Post
by Lavoy » Fri Sep 01, 2006 4:49 pm
Okay, more interesting info:
Current data posted below reference Sulfated Ash content Posted 11/26/05
Rumors are that the Delo® 400 has been modified and there is no longer a need to use Delo® 100. The following is direct from the Chevron® Web Page
ChevronTexaco® Global Lubricants
Improves Market Leading Delo® 400
Multigrade Diesel Engine Oil
- New Formulation Reduces Wear,
Improves Soot Dispersancy and
Complies With CI-4 Plus Performance Requirements
Yes the 400 has been modified, BUT the Ash Rate is over the limit of Detroit Diesel® specifications (1.41% to 1.50%) and As of this date does not give the staying qualities of the Delo® 100!!!
Special Bulletin!
Re:
Scarcity of Availability
of
Straight 40 WT. Oils Information is now posted in at TEJAS OIL.
Instructions where to find Locations with MAP & PHONE links.
Detroit Diesel Allison® Lube Oil Recommendations for
Detroit Diesel® 2-Cycle Engines
DDC publication 6SA314 8901
--------------------------------------------------------------------------------
Function of Lubricating Oils
All diesel engines require heavy duty lubricating oils. Basic requirements of such oils are:
Lubricating quality
High heat resistance
Control of contaminants
Lubricating Quality
The reduction of friction and wear by maintaining an oil film between moving parts is the primary requisite of a lubricant. Film thickness and its ability to prevent metal-to-metal contact of moving parts is related to oil viscosity. The optimums for Detroit Diesel® two-cycle engines are SAE 40 grade oils.
High Heat Resistance
Temperature is the most important factor in determining the rate at which deterioration or oxidation of the lubricating oil will occur. The oil should have adequate thermal stability at elevated temperatures, thereby precluding formation of harmful carbonaceous and/or ash deposits.
Control of Contaminants
The piston and compression rings must ride on a film of oil to minimize wear and prevent cylinder seizure. At normal rates of consumption, oil reaches a temperature zone at the upper part of the piston where rapid oxidation and carbonization can occur. In addition, as oil circulates through the engine, it is continuously contaminated by soot, acids, and water originating from combustion. Until they are exhausted, detergent and dispersant additives aid in keeping sludge and varnish from depositing on engine parts. But such additives in excessive quantities can result in detrimental ash deposits. If abnormal ash deposits form on the exhaust valve seats, early engine failure may result. Oil that is carried up the cylinder liner wall is normally consumed during engine operation. The oil and additives leave carbonaceous and/or ash deposits when subjected to the elevated temperatures of the combustion chamber. The amount of deposits is influenced by the composition, additive content, engine temperature, and oil consumption rate.
Oil Quality
Oil quality is the responsibility of the oil supplier. (The term "oil supplier" is applicable to refiners, blenders, and re branders of petroleum products). Oil quality can also be affected by handling cleanliness, contamination, dirt, water, etc.
Lubricant Recommendation for Detroit Diesel® Two-Cycle Engines
SAE Viscosity Grade 40
API Classification: CD-II, (Note: CD-II is an obsolete designation replaced by the current API Rating CF-2)
Military Spec: MIL-L-2104D
Sulfated Ash: Less than 1.0%
Sulfated
Ash Rate
Comparison
Chart Delo® 100 40 WT = 0.76
(Delo® 100 is ONLY oil meeting and beating the benchmark! 24% BELOW benchmark)
Shell Rotella® 40T = 1.00
(Shell Rotella® 40T is borderline)
Delo® 400 40 WT = 1.35
(Delo® 400 currently 35% ABOVE and OUT of TOLERANCE of the benchmark)
This data is current as of 11/23/05 according to each Oil Producer's published web sites
This is the only engine oil recommended for Detroit Diesel® two-cycle engines. Lubricants meeting these criteria have provided maximum engine life when used in conjunction with recommended oil drain and filter maintenance schedules. (For additional oil selection criteria, see publication 7SE270.) The API category CD-II (CF-2)(Note: CD-II is an obsolete designation replaced by the current API Rating CF-2) is relatively new and may not be fully in use at the time of this publication. (NOTE: This publication was published in 1989) API category CD may be used provided the recommended military specification is satisfied. Oils with API designation "CE" are not recommended in DDC two-cycle engines unless accompanied by CD-II (CF-2) (Note: CD-II is an obsolete designation replaced by the current API Rating CF-2)
Single Grade-High Ash Content Lube Oils
High ash oils (greater than 1,000 mass % ASTM D-874) tend to form excessive deposits on engine parts, resulting in impairment of their function (exhaust valve closure, for example). These are NOT recommended, except where the continuous use of high sulfur content diesel fuels (greater than 0.5 mass %) is unavoidable and where a high TBN, LOW ASH oil is not available.
Multi-Vis Oils
Less than optimum engine life must be expected when using 15w-40 oils. Multi-vis oils tend to break down due to mechanical and thermal stress which results in a loss of viscosity and premature engine wear. Multi-vis oils do help cranking when temperatures are below 32 degrees F (0 degrees C). However, once the engine starts, the major advantage of the multi-vis oils is exhausted. When the engine reaches operating temperature, the internal engine temperatures and pressures vary little from an engine operating in much warmer climates. This is when the 2 cycle engine benefits from the superior protection of a 40 wt.
Starting aids such as automatic ether systems and /or on-board auxiliary heaters provide more reliable starting without sacrificing engine life.
, but, I just want to be sure since I am brand new to this little engine.
Once again Lavoy, you've outdone yourself. This site has to be approaching accreditation for at least 1 college credit in some form of mechanical studies.