Wright R-2600 Cyclone 14 Aircraft Engine Manuals Collection

A comprehensive digital archive of 17 original technical manuals covering the Wright R-2600 Cyclone 14 (Twin Cyclone) — the legendary 14-cylinder radial engine that powered some of the most iconic Allied aircraft of World War II, including the North American B-25 Mitchell, the Grumman TBF Avenger, and the Douglas A-20 Havoc.

Developed by Wright Aeronautical Corporation (a division of Curtiss-Wright) and first certified in 1937, the R-2600 produced between 1,500 and 1,900 hp across its variants and was built in excess of 85,000 units — making it one of the most produced Allied aero engines of the war. Today, airworthy examples continue to fly in restored B-25 Mitchells and TBF/TBM Avengers on the warbird circuit worldwide.

This collection spans overhaul instructions, service manuals, parts catalogs, maintenance manuals, operator handbooks, and tables of limits — sourced from original military and manufacturer publications dating from 1940 to 1945.

Manuals Included (17 Documents)

• Handbook of Overhaul Instructions — R-2600-7, -8, -9 and -13 Aircraft Engines — Technical Order No. 02-35HB-3 — RESTRICTED — July 10, 1942 / Revised 12-10-42
• Handbook of Overhaul Instructions — Model R-2600-11 Engine and Associated Models (R-2600-3, -11, -19, -23 and -25) — Technical Order No. 02-35HA-3 — RESTRICTED — June 5, 1942 / Revised 8-10-42 — Wright Aeronautical Corp., Paterson, N.J.
• Parts Catalog — Aircraft Engines — Models R-2600-20 and -22 — AN 02-35HC — RESTRICTED — 5 January 1945
• Handbook of Service Instructions — Aircraft Engines — Models R-2600-20 and -22 — AN 02-35HC-2 — RESTRICTED — 15 August 1945
• Final Spare Parts Catalog with Prices — Wright Cyclone 14 Engines — Models R-2600-8 & -8A — NAVAER 02-35HS-4 — Catalog Part No. 853312 — RESTRICTED — September 15, 1942
• Parts Catalog — Aircraft Engines — Models R-2600-8, -8A, -12, -13, -20, -22, -29 and -31 — AN 02-35H-4 — RESTRICTED — 15 June 1945
• Instructions for the Installation, Operation and Maintenance of the Wright Cyclone 14 Aircraft Engine — Model C14A — Second Edition — Wright Aeronautical Corporation, Paterson, New Jersey — August 1940
• Instructions for the Installation, Operation and Maintenance of the Wright Cyclone 14 Aircraft Engine — Model C14B — Second Edition — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation, Paterson, New Jersey — June 1942
• Parts Reference Charts — Wright Aircraft Engines — Cyclone 14BA — Part No. 854877 — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation — March 1944
• Overhaul Manual — Wright Cyclone 14 Aircraft Engines — Series A — Second Edition — Part No. 112424-N2 — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation — May 1943
• Service Manual — Wright Cyclone 14BB Aircraft Engines — RESTRICTED — Second Edition, First Printing — Part No. 120512-N2 — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation — November 1943
• Overhaul Manual for the Wright Cyclone 14 Aircraft Engine — Models C14A & C14B — First Edition — Wright Aeronautical Corporation, Paterson, New Jersey — November 1940
• Table of Limits — Wright Aircraft Engines — Cyclone 14BA — Part No. 855569 — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation
• Table of Limits — Wright Aircraft Engines — Cyclone 14BB — RESTRICTED — Part No. 854004N2 — Wright Aeronautical Corporation, A Division of Curtiss-Wright Corporation
• Handbook of Operation and Flight Instructions — Model R-2600-11 Engine and Associated Models (R-2600-3, -11, -19, -23 & -25) — Technical Order No. 02-35HA-1 — RESTRICTED — June 20, 1942
• Handbook of Service Instructions — Model R-2600-9 Engine and Associated Models (R-2600-7, -8, -9 and -13) — Technical Order No. 02-35HB-2 — RESTRICTED — June 10, 1942 / Revised 9-15-42
• Handbook of Operating Instructions — R-2600-8, -9 and -13 Aircraft Engines — Technical Order No. 02-35HB-1 — RESTRICTED — March 25, 1943

Engine Technical Specifications

• Type: 2-Row Radial, air-cooled, reciprocating
• Cylinders: 14 (two rows of seven)
• Displacement: 2,604 cu in (42.7 litres)
• Horsepower: 1,500–1,900 hp (variant dependent)
• Bore × Stroke: 6.125 in × 6.3125 in (155.6 mm × 160.3 mm)
• Compression Ratio: 6.9:1
• Weight: approx. 1,980–2,045 lbs
• Fuel: 100 octane (90–95 octane on early models)
• Supercharger: Two-speed single-stage centrifugal with hydraulic clutch
• Carburetor: Stromberg downdraft
• Exhaust Valves: Sodium-cooled

Key Variants Covered

• R-2600-3: Early 1,600 hp version
• R-2600-8 / -8A: Widely used in B-25 Mitchells and SB2C Helldivers, 1,700 hp
• R-2600-9 / -13: TBF Avengers and A-20 Havocs, 1,700 hp
• R-2600-20 / -22: High-power variant, 1,700–1,900 hp
• C14A / C14B / C14BA / C14BB: Manufacturer designation series covering civilian and military production variants

Historical Context

Introduced in 1937 and produced through January 1946, the R-2600 was a true workhorse of the Allied air war. It powered the B-25 Mitchells of the Doolittle Raid (April 1942), flew anti-submarine patrols in TBF Avengers from carrier decks, and drove the Douglas A-20 Havoc in low-level attack missions across every theater. Over 85,000 units were built — approximately 76,488 military and 8,821 commercial — making it one of the most significant radial engines of the era.

Today, airworthy R-2600s continue to operate under active FAA Airworthiness Directives covering cylinder inspections and hub assemblies, and can be seen and heard at warbird airshows worldwide in restored B-25s and Avengers.

Aircraft Applications

Military: North American B-25 Mitchell · Grumman TBF/TBM Avenger · Douglas A-20 Havoc/Boston · Curtiss SB2C Helldiver · Martin PBM Mariner · Vultee A-31/A-35 Vengeance

Civilian: Boeing 314 Clipper · Boeing 307 Stratoliner

Format & Delivery

• 📄 Format: PDF (high-resolution scans of original documents)
• 📦 Delivery: Instant digital download — files are delivered as a compressed archive (RAR/ZIP)
• 🔓 To open your files: Extract the archive using a free tool such as WinRAR or 7-Zip (Windows) or The Unarchiver (Mac). Once extracted, all files open as standard PDFs.
• ♾️ Access: Lifetime access with free updates if additional documents are added to this collection
• 🚫 No physical item is shipped