alcohol be in fuel. New law though
will allow refinery not to list additives in fuel. Sooooo......... !

1. High Time

2. N.Y.

3. Auto

4. Yes

5. A-65 (900 STOH), C-85 (1100 SMOH)

6. 27 years

7. Buy bulk, check at delivery

8. No