Around the world on a GS850G for a cause

[shirazdrum]

It was a million degrees outside so i'm leaving now for the test. Be back shortly.

[rustybronco]

Flyboy,

I didn't think there would be any bad effects from using 100LL, I just thought blending it with the B75 he is finding in Brazil, would make a nice down and dirty way of not having to re-jet His carbs.

thanks for the information on using engine oil as a top end lubricant. I never did find a definitive answer on that issue.

do you know how much, if any, ethanol is in 100LL?

[Eliseo Monteverde]

The leader in fuel is Petrobras in Brazil, they have 3 different types of gasoline, the best and most expensive is the so-called "Podium" with high content of octane, but engine must be or exceeds 10:1 compression relation.
The second option is the gasoline called "Aditivada", which contains special additives for the domestic market with 20 to 25% of alcohol. This is not a good option for our old engines.
The last option is the "Comun" without additives, but I have no references to it.

In Uruguay I always use the gasoline called "super", but some years ago reduced the lead and this has bad fame on old engines for burned valves, therefore I add an additive of STP every full tank.

[Flyboy]

Dale, as far as I am aware, there is no ethanol in avgas at all, one of the reasons there are only three refineries in the world that produce the stuff.
One of the reasons that it is frowned upon to use mogas in aircraft is because the quality control is not as stringent as with avgas, so batches and supplies vary, whereas with avgas it is produced to very tight specs.
Also remember that the components certified for aircraft are still produced out of the same material, including rubber, that they were certified with 30 or 40 years ago, and those rubber hoses and components would not stand up to ethonol.
With the demise of avgas on the very near horizon, the manufactures are looking for alternative fuels, and testing with ethonol fuels has only just begun a few years ago, but it is purely testing, not in the commercial stuff.

Short answer, no, avgas does not contain any ethanol.

Typical formula
Alkylate~ 70 %
Isopentane~ 15 %
Toluene~ 15 %

Additives
Lead
Dyes
Scavenger
Antioxidant

In Brazil, All automotive pump gas, by federal law, must have between 20 and 25% ethanol added, even the premium blends...

[tkent02]

I would go easy with the 100 Avgas, it burns hotter than car gas does. I used some 100LL that was free at the airport (overflow from Cessna tanks) when my first GS 550 was new, in about 1978. It ran great, but after about a half tank the spark plug's electrodes were melted down to little nubs, and the bike was misfiring very badly. This was with only a small percentage of 100LL in regular car gas. There were no other problems with carburetion or anything else, as the bike was nearly new, with new plugs and new gas the bike ran fine for another 100,000 miles.
If you can still find it, 80/87 should run better, I've used it in cars just fine, a lot of people do. I'm not sure about using it in the air cooled bike engines.

You should easily be able to jet for any reasonable amount of alcohol in car gas with a little trial and error.

[shirazdrum]

Well sorry guys to keep you waiting. I went shopping . My windshield broke to pieces in Patagonia and after mending it with barbwires and such it was time for a new one. I found a new and very nice windshield for 90 bucks and jumped on it. (the pictures will be here soon)

The carb modification apparently worked. the plugs are in much better shape and more white stuff. But that's only 5 miles of testing. the definitive answer will come tomorrow night when i run for another 500km to Uruguay.

The gas in Argentina has a very little alcohol content if at all, so i can't blame the lean looking plugs on that. Eliseo is right about the Petrobras (The Brazilian chain), they do add alcohol to everything.

The alcohol is not really my problem as the alcohol flash point is around 55 where the gasoline is at -45 (the lower the more combustible). alcohol BTU per gallon is about 76,000 where the gasoline is at 114,000. So alcohol burns cooler if it does leave white residue that makes it look like that the mixture is lean.

That's why i worked my ass off to get the carbs with good gas to carburate a right mixture while i can see it rather than trying the same thing with ethanol gas.

So far it looks good, we'll know for sure tomorrow.

Chris

[wanderer]

Chris, If you still have problems with the threading of the #3 plug, when you get access to a machine shop, have them put a helicoil in it. I have used this to cure the problem on a # of bikes over the years. John

[mighty13d]

Chris, you want LESS white. I believe the suggestion was to RAISE the needles to richen the mixture not lower them to lean it out more. It sounds like you lowered it.

[Skateguy50]

Oh I thought he was already running the alcohol gas, that is just to come in the future... great

Plug 3 is loose threading in but doesnt cross and tightens up near the end. I cleaned it out best I could while it was apart... if he keeps it during maintenance stuff like this and only pulls it when its time to swap plugs he should be fine. My point was to make him aware of the issue to avoid making it worse.

pictures speak better than posts, if he put shims in I dont see how he could have adjusted it anyway but richening it... right?

[Eliseo Monteverde]

Spark plug condition picture guide:

Spark plug condition picture guide:

http://hondaspree.net/wiki/index.php5?title=Spark_Plugs_and_Plug_Chops

[rustybronco]

if he put shims in I dont see how he could have adjusted it anyway but richening it... right?

Correct...using shims that were thinner than the plastic spacer(s).

We took out the plastic spacers and replaced them with some aluminum ones .5mm shorter.

Looks like it was done correctly.

[Nessism]

Lots of cooks in the kitchen so don't want to confuse things further but the following are all reasonable methods to increase the richness of the mixture...

- Shim the needles by replacing the plastic washer on top of the clip with a washer stack roughly 1/2 as tall as the plastic spacer as installed from stock

- Open the pilot screws to as much as 3.5 turns from lightly seated

- Oil the air filter again. With a K&N you can spray oil right over the top of dirt on the filter and it won't hurt anything

- Move up one size on the main jets

Adding more oil on the filter is the easiest since the needles have already been shimmed.

Good luck and keep going...

[LADRI]

Hi everybody, last news, while I was driving to work this morning, Chris call me on the phone for last minute instructions about the best route to the Uruguay border.
Im been with him last night after diner when I drop him in my mom´s house and we say good bye and wish him good luck, he is a great guy and we have a good time together.
Bye!

Adrian

[Eliseo Monteverde]

Hi everybody, last news, while I was driving to work this morning, Chris call me on the phone for last minute instructions about the best route to the Uruguay border.
Im been with him last night after diner when I drop him in my mom´s house and we say good bye and wish him good luck, he is a great guy and we have a good time together.
Bye!

Adrian

Hola, Soy Eliseo y estoy esperando la llegada de Chris a Montevideo, Ayer le sugerí que cruzara para Uruguay en el puente Fray Bentos . Tu tienes una idea de que ruta va a hacer?

[Skateguy50]

Thanks for all your help Adrian, nothing against Argentina but I bet he is very excited to move on with the journey and see another country.