I'm wondering what it says in chalk "Si no tienes nada....." (If you have nothing....) cant read the rest.

I mean, hey, that's how the Big Boy got its nick name.

 

The Lempor work on the Challenger was a fairly recent trial done by UP and was/is not standard equipment. The Challenger's (and FEF's and 4000's) used the UP's own twin stack design from the start, which did not resemble a Lempor.

From what I gathered in talking to John at WRC (who did the contract work) a few years ago the lempor trial exhaust did not win over the existing nozzle stand (at least in the fact that the existing one worked in the eyes of the post Steve Lee management), however the trial was successful.

The spanish phrase on the smokebox door is from LD Porta and is "Si no tienes nada que hacer no vengas a hacerlo aqui Ing. Porta"

Translated:
If you have nothing to do, don't come to do it here. signed Ing Porta

There is no reason why the Aster Challenger cannot be retrofitted with a Lempor or nozzle. A true lempor would require much replumbing of the exhaust to fit the Kordina in place, especially on the front engine.

 

Ryan, sounds like a job for you in your spare time?

 

The Challenger modification was done in 2007-08 but I have not found any report or description of the results. The same comments were on the August, 2008, Trains.com forum. It would be interesting to read it, hopefully it would include diagrams of the installation.

In the photos (above) the Challenger folks looks to be attempting to fit Lempor Exhaust parts to the existing smokebox with few modifications to maintain the Challenger's external appearance. The same was done to one of the restored Garratts at the WHR. This is the email exchange via the Garratt Yahoo Forum to my question; (As compared to the ACR photos of 2 Lempor Exhaust NG/G16 Garratts.)

------------------------------------------------------------------------------------------------------------
WHR NGG16 Lempor Exhaust

Apr 5 7:29 PM

Is a Lempor exhaust verboten on WHR's NGG16 fleet? Through all the web pages I could not find a single NGG16 with the distinctive Lempor tapered stack.

Chris Scott
CA


timmiboiinoz
Apr 6 2:28 AM

Hey Chris
Currently only one of the NG/G16's on the WHR has a Lempor exhaust fitted, number 87. You will not be able to tell it apart from the other 2 as they all carry the same type of chimney.

The ACR Garratt's modified with Lempor exhaust had chimneys designed to be the optimum shape for performance. It is possible (and regularly done) to adapt the inside shape of an existing chimney to suit a "milder" Lempor, thereby retaining the external look of the original loco, a compromise which works well on WHR 87.

Opinion seems divided on how effective it is, however I have found that of the 3, 87 definitely does seem to steam better.

There are some pictures of the Lempor going into 87 here:http://www.whrsoc.org.uk/WHRProject/87.htm

Cheers, Tim

end

Lempor Exhaust as installed during WHR #87 Rebuild;

----------------------------------------------------------------------------------------------------------------

A true Lempor Exhaust system is engineered for the specific locomotive to achieve the performance and efficiency potential. The engineering is complex as alluded to in the above diagram and detailed in, Theory of the Lempor Ejector Description;
http://www.trainweb.org/tusp/lempor/lempor_theory.html
A downloadable .PDF of the same; http://www.martynbane.co.uk/modernsteam/ldp/papers/lempor_theory.pdf

To make the complexity much more clear this tool does the job; THE LEMPOR EJECTOR CALCULATOR;
The Calculator is an MS Excel workbook written to crunch the math:
http://home.ca.inter.net/~mguy/Lempor%20ejector%20calculator%20beta%201.1.xls

Cannot blame either the WHR or UP wanting to not change the outward appearance of their iconic locomotives. The mixed results and reviews performance of their performance is to be expected. And there is no reason to disagree with them or judge their efforts given a very understandable constraint; history and a very dedicated audience fan base.

But the very significant performance and efficiencies to be achieved when properly designed are clearly documented.

Red Devil:
The most complete benefits of the Lempor Exhaust is in David Wardale's book the Red Devil where Porta's Theories were put into practice vastly improving the performance of 2 locomotives converted. The book (2 editions) is out of print; expensive in good condition.

Book Review of Red Devil
http://www.railroad.net/forums/viewtopic.php?f=13&t=62695


Further reading;
6A and the Lempor Puffing Billy Railway modified NA 2-6-2t 6A, Marshall, Don;
http://www.martynbane.co.uk/modernsteam/nday/6aandthelempor.htm

THE PRACTICAL APPLICATION OF 'PORTA TREATMENT'- AN ADVANCED
INTERNAL BOILER WATER TREATMENT SYSTEM - ON STEAM LOCOMOTIVES OF
THE FERROCARRIL AUSTRAL FUEGUINO, REP. ARGENTINA.
http://www.martynbane.co.uk/modernsteam/pt/apppaper.pdf

.
While a Lempor Exhaust is obviously beyond our Gauge 1, etc. scales, it has been installed on 7 1/2 gauge and larger small steam locomotives. However, I believe there are some aspects or ideas for improving our scale locomotive's exhaust and performance.
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The Challenger Lempor was a failure unfortunately. One thing a Lempor needs is a chimney of sufficient length to allow for proper expansion. The Challenger doesn't have the height available to perform properly from what I was told.

While a Lempor Exhaust is obviously beyond our Gauge 1, etc. scales

Are you sure about that? http://www.martynbane.co.uk/modernsteam/nday/45mm/45mm.htm

 

Chris, anyone who believes anything you say should first check out the thread on Railroad Operations, MOW Caboose . Same Forum.
And I quote "my postings were not intended to be real". thank you

 

Sorry, I messed up the whole thing, trying to bring his statements from another thread into this one, you will have to look back to see what I am talking about, thank you

 

Well at last there are some hardy modelers and model engeneers trying to improve the performance on our small scale steam models. This is real good news, as far as I am concearned it was my main reason to getting involved with live steam in 1975. I wanted to check out some of the teachings of Chapelon on models to see if it worked. This is also why I got to know and become a friend of JV Riemsdijk. He certainly pushed things along quite a bit. It's good to see others are doing research too. I should get on with more advanced things like internal streamlining and feedwater heaters soon as I will be retired and can implement these things, time wise. But congratulations for those hardy who are into it already like Belpair.