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Engine dyno test

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rboulware

02-21-2006 06:50:18

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I had a guy do a dyno test on a tractor that I was intrested in buying. It was an AC D19, it dynoed about 68 HP which is 4 hp less than what is rated for. He said it smoked just alittle on start up then cleared up after it was running. My question is HOW acurrate are these dyno test? Does it sound like this motor needs over hualing?

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RAB

02-21-2006 11:49:59

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Re: Engine dyno test in reply to rboulware, 02-21-2006 06:50:18

I am wondering where you got your figures from.

My Nebraska Tests book says a maximum of 71.5 HP at 2000 rpm at the PTO for the gas model. That was with a top notch example, chosen by AC?
That figure dropped to 65.2 at PTO rated speed.
The diesel version recorded a max pto output of almost 67 HP.

You can be sure any other internal losses were kept to a minimum for those tests, and that was 40 years younger and newer than yours is now?

That is apart from the test accuracy points brought up in other posts.

I was looking at tests #810 & #811, April 1962.
Regards, RAB

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Jerry/MT

02-21-2006 09:27:03

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Re: Engine dyno test in reply to rboulware, 02-21-2006 06:50:18

For an old used gas tractor to dyno within 6% of its new rated rated power at rated speed (if corrected for atmospheric conditions) sounds pretty good to me. If it was just completly overhauled I'd expect it to hit rated power at rated rpm as a minimum. Generally they are a little better than the rating when new. If it smoked a bit at idle at start up and the smoke was bluish, I'd suspect some worn valve guides/seals if it was an overhead valve engine. if the smoke was blackish, I'd suspect a carb adjustment.
Just my opinion

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the tractor vet

02-21-2006 07:39:23

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Re: Engine dyno test in reply to rboulware, 02-21-2006 06:50:18

Just sitcking it on the DYNO is not a true test unless ya start putting things on the engine like a manometer to massure the amount of blow by and tune the engine then run the test andi don't mean just a set of plugs and points i mean a major tune up adjusting valves checking the dist curve if a it is a gasser or checking correct pump timming and pump delivery fuel flow air flow with out the air cleaner hooked up water temp oil pressure the list goes on . And also no two porable DYNO's read the same as who knowes when it was last serviced and certified . I know of two just around here that are the same dyno but will give two differant readings on the same tractor like 15 horse differance. So witch one is correct?????

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steve from mo - dangit!

02-21-2006 07:03:25

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Need more info. in reply to rboulware, 02-21-2006 06:50:18

There would be some variance among dynos. A good gas engine tune including fresh plugs and proper timing and carburetor adjustment would more than make up for 4 hp. For a diesel, pump timing and fuel delivery setup make the same difference.

To decide whether an overhaul is needed, you would want to know more about the tractor and what you plan to do with it. You don't need a fresh tight engine for the occasional parade or show unless the smoke is considerable.

Compression? Measure this for each cylinder - once dry and once with a little oil in each cylinder. If the rings are worn, the pressure will increase with some oil to fill in the gaps.

Oil consumption?

Oil in radiator/water in oil pan?

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rboulware

02-21-2006 08:41:25

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Re: Need more info. in reply to steve from mo - dangit!, 02-21-2006 07:03:25

Well he said he talked with the owner and he replaced a few things in the motor but nothing major. I think he said iol pump drive shaft and a few other things he said he had the head off and things looked real good. Don't really know what that means though....Also talking with the sales guy he said that the smoke on the first two minutes of startup is most likely a Carbarator adjustment and nothing major...
What do yall think.....go with the deere?

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TomTX

02-21-2006 09:56:24

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Re: Need more info. in reply to rboulware, 02-21-2006 08:41:25

Ask him why he "had the head off"? Did he have the valves ground? Check the valve springs? Magnaflux? Mil? Valve guides? Valve seals? If a man told me he "had the head off" I would have plenty of questions. He surely took it off for some serious reason. If he is evasive or won't answer, then move on. Tom

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