Atlas-Imperial Engine Co

Atlas-Imperial model numbers are a combination of four different designations: cylinder number, block type, application, and cylinder volume. Block types were either "H" heavy-duty engines with individual cylinders and heads; or "E" en-block engines with a solid block and individual heads. Application could be "M" (marine), "S" (stationary), or "N" (industrial). Cylinder volume is the cubic volume in inches of a single cylinder. For example, a 4HM763 Atlas-Imperial is a marine heavy-duty diesel with four cylinders and a volume of 763 cubic inches per cylinder.

Known Remaining engines

Click on the headings to sort table by column. Names struck out designate an engine's original provenance prior to removal for display.
Model Serial Engine Bore Stroke Cyl HP RPM Owner Originally Currently Location
6HM2124 Alpo 13" 16" 6 400 260 Sami tugboat tugboat Oulu, Finland
4HM464 Ilwaco Fishboat 7½" 10½" 4 70 400 Wayne Thackery fishboat display Brooks, OR
6HM681 Arcturus 8½" 12" 6 140 325 Keith Tollett survey yacht Eureka, CA
4HM282 Arro 6½" 8½" 4 60 600 Keith Benson yacht yacht Vashon Island, WA
4HM282 BC 4HM282 6½" 8½" 3 45 600 marine British Columbia
6HM464SC Bee 7½" 10½" 6 120 400 tugboat yacht Ketchikan, AK
6HS2124 Big Swan Pump 13" 16" 6 400 300 Big Swan Drainage and Levee District marine drainage pump Winchester, IL
3HM464 Bob's 3HM464 7½" 10½" 3 50 400 Bob Helm marine display Pomona, CA
6EM327 Furnace Creek Engine 7½" 8½" 6 120 600 The Borax Museum display Death Valley, CA
3HM763 Brady's 3HM763 9" 12" 3 75 325 Brady Ferguson display Clinton, WA
4HM763 Brady's 4HM763 9" 12" 4 110 325 Brady Ferguson display Clinton, WA
4HM282 Buster 6½" 8½" 4 60 600 Stuart Marshall tugboat yacht Lopez Island, WA
3HM1021 Clyde's 3HM1021 10" 13" 3 100 325 Mark Utlaut Scappoose, OR
3HM763 Clyde's 3HM763 9" 12" 3 75 325 Mark Utlaut Scappoose, OR
3HM681 9598 Argo 8½" 12" 3 65 325 Columbia River Maritime Museum fishboat display Astoria, OR
2HM282 Dave's 2HM282 6½" 8½" 2 30 600 Dave Milholland marine display Anacortes, WA
3HM282 Dave's 3HM282 6½" 8½" 3 45 600 Dave Milholland marine display Anacortes, WA
4HM282 Dave's 4HM282 6½" 8½" 4 60 600 Dave Milholland marine display Anacortes, WA
3HM282 11152 Dunlin 6½" 8½" 3 45 600 Chug Leede tugboat yacht Seattle, WA
6ES668 Junkyard Crane 9" 10½" 6 240 600 Hendrik Ido Ambacht Junkyard crane crane Hendrik Ido Ambacht, Netherlands
6HM1558 Elise Ann Conners 11½" 15" 6 300 300 Gary Matthews tugboat liveaboard Kingston, NY
4HM763 Elmore 9" 12" 4 110 325 Dee Meeks tugboat yacht Port Hadlock, WA
6HM2124 Ever 13" 16" 6 400 300 National Museum of American History tugboat display Washington, D.C.
