I am going to have to side with John C. at http://aircooled.net and
Rob ‘aussiebug’ and Dave at http://vw-resource.com .

Here are two more links:

http://aircooled.net/new-bin/viewpro... 200891080108


Solex, Brosol, Bocar and Kadron Main Jets
Part #: FSK0043
Price: $ 7.00 Due to oxygenated fuel, bumping your main jet size up a
little will make your car run better AND cooler. We recommend 130 the
34-3, and Kadron applications, even though Kadrons have 135s when new.
You need 1 main jet per carburetor.

------------------------------------

http://en.wikipedia.org/wiki/Ethanol...nd_controversy

Fuel system problems
Several of the outstanding ethanol fuel issues are linked specifically
to fuel systems. Fuels with more than 10% ethanol are not compatible
with non E85-ready fuel system components and may cause corrosion of
ferrous components.[126][127] Ethanol fuel can negatively affect
electric fuel pumps by increasing internal wear,[127] cause
undesirable spark generation,[128] and is not compatible with
capacitance fuel level gauging indicators and may cause erroneous fuel
quantity indications in vehicles that employ that system.[129] It is
also not always compatible with marine craft, especially those that
use fiberglass fuel tanks.[130][131]
Using 100% ethanol fuel decreases fuel-economy by 15-30% over using
100% gasoline; this can be avoided using certain modifications that
would, however, render the engine inoperable on regular petrol without
the addition of an adjustable ECU.[132] Tough materials are needed to
accommodate a higher compression ratio to make an ethanol engine as
efficient as it would be on petrol; these would be similar to those
used in diesel engines which typically run at a CR of 20:1,[133]
versus about 8-12:1 for petrol engines.[134]

In April 2008 the German environmental minister cancelled a proposed
10% ethanol fuel scheme citing technical problems: too many older cars
in Germany are unequipped to handle this fuel. Ethanol levels in fuel
will remain at 5%.[135]




------------------
On Jul 30, 3:52 pm, wrote:
> On Jul 29, 9:05 pm, wrote:> My Beetle's engine has been running hot, gas bubbles in the carb, and
> > it doesn't have the performance it used to have?
> > I checked out everything like:
> > * Tune-up and
> > * compression check
>
> > Do you think it might have anything to do with the 10% ethanol Gas?
>
> > Any help will be appreciated!
> > Thanks In Advance!
>
> ---------------------------------------------------------
> I found two good links.
>
> http://www.vw-resource.com/additives.html#ethanol
>
> Here is a quote from the link above:
> "However, no one has picked up the subject of older carbureted cars.
> The addition of ethanol to gasoline causes big problems in a VW
> engine, as ethanol makes the engine run 4% leaner. To compensate for
> 10% ethanol in gasoline (called E10 in some places), you must increase
> the main jet by two steps (e.g., from X125 to X130) and the idle jet
> by one step (from 55 to 60), as 10% ethanol makes the engine run 4%
> leaner."
>
> Here is another good link:http://aircooled.net/gnrlsite/resour...es/jetting.htm
>
> Here is a quote from this link:
> "Why Jet? If it's too rich, the extra fuel will wash the oil off your
> cylinders and wear out your pistons, cylinders, and rings quickly (no
> oil), in addition to building up deposits on your valves, heads, and
> piston tops. If it's too lean, the engine will run very hot, misfire,
> and can eventually lead to a burnt valve(s). Get it right!"