E10 Fuel O Rings

[Duccout]

Confused? We all are!: 'Standard grades of Viton do not offer resistance to ethanol and should not be used'.

So, what is a 'standard grade' of Viton? How does one tell? What is a non-standard grade called?


Please can we have our proper petrol back!

Colin

[Jordan]

Many carburettors use all-metal float needles.

[themoudie]

Good evening Colin, et al,

This link to a pdf published by 'Viton', I think answers your questions.

The problem is "Can you believe the selling agents blurb?" eBay independant sellers maybe buying direct from unknown Far Eastern suppliers.

Have Dellorto, AMAL, et al prepared themselves for this and do their suppliers use the appropriate polymers?

This paragraph from the linked pdf says it all

The physical properties of vulcanizates based on Viton™
fluoroelastomers are determined to a large extent by the
type and amount of the filler(s) and curative(s) used in the
formulation and by the temperature and duration of the
curing cycle used in their manufacture.

Tamper with the ingredients and/or the recipe and you may be in trouble!

Link: Viton-selection-guide

Furthermore, AMAL have this page on their website, specifically answering questions about E5 and E10 fuels: AMAL_ethanol-fuels_advice
N.B. this upgrade was expected to be completed by 2012!

Good health, Bill

[Ventodue]

Dellorto makes a needle valve for methanol . it is not rubber tipped so no problems with the viton tip

Eldert

Thanks, Eldert. Do you have a part number or reference? Or know where to buy? Or ....?

[Ventodue]

The o rings fit. So here we go: if anyone is looking to replace their Dell'Orto choke jet o ring ... <snip>

Thanks Colin.

[Ventodue]

<snip. Furthermore, AMAL have this page on their website, specifically answering questions about E5 and E10 fuels: <snip>

I dunno, the standards of today's education. Did no-one tell the author, 'A preposition is not a word to end a sentence with'?

"The addition of ethanol to petrol has an effect on both the performance of an engine and also its interaction with the different materials it comes into contact with".

(And there's no apostrophe in "1970s" or "FFVs".)

Grumpy old fuddy duddy, me

[Duccout]

[Jordan]

Call me pedantic, but there is only so much up with which I will put.

[Ventodue]