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Thornycroft enjoys a worldwide reputation as a leading supplier of quality marine diesel engines which are individually marinised in the UK on an ISO 9001 assembly line to ensure the highest quality. All engines are individually run and dynomometer tested before being signed off and packaged for delivery to guarantee the very best in performance. Thornycroft currently marinises Kubota base engines. In the past, Thornycroft built their own engines (till the late 1950’s) and then marinised engines built by AEC, BMC, Ford and much later Cummins and Hino.

History

For well over 150 years the name Thornycroft has been synonymous with the very best in marine engineering, an achievement made possible by the entrepreneurial talents of John Issac Thornycroft as far back as 1859.

Below you can see a print advertisement dated 1953 offering the full Thornycroft range of marine diesel engines at that time.

Thornycroft remained under family ownership until becoming part of AEC/ACV Truck and Bus in 1961. Then in 1962, they becoming part of British Leyland where Thornycroft became the marine engineering division of the group.

Thornycroft was transferred to a British Leyland Subsidiary, Beans Engineering of Tipton in 1972 at which point the plant had over 1000 employees. Upon the breakup of the British Leyland in the 1980’s, Thornycroft was aquired with Beans Engineering as part of a management buyout. However, Reliant Motors who was also part of Beans Engineering proved to be its downfall and Thornycroft was sold off and into private ownership in 1995 where it has continued to manufacture marine engines up to the present day (see Contact Information below for current status).

From Thornycroft.

Thornycroft was a United Kingdom-based vehicle manufacturer which built coaches, buses, and trucks from 1896 until 1977.

John Isaac Thornycroft, the naval engineer, also formed the Thornycroft Steam Carriage and Van Company which built its first steam van in 1896. This was exhibited at The Great Exhibition, and could carry a load of 1 ton. It was fitted with a Thornycroft marine launch-type boiler (Thornycroft announced a new boiler designed for their steam carriages in October 1897). The engine was a twin-cylinder compound engine arranged so that high-pressure steam could be admitted to the low-pressure cylinder to give extra power for hill-climbing.

Thornycroft’s first petrol vehicle was built in 1902, and the company completed the move into internal combustion engine power in 1907. Thereafter the vehicle building firm and the marine side (later to become Vosper Thornycroft) were separate companies.

From 1931, Thornycroft used names for their vehicle range – descriptive and colorful ones. During World War II the company designed the Terrapin and other war-related vehicles.

In 1948, the company name was changed to Transport Equipment (Thornycroft) Ltd to prevent confusion with the shipbuilding Thornycroft company. The company was well known for providing fire-engine chassis, with multi-axle drive for uses such as airports.

They were taken over in 1961 by AEC parent Associated Commercial Vehicles Ltd, and production was limited to Nubians, Big Bens and Antars, although the Thornycroft-designed six-speed constant mesh gearbox was used in AEC and later medium weight Leyland and Albion trucks. ACV was then taken over by Leyland in 1962. They already had a specialist vehicle unit in Scammell, another manufacturer of large haulage vehicles. Thornycroft’s Basingstoke factory was closed in 1969 and specialist vehicles transferred to Scammell at Watford.

From Wikipedia.

Thornycroft stopped building their own engines, RN Series when they closed the engine works in Reading, I think in the late 1950’s. After closure of their own works Thornycroft marinised engines by AEC, BMC, Ford and much later Cummins and Hino.

…the 381 which was a plain old naturally aspirated 6.2 litre Ford Dorset.

Motor is Leyland 0.370 MkII, … 370 designation was rough guide to displacement in Cu inches actually it was 6.054 Litres.

From Classic Boat.

I have a Thornycroft RZ6/180 marine engine about to be fitted in my river tug, that I’d love to find out more about- I bought it to replace the damaged original engine (it came with loads of new spares, so i had it completely rebuilt), but I’ve recently heard from someone interested in Thornycrofts that it might be 125hp, and not the 180hp that i was led to believe when i bought it. This is a problem for me, because I’ve done some sums, and reckon it will struggle to swing my prop if the lower rating is correct. I’ve found very little info on these engines over the past few years, so if anyone has any, I’d be really grateful. Apparently the R means it was built in Reading, Z means marine, and 6 is the number of cylinders.