6ES668 Fairhaven Shipyard Crane 9" 10½" 6 240 600 Fairhaven Shipyard crane crane Bellingham, WA
6HM3358 Flywheelers' 6HM3358 15" 19" 6 600 300 Florida Flywheelers Antique Engine Club display Ft. Meade, FL
6EN668 Fred's 6EN668 9" 10½" 6 240 600 Fred Dorfeld crane Custer, WA
45M5X8 Gowanus Bay 9" 10½" 8 600 720 Jessica Dulong tugboat tugboat Kingston, NY
3HM681 Harbor History Museum 8½" 12" 3 65 325 Harbor History Museum marine museum display Gig Harbor, WA
45M5X8 Hoga (YT-146) 9" 10½" 8 600 720 Arkansas Inland Maritime Museum tugboat museum vessel Little Rock, AR
45M5X8 Hudson 9" 10½" 8 600 720 tugboat St. Croix
Intrepid 9" 10½" James Waltz tugboat yacht Everett, WA
6HM1021 Inverness 10" 13" 6 200 325 Dick Lavers tugboat yacht Seattle, WA
4HM1125 Irene 10½" 13" 4 155 350 Marshall Hibnes tugboat yacht Seattle, WA
4HS763 Jeremy's 4HS763 9" 12" 4 110 325 Jeremy Weiks generator display Tumwater, WA
4HM1021 Jim's 4HM1021 10" 13" 4 135 325 Jim Walsh display Fallon, NV
6HM2124 11811 John Arthur 13" 16" 6 400 300 George Coates tugboat yacht Chesapeake City, MD
3HM1021 Kittie B 10" 13" 3 100 325 David Baxter tugboat yacht Orcas Island, WA
3HS282 Duryea Ice Plant 1 6½" 8½" 3 55 600 Long Island Antique Power Association compressor display Riverhead, NY
45MX Columbia 9" 10½" 8 600 720 Columbia River Maritime Museum lightship museum vessel Astoria, OR
45-MX Relief 9" 10½" 8 600 720 US Lighthouse Society lightship museum vessel Oakland, CA
4HM282 Mark's 4HM282 6½" 8½" 4 60 600 Mark Utlaut marine display Scappoose, OR
6HM2124 Merikarhu 13" 16" 6 400 300 tugboat Finland
3HM763 Mike's 3HM763 9" 12" 3 75 325 Mike Perry display Portland, OR
6ES668 NASA Genset 9" 10½" 6 200 514 generator in storage Florida
6EN668 Navy Cranebarge 9" 10½" 6 240 600 US Navy crane crane Honolulu, HI
4HM763 8390 Newt 9" 12" 4 110 325 Erik Rasmussen & Laura Phillips tugboat liveaboard Seattle, WA
8003 Smithsonian 1 9" 12" 3 55 320 National Museum of American History marine display Washington, D.C.
45M5X8 Smithsonian 3 9" 10½" 8 600 720 National Museum of American History display Washington, D.C.
6HM2124 Normandea 13" 16" 6 400 300 tugboat Finland
6HM1125 Pacific Sunrise 10½" 13" 6 250 360 Mark McCaffrey fishboat yacht Everett, WA
6ES668 Pago Pago Cranebarge 9" 10½" 6 240 600 Pago Pago Shipyard crane crane Pago Pago, Samoa
6HM1558 Palomar 11½" 15" 6 300 300 Dave Haizlip tugboat yacht East Sound, WA
6HM2124 Poitsila 13" 16" 6 300 300 tugboat Finland
6HM1021 PSATMA's 6HM1021 10" 13" 6 200 325 Puget Sound Antique Tractor & Machinery Association marine museum display Lynden, WA
6HM1021 Quail 10" 13" 6 200 325 Rollie Culbertson cannery tender yacht Anacortes, WA
4HM1021 Raven 10" 13" 4 135 325 Ron Brazell tugboat display Point Richmond, CA
6HM2124 11814 Ready 13" 16" 6 400 300 Tim Tawny tugboat display Long Beach, CA
6ES668 20680 Redding Genset 9" 10½" 6 200 514 Rocky generator generator Redding, CA
6HM1558 Rival 11½" 15" 6 300 300 Vista Antique Gas & Steam Engine Museum garbage scow display San Diego, CA
4HM528 Vigorous II 8" 10½" 4 85 450 Ron Brazell yacht display Vallejo, CA
