Dynamometer testing

[Eureka]

Hey friends,
Could anyone plz tell me the points where the less preffered flow bench testing lacks as compared to the dynamometer testing for engine.
Also, while proceeding for dynamometer testing, should we fabricate our complete engine(manufactured) and then use it for testing or we can do something else??? Please give some ideas.

[Eureka]

Hey friends,
Could anyone plz tell me the points where the less preffered flow bench testing lacks as compared to the dynamometer testing for engine.
Also, while proceeding for dynamometer testing, should we fabricate our complete engine(manufactured) and then use it for testing or we can do something else??? Please give some ideas.

[Fred G]

http://fsae.com/eve/forums/a/t...25607348/m/243104093 (http://fsae.com/eve/forums/a/tpc/f/125607348/m/243104093)

This should answer your first questions.

Now for your second question, it depends on your resources, mainly time.

Ideally, you'd test each system in isolation to build up a understanding of how each sub system of the engine affects the global output. It's just like any other science experient you'd ever do, have a control and very few, better yet, one variable to adjust to seek trends. But we live in a real world, so there will be variables out of your control.

Dynos, flowbenches are used to validate your models. Of the two, the dyno is more valueble.

Hope that clears things up,

Regards
Fred

[Eureka]

Thanks Fred,
But i wanna know that should we first fabricate the individual parts and then test their efficiency (But If the part doesn't give the desired output, that would waste our resources) Or is there any other way ( like any softwares,model, etc) we can approach for.

PLEASE REPLY SOON....

[Mikey Antonakakis]

First of all, try to refrain from making demands on here. Secondly, find the stickied thread with required reading material and read some of the books about engines. I think you'll find your answer (and more) there.

[Fred G]

Yes, it is a waste of resource if your part doesn't give a desired output. But as the engineer, you can find out why your output didn't behave the way it should and try rectify it and hopefully learn something. The smarter engineer would build his individual parts based on models that work. The testing is a validation of that work.

How you go about testing, evaluating and refining your parts is based on your resources and the manufacturing techniques employed.

Model first, or even start with a benchmark, something that's been made, that you doesn't have to be made... it's called a stock part.. and measure the output. Go from there, iteratively/numberically test your model and see if it makes sense. Then "optimise/compromise", then rebuild your part if necessary.

Depending on your resources, you'll have to do a sensitivity analysis on the performance gain/ part redesign/manufacture and choose which items you'd want to change.

If you're a first year team with limited resources, intake and tuning would be easily be achieveable and testable, add in the exhaust also. Steer clear of internal mods. It's also great to have more than 1 engine at your disposal.

Give us an idea of what you plan on doing.

Cheers
Fred

[Eureka]

Thanks Fred for your valuable suggestions! will sure take ur points.

Will inform u about our plans :-)

[Mikey Antonakakis]

A couple things to pay attention to when analyzing stock parts.

Lengths of intake and exhaust runners.
Diameters of intake and exhaust runners.
Size/shape of plenum/airbox.
Exhaust layout (4-1, 4-2-1, something else?).
Most importantly, the effect the restrictor has on the engine, and what changes can be made to the stock system to take account for them.

If you have some more specific questions, ask as many as you want.

It shouldn't be a problem using your competition engine on the dyno (I think that's what you were asking). Just don't blow it up, because then you won't have an engine http://fsae.com/groupee_common/emoticons/icon_wink.gif

[Eureka]

Thanks for the reply.
There's one more query. Is it possible to carry out the dynamometer testing on the prototypes of the engine components that needs to be tested? Or is there any better alternative that we can follow?