background image

rubber hose (respective order references VMLFIXADP5 & VMLFIXADP6) or in short configuration 
without hose, (order reference VMSFIXADP5 or VMSFIXADP6). 

     

 

 

 

 

 

 

 

 

When the fuel is supplied through an automatic fuel valve, it is usually connected to one of the 
vacuum ports. By using the Tee-piece (illustrated above) & it’s short piece of hose, included with the 

VacuumMate, 

the

 

fuel valve can remain connected, so that fuel can flow while synchronising. 

Another possibility is to use a vacuum hand pump to keep fuel flowing (illustrated above, the 

MityVac 

#4000, 

available from VacuumMate distributors). The advantage in this case is that there is no 

influence of the

 

fuel valve on the vacuum readings

.

 

 

7. HOW TO PROCEED 

 

To start

 

Make the necessary pneumatic connections. It is best to connect the channel 1 hose first. Start the 
engine and let it warm up. Connect the 

VMR6WS

 to a suitable battery or dc electrical input. If using 

the 

VMR6ME 

model: move the battery selector switch lever from left to right to reset it to “ON”, as it 

has an auto-switch-off feature which switches off the VacuumMate when there has been no “activity” 
for 5 minutes to protect it’s rechargeable internal batteries. 

 

 

                       

 

 

 

 

 

 

 

 

 

 

                                                   5 

Содержание VacuumMate Allweather

Страница 1: ... a stable engine idle speed and a good engine response VacuumMate has four highly visible LED bar graph displays for monitoring up to 4 channels or 4 cylinders These fast precise frictionless columnar displays replace outdated toxic mercury columns VacuumMate s compact size weight allows use anywhere whether in the workshop or at the track the ideal tool for the professional mechanic for power spo...

Страница 2: ...lack the speed precision needed to follow DYNAMICALLY the very fast fluctuations of the vacuum waveforms themselves so as to monitor the heights and relative positions of the crests and troughs of the waveforms of each cylinder And it is only by monitoring and displaying these DYNAMIC characteristics that one can reveal the existence and nature of engine seal defects which will distort thwart atte...

Страница 3: ...pletion of the synchronising task The RPM mode displays engine speeds from 500 to 2500 rpm with 50 rpm resolution The 2 stroke 4 stroke selector switch 11 illustration inside front cover allows correctly displayed values for both types of engine Incorrect selection will display either double the true RPM 4 stroke selected for 2 stroke or half of it 2 stroke selected for 4 stroke 5 POWERING THE VAC...

Страница 4: ...e fitted to external nipples protruding from the enclosure The VacuumMate hoses are oil fuel resistant and any replacement hoses should be of a similar specification You are advised to replace hoses only with original VacuumMate replacement hoses available individually order reference VMHOSE see 9 SERVICE The SERVICE MANUAL of the engine manufacturer should indicate where to make the necessary hos...

Страница 5: ...to keep fuel flowing illustrated above the MityVac 4000 available from VacuumMate distributors The advantage in this case is that there is no influence of the fuel valve on the vacuum readings 7 HOW TO PROCEED To start Make the necessary pneumatic connections It is best to connect the channel 1 hose first Start the engine and let it warm up Connect the VMR6WS to a suitable battery or dc electrical...

Страница 6: ...lly you should start adjusting the carburettor next to the fixed one The object is to achieve the same reading on each of the channels during idling unless the values specified for a particular engine are slightly different for specific cylinder manifolds Some examples of such engines 4 stroke Mercury and Yamaha outboard motors Honda s VFR800 motorcycle engine Start with the scale range switch in ...

Страница 7: ... air entering the intake system Compression loss Background information The diagrams below show some more realistic examples of pressure waveforms which can occur in the intake manifold of a 4 stroke engine Compare with the drawings on page 2 The pressure scale orientation has been deliberately inverted so as to rather show vacuum scale so as to correlate with the LED displays of the VacuumMate Th...

Страница 8: ...re are no scale markings for the DYN mode as the purpose is not to measure but rather to compare the connected channels A light column extending downwards into the P zone below the Pa level means POSITIVE pressure higher than atmospheric upwards into the P zone means vacuum Some abnormal display patterns are shown above centre and right The nature of the waveform anomaly reveals the nature of the ...

Страница 9: ...ontinuously connected with the intake system During the combustion cycle a high pressure wave will blow back to the carburettor creating positive pressure in the intake manifold The trough of the vacuum wave form the low point of the displayed dynamic band of that cylinder will move under the Pa line towards the P side reflecting this positive pressure EXAMPLE 2 LEAKING INTAKE VALVE The normal wav...

Страница 10: ...absolutely sure there is no water inside the unit or in or around the DC power inlet In case of malfunction following immersion please return to your distributor for checking and repair Calibration This instrument has been carefully checked and calibrated at the factory and in normal use calibrates itself automatically against day to day changes in barometric pressure However after a time gradual ...

Страница 11: ...otentiometers Adjust ONLY the 8 trimmers grouped in 4 pairs on the right Do NOT adjust the other trimmers The calibration trimmer positions are marked on the lower edge of the control panel HOW TO CALIBRATE PROCEDURE Select VAC 35 55 cm Hg and AVE with the switches on the control panel Create a vacuum of 70kPa 700mBar 52 5cmHg with the hand operated vacuum pump Adjust the SPAN trimmers until 52 5c...

Страница 12: ...tion special accessory for calibrating VMLFIXADP5 Permanent E Z fix connection adapter with 40 cm hose M5 thread VMLFIXADP6 Permanent E Z fix connection adapter with 40 cm hose M6 thread VMSFIXADP5 Permanent E Z fix connection adapter without hose M5 thread VMSFIXADP6 Permanent E Z fix connection adapter without hose M6 thread Limited Warranty VacuumMate is guaranteed against defects in manufactur...

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