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carburettor synchronization (Read 6239 times)
Lutz(Guest)
Ex Member



carburettor synchronization
10.07.99 at 10:01:00
 
Found some very good hints for selfmade synchronization tool on the following homepage, have a look ! Lutz

 
 
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Matt Nicholson(Guest)
Ex Member



carburettor synchronization
Reply #1 - 23.07.99 at 17:38:00
 
Any chance of an English translation ???

 
 
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Lutz(Guest)
Ex Member



carburettor synchronization
Reply #2 - 29.07.99 at 11:00:00
 
I'll have a try for a short version next week ...

 
 
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Gianni(Guest)
Ex Member



carburettor synchronization
Reply #3 - 30.07.99 at 00:55:00
 
please, sent me too.
Tahnks

 
 
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Manfred(Guest)
Ex Member



carburettor synchronization
Reply #4 - 29.07.99 at 15:23:00
 
Lutz,
please send it to me as well, and i'll post both,
the german and the english version here in the 'Info'
section.
Manfred

 
 
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Klaus(Guest)
Ex Member



carburettor synchronization
Reply #5 - 08.08.99 at 13:55:00
 
Heres the iinklisch Version:
a semi-automatically translated version...
i corrected a little bit, but...
well...
o.k.,
it'll give you the idea!?

http://igv113.igv.kfa-juelich.de/frank/moppel/synchro.html

   Self made Carb synchronisation tool

         After stripping down and cleaning of the carburetors - or in the course of an
         inspection is the synchronisation of the carburetors an
         indispensable precondition for a normal engine run.
         In the accessory trade for this different manometers are offered,
         most well-known are by Boehm (obtainable over
         H.Gericke/Louis/Polo etc.), for however the proud price of DM 400,
         - for a four-he clock set (for synchronizing 4-Zylindern) over the
         loading bar goes.
         " something " more favorably (i.e. approx. 20, - DM: -) one can
         make do with a self's building. Those before racks superstructures
         offer here besides still the advantage of by far higher precision than
         the commodity.
         The principle is based on the fact that not the absolute negative
         pressure in each single carburetor is measured (and these in such
         a way co-ordinated that suppresses is as alike as possible), so that the
         differences of pressure between the single carburetors to be
         measured is adjusted to " zero ", i.e. if the differences of
         pressure between 2 carburetors are " zero ", then the pressure
         in both is the same and the are synchronized..
 
       Material for 2 cylinders (matter of expense approx. max. 15 DM)
        approx. 2 m transparent plastic hose, inside diameter of approx. 8
                 mm, as thick-walled as possible (building market, DM 1, /m)
       1 x 3 cm transparent plastic hose, inside diameter approx. 3 mm, outside
                 diameter approx. 8 mm, for the absorption approx.
       2 x 0.5 m negative pressure hose, inside diameter of approx. 3-4 mm (must
                 sit tight on the measuring taps of the carburetor); (approx. DM 2, /m)
       2 quick coupling line connectors (as reducer)
                 (laboratory requirement, approx.. DM 1.50 Stk.)
       Hose clips
       some ccm waste oil and if necessary some Silikon/Sikkaflex a piece of
                 Mounting cardboard
     
            Material for 4 cylinders:
             4x1 m + 1x10 cm transparent plastic hose, as described above.
             4 x  3 cm transparent plastic hose for the absorption, s.o. approx. 4 x 1
             m negative pressure hose, as above described
   4 quick coupling  line connectors (as reducer) and
   4 T-fittings (laboratory equipment, approx.. DM 1.50 Stk.)
   Remainder see above
     
             Structure for 2 cylinders
             The transparent hose diehnt as tubing and is filled to the half with
             oil. Into the center of the hose one shifts beforehand approx. a 3
             cm long piece of Plasic tubing (outside diameter according to the
             inside diameter of the tubing, inside diameter of max. 3 mm). Here
             still another drumwickeln and a hose clamp put bischen assembly
             belt, with which the interior tube fixed and whose diameter can be
             again reduced. The negative pressure hoses are then set with the
             reducers on the ends of the tubing, fixed with hose clamps and
             sealed if necessary with Silikon/Sikka. The ends of the negative
             pressure hoses on the measuring taps of the carburetor put, if
             necessary. protect with hose clamps. The negative
             pressure/gasoline hoses worked satisfactorily, since normal PVC
             hoses at the hot links become the carburetor soft and thus leaky.
             The tubing can be mounted on a board measuring appr. 1m
            The assembly can be tested e.g. also under water for tightness.
     
