Triumph Spitfire 4 Stage Tuning and Competition Preparation

The Triumph Spitfire 4 Stage Tuning and Competition Preparation book is the next item from the batch of books and manuals rescued by Colin Wake.  It was originally published in March 1965.

You can read or download the book from here:




To give you an idea of what the book covers here is the Forward page.

Forward

Since the introduction of the Spitfire 4, there has been an increasing demand for
improved engine performance to assist owners when participating in competition
events. To meet this demand, Standard-Triumph engineers have undertaken considerable
re-development work which has enabled them to increase the power of the
Spitfire engine unit and to make available the following two stages of tune. Each
stage involves the use of all components listed under the appropriate heading on
pages 13, 19 and 20.

The "Interim Stage", giving 70 b.h.p., requires very little modification to a basic
engine, the differences being confined primarily to the fitting of a Solex compound
carburettor with aluminium inlet manifold, a four-branch exhaust system and raising
the compression ratio to 9.75 : 1.

The "Stage II" tune is an extremely comprehensive racing conversion which makes
possible a power output of 90 b.h.p. approximately. This is achieved by using a
four-port cylinder head of 10·5 : 1 compression ratio with two Weber carburettors,
a modified camshaft and a four-branch exhaust manifold. When making this conversion,'
serious consideration should be given to the instructions made in the text regarding
the use of a stronger crankshaft, pistons and connecting rods, diaphragm clutch and a
modified gearbox.

Being supplementary to the Workshop Manual, which should be used when general
data, special tools, nut tightening torque and detailed dismantling and assembly
procedures are required, the content of this booklet is confined to listing new data,
homologated parts, and to explaining the additional work and preparation necessary for
achieving the best results from the kits. Notes on additional items of equipment and
special processes are given under "Optional Recommendations".

The Workshop Manual, Part No. 511243, retails at £3 3s. Od. and may be obtained
from Standard-Triumph Distributors or Dealers. Parts and Manuals are not obtainable
direct from the factory.

Selection of Modified Parts

The Spitfire model specification in standard tune provides a sports car with outstanding
reliability and performance. It is generally accepted, however, that any
increase in performance in excess of manufacturer's standard specification will result
in increased wear rate and induce additional stresses in all mechanical components,
resulting in a shorter working life. It is suggested, therefore, that owners contemplating
increasing the performance of their models select the simplest form of tune which
meets their requirements.

Conditions of Sales

Standard-Triumph Sales Limited reserve the right to vary, at any time, the prices
quoted. All goods are invoiced at prices current at the time of purchase and do not
include fitting charges.

The descriptions and illustrations appearing in this book are not binding. The
MANUFACTURER, therefore, reserves the right-whilst retaining the basic features
of the Models herein described and illustrated to make at any time, without necessarily
bringing this book up-to-date, any alteration to units, parts or accessories deemed


Copyright Notice
I am sharing this book and not seeking to profit from its distribution. If you have any claim to the book or its contents please let me know. 

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 If you like this may also like the Triumph Herald Spitfire Tuning & Modification book