4HM528 22067 Delta Ferryboat 8" 10½" 4 85 450 Ron Brazell ferryboat display Vallejo, CA
3HS282 Duryea Ice Plant 2 6½" 8½" 3 55 600 Rough & Tumble Engineers Historical Association compressor display East Kinzers, PA
6HM464 Sobre las Olas (port) 7½" 10½" 6 120 400 Sean Connoly & Jeff Grates yacht yacht Long Beach, CA
6HM464 Sobre las Olas (starboard) 7½" 10½" 6 120 400 Sean Connoly & Jeff Grates yacht yacht Long Beach, CA
6HM2124 Driftwood 13" 16" 6 400 300 M/V Songhee tugboat charter Port McNeill, BC
4HM282 Spike's 4HM282 6½" 8½" 4 60 600 Spike Blaine display Na'alehu, HI
4HM1125 Voyager 10½" 13" 4 155 350 South Seattle Community College marine display Seattle, WA
45MX ST-2130 9" 10½" 8 600 720 Bruce Morelan tugboat yacht Westport, WA
6HM763 Sultana 9" 12" 6 160 325 LaVern Beier cannery tender charter Juneau, AK
6HM1021 Taconite (port) 10" 13" 6 200 325 Taconite Classic Yacht Charters yacht charter North Vancouver, BC
6HM1021 Taconite (starboard) 10" 13" 6 200 325 Taconite Classic Yacht Charters yacht charter North Vancouver, BC
3HM763 Telegraph Cove 9" 12" 3 75 325 Telegraph Cove Lodge generator display British Columbia
6HM1558 Thea Foss (starboard) 11½" 15" 6 275 275 Foss Maritime Company yacht yacht Seattle, WA
6HM1558 Thea Foss (port) 11½" 15" 6 275 275 Foss Maritime Company yacht yacht Seattle, WA
6HM2124 Tolvan 13" 16" 6 400 300 tugboat Finland
4HS282 TSGA's Engine 6½" 8½" 4 70 650 Tuckahoe Steam & Gas Association display Easton, MD
3HM282 9383 Danny's 3HM282 6½" 8½" 3 65 Danny Felterman display
3HS282 RMP's 3HS282 6½" 8½" 3 65 Roots of Motive Power display
6HS2124 12916 SSM's 6HS2124 6½" 8½" 6 400 900 SABESP Sanitation Museum display São Paulo, Brazil
4HM1021 J.R.'s 4HM1021 10" 13" 4 135 325 J.R. Smith Texas
Unknown tractor "caterpillar" 10" 13" 4 tractor "caterpillar"
Mystic Seaport 10" 13" 4 135 325 Mystic Seaport
Eureka Mining Company 10" 13" 6 Eureka Mining Company Barron, WA
10843 Ron's Gas Engine 6½" 8½" 6 80 Ron Brazel Vallejo, CA
6HM1558 Urger 11½" 15" 6 300 300 New York Canal Corporation tugboat museum vessel Waterford, NY
6EH253 12743 Vagabundo 6¼" 8¼" 6 135 900 Jerry & Tanya motor-sailer yacht Seattle, WA
6HM3358 Velero IV 15" 19" 6 600 300 Velero IV Charters LLC research research Seattle, WA
6ES668 Vietnam Cranebarge 1 9" 10½" 6 240 600 crane crane Ho Chi Minh City, Vietnam
6ES668 Vietnam Cranebarge 2 9" 10½" 6 240 600 crane crane Ho Chi Minh City, Vietnam
4HM1125 Vivian 10½" 13" 4 155 350 Douglas Peckman fishboat yacht Friday Harbor, WA
4HM763 Wakefield Cannery 9" 12" 4 110 325 derelict Port Wakefield, AK
4HS763 Waterfall #1 9" 12" 4 120 400 Waterfall Cannery Resort generator generator Craig, AK
4HS1125 Waterfall #2 10½" 13" 4 160 350 Waterfall Cannery Resort generator generator Craig, AK
4HS1125 Waterfall #3 10½" 13" 4 160 350 Waterfall Cannery Resort generator generator Craig, AK
4HM763 Westward 9" 12" 4 110 325 Bill Baily yacht yacht Seattle, WA
6HM1558 Yellowfin (starboard) 11½" 15" 6 320 325 Pacific Yellowfin Charters freighter yacht Vancouver, BC
6HM1558 Yellowfin (port) 11½" 15" 6 320 325 Pacific Yellowfin Charters freighter yacht Vancouver, BC