From Old Marine Engine.

I have a Thornycroft RNR6MV marine engine, 90hp made in 1961.

From Old Marine Engine.

Contact Information

Thornycroft Engines Limited (current vendor of Thornycroft marine engines)
Admin Address:
Thornycroft Office:
Ridge Wharf
Ridge, Dorset, BH20 5BG, UK
Unit F, The Aquarius Centre
Edison Close, Quedgeley, Gloucester GL2 2FN, UK

Telephone:
^ Inside UK: 01929 500603 01452 676563
^ Outside UK: 0044 1929 500603 0044 1452 676563

Website: https://www.thornycroftengines.com/.
Contact Form: https://www.thornycroftengines.com/contact.
Email: info♣thornycroftengines.com (Replace “♥” with “@”)

From Thornycroft/Contact.

Unit F, The Aquarius Centre,, Edison Cl, Quedgeley GL2 2FN, UK is currently occupied by a business called Engines Plus Ltd (www.enginesplus.co.uk) Tel: 01452 729707. This suggests that Engines Plus Ltd and Thornycroft Engines Ltd (www.thornycroftengines.com) are somehow related.

From gMaps.

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Vendor's Offerings

THORNYCROFT MARINE ENGINE MODELS

From Thornycroft.com/Out-of-Production.
From Thornycroft.com/Seagoing-Engine-Models.
From ASAP-Supplies.com.

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Specifications For Thornycroft
4-Stroke Cycle Marine Engines
(Models by Ascending Year/Displacement/Horsepower)

