Twin carbed Duesnebergs

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28 Oct 2011 11:11 #21275 by landmark
landmark replied the topic:
Hello,

does someone know the real(istic) HP output of the different "serial" J engine configurations?
I mean for the uncharged (downdraft-/updraft Carb) engine, the charged engine fitted with a single carb and the charged engines fitted with two carbs.

As I read in an article at "Road & Track" (Misc. Ramblings - Duesenberg Model J from May 1953) the real Power output (J-110) was about 208 BHP at 3600 RPM.
In the same article was written that the SJ (single-Carb) engines reach (realistic) 265 BHP.

In some articles at german books it was mentioned that the engines of the two "SSJ" Roadster where "tuned" the same way (compression?, valve-timing?) as the Mormon Meteor with an estimated power output of ca. 400 HP.

I am sure that the uncharged "Specials" with four single (Sidedraft) Carbs mounted and higher Compression (8:1 ?) Pistons would reach easily 265 HP and more.

Had the Duesenberg company used the same camshaft-configuration (valve timing) in every J engines or had they made (timing) changes during the production-time of the J engines?

The valve timing data (for engine J-110) published in article at "Road & Track" differ to the data published at the "Duesenberg owners companion".


Landmark

Was man besonders gerne tut,
ist selten ganz besonders gut

Wilhelm Busch

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  • Bob Roller
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28 Oct 2011 21:26 #21276 by Bob Roller
Bob Roller replied the topic: Actual horsepower output of the "j"
It apparently varied quite a bit, J 110 as I recall was substandard from the beginning and was never installed in a chassis. I think the best reading was about 208HP at 3600RPM. Another writer said that number 8 cylinder's coolant area was blocked by a defectively cast motor block and put a big drag on the other 7 cylinders from an overheated cylinder
Higher compression pistons worked as time went on and mechanics and experimenters worked on the engines and my own exerience with J528 bears this out. The only way to get more energy from gasoline is to compress the
air/gas mixture and when the low octane fuels available in 1929 are factored into a stock engine,if the actual output was anywhere near the claimed 265HP then it proved the soundness of the engineering that brought it about.. I think it was an article in a long ago Automoble Quarterly that said "as delivered to the original buyer,the engine probably did actually deliver about 245HP but might possibly be tuned at higher cost to the claimed 265HP advertised.
The Duesenberg Special was said to have different cams but just how different I certainly don't know but at a guess,I'd say they had longer duration per cycle.If you look at the original cams,they have little dwell time but the engines usually will idle smoothly and in the days of the new "J",smooth idle was always expected from any luxury car. Down draft carburetors helped a lot too.
To Silverghost:
Thanks for the infor on Mr.Pitcairn. The old mechanic,Lou Musgrove spoke highly of him but not of the autogyro or any helicopter (Dammit,wings don't rotate,propellors rotate") It's men like Pitcairn,the uncommon ones that are being discouraged today by a political twit and I will leave it at that.
Thanks again.

Bob Roller

Bob Roller

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29 Oct 2011 00:10 #21280 by alsancle
alsancle replied the topic:
A Pitcairn autogyro. I understand A.K. Miller's was up in one of the barn lofts.

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29 Oct 2011 09:03 #21282 by landmark
landmark replied the topic:

alsancle wrote: A Pitcairn autogyro. I understand A.K. Miller's was up in one of the barn lofts.
...


Hello,

the Pitcairn Autogyro was as well at a very popular movie from 1934.

Frank Capra's "It happened one night" starring Clark Gable and Claudette Colbert.
You can see the Autogyro landing @ 4.20 min http://www.youtube.com/watch?v=yWbP8eHR ... re=related

The Autogyro needs a very short runway to start: http://www.youtube.com/watch?v=FHDvyKFs5Zk

In Hildesheim, some 50mls away of my hometown in Germany, the AutoGyro Company produce some modern types of Autogyro aircrafts.

http://www.auto-gyro.com/en/Calidus/

http://www.youtube.com/watch?v=kPjAp-Y0 ... re=related

http://www.youtube.com/watch?v=B9kVsmuuo0Q


Matt

Was man besonders gerne tut,
ist selten ganz besonders gut

Wilhelm Busch

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