What compound orings are the best for 220 tbi injectors?

[man-a-fre]

Would fkm orings be better than nitrile orings on the injectors? What was the factory oring material ? Seems the new ethanol fuel is getting harder on things. Will they both seal the same in the cold temps ?

 

[Scooterwrench]

Silicone o-rings hold up better to ethanol. Green,blue or orange.

 

[tayto]

i would think viton would be a good choice here and probably able to source locally

 

[Scooterwrench]

i would think viton would be a good choice here and probably able to source locally

Ethanol dries the natural oils out of Viton o-rings then they crack and crumble.

 

[tayto]

Ethanol dries the natural oils out of Viton o-rings then they crack and crumble.

i think you have your materials swapped

 

[JDGMC]

Viton - high temperature is the driver.

 

[GoToGuy]

High temperature usually refers to higher than 200° F.

 

[GoToGuy]

What are " FKM " O rings?

 

[tayto]

What are " FKM " O rings?

Fluoro-Elastomer is usually referred to as FKM FPM or as VITON™

(stolen from google)

 

[tayto]

Ethanol dries the natural oils out of Viton o-rings then they crack and crumble.

eFunda: O-Ring Materials Compatibile with Chemical Ethanol

www.efunda.com

looks like the best material is a mixture of silicone and viton called "Fluorosilicone"..go figure