PAO Allard Turbo - UK

PAO Preparations Limited, 38 Newport Street, Swindon, Wiltshire, UK (in 1980)  

 Range Rover 3,5 ltr V8
Turbocharger installation
              

 
P A O Preparations Limited in Swindon, Wiltshire, or PAO Allard turbo charging systems offered
turbo motor tuning systems and kits for European vehicles, like Ford and other, plus for Rover V8
vehicles like Range Rover and Rover passenger car in the 70's and 80's. 
Even today Allard turbo charging systems are offered via the company Allard Turbo Sport Ltd, especially for improving turbo diesel engines.


(From the PAO sales literature in 1980):
ROVER 3.5 LTR V8 TURBO CHARGER INSTALLATION

EXTENSIVE TESTS SHOW:
* VASTLY IMPROVED ACCELERATION
* UP TO 35% INCREASE IN POWER
* SUBSTANTIALLY IMPROVED LOW SPEED PUNCH
* VERY QUIET IN OPERATION LESS GEAR CHANGING
* SIMPLE SERVICING
* MINIMAL INCREASE IN FUEL CONSUMPTION
* IMPRESSIVE OVERALL PERFORMANCE

The Rover Turbocharger Installation:

The matched turbocharger unit is mounted on a specially designed exhaust manifold, which makes 
the installation suitable for right and left hand drive vehicles.

A special connecting exhaust pipe linking the two exhaust manifolds incorporates a wastegate boost pressure regulator valve, which is designed to limit maximum boost to 5.0 p.s.i. to maintain maximum engine reliability.

By careful positioning of the turbocharger, no bodywork modifications are necessary, and repositioning 
of ancilliary equipment is kept to a minimum. A heatshield is fitted to protect ancilliaries from the heat    PAO Allard Turbo used a single turbo charger giving 35% increase
dissipated by the exhaust turbine.

The standard inlet manifold is retained, and fitted with a manifold pipe assembly to connect compressor 
delivery to engine.

A modified 1 3/4"SU carburettor is mounted on a specially designed manifold incorporating a water 
hot spot and brake servo vacuum union, and fitted with a non-restrictive paper element air filter.

A large bore free flow exhaust system, incorporating standard silencer and resonator box, is included 
in the installation, together with boost pressure gauge and set of 'colder' grade spark plugs.

ROAD PERFORMANCE

The use of a relatively low boost assures maximum engine reliability with no internal engine modification, 
yet produces up to 35% improvement in power at the same maximum engine rpm as the 
un-turbocharged engine. Low speed pulling power and flexibility is also substantially improved.

Due to the efficiency of the turbocharged engine, it has been shown that overall fuel consumption is 
NOT appreciably increased, and in many cases is ACTUALLY IMPROVED.

On the road, it will be immediately apparent how quiet and smooth the engine is, yet the extra power      Rapport Ltd in UK offered the Range Rover Rapport Turbo conv.
is available over a wide rpm range at a touch of the throttle.                                                                 supplied from the PAO Allard Turbo in UK

Due to the extraction of heat energy by the exhaust turbine from the exhaust system, the turbocharger 
acts as an efficient silencer. Only a single big bore exhaust pipe connecting to standard system is 
required. However, a free flow outlet from the turbocharger with a minimum bore of 2 1/2" is essential for 
optimum turbocharger throttle response and efficient operation.

On the low compression 8.25:1 engine, the standard compression ratio can be retained for most 
applications, but the compression ratio of the higher compression engines must be reduced by fitting 
the low compression pistons.

The only other engine modifications are a re-setting of the ignition advance and the fitting of a colder 
set of spark plugs. However, an oil cooler installation should be incorporated if any heavy duty work 
is contemplated, as the turbocharger and engine must have an adequately cooled oil supply.

SERVICING AND MAINTENANCE

Because the installation incorporates a single 1 3/4"SU,the carburation requires minimal attention and, 
due to the uncomplicated lay out of the installation, little additional servicing is required. However, the     Range Rover Classic with PAO Allard Turbo - for sale recently
engine oil should be changed regularly.

WE ARE CONFIDENT THAT WE HAVE PRODUCED A TURBOCHARGER INSTALLATION WHICH 
GIVES THE KIND OF REFINED HIGH PERFORMANCE WHICH IS NORMALLY LACKING IN THE 
ROVER, PARTICULARLY WHEN HEAVILY LADEN.

WHY NOT TRY IT !!! WE'RE SURE YOU'LL LIKE IT!!

Our demonstrator is available by appointment.



UNIVERSAL & PROTOTYPE KIT

We are a distributor for a wide range of turbochargers and components. These turbocharger units are designed with suitable seals for mounting the carburettor on the compressor inlet, which allows a 
much more simple turbocharging system for most engines.
Controls include a boost control valve, which limits maximum boost pressure according to the spring fitted, and an exhaust 'wastegate' by-pass valve.

