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TOPIC: Living the Past

Living the Past 11 Jul 2020 17:57 #32741

Chappa Online Platinum Boarder Posts: 441 Thank you received: 39	Hey Phil couple of questions 1. Did the top and bottom pistons have the same stroke? 2. What are the top yokes and cross heads like I’m picturing slots in the block but not sure? 3. Are the top piston conrods captained within a crankcase or exposed
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Living the Past 11 Jul 2020 20:05 #32743

Phil Randall Offline Platinum Boarder Posts: 417 Thank you received: 50	1. The top piston stroke is shorter to compensate the extra weight of conrods and side rods. 2. The top piston is guided by the liner. and moves in relationship to the side rods. 3. The top piston conrods are in the crankcase. The side rods transmit the conrod motion to the top piston. See if that makes sense! Phil R.
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Living the Past 11 Jul 2020 21:04 #32744

Chappa Online Platinum Boarder Posts: 441 Thank you received: 39	Thanks Phil one more, all diesel 2 strokes I’ve seen need forced induction (blower) to run but I’m assuming this engine runs just with atmospheric pressure at the intake
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Living the Past 11 Jul 2020 22:54 #32745

Tim D Online Administrator Posts: 2564 Thank you received: 272	You've opened a can of worms with that picture Phil! Dave I recon it must have some type of forced induction, the exhaust and intake are open at the same time. Youtube, not a Doxford but an opposing two stroke. [video]UF5j1DvC954[/video] [video]sWjMBSnq2es[/video]
	Last Edit: 11 Jul 2020 23:04 by Tim D. The administrator has disabled public write access.

Living the Past 11 Jul 2020 23:01 #32746

Tim D Online Administrator Posts: 2564 Thank you received: 272	Another opposed diesel, the Commer Knocker, they were in trucks. A mates old man had one, used it to cart grain on the farm. You'll have to click the link, silly website will not let me link another video https://www.youtube.com/watch?v=pGaISFg_ZIw
	Last Edit: 11 Jul 2020 23:36 by Tim D. The administrator has disabled public write access.

Living the Past 12 Jul 2020 07:49 #32747

Phil Randall Offline Platinum Boarder Posts: 417 Thank you received: 50	YYes!! it can be a can of worms. I should have known better. The Doxfords had mechanical piston type air pumps engine driven. The B and W's had roots blowers chain driven. From about the mid 50's on it was all turbo charging with intercoolers. I have attached a bit of lockdown reading, Phil R. Attachments: ...rip.doc (34KB)
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Living the Past 12 Jul 2020 09:58 #32749

Ken R Offline Platinum Boarder RETIRED? Posts: 2961 Thank you received: 137	Thanks Phil and Tim. Such an old design but very efficient, maybe heading for a car soon?
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Living the Past 12 Jul 2020 11:20 #32751

Damian K Online Expert Boarder Posts: 122 Thank you received: 8	Here is another unusual layout. en.wikipedia.org/wiki/Napier_Deltic
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Living the Past 12 Jul 2020 13:40 #32754

Ken R Offline Platinum Boarder RETIRED? Posts: 2961 Thank you received: 137	Damian K wrote: Here is another unusual layout. en.wikipedia.org/wiki/Napier_Deltic OMG Really!!!!!
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Living the Past 12 Jul 2020 16:51 #32755

Phil Randall
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Thank you received: 50

The deltics were a quandary for some and daily bread for others. They worked well in British trains but no so good in Tasmanian ferrys. Maybee our engineers just weren't up to it!!!. Note the crankshafts are two clockwise and one anti clockwise, that's to get the piston timing right! During the war years the Germans had a similar unit with 4 crankshafts in heavy bombers. I am led to believe that there are no known examples still in existence, Pity!!.

So many wonderful machines, so sad that it takes a war to bring them out!
Phil R.

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