Baconsdozen Imperial Tools.
Gunsons colortune,adjust
carburettor mixture to increase power and economy.
Ideal for older or
classic cars with variable jet carburettors like SU or Stromberg or where the
needle can be adjusted (older Amal carbs),to adjust the mixture through the
whole rev range,Gunsons colortune is a tool used for setting and tuning
carburettorsThe colortune can diagnose rich or weak mixture in fuel inected
vehicles and help in jet selection on other carburettors. It can be used other
than at tick over to check the fuel/air ratio throughout the engines rev
range..The standard colortune fits the normal 14mm spark plug
hole a 18mm adaptor is used to fit the colortune in many classic cars and
older fords etc that use the 18mm spark plug holes,for smaller engines 10 and
12mm adaptors are available. The colortune is in effect a glass topped
spark plug,used to look right into the engine cylinders and observe the
combustion flame colour.By varying the mixture strength (which changes the
flames colour) the carburettor can be adjusted to optimise fuel economy and
increase power .The Gunson colourtune kits we supply come with full
instructions,an extension for the HT lead and viewing tube with
mirror.
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Gunson 14mm colortune kit.Ideal for older cars and
bikes with variable main jets (SU Stromberg etc) or where the needle can
be raised or lowered (Amal carburettor etc) but can check the mixture on
all engines .Gunsons colourtune is ideal for classic cars,you adjust
mixture strength by setting the combustion flame colour (same principle as
a bunsen burner) by looking through the glass top of the colortune into
the combustion chamber
Simple to use,the colortune temporarily replaces
one of the spark plugs.
A complete kit with extension
tube,instruction sheets,lead,mirror,cleaning brush and cowl, for14mm spark
plug thread £25.00 including post to UK.Larger picture click
here |
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| Colortune 18mm adaptor.Enables the standard 14mm
colortune to be used in some early Ford cars or American vehicles that
have a 18mm threaded spark plug.Allen key (supplied) is used to tighten
the adaptor and the colortune screws into it.£5..50 |
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| Standard Gunson 14mm colortune kit with the
addition of 10 and 12mm adaptors..This enables the colortune to be
used in virtually all cars,motorbikes,mopeds,scooters,lawn
mowers,generators,snowmobiles,garden machinery,chainsaws etc.£30..00.
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| 10 adaptor for the 14mm gunson colortune.Allows
the colortune plug to be used in engines that use a smaller spark
plug hole (motorbikes,quad bikes,mopeds,generators and chain saws
etc).Screws into cylinder head with a spanner,the colortune is then
screwed into the adaptor.Price £5..00p |
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12mm adaptor for colortune.Similar to the
above adaptor Enables a standard 14mm colortune spark plug to fit 12mm
spark plug hole.£5..00
Click
here for larger image. |
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The Colortune adaptors listed above
(10.12 and 18mm )can also be used to fit 14mm screw in type compression testers
etc to different sized spark plug holes.
Links to some other pages on this
site.
Gunson
Colortunes,Instructions for use.
Instructions are enclosed
with colortune kits we supply. With the engine at running
temperature a spark plug is replaced with the colortune.With the
engine ticking over the colour of the combustion flame can be observed
through the glass top of the colortune.A white or pale blue
flash indicates a weak mixture and an orange
or yellow colour indicates excess fuel.The mixture
screw should be adjusted to obtain a bunsen blue
colour.The mixture can be checked at higher rpm and pressing the throttle pedal
quickly should show a momentary enrichment before quickly settling back to
blue.If the mixture is too weak and can't be corrected with adjustment suspect a
vacuum leak or blocked jet(s) a vacuum gauge can help trace any leak.Trickling
Redex or a thin oil around suspect gaskets can reveal a leak as the oil is drawn
in and blue smoke comes out of the exhaust.A rich mixture especially at higher
revs might be a partially blocked or oil soaked air cleaner,too high float
level or a leaking float valve.
Before adjusting the mixture the
ignition timing should be checked and adjusted if necessary with a strobe
light,valve clearances and spark plugs should be checked and the air filter
cleaned or replaced if necessary.As far as we are aware the Gunsons Colortune
operates on standard fuel only,it will not give a correct reading on
methanol,heavy oil burning,excessive two stroke oils or the use of too much
of some additives may effect the combustion flame colour.The glass top of a
colortune is quite robust but can be cracked or damaged by dropping the unit or
running at maximum revs.The glass will get hot so take care in handling and
removing.As with any tuning aid if there are defects with the engine (timing
incorrect,valves badly adjusted or air filter choked etc) the colortune will not
work correctly.Serious engine faults resulting in oil burning and the use of
additives or two stroke oil can effect the accuracy of the colortune by
affecting the combustion flames colour.As far as we are aware the colortune will
not work correctly with methanol or similar fuels but unleaded or LRP fuels are
fine.
Baconsdozen
Imperial Tools.
13 Waveney Road
Lowestoft
Suffolk
NR321BT
E-mail sales 'at'
baconsdozen.co.uk