>> Specification Table Under Development <<

TABLE KEY:
Types of Engine Vendors: Engine design owners may produce the engines in-house as manufacturers.
^ Licensees are licensed by engine design owners to produce base engines and/or marine engines.
^ Marinizers buy base engines from the producers at wholesale, marinize them for marine service,
^ ^ and then sell them to boat builders, resellers, etc. at wholesale or to end users at retail.
^ Resellers buy marine engines at wholesale and resell them at a markup including retail.
BASE ENGINE: Manufacturer/Vendor & Model of Base Engine followed by Specifications.
^ CYL: Cylinder Orientation & Configuration - (Dash w/no spaces) Number of Cylinders: (example: "V-8")
^ ^ Cylinder Orientation: v... = Vertical Crankshaft (Pistons are always horizontal).
^ ^ ^ Horizontal Crankshaft: No Code = u… = Upright (Vertical). s… = Slanted (Inclined).
^ ^ ^ h… = Horizontal (Flat, Pancake). i… = Inverted (Crankshaft Up, Head Down, Upside Down).
^ ^ Cylinder Configuration: S = …S = Single Cylinder. I = …I = In-Line. V = …V = V Pattern (eg V-8).
^ ^ ^ …W = W Pattern. …Y = Y Pattern. …X… = X Pattern. …+… = + Pattern. …Δ… = Delta.
^ ^ ^ …o = Outward Facing Pistons (eg Boxer). …i = Inward Facing Opposed Pistons (O-P).
^ ^ ^ …R,R2,R3,R4 = Radial (Single,Double,Triple,Quad Banks). …® = Radial Rotary = Rotary Radial.
^ ^ ^ …Θ… = Rotary. …∞ = BiQuad Rotary. …ω = Wankel Rotary.
^ BORE & STROKE: …mm = Millimeters. …in = …" = Inches.
^ DISPLACEMENT = Swept Volume: …cc = Cubic Centimeters (cm³). …L = Liters. …ci = Cubic Inches (in³).
MODEL RATINGS: Base Engine Model, Vendor Rating Code, Duty Ratings, Power Ratings, etc.
^ A-F: Aspiration-Fueling: Intake Air uncharged or charged - Petrol or Diesel Fueling.
^ ^ Aspiration: N = Naturally Aspirated. T = Turbocharged. TT = Twin Turbos. S = Supercharged.
^ ^ ^ …c = Crankcase Scavenged. …h = Crosshead Scavenged. …b = w/Blower.
^ ^ ^ …i = Intercooled. …a = Aftercooled. …A = Air Cooled Intercooler/Aftercooler (Charged Air Cooler).
^ ^ ^ …R = …r = w/RawWater (Seawater) Cooled Intercooler/Aftercooler (Charged Air Cooler).
^ ^ ^ …F = …f = w/FreshWater (Engine Coolant) Cooled Intercooler/Aftercooler (Charged Air Cooler).
^ ^ Petrol Fueling: C = Carbureted. T = Throttle Body Injection. M = Multiport Injection.
^ ^ ^ D = Direct Injection. …a = Compressed Air Assisted Injection.
^ ^ Diesel Fueling: M = Mechanical Injection. …d = Distributor Injection Pump. …I = In-line Injection Pump.
^ ^ ^ …ii = II = Integral Injector. C = Common Rail. E = …e = Electronic Injection.
^ ^ ^ …d = Direct Injection (into combustion chamber). …i = Indirect Injection (pre-combustion chamber).
^ DR = Duty Ratings: See the Engine Duty Ratings Description at the end of the Table.
^ ^ ♦♦ = Highest Power Rating from Data Sources.
^ ^ C = Continuous (eg Workboats). I = Intermittent (eg Pleasure Craft). M = Max = Maximum.
^ ^ BS = B. S. Rating. OL = B. S. Overload.
^ POWER: kW = Kilowatts. HP = Horsepower. BHP = Brake Horsepower. SHP = SAE Horsepower.
^ ^ sHP = Shaft Horsepower. MHP = Metric Horsepower. PS = Pferdestärke (Metric Horsepower).
^ RPM = Power Ratings @ Revolutions Per Minute.
^ YEARS: Beginning∼Ending. Trailing "–" or "∼" without an Ending Date = Still in Production/Available.
^ ^ YYYY usually = Model Year. MM/YY = actual Month/Year.
^ ^ Vendors typically market products after production ceases, often until stockpiles are exhausted.
^ DS = Data Source: Click DS Link to view DS. ♦♦♦ = Summary of Data Compiled from Multiple Sources.
^ ^ DS's 1st Letter = Vendor's 1st Letter (example: F = Ford). Wik = Wikipedia. BD = BoatDiesel.com.
^ ^ DS's 2nd Letter:  ...d = Directory. ...w = Webpage. ...c = Catalog. ...b = Brochure. ...s = SpecSheet.
^ ^ ^ ...o = Owner's/Operator's Manual. ...m = Service/Repair/Technical/Workshop/Shop Manual.
^ ^ ^ ...p = Parts Catalog. …# = Serial # List ...h = History. ...y = Years Vended (History). ...f = Forum.
^ ^ DS's Last Digits: ...1,2,3,A,B,C,etc = Source #, Version, Revision (example: Fc1 = Ford Catalog #1).
Data: ⊗ = Data Not Available from Data Source. ¿... = ^¿… = ...? = …^? = Data Unconfirmed/in Question.

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HOW TO READ THIS TABLE

Each line displays the data available from the identified Data Source (DS). The data is displayed according to the Table Key above. Clicking on the Data Source Link will open a new window displaying that Data Source. Data Sources include Catalogs, Brochures, Ads, SpecSheets, Owners/OpManuals, Parts Catalogs, Shop Manuals and Articles. The Triple Diamond "♦♦♦" = Summary of data compiled from multiple Data Sources.

