Manfred's TR1. Discussion Boards

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
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. . . .
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. . . . subpressure hoses
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/ \ / \
| | | | Red. fittings
|\ /| |\ /|
| \ / | | \ / |
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. . . .
. . . . transparent hoses
. . . . menisci
. . . .
| | | |
|------| |------| <- Meniskus oil
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| | | |
\ \ / /
\ --------------- /
\ -------- /
\ -------- /
---------------------
^
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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