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While looking for something else, I found some additional information in "Diesel and High Compression Gas Engines" by Kates and Luck 3rd Ed: "...Therefore, the improved efficiency obtained with higher compression is not due to the compression itself, but due to the fact that higher compression...

I interpreted this as increased compression ratio does not improve efficiency: From Haddad "In practice, the higher the compression ratio, the higher will be the engine friction, leakage, and torque for starting. Thus, diesel engine designers use the lowest compression ratio consistent with...

Given the fact that the aftermarket is abandoning this engine (see the head gasket thread), gaskets and other hard parts will become increasingly hard to find. Don't reinvent the wheel. Put your money into something with better engineering, better parts support, more horsepower potential, and...

Look at the last post in this thread http://forums.yesterdaystractors.com/viewtopic.php?t=436351 " The nozzle in the 585 MM has 1 large hole to shoot into the deep piston bowl, while the Hercules has 1 large hole and a small one." Isn't this the same as the multifuel...

http://forums.yesterdaystractors.com/viewtopic.php?t=603047 "I know we rebuilt some White heads in that class and the specs for the valve seat height was different on the military heads than on the D-5000 engines"

Why do you say it doesn't have the swirl design?

Why could it go one way but not the other? They are virtually the same engine.

This thread talks about turning up the pump on the tractor engines to get more horsepower: http://talk.newagtalk.com/forums/thread-view.asp?tid=320653&DisplayType=nested&setCookie=1 Head studs being a problem were mentioned...

Why not? The tractor engines often get the multifuel pistons to facilitate easier starting. See this thread:http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=oliver&th=116171%253E http://forums.yesterdaystractors.com/viewtopic.php?t=603047

Not having any idea of the resulting outcome, it would be an expensive test. If you have the money to play around, probably better to try something newer like a DT360 or 5.9 cummins. Better oem and aftermarket support.

Based on the TMs, the LDS465-1/A has 175 HP. Hardly seems worth $2500 for the difference which can easily be made up with a tweak to the LDT's injection pump.

Turn up the fuel on an LDT; same thing and you can save $2500. It is only 40 or so HP difference.

The high compression hurts overall efficiency because it results in more frictional losses and more blow-by. It also causes higher peak cylinder pressures which stresses the engine. If you look at modern engines, they have lowered the compression ratio and increased the boost. The engine...