LD-465 and LDS-465 development

[JasonS]

I downloaded a paper from the SAE "Development of Multifuel Features of the LD-465 and LDS-465 Military Engines". It describes the evolution of the LDS-427 into the later LD(s)-465-1,2. One of the more interesting statements was this: "Work has continued for further performance increases, in which 550 ft-lb peak torque and 250 hp has been demonstrated, and 300 hp appears possible while retaining the multifuel capability." It does not describe how this was accomplished.

 

[gimpyrobb]

When you have "Uncle Sam's" money, you can do alot.

 

[NDT]

Can you upload this to Steel Soldiers so we can all read it?

 

[JasonS]

I can't upload it. The pdf document can only be viewed on my computer and I have already printed my first of two allowed copies (digital rights management). There isn't really THAT much new and the document is only nine pages.

It specifically states that the following features contribute to the multifuel capabillty:

1) the hypercycle combustion system.
2) intake swirl port
3) water heated intake manifold (NOT designed to be a crude aftercooler)
4) manifold flame heater
5) fuel density compensator.

Items 1 and 2 are widely described in the literature as the MAN "M" combustion chamber. The literature also states that the only real change needed for multifuel capability is high compression. A drawback of ultrahigh compression ratio is a higher and quicker rise in combustion pressure; hence the need for stronger engine components. In addition, several other engine manufacturers have built and published their accounts with multifuel engines (GM two-stroke diesels, White/Reo, etc).

The development of the LDS-427 is described here:
W. F. Isley, "A multifuel engine experience," ASME Trans., Vol. 84, Series A, No. 2 (April 1962)

The MAN "M" combustion chamber design is described here:
J.S. Meurer, "Evaluation of reaction kinetics eliminates diesel knock: The M-combustion system of MAN," SAE Trans., Vol. 64 (1956), p. 250.

J.S. Meurer, "Multifuel Engine Practice," SAE Trans., Vol. 70 (1962), P. 712.

 

[OPCOM]

Well the printed document could be scanned, but that wouldn't be kosher.

 

[cranetruck]

What's the SAE document number(s)? They should be for sale to members (with a discount) and non-members for about $20....

 

[JasonS]

Easiest way is to go to SAE website store and search "papers" or "transactions" for "multifuel". There is quite a bit out there. I wasn't able to get a photocopy through interlibrary loan for ANY of the "papers". The transactions should be in a library near you and available through interlibrary loan for free. The above document was $16 for nine pages (640371). Interesting but not a good value for the minimal content.

 

[cranetruck]

Information on Downloading Full-Text Documents

 

[JasonS]

One other interesting point is that the LDS piston cooling channel only decreases piston top ring temperature by 100°F (only 50% of the squirted oil makes it into the channel). "Oil is circulated through this annulus to reduce the temperature of the ring groove and thereby eliminate the requirement for high additive oil to prevent excessive ring groove carbon formulation." This was written in 1964 and clearly oil is much better today.

 

[brianp454]

Did any of you ever download any of these papers, and if so, will you share them?

If not, I can go into the University after I get enrolled for next Semester and see if I can get them that way.