Keep in mind that Data can be inaccurate in the source material and sometimes, the source material may be illegible. We try to obtain the best source material available and we make corrections to the tables when needed. If you wish to point out an error or you can help us obtain good source materials, please let us know via email To: Editor♥EverythingAboutBoats.org (Replace "♥" with "@")

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Petrol Engines
Features: Horizontal Crankshaft and Vertical Cylinders

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⇒ Specification Table Under Development ⇐

NOTES:

If you can help us add information, specifications, data sources, etc. that we
lack, please submit the info/links (or attach the PDF) via an email To:
Editor♥EverythingAboutBoats.org (Replace "♥" with "@")

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Diesel Engines
Features: Horizontal Crankshaft and Vertical Cylinders

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⇒ Specification Table Under Development ⇐

NOTES:

If you can help us add information, specifications, data sources, etc. that we
lack, please submit the info/links (or attach the PDF) via an email To:
Editor♥EverythingAboutBoats.org (Replace "♥" with "@")

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Thornycroft
Engine Duty Ratings
DRAFT

Marine:
C = Continuous: Power available continuously - Unlimited hours.
I = Intermittent: Power for <1 out of 8 hours (remainder at <75% power) - Annual hours <1000.

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FORD
Engine Duty Ratings

Agricultural:
A = Agricultural
AP = Agricultural - Pto (Power Takeoff)
M = Maximum

Automotive:
CM = Continuous Maximum
LV = Light Vehicle (Cars & Vans)

Industrial:
BS = B.S. = British Standards
C = Continuous: Power available continuously - Unlimited hours.
CA = Continuous A: Power available continuously - Unlimited hours. (DIN 6270)
CB = Continuous B: Power available continuously - Unlimited hours. (DIN 6270)
I = Intermittent: Power for <1 out of 8 hours (remainder at <75% power) - Annual hours <1000.
OL = Overload*: Fuel injection rack at maximum fuel duration (Very Intermittent).

Marine:
80% = Rating @ 80% Power: Continuous.
100% = Rating @ 100% Power: Intermittent.
C = Continuous: Power available continuously - Unlimited hours.
I = Intermittent: Power for <1 out of 8 hours (remainder at <75% power) - Annual hours <1000.
M = Maximum Power Output

Power Generation:
C = Continuous: Power available continuously - Unlimited hours.
I = Intermittent: Power for <1 out of 8 hours (remainder at <75% power) - Annual hours <1000.
G = Generator
P = Generator Intermittent Peak Load

*The "OL = Overload" Duty Rating power output is achieved by these diesel engines only when the fuel injection control (the "rack" in most "Jerk" type fuel injection pumps) reaches maximum fuel duration and the engine is under heavy load. This "overload" power output is intended to be reached only occasionally for short duration situations such as when accelerating, as it results in over-fueling (a fuel rich mixture) that will cause rapid carbonization which in turn will severely shorten the service life of the engine. Therefore, it is recommended that the engine, gearing, propeller, etc. be set up so the fuel injection control will back off to a position that will provide the best ratio of fuel to air during sustained operation in order to achieve a long engine service life. Far too often, diesel marine engines are poorly matched to the watercraft by the builder and/or are over-propped with too much pitch, forcing them to suffer the serious consequences of over-fueling. See our article on Selecting the right diesel engine to discover a vital component that most all diesel engines lack, but almost every gasoline engine is equipped with.

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The MAIN TOPICS (all Caps) below are followed by their Main Subtopics with Links.

