[Link X]

I am having problems with the ethonal gas causing problems with the rubber parts in the fuel system of my Moto Guzzi, I replaced the fuel lines with the teflon lined fuel injection lines, but rubber gaskets in the petcocks are leaking after only 1 year. Is there an additive that I can use or what.....

 

[buckman50]

Try to find Viton gaskets/orings/etc....they tend to hold up a bit better to the shit gas we're dumping into tanks.

The "normal" rubber or bunna-n o-rings simply get eaten quickly by this gas mixture.

 

[dhallilama]

i'll get in here before this gets locked...
really, the ethanol isn't necessarily what's eating the rubber components. yes, ethanol is a bit hard on *some* rubber... but the other additives in modern gasoline are more so.

on a positive note: ever notice what the octane is of higher ethanol content gasolines? yeah... it's pretty high. E85 (85% ethanol) is 105 to 107 octane (depends what makes up the other 15%).
Ethanol is a cheap* octane booster

*insert whatever political rant you like here about subsidies, etc...

i'm building my 12.5:1 sporty motor to run on just E85 and a lot of ignition advance.
it'll f'ing haul ass.
i've also upped my jets ~35% and run E85 in my '67 11:1 xlh with a ton of advance. torque monster. (bitch to start, though )

 

[Dr. Benway]

i'll get in here before this gets locked...

Cotten fuel additive exposition in 3...2...

 

[Cotten]

Can't let the good Doctor down...

Here's Buna-N in P4gas (attached).

The problem is: straight ethanol doesn't do anything to Buna-N!

....Cotten

 

[Dr. Benway]

That looks swell!

 

[kickstarts]

Please...make...Ethanol...threads...go...away...

 

[Cotten]

Please...make...Ethanol...threads...go...away...

So kickstarts,

What do YOU run, and how far from home?

....Cotten

 

[kickstarts]

So kickstarts,

What do YOU run, and how far from home?

....Cotten

What do I run? Super, the cheapest I can find. How far from home? As far as I care to go.

Never had a problem with the quality of any gas in any bike as long as you don't let em sit with gas in the carb for an extended period of time. Got a few tanks of water but that's about it.

 

[xllance]

Marvel Mystery Oil.

 

[dhallilama]

i prefer to run mine on unicorn tears and shattered dreams...
but i usually have to settle for super unleaded.

 

[ckunsman89]

Can't let the good Doctor down...

Here's Buna-N in P4gas (attached).

The problem is: straight ethanol doesn't do anything to Buna-N!

....Cotten

Please excuse my ignorance, but what is P4gas. Is that regular petroleum, like before ethanol. please explain a little more for me. Apparently i must have missed some other post where you already explained this.

 

[Cotten]

... but what is P4gas.

Ckunsman89!

Just say it real slow a few times: pee,... for,.... gas.

(The Nightshift coined that one, sorry.)

....Cotten