Class 55 55019 Royal Highland Fusilier seen on the Great Central Railway
David
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[quote=“JL_Chicago, post:40, topic:320362”]
Weren’t the Deltics also 2 strokers?[/quote]
Think of them as three FM OP engines sharing crankshafts. They have no valves, no cylinder heads, and exhaust is scavenged from timed inlet ports near one end of the cylinder to timed ports at the other end, rather than through four big mushroom-headed poppet valves as in an EMD 567/645/710.
Key to getting the Deltic in balance: one of the three cranks rotates backward relative to the other two. I have immense regard for the person that figured out to do that. Some of the gear-drive complexity involves arranging this.
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God where have I been the last 67 years! I never knew the 567 had poppet valves like a car engine. I always assumed it used scavenging ports. I googled drawings for both the deltic and the 567. That deltic is both simple and complicated at the same time. Learned something new today. Thanks.
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New York City Fire Department’s “Super Pumper” of the 1960’s and 1970’s had a Napier Deltic (and still does, although it’s in a museum).
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