00 – HOME: CONTENTS, ABOUT EAB: Contact EAB, Abbreviations & Symbols, FAQ, GLOSSARY, ADs,+.
01 – ABOUT BOATS w/Museum Directory: Early History, Recent History, Modern Vessel Types,+.
02 – BOAT BUILDING, OUTFITTING, REFITTING & REPAIR: Materials, Equipment, Builders,+.
03 – BOAT MARKETING: Boat Shows, Dealers & Brokers, Importing & Exporting, Auctions & Sales,+.
04 – BOAT INSPECTION: Types of Marine Surveys, Marine Surveyors, Schools, DIY Inspections,+.
05 – BOAT TITLES & VESSEL REGISTRY: Boat Title & Registration, Vessel Registry, Title Co's,+.
06 – BOAT FINANCING: Conventional (Banks, Credit Unions,+), Unconventional (Creative),+.
07 – BOAT INSURANCE: Maritime & Recreational: Coverage, Carriers, Agents,+., Claim Processing,+.
08 – BOAT TRANSPORT: By Sea (Piggyback, Delivery Skippers & Crews, & Towing), Over-Land,+.
09 – BOAT HAULING & LAUNCHING: Drydocks, Ways, Lifts, Cranes & Hoists, Launch Ramps,+.
10 – BOAT MOORAGE & STORAGE: Builders, Anchorages, Marinas, Yards, Racks & Stacks,+.
11 – BOATING ORGANIZATIONS: Yacht Clubs & Sailing Clubs, Paddling Clubs, Boat Owners,+.
12 – BOATING & TRAVEL: Events, Destinations, Boat Rentals & Charters, Cruises, Voyages,+.
13 – BOATING & MARITIME EDUCATION: Recreational Seamanship, Ship's Master & Crew,+.
14 – MARINE LAWS & REGULATIONS: International & National Laws‚ Lawyers‚ Investigators‚+.
15 – DO-IT-YOURSELF: DIY Boat Building & Repair, DIY Boat Sales, DIY Boat Surveys, DIY Classes,+.
16 – MEDIA w/Creator Directory + Academy eLibrary: pDocs, Books, Magazines, Videos, Websites,+.

The above MAIN TOPICS and a more detailed listing of Subtopics
can be found on the Website Contents page and on the Right Sidebar.
An Alphabetical Index of the website can be accessed at Website Index.

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What we have accomplished so far.
Anchors Aweigh Academy and its EverythingAboutBoats.org website.

• Published over 50,000 website pages about boats and boating, bringing us closer to reaching our goal of becoming "The ultimate reference resource about boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner!"
• Published over 300 website main topic webpages, many with full articles on the topic. See our Website Contents or the Right Sidebar for the listing of the main topic pages.
• Published over 9,000 marine vendor webpages, all with their contact information, most with a description of their products and services, many with product documentation, specifications and independent reviews. (incl.: Boat designers, boat building tools, material and equipment manufacturers and suppliers, boat builders and dealers, yacht brokers, marine surveyors, boat insurers, boat transporters, skippers and crews, boatyards and marinas, yacht clubs, boat rentals and yacht charters, boating, seamanship and maritime schools, marine law attorneys and expert witnesses, boat refitters and repairers, book authors, magazine publishers, video producers, and website creators)
• Acquired over 120,000 pages of product documentation including Catalogs, Brochures, SpecSheets, Pictures, Serial Number Guides, Installation Manuals, OpManuals, Parts Catalogs, Parts Bulletins, Shop Manuals, Wiring Diagrams, Service Bulletins, and Recalls. And have made all viewable to Academy Members through our EAB website eLibrary.
• Acquired over 1,200 books and magazine back issues in our academy library and so far have made over 700 viewable to Academy Members through our EAB website eLibrary.
• Published over 500 DIY How-To articles about boat design, construction, inspection, operation, maintenance, troubleshooting and repair. We are working hard to do more.

We are currently formatting and polishing the Anchors Aweigh Academy online and hands-on courses. Our Marine Surveying course has proven to be excellent for both the beginner and the seasoned surveyor, and especially helpful to the Do-It-Yourselfer.

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Current Academy Members must SIGN IN to gain FULL access to this
website including expanded pages and valuable Academy programs
like our Academy eLibrary and our Ask-An-Expert Program!
If your membership has expired, CLICK HERE to Renew.

IF YOU ARE NOT YET AN ANCHORS AWEIGH ACADEMY MEMBER,
CLICK HERE to discover how you can become a Member and gain FULL access to
thousands of expanded pages and articles, and dozens of excellent programs
WITH JUST A SMALL DONATION!

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Comments for Public Viewing

Submit any comments for public viewing via email To: Comments♥EverthingAboutBoats.org (Replace "♥" with "@")
Please remember to put this webpage's title in the subject line of your email.
All comments are moderated before they appear on this page. See Comment Rules.

