V-8 ENGINES

V-8 ENGINES

ABSTRACT

A V8 engine is a V-engine with eight cylinders. The V8 is a very common configuration for large automobile engines. V8 engines are rarely less than 3 litres in displacement and in automobile use have gone up to 8.5 litres or so. American cars until the mid 1970s almost universally had V8 engines, and many still insist on them.

The normal V-angle for a V8 is 90°. There are two classic types of V8s, which differ by crankshaft.

The cross-plane V8 is the typical V8 configuration used in American road cars. Each crank pin (of four) is at a 90° angle from the previous, so that viewed from the end the crankshaft forms a cross. The cross plane can achieve very good balance but requires heavy counterweights on the crankshaft. This makes the cross-plane V8 a slow-revving engine that cannot speed up or slow down very quickly compared to other designs, because of the greater rotating mass.

The flat-plane V8 design has crank pins at 180°. They are imperfectly balanced and thus produce severe vibrations. As they don't require counterweights, the crankshaft has less mass and thus inertia, allowing higher RPM and quicker acceleration.
Theyre mainly used as racing engines, the most famous example being the Ford-Cosworth DFV.

The Coventry-Climax 1.5 litre V8 evolved from a cross-plane configuration to a flat-plane configuration in its latest versions.

INTRODUCTION

1.1 General Information V8 engines, what to expect

The following information regarding O/E engine specs and capacity, is for those that have asked, As well as for those that did not ask, but felt they needed to know.

3.5. =89.5mm bore Std 3.5 crank
3.9. =94mm bore Std 3.5 stroke crank
4.2. =94mm (3.9 bore ) plus and 4.2 longer stroke crank
4.0 is the same capacity as 3.9 but uses later big journal crank and is cross bolted
4.6. + 94mm bore (As per - 3.9 & 4.0) but uses later big journal (long stroke) crank and is also cross bolted as is 4.0.

Stage 1, Stage 3, as above and 4.8, 4.9, 5.2 big capacity big strength upgrades are 'Specials', & are available only & exclusively from / through us.

Whilst we realize, others, may try to copy our V8 Engine’s, highest specifications’, & us
Be assured 20 years of V8's and all they have to offer & have been fitted to, This can never be duplicated overnight or short term, by the 'now' so many 'free loader' and 'discounted suppliers’. We strive to offer, (whilst & wherever possible) without compromise, First class 'Phone, mail and web based assistance' at all times, and we like to think, A second to none service. Backed up with an un-equaled, many years of diverse, and day to day Rover V8 experience to call upon.

For Land Rover's, Range Rover's, Discoveries, TVR's, TR8's, MGB's, Morgan’s, SD1's Marcos's, Cobras's, Westfields, Dax's, other Kit car and custom cars, Trikes, Planes & more !!!..

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