The 'Castle' 1921 Duesenberg Straight 8 Model A (Model J par

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26 Jan 2014 04:07 #26768 by Mike Dube
Mike Dube replied the topic: Nine mains
Bob,

Agreed, no substitute for greater bearing surface in long engines with long rods. In Fred's defense, the A was developed from their 3 valve racing engine & designed mainly for speed. As others had said, they were interested in road cars only to support racing.

As to the J ? Well.... the boss wanted that one.

Mike
8-100A

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26 Jan 2014 10:37 #26769 by 61xlch
61xlch replied the topic:
I am just rebuilding a Model A engine and I was really frightened about the fragile engine housing, combined with a really huge and heavy crankshaft with only 3 main bearings. Combined with an extraorinary long stroke and pretty sleek connecting rods a bad qualification for high revs and much power. This stands in contrast with the otherwise very progressive layout of these engines.
But keep in mind, this engine was created in the late teens, you can?t compare it to an engine from 1941! This is nearly as much difference in time between the first automobiles and the Duesy A engine.
Cheers
Andy

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26 Jan 2014 13:40 #26773 by Bob Roller
Bob Roller replied the topic: Comparing engines,eras and products of eras
When the quality of oils,bearings and crankshaft finishes are factored in,it is a minor miracle that any of these WW1 era engines finished a race.
I have wondered for years about the oil used in the Duesenberg Special in 1935.Is there any data on it from any source?
I have never seen a Model "A" Duesenberg engine taken apart so can't really comment about the three main bearings but I do know others used it in 6 cylinder engines. The Chandler is one I'm familiar with and that was appalled at the flimsy construction of the bottom side of this engine.
I would think adding 2 more crank journals would be a bit much.Just how
well did these engines hold up in every day use? I think about 650 were made and that is many more than the "J". One thing is sure,old E.L.Cord had the right idea,tromp it and go in the grand manner.Lots of fun and I speak from experience.

Bob Roller

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26 Jan 2014 17:29 #26780 by Bob Roller
Bob Roller replied the topic: Crankshaft and weak motor block
Andy,
IF the whole assembly is REALLY balanced,rods,crankshaft,flywheel,clutch,pressure plate and maybe a vibration* dampener on the front of the crankshaft,it should be alright
Any vibration would soon start to damage those 3 mainbearings.
What does the crankshaft on that "A"engine weigh by itself and is the bolt pattern in the flywheel irregular so it goes on the crankshaft only one way
like the "J" does.It was probably balanced as if it were one piece when it was new.
*I don't know if these engines had a vibration dampener or not.

Bob Roller

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26 Jan 2014 17:44 #26782 by 61xlch
61xlch replied the topic: Re: Crankshaft and weak motor block

Bob Roller wrote: Andy,
IF the whole assembly is REALLY balanced,rods,crankshaft,flywheel,clutch,pressure plate and maybe a vibration* dampener on the front of the crankshaft,it should be alright
Any vibration would soon start to damage those 3 mainbearings.
What does the crankshaft on that "A"engine weigh by itself and is the bolt pattern in the flywheel irregular so it goes on the crankshaft only one way
like the "J" does.It was probably balanced as if it were one piece when it was new.
*I don't know if these engines had a vibration dampener or not.

Bob Roller


As far as I know, no dampener. The weight of the crankshaft and the flywheel bolt pattern I don?t know right know, but will check it out.
Anyway, I won?t rev it higher than necessary for normal street cruising, no racing intentions. This should be the key for a long lasting engine life.

Andy

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