General Comments About the Website

FROM Donald: "This is an awesome website. I found the information that I needed right away from one of the over 20,000 free articles that you provide as a public service. I'm surprised that so much if this site is free. But I still signed up so I could access the thousands of expanded pages, interesting articles, and dozens of valuable programs! The member's library of books, magazines and videos that I can view online is really terrific! I understand that you and your staff are all unpaid volunteers. Please keep up the good work. And I commend you for your plans to add another 10,000 free informative articles over the next year. I'm thrilled to support you in this endeavor with my small membership donation. Thanks again for all your hard work."

FROM Huey: "I agree with my Uncle, I too have found the articles to be very enlightening. They say that it will take about 100,000 articles to cover the full scope that they have envisioned for the website. They have over 20,000 articles so far and that's doing pretty well, but it could take several years to get the rest. I also noticed that many of the Main Topic Pages and some of the article pages are still in the rough draft stage. I guess that they will fill in as they can get volunteers to work on them. But what I can't figure out is why anyone would spend the time writing informative in depth articles just to give away free to this website for publication? What's in it for them?"

FROM Dewey: "Well Huey, to me It looks like most of the articles on this website are written by very informed people, like boating instructors, boat designers, boat builders, riggers, electricians, fitters, marine repair technicians and marine surveyors. Writing such articles helps establish them as knowledgeable professionals. After all, this website was originally created by a school for marine technicians and marine surveyors. The website is growing in content every day. They even had to move to a bigger, more powerful server because the website's traffic has been growing exponentially."

FROM Louie: "I agree with everyone above. This site is quickly becoming the ultimate reference resource about every aspect of boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner. I use the topic pages on the right sidebar to browse around the website. It's like a Junior Woodchucks' Guidebook for Boaters. Their Members' Library of over 300 popular and obscure books and over 200 magazine back issues that can be viewed online is fabulous. The Academy's magazine is especially informative. On top of that, there is the "Ask-An-Expert program for members where you can get an expert's answer to any of your boat questions. And a whole years membership is only $25. What a deal! I really love being part of this "Everything About Boats" community and help provide thousands of helpful articles free to the public. I think that I'll sit down right now and write an article about my experiences boating with my uncle."

FROM Scrooge: "You rave about this website like it was the best thing since sliced bread. Well, I think it stinks. Sure, it has a lot of good information for boaters, and they're adding more every day, but it will probably never be finished. Furthermore, I don't even own a boat. And I wouldn't have a boat even if someone gave me one. Boats are a waste of money and time and energy and money! They're just a hole in the water you pour money into. If you gave me a boat, I'd sell it quicker then you could say Baggywrinkle. Then I'd lock up the cash with all my other money so I could keep my eye on it and count it every day. Bah humbug."

FROM Daisy: "I'm just so glad that Donald got the boat so we and the boys could enjoy boating — together. And of course all of the girls, April, May, and June, love to be on the water too, especially when that is where the boys are. Oh poor Scrooge, boating is more fun then you could possibly imagine."

FROM Scrooge: "After seeing how much fun you all have on the water together, I regret that I didn't have that much fun when I was young. I've had a change of heart, and I'm giving each of you a Lifetime Academy Membership."

FROM Editor: "For those of you that have stayed with us this far, many thanks, and we hope that you found this little narrative informative. Your faithful support inspires us to keep working on this phenomenal website. We know that we have a lot more to do. Ultimately, we hope that we can help you enjoy the wonder filled world of boating as much as we do. We are all waiting to see what you have to say about this webpage article. Submit any comments via email To: Comments♥EverythingAboutBoats.org (Replace "♥" with "@"). Be sure to include this page's title in the subject line. Also, your corrections, updates, additions and suggestions are welcomed. Please submit them via email To: Editor♥EverythingAboutBoats.org (Replace "♥" with "@"). It has been truly amazing to see what we have been able to accomplished when we've worked together. Thanks to all those that have donated their valuable time and energy, and a special THANK YOU to all that have supported this cause with their membership donations."

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