Engine dyno coversion to miles
Engine dyno coversion to miles
(OP)
Does anyone have a source or article describing how to translate hours on a dynomometer to miles per hour. I know that you can use a "N/V" value of 35 to convert RPM to MPH, but I need a source to reference and document the derivation of this number. I am arguing with some coleagues about the proper way to translate hours into miles.
Thank you!
Randy
Thank you!
Randy





RE: Engine dyno coversion to miles
Half a million miles life out of a taxi or truck engine is not unknown. A racing sports car is not going to be quite the same. Life on a dyno can be as easy or as harsh as you wish to make it.
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
Also the engine might not be able to pull those revs when in a car in a higher gear.
There are formula's to convert co-efficient of drag and frontal area to power required for particular speeds. These can be compared to engine output at the wheels at full throttle at a similar speed. Obviously if the power output is less than required, the speed will not be reached.
Dyno hours do not translate well to engine life unless you have a lot of data about conditions of use, and an ability to translate those conditions to data to control the dyno load and engine speed.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
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RE: Engine dyno coversion to miles
If it can't sustain 100 hours then don't bother looking at other speeds and so on.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Engine dyno coversion to miles
Thank you,
Randy
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
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Franz
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
I'm a bit surprised that a company with a miles/qt bogey doesn't have experience relating oil consumption measurement in test to typical results in the field. I wouldn't expect to find an EPA document on the subject, since they don't directly regulate vehicle oil consumption, and I would be surprised if an OEM gave away so much info about the behavior of their engines & vehicles in an SAE paper (but someone might have). You could try calling an engineering consulting firm with automotive experience - Southwest, Ricardo, et al. may have an answer for you.
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
* Is the OC cycle in question based on this particular fleet's operating characteristics? (I assume that's what you meant)
* If it is, then in what way doesn't it correlate, and why?
* If the cycle is based on the operating characteristics of the fleet, then shouldn't the cycle weighting factors give you an effective average MPH that is the same as the fleet average MPH?
* Does the average MPH calculation exclude any key operating points? Does the cycle overemphasize certain load points, to the detriment of the average speed calculation (too much idle, not enough low speed low load, maybe?)
When it comes right down to it, it sounds to me like you need to talk to someone at the customer to find out why your methods don't align with theirs, and see whether some sort of conversion or adjustment can be agreed upon. At the end of the day, whatever requirement they have is going to be the one you're stuck with, right?
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles
RE: Engine dyno coversion to miles