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{{Use dmy dates|date=December 2016}}
{{Use British English|date=December 2016}}
{{Infobox UK Bus
| background =
}}▼
| name = Bristol MW
[[File:Bristol Greyhound FHW 154D 2.JPG|thumb|MW with typical ECW coach bodywork]]▼
| image = Warminster - Bristol 2514 536JHU.JPG
| caption = A Bristol MW with [[Eastern Coach Works]] bodywork
| factory =
| replaced = [[Bristol LS]]
| capacity =
| length = {{convert|30|ft|m|abbr=on}}
| width = {{convert|8|ft|m|abbr=on}}
| height =
| floortype = Step entrance
| doors = 1
| weight =
| chassis =
| engine = [[L Gardner & Sons|Gardner]]
| powerout =
| transmission = }}
The '''Bristol MW''' (MW stands for "Medium Weight") is a bus and coach chassis.<ref
|year=1963▼
|title=The First Fifty Years The Story of the Birth and Development of Bristol Vehicles▼
▲ |publisher=Bristol Commercial Vehicles
==Design and construction==
▲ p53, p129 LS with AEC engine</ref> engines and the later [[Bristol RE|RE]] experimentally using a horizontal and turbocharged version of Bristol’s own BVW engine, all MW chassis were fitted with [[L. Gardner and Sons|Gardner]] 5HLW (5-cylinder) or 6HLW (6-cylinder) engines.<ref >(1963). ''The First Fifty Years The Story of the Birth and Development of Bristol Vehicles''. Bristol Commercial Vehicles Ltd. Page 7</ref> The chassis type designation was either MW5G or MW6G. These engines were deep in their horizontal form causing the floor height of the finished vehicle to be high, resulting in steep steps at the entrance. The transmission was by way of a manual 5-forward speed gearbox made by the company. It incorporated synchromesh cones, but these did not wear well and gear changing still required drivers to adjust engine to road speed. The rear axle was available in three ratios 5:1, 5.5:1 and 6:1. 5.5:1 was by far the most popular and 6:1 was the standard for bus versions built for [[Bristol Omnibus Company|Bristol Omnibus Company Ltd.]]
The vehicle was built to the contemporaneous legal maximum limits of size, namely {{convert|8|ft|m|abbr=on|adj=mid|wide}} and {{convert|30|ft|m|abbr=on|adj=mid|long}}. When regulations allowed longer ({{convert|36|ft|m|abbr=on|disp=
▲[[File:Bristol Greyhound FHW 154D 2.JPG|thumb|MW with
There were some options for this chassis introduced later in production to improve fuel consumption and vehicle heating. This included the replacement of the underfloor radiator and its constantly engine driven fan by a front
A total of 1, ==Sanctions==
Production of chassis was authorised by the Board of Directors of BCV in tranches by type, known as "sanctions". Each vehicle received a cast number plate which was bolted to the chassis in the form "135.001" being the first vehicle of the 135 sanction. This number was not always the same as the "build number" allocated by production control and not used after the chassis left the factory.
The sanctions for MW chassis are summarised below. The details are taken from lists compiled from Bristol Commercial Vehicles records showing the customer, fleet number, registration mark for every chassis made and dates constructed and cross checked with individual fleet operators fleet lists.
*'''135'''
*'''139''' – 300 vehicles built April 1958 – April 1959
*'''152''' – 200 vehicles built April 1959
*'''164''' – 200 vehicles built January 1960 – December 1960
*'''184'''
*'''195'''
*'''204'''
*'''213'''
*'''225''' –
*'''233''' – 165 vehicles built 1966 to December 1966
==References==
{{Commons cat|Bristol MW}}▼
{{Reflist}}
===Bibliography===
*{{Cite book
[[Category:Bristol buses|MW]]▼
▲ |year=1963
▲ |title=The First Fifty Years The Story of the Birth and Development of Bristol Vehicles
|author=Bristol
|publisher=Bristol Commercial Vehicles
▲ }}
*{{Cite book
|first1=Martin |last1=Curtis
|first2=Mike |last2=Walker
|year=2007
|title=Bristol Omnibus Services – The Green Years
|publisher=Millstream Books
|isbn=978-0-948975-80-6
}}
==External links==
{{commons category-inline|Bristol MW}}
▲[[Category:Bristol Commercial Vehicles buses|MW]]
[[Category:Bus chassis]]
[[Category:Vehicles introduced in 1956]]
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