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<blockquote data-quote="DiamondSCattleCo" data-source="post: 663821" data-attributes="member: 2862"><p>Your statement is completely dead nuts wrong. Dynos have been used by heavy engine techs for decades to determine _if_ and _what_ issues a powertrain may have.</p><p></p><p>Every manufacturer publishes HP specs, along with a tolerance guideline as to acceptable leeway. You put the unit on the dyno and watch it run for an hour with a gradual application of the resistance mechanism. Then you watch how the unit responds. Amount of smoke, color of smoke, engine noise, oil pressure, excessive heat from the PTO, and OVERALL HP will give you an accurate assesment of what kind of shape the power unit is in. It will point out oil consumption, blowby (two different things, one caused by bad wipers, the other by bad compression rings), injection pump weaknesses and bearing weaknesses.</p><p></p><p>Oil analyses are an internet fallacy, especially the $18.95 "we analyze it all" types you see listed. Often times the companies don't bother to clean or sterilize testing equipment properly, with the end result being completely inaccurate.</p><p></p><p>For an oil analysis to be remotely accurate the following conditions MUST be satisfied:</p><p>1) Your engine oil must have a baseline analysis.</p><p>2) You must know the hours on the oil that you've sent away.</p><p>3) The power unit must have a history of accurate analyses.</p><p>4) The analysis must be done by a reputable lab. This style of analysis will typically cost a couple hundred bucks.</p><p></p><p>Even if the power unit has a history of analyses, chances are the oil will have been changed anyway, and no dealer (or privateer) will let you put 2 or 300 hours on an engine, then wait 2 weeks for an analysis to come back.</p><p></p><p>Quite frankly your best tool is somone who knows engines and tractors, especially if they're familiar with the unit you have your eye on. A good wrench can hear and spot potential issues without having fancy HP tests and oil analyses...</p><p></p><p>Rod</p></blockquote><p></p>
[QUOTE="DiamondSCattleCo, post: 663821, member: 2862"] Your statement is completely dead nuts wrong. Dynos have been used by heavy engine techs for decades to determine _if_ and _what_ issues a powertrain may have. Every manufacturer publishes HP specs, along with a tolerance guideline as to acceptable leeway. You put the unit on the dyno and watch it run for an hour with a gradual application of the resistance mechanism. Then you watch how the unit responds. Amount of smoke, color of smoke, engine noise, oil pressure, excessive heat from the PTO, and OVERALL HP will give you an accurate assesment of what kind of shape the power unit is in. It will point out oil consumption, blowby (two different things, one caused by bad wipers, the other by bad compression rings), injection pump weaknesses and bearing weaknesses. Oil analyses are an internet fallacy, especially the $18.95 "we analyze it all" types you see listed. Often times the companies don't bother to clean or sterilize testing equipment properly, with the end result being completely inaccurate. For an oil analysis to be remotely accurate the following conditions MUST be satisfied: 1) Your engine oil must have a baseline analysis. 2) You must know the hours on the oil that you've sent away. 3) The power unit must have a history of accurate analyses. 4) The analysis must be done by a reputable lab. This style of analysis will typically cost a couple hundred bucks. Even if the power unit has a history of analyses, chances are the oil will have been changed anyway, and no dealer (or privateer) will let you put 2 or 300 hours on an engine, then wait 2 weeks for an analysis to come back. Quite frankly your best tool is somone who knows engines and tractors, especially if they're familiar with the unit you have your eye on. A good wrench can hear and spot potential issues without having fancy HP tests and oil analyses... Rod [/QUOTE]
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