Text 14618, 74 rader
Skriven 2011-02-28 13:40:00 av Roy Witt (1:387/22)
  Kommentar till text 14583 av Björn Felten (2:203/2)
Ärende: LOL! Svedes...                      was: Canadadian wonders (was: Defec
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28 Feb 11 00:55, Björn Felten wrote to Roy Witt:


 RW>> Not to mention the seals in the lines. How much do you think it will
 RW>> cost to rebuild just the injector system in that car?

 BF>    Should I ever have to do that, it would probably cost quite a lot
 BF> -- even if not as much as in the US. Spare parts from Germany doesn't
 BF> cost so much, and the Bosch Jetronic system is very common in many
 BF> different makes here, so it's not dedicated Mercedes parts.

OK.

 BF>    But, once again, I have more than ten years of experience on three
 BF> different cars now, and never had any problems.

 BF>    I don't know how the gaskets, seals and other stuff on US cars are
 BF> designed, but on the Mercedes there are no plastic or rubber parts
 BF> that's in contact with the fuel.

I beg to differ there. If there's a gasket, seal or o'ring in that system,
they will be in contact with whatever fuel they seal. Like the MB, the US
automakers use Viton, a brand of synthetic rubber and fluoropolymer
elastomer to seal the fuel system.

 BF> Besides, rubber and plastic are more vulnerable to petroleum products
 BF> than to alcohol

Petroleum products aren't as volatile as alcohol, which has a drying out
effect even on synthentics.

 BF> -- as anyone who tried to save a few bucks on replacing such parts
 BF> with non petroleum resistant ditto probably can vouch for.

In a pinch, I've used synthetic rubber hose intended for automatic
transmission fluids to connect fuel lines. It will begin to break down in
less than a day, contaminating the fuel.

 RW>> I would think just the opposite would happen since it's designed to
 RW>> run on gasoline (petrol). Not to mention the increase in oxidation
 RW>> damage done to the fuel system by moisture absorption due to the
 RW>> presence of alcohol.

 BF>    Wrong on both accounts.

You're saying that alcohol doesn't absorb moisture from the atmosphere?

 BF>    A) Every combustion engine is designed to run on anything that
 BF> combusts.

Try running a 22:1 compression ratio diesel engine on gasoline...

 BF>    B) The oxidation problem is greater if you do not use any alcohol
 BF> at all, since then the water will remain at the bottom on tank,

Ask any distiller how well alcohol absorbs moisture, adding more alcohol
to the tank only serves to absorb more water...engines can't burn water.

 BF> hoses, filters and other cavities. But this problem was solved a
 BF> century ago. Nowadays the entire fuel system on every decent car
 BF> should be totally corrosive resistant.

Key words: should be. I've seen in-tank fuel pumps that had plastic parts
corroded by fuel. Fuel rails that sit over fuel injectors are made of
aluminum. Fuel injectors that have been corroded by fuel passing through
orifices designed for the job. Nothing is ever corrosion proof. Even the
stainless steel lines used in fuel systems get corroded over time.

                R\%/itt

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