     
   Picture is valid for a twin , 4 cylinder will follow soon..
     
                       to carbs
                      |  |                    |  |
                      |  |                    |  |
                      |  |                    |  |
                      .  .                    .  .
                      .  .                    .  .
                      .  .                    .  .         subpressure hoses
                      .  .                    .  .
                      |  |                    |  |
                      |  |                    |  |
                      |  |                    |  |
                      /  \                    /  \
                     |    |                  |    |        Red. fittings
                    |\    /|                |\    /|
                    | \  / |                | \  / |
                    |      |                |      |
                    .      .                .      .
                    .      .                .      .       transparent hoses
                    .      .                .      .        menisci
                    .      .                .      .
                    |      |                |      |
                    |------|                |------|   <- Meniskus oil
                    |      |                |      |
                    |      |                |      |
                     \      \               /      /
                      \      ---------------      /
                       \       --------          /
                        \      --------         /
                          ---------------------
                               ^
                               |
                      small dia for dampening
                    clamp for adaption of dampening characteristic
             If one wants to measure 4 cylinders at the same time, one must
             together-wedge 4 tubing with T-fittings and attach in each tubing an
             absorption tube + hose clip.
             Mode of operation:
             For the correct mode of operation of a  Subpressure (equal pressure)
             carburetor it is indispensable that in
             every single carburetors the same
             negative pressure prevails. Generally the objective is to minimize the
             difference of pressure between two single carburetors the service
             manual or the friendly dealer gives information over the max.
             permitted difference of pressure (depending upon type between
             approx. 20 and 70 mbar). If one measures the printing with a water
             gauge, then 1 cm climbing height corresponds to about 1 mbar. Oil
             is somewhat lighter than water, but viscous and thus is better
             the dampening characteristics.
             The latter means that, in connection with the flow reduction in the
             absorption tubes, which have menisci fewer the tendency to follow
             the ' pumping cycles ' the cylinder and during a longer period it
             averages.
             Methodology with the measurement:
             Engine on operating temperature bring (with cold engine do not
             measure), and over the training run number of revolutions adjusting
             screw the training run easily increase (approx. 2000 rpm). Engine
             store and the hoses of the manometer to the taps intended of the
             carburetors attach. Engine again start and with the butterfly valve
             adjusting screws the flaps in such a way adjust that the relative
             differences in height of the oil menisci are smaller than approx. 10
             cm. For security still the individual links can be interexchanged now
             in order to adjust any differences in the measuring
             hoses.
     
     
                 the service manual gives information over the max. permitted
                 difference of pressure (depending upon type between approx. 20
                 and 70 mbar). 1 cm climbing height (i.e. difference between left
                 and right meniscus) corresponds about 1 mbar to difference of
                 pressure i.e. max. measurable difference of pressure about 100
                 mbar. Use of oil: viscously i.e. improves absorption characteristics,
                 i.e. the oil flows more slowly and does not swing not with the engine
                 speed up. Besides does not occur to the engine so much, if a
                 bit of oil should be clean-pulled into the carburetor; -) Absorption
                 with the hose clip in such a way stop that the menisci vary not with
                 the engine speed and remain enough time to reach into the case of
                 a large difference of pressure to the Killswitch before the oil
                 column is pulled into the carburetor.
       
         After a complete disassembly of the carburetors large
         differences of pressure are normal, one must the engine off here
         fast really switch, particularly since due to the sluggishness of the oil
         the meniscus can rise also still after power-off off further. If the
         difference of pressure is very large, only times everything for
         (check Un)tightness, before one adjusts the whole carburetor.
         Better than 10 mbar (i.e. 10 cm difference in height of the menisci)
         anyway hardly adjusted. The menisci show themselves
         sometimes somewhat with difficulty, if still oil sticks to the inner wall
         of the hoses. Here one lights up simply with a strong
         flashlight from above on the menisci.
         For further questions: eMail me at
 

 
 
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Jürgen(Guest)
Ex Member



carburettor synchronization
Reply #6 - 26.08.99 at 13:22:00
 
I did it and it was working very good.
Thanks for yout hint!
Jügen

 
 
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lochan(Guest)
Ex Member



carburettor synchronization
Reply #7 - 08.09.00 at 20:49:00
 
dear sir,
        i am a mechanical enng. student stduyin in india.please mail me as much info about carburettors which can prove tobe usefull in my project.
my e-mail:lochan_33@123india.com

 
 
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