Universal or prototype installation kits for four, six and eight cylinder engines comprise the main components you will need for a complete installation to be made upon those vehicles for which we do not hold in stock a complete kit. 
We can supply turbocharger units to suit most applications for engines ranging in capacity from 800 to
6000 ex., and can offer an advisory technical service to ensure that the 'd.i.y.' installation is a complete success.

Correct matching of the turbocharger to each particular engine is essential. If the correct matching is 
not achieved, the overall efficiency will be low, and, in some cases, damage may be caused to the 
engine.

We do, of course, design, manufacture and fit turbocharger conversions, the cost of this varying 
according to the complexities involved, and this includes the 'one-off conversions as well as the more 
regularly requested installations. We are always pleased to give a quotation, whatever your 
requirements may be.

We recommend that you read "Turbochargers" by Hugh Maclnnes, which will tell you everything you 
might wish to know about the theory and practice of turbocharging. It is available from the above address 
for £5.00 including postage and packing.




An Introduction to Turbocharging

(a) What is Turbocharging?
Turbocharging is a method of utilising the exhaust gases of a petrol or diesel engine to drive a small 
turbine wheel.   
This turbine wheel drives, on a common shaft, a small compressor turbine.   
This compressor pumps air into the engine, thus providing a denser charge of air and fuel.
This turbo charge, forced into the engine under 'boost' pressure, is responsible for an increase in 
power output.   The increase is approximately proportional to boost pressure.   
The strength and design of the original engine limits the amount of 'boost' that may be used.   
For road vehicles between A p.s.i. and 9 p.s.i. is common.

(b) Why Turbocharge?
Manufacturers of motor cars are using turbochargers for two main reasons: either to increase the 
power of an engine to provide higher performance, or to boost the power of a small engine to enable 
it to do the job of a large engine, whilst retaining the economy of a small unit.

Turbocharging is a method of providing an engine with increased performance, greater smoothness 
and quietness, with the major advantages of sensible fuel consumption and low exhaust emissions.
 
(c) Will Turbocharging damage an engine?
Turbocharging is a safe, reliable method of increasing power output, provided that:
(i)   the amount of boost given is strictly limited, preferably by a 'wastegate'.
(ii)   the design of the installation is sound
and is properly engineered to take account of the extra heat generated under the bonnet.
A poor installation may damage other components under the bonnet and could result in all kinds of 
difficulties; poor starting, poor idling in traffic, lack of low-speed pick up, a sudden transition to boost 
and so on.
To provide a smooth, tractable performance the turbo system must be carefully 'matched' to the 
engine being converted.    Once the original installation has been properly set up it will require no 
special attention.

(d) How much faster will a Turbocharged vehicle go?
This question needs to be put another way.   The real issue is: if you want your vehicle to exceed 
the speed recommended by the manufacturer, are you prepared to spend money on the brakes, tyres, 
cooling system, etc?
It is irresponsible for any turbocharger supplier to suggest that a turbocharger will increase the top 
speed of a vehicle, unless they intend to offer a package of other modifications.

(e) How much more power will a turbocharger produce?
Again, the question is best answered by another; how much money are you prepared to spend on 
modifying your engine?
If you do not wish to modify the engine in any way, the amount of extra power extracted must be 
limited to that which can be reliably tolerated by the engine.    In general up to a maximum of 50% 
improvement in power output may be obtained.   However, this level of increase will almost invariably 
require a reduction in the compression ratio of the engine.
 
Beware of any conversions that are claimed to increase power output by more than 50% or that require 
'boost' pressure to exceed 5 p.s.i., without the need for engine modification.   The result may be a holed 
piston or a wrecked engine.

(f) Will a turbocharger invalidate the warranty on a new vehicle?
Yes.   However, any responsible supplier will only offer proven conversions, on which he has carried out 
long term testing.    Some suppliers may soon be able to offer their own warranty on engine and transmission.   
Normally, they only guarantee the turbo installation itself.

(g) How will my insurance be affected?
Our Broker has usually been able to obtain cover with a loading of only 157», subject to the driver's record.

(h) How much will it cost to have a turbocharger fitted?
P.A.O. Allard Turbosystems range from £800 to £1750 fitted.   
They all include an engine monitor gauge and, where necessary, an oil cooler.    
In certain cases, a reduction in engine compression ratio will be required, for full engine reliability.
Beware of cheap or "kit" conversions.   A properly engineered conversion will not be cheap, but will provide 
reliable, smooth performance.

P.A.O. Allard offer a wide range of standard conversions and can quote for prototype work.   
For further details contact ourselves, or an authorised Dealer.