Question Regarding Sbp Fuel Filter

[happycheapskate]

Cheers! I found a local gas station that only sells non-ethanol gas. I've been using the 10/90 ethanol gas sold everywhere locally, with added Lucas upper cylinder lubricant. (small amount since it already has oil in the gas.)

Shortest explanation: Alcohol cuts the lubrication in the cylinder and may cause varnish or contamination. The biggest problem would be to 4strokes or high revving engines.

Longer explanation.

The alcohol is thinner and more volatile than plain gasoline, more acidic, and tends more to strip oil microscopically from the upper (above rings) cylinder walls, and may also thin the oil (in 4strokes) by blowing past the rings through the ring gaps or through blow-by. They tend to cause "scuffing" (an abrasion of the cylinder wall when a ring or piston's metal temporarily scrapes bare of oil, or even siezes for a fraction of a tiny instance by friction, but does not stop the engine.

Article from GM regarding ethanol fuels and ring coatings
http://www.sciencedirect.com/scienc...serid=10&md5=a079d3201d131896b2fcea3c574b2f75

Piston Ring damage? How? First I've heard of it.

 

[happycheapskate]

I would follow the instructions that come from the product seller or on the box. Many filters are designed to flow only one way, and may have several stages of filtration (smaller and smaller screens or different materials).

Good luck. I'm going to use a good quality industrial lawn equipment fuel filter (one thats ok for 2cycle mix, should be all of them but I'll look).

Does anybody know what size fitting to buy to replace the Grubee type petcock on the tank with a straight brass fitting (1/4" barb.) I wonder if its metric or what.

kewl mann fur sure! hey bro, you're probably gonna think this is a stupid question but hear me out. now usually you're supposed to install the fuel filter like described in the pic. I noticed that the side that the tank comes from has a hole and can get clogged where as the the other side works opposite of coure. wouldn't it be smarter to turn the fuel filter around so that hole to the sintered brass doesnt get clogged from the dirt in the tank?

 

[Pablo]

kewl mann fur sure! hey bro, you're probably gonna think this is a stupid question but hear me out. now usually you're supposed to install the fuel filter like described in the pic. I noticed that the side that the tank comes from has a hole and can get clogged where as the the other side works opposite of coure. wouldn't it be smarter to turn the fuel filter around so that hole to the sintered brass doesnt get clogged from the dirt in the tank?

Your picture is backwards. Who said "you're supposed to install the fuel filter like described in the pic."? Seems weird people would say this.

Our instructions:

Fuel Filter
Place the fuel filter between your fuel valve on your tank and your carburetor. The pointy end should face the tank. Be sure to take your fuel valve out and remove the stock screen

 

[AussieSteve]

heres the pic

That pic will mislead people for months. I use a very similar filter to the Sick Bike Parts one and it has an arrow on the side indicating the direction of fuel flow. As Pablo says, the fuel flows into the pointy end.
I've attached a pic of mine. It faintly shows the arrow.

... Steve

 

[Pablo]

That pic will mislead people for months

I was afraid of that!

 

[motorpsycho]

if you add upper cylinder lube to e-85 it should be fine, if e-85 is all you can find. upper cylinder lube is sometimes tough to find because it's normally used in race motors that run alcohol instead of regular gasoiline or race gas.
e-85 is escentially methanol which can be like 115 octane in some cases depending on what the e-85 / gasoline ratio is.
i would consider e-85 to be a "drier" fuel than 100% gasoline, and that's why you hear of piston ring problems in 4 strokes. adding upper cylinder lube will cure the problem, IF you're willing to spend the extra $$ to buy it. it might be easier to just find a place that sells regular gasoline.

 

[Tinker1980]

Cheers! I found a local gas station that only sells non-ethanol gas. I've been using the 10/90 ethanol gas sold everywhere locally, with added Lucas upper cylinder lubricant. (small amount since it already has oil in the gas.)

Shortest explanation: Alcohol cuts the lubrication in the cylinder and may cause varnish or contamination. The biggest problem would be to 4strokes or high revving engines.

Longer explanation.

The alcohol is thinner and more volatile than plain gasoline, more acidic, and tends more to strip oil microscopically from the upper (above rings) cylinder walls, and may also thin the oil (in 4strokes) by blowing past the rings through the ring gaps or through blow-by. They tend to cause "scuffing" (an abrasion of the cylinder wall when a ring or piston's metal temporarily scrapes bare of oil, or even siezes for a fraction of a tiny instance by friction, but does not stop the engine.

Article from GM regarding ethanol fuels and ring coatings
http://www.sciencedirect.com/scienc...serid=10&md5=a079d3201d131896b2fcea3c574b2f75

Your website demands a $31.50 fee to sign up and read the rest of the article. Not cool, lol

-Mark

 

[happycheapskate]

re: $31.50. Wow, sorry, I had no idea, I'll just copy it for you

I found this on a web search and did not pay anything to see it. I just thought it was relevant and interesting.

Lucas brand sells upper cylinder lubricant at truck stops in gallon jars and gas stations/auto parts for quart jars.
I am sure there is some alternative you can use (like more 2stroke oil).

Article

Tribological characteristics and surface interaction between piston ring coatings and a blend of energy-conserving oils and ethanol fuels

Abstract

The friction and wear performance of coatings on nitrided stainless steel (NSS) piston rings and chrome plated stainless steel rings sliding against cast iron cylinder liner segments in fully-formulated engine oils were investigated by using a high frequency reciprocating tribometer. The ring coatings include thermal-sprayed CrN and physical vapor deposited (PVD) diamond-like-carbon (DLC). The tribological characteristics of piston ring coatings were determined by applying several advanced piston ring coatings and energy-conserving lubricants containing friction modifiers. The impacts of E85 ethanol fuel (a fuel blend of 85% ethanol and 15% unleaded gasoline) on scuffing of the chrome-coated piston ring and cast iron cylinder liner segment were studied with different fuels varying in their degree of acidity. The tribological characteristics due to surface interactions between piston ring coatings and energy-conserving engine oils containing molybdenum dithiocarbamate (MoDTC) or an organic friction modifier were compared and analyzed. The test results show that the DLC coating produces the lowest wear on the cylinder liner segment and has a similar ring wear to nitrided and CrN coated piston rings. With MoDTC present in the engine oil, friction and wear are effectively reduced. The acidic fuel promotes the occurrence of scuffing.

Author Keywords: Friction; Wear; Piston ring; Cylinder bore; Coating; Engine oil; Ethanol fuel