We do so many of these we now have the
conversion time down to 3 days the tank is installed into the space where the
spare wheel lived the filler is installed in the blank in the bumper and the
switch is installed on the last blank on the top row
Here's the walk through of the gas conversion
When the car comes in for conversion the first thing we do is protect it the
bodywork around the bonnet area is bubble wrapped the interior seats are covered
with seat covers and the steering wheel hand break and gear leaver are wrapped
in Clingfilm but we also put a floor mat in to protect the carpet/mats.
The next thing is to check the emissions this is very important as these figures
we are going to improve on. The gasses we are interested in are as follows
Hydrocarbons (HC)
Hydrocarbons are unburnt or partly burnt fuel High HC levels in the exhaust
indicates ignition problems such as defective plugs or HT leads, incorrect
timing, vacuum leaks, incorrect air/fuel ratio, or engine mechanical faults. In
fact, anything that causes inefficient combustion will release un-burnt
hydrocarbons into the exhaust.
Carbon
Monoxide (CO)
Carbon monoxide is formed by the partial burning of fuel due to a lack of
oxygen. A low proportion of CO indicates how well the air/fuel ratio is
maintained. A high proportion of CO in the exhaust indicates a rich fuel
mixture, choked air filter, choked PCV valve or low idle speed. Low CO indicates
a lean fuel mixture or vacuum leak.
Carbon Dioxide (CO2)
This is a product of an efficient engine. With low HC and CO levels, the
percentage of C02 in the exhaust is likely to be 13 to 15%.
Oxygen (02)
A small proportion of oxygen, 1-2%, will be left after correct combustion. Too
much or too little indicates an incorrect air/fuel ratio, ignition or mechanical
problems or an exhaust leak.
Oxides of
Nitrogen (NO)
Nox is a poisonous gas that is formed when combustion exceeds 2500C. Various
engine controls, such as EGR are used to minimize its emission.
From the gasses above we can evaluate the lambda or AFR (air to Fuel ratio) and
how well the engine is running
We then check the OBD (on board Diagnostics) after that start on the conversion
by removing the inlet manifold drill and tap and fit the nipples that will
deliver the gas to the engine the manifold is then cleaned and re fitted.
Two tee’s are fitted into the coolant system this is for the heat transfer to
the vaporiser and the gas injectors and water is plumbed in then the wiring is
completed and the system is checked.
The tank is then fitted and the filler point is installed, last but not least
the front to rear pipes and cables are installed the vehicle is filled with gas
and then tuned (far too complicated to explained) Job is taken on a road trial
and then handed to the customer.