Bristol 100 B2 engine for sale

Bristol 100 B2 engine for sale

Product Overview

For sale is a genuine Bristol 100 B2 engine with its original matching long-lever gearbox — a complete, original powertrain package that is rare and becoming increasingly difficult to source in this state of completeness. The engine has been professionally crack tested with no cracks found, turns freely, and is in good original condition for its age. It has been stored dry in a workshop throughout, ensuring no deterioration from exposure to damp or the elements.

The package is supplied complete with carburettors and all ancillaries as pictured— an important distinction in the market for Bristol engines, where incomplete examples requiring further parts sourcing are far more commonly encountered than fully assembled units of this kind. The matching long-lever gearbox adds further significance and practical value, making this a substantially ready-to-rebuild or preserve-in-situ powertrain for the right buyer.

Engine & Gearbox Specification

Condition

The engine and gearbox are presented in good original condition appropriate to their age. Specific condition observations are as follows:

• Engine crack tested — a professional crack test has been carried out on the engine block; no cracks were found, providing an important and independently verified baseline for any prospective rebuild
• Turns freely — the engine rotates without resistance, indicating no seized internal components and a positive starting point for assessment and rebuild planning
• Complete with carburettors and ancillaries — the engine is assembled with its carburettors and associated ancillaries in place as shown in the accompanying photographs; nothing has been removed or stripped
• Original long-lever gearbox included — the gearbox is the correct original long-lever type associated with this engine and is presented in good condition
• Dry stored in workshop — continuous dry storage has preserved the unit from the moisture and corrosion associated with outdoor or damp conditions; the cosmetic and structural presentation reflects this

About the Bristol 100 B2 Engine

The Bristol 100 series engine has one of the most distinguished lineages of any British post-war powerplant. Derived directly from the pre-war BMW 328 engine — the rights and technical documentation for which Bristol acquired following the Second World War — the 100 series was developed and refined by Bristol Aeroplane Company’s engineering team and became the foundation of Bristol’s remarkable post-war competition and road car programme.

The 100 B2 is a development within this series, distinguished by its specific internal specification and associated output characteristics. The engine is a two-litre straight-six featuring hemispherical combustion chambers, an unusual and sophisticated cross-pushrod valve actuation system derived from the BMW 328, and a short-stroke configuration that favours a willing, high-revving character well suited to competition use.

Bristol engines of the 100 series found application in Bristol’s own road and competition cars as well as a number of other significant British sporting vehicles of the period. Most notably, the Bristol engine was used by AC Cars in the AC Ace — the car that would later become the AC Cobra — making Bristol 100 series engines an important and sought-after component for AC Ace restoration and period-correct competition builds. The engine was also used in Cooper, Frazer Nash, and various other bespoke competition chassis of the era.

Complete, genuine Bristol 100 B2 engines in the condition described here — with original matching gearbox, crack-tested block, intact ancillaries, and properly stored — are genuinely rare in today’s market. The pool of surviving complete examples is finite and diminishing, and demand from restorers, competitors in eligible historic racing series, and collectors has remained consistently strong.

Ideal For

• Bristol car restoration — 401, 402, 403, 404, 405, 406 and related models requiring a correct 100 B2 engine
• AC Ace restoration and period competition builds — the Bristol engine is the correct and most desirable fitment for AC Ace restoration and historic racing
• Historic motorsport — eligible for a wide range of pre-war-derived and early post-war historic racing categories
• Frazer Nash and Cooper projects — period chassis that accepted the Bristol engine in period use
• Collector and museum acquisition — a complete, original powertrain of significant British automotive heritage
• Preservation — buyers seeking to retain and conserve a complete original unit rather than rebuild it

Purchasing & Enquiries

This Bristol 100 B2 engine and original long-lever gearbox are offered for sale as a complete package. The engine has been crack tested, turns freely, and is complete with carburettors and ancillaries as shown in the photographs. Dry stored and in good original condition for age. Inspection is welcomed and encouraged prior to purchase.