| Author | Message | ||
     Blake |
First with the correct answers wins... copied from... http://www.me.udel.edu/meeg467/Powertrains/Final-Notes.doc | ||
| Buellin_ri |
The correct answer is 11. Wait what was the question I think I nodded off. | ||
| Spiderman |
True | ||
| Kccyclone |
I'm gonna go with: n) one of the above | ||
| Phonemanjustin |
The Ultimate answer to Life, the Universe and Everything is... (You're not going to like it...) Is... 42 | ||
| Buellin_ri |
NO, no, no....its 11. | ||
| T9r |
U Del, right up the road 30 min. from me. Looked like some neat classes, Race Car Vehicle Dynamics and Powertrain Theory. | ||
| Lake_bueller |
what is are ma and me? 1) Poor grammer 2) Redneck family 3) Transgender confused individual | ||
| M1combat |
All I know is that it's a Husquevarna. | ||
| Oldog |
a) What is the volume of the combustion chamber? some thing less than 500 cc b) What is the true compression ratio (after ports are closed)? some thing less than 13:1 CR c) If the scavenging ratio is 90%, what are ma and me? mother and son? d) If the trapping ratio is 75% what are the charging and delivery ratios? } just some numbers on a test e) Draw the PV diagram, idealized, ignore the area where the ports are open. I did draw it byt I had to wipe the screen off to finish the test f) Assuming a 14.7: A/F mixture in the cylinder, what is the mass of air and fuel inducted per stroke? enough to fill the cylinder g) Calculate Temperatures and pressures around the cycle. (1) is where the exhaust port closes and (4) is where it opens. CAREFUL – there is more mass in the cylinder than just the new charge! Model 4-1 as if it were a standard SI engine. well its hotest right around the exhaust pipes, at the cylinder head h) How much heat is wasted (rejected?) enough to burn you i) What is the Otto efficiency? (Calculate it three ways, carefiul to use the appropriate compression ratio) how good a job otto does fixing this motor j) If the indicated efficiency is 50% of the otto efficiency what is the sfc? means SFC who ever he is had better get busy fixing that motor! k) At 6000 RPM maximum power is made. What are the air and fuel flow rates? high ! l) What is the brake power at 6000 RPM? kW and HP I thought we were taking about motors not brakes m) What is the BMEP at 6000 RPM? higher than at 5000 for sure } -------------------------------------------------------------------------------- Ok just what did i win? (Message edited by oldog on January 18, 2006) (Message edited by oldog on January 18, 2006) | ||
| Blake |
You got the first one half wrong amigo. Kind of a trick question. Two volumes, one at BDC and one at TDC. So you are half right.  | ||
| Doughnut |
Sorry, the answer to all is 42, just ask the mice. | ||
| Gowindward |
500*(1/13)=Vol. of combustion chamber | ||
| Crusty |
Here's a very different, but very important question: Which came first; the chicken or the egg. Why? | ||
| Blake |
Loren (Gowindward), Almost, not quite... CR= VBDC/VTDC So, VTDC=VBDC/CR But at this point, we don't know either VBDC or VTDC. But we do know the compression ratio (CR) is 13.0 and the displacement (VDISP) is 500cc. The first key to the puzzle is to recognize that... VBDC = VTDC + VDISP So we now have the ubiquitous two equations and two unknowns. (engineers everywhere are cheering) ![: ]](http://www.badweatherbikers.com/buell/clipart/proud.gif) Carry on; you're on the right track. It's a bit of an algebra puzzle. Fun stuff and good exercise for the brain. No pain, no gain. | ||
| Seth |
..a duck? | ||
| Crusty |
No, Ducatis don't like eggs. | ||
| Blake |
The bible says God created animals, so in that case one would have to go with the chicken being first. Plus in a natural setting a chicken egg won't hatch without the mother hen to keep it warm. Or if you prefer evolution, all species of plant and animal is theorized to have evolved from single-celled organisms whose mode of reproduction was to simply divide themselves in two. This most resembles the traits of an egg after conception, thus the egg was first.  Insufferable ain't I? | ||
| Newfie_buell |
Doughnut, Did the mouse survive after being shoved down the spark plug hole? Does it have a pull shock? Don't know about you guys but after reading that I need a nice drink of SCREECH!!!! | ||
| T9r |
If you know your vehicles compression ratio already, combustion chamber volume can be calculated thus: Total cylinder volume (cc)/(Compression ratio - 1.00) | ||
| Slaughter |
Blake - You BASTID! I'm gonna be distracted all day with this. | ||
| Crusty |
Sorry, Blake; while your answer is well thought out and covers different contingencies, it is still wrong. The obvious and only logical answer is the egg came first. To wit: While we eat chicken for dinner, we eat eggs for breakfast and breakfast invariably happens before dinner. Also, nobody wants chicken for breakfast; maybe some chicken soup for lunch, but lunch is also after breakfast. However, I have heard something to the effect that in Newfoundland, Puffins and muffins co-exist, but Puffins aren't chickens though muffins are eaten at breakfast time. Nevertheless, the correct answer is still the egg. | ||
| Light_keeper |
No way the protoplasm came first. The primordial ozzz. The slime on the video.  | ||
| Oz666 |
Light_keeper- I try to keep MY protoplasm intact, that would be the primordial Oz... There is, in fact, a direct relationship between the number of "muffins" and the number of "Puffins" in NL (I've seen it, uh, them, uh, you know...) I'll take a whack at the above problem, time permitting - but if I put that kind of effort in I'll solve for a displacement of 601.5cc, thank you.  Oz Has a HUGE amount of work to do on something with 2X601.5cc before Spring (and Homecoming) | ||
| Oz666 |
BTW, What's that Pull Shock thing again? Oz | ||
| Newfie_buell |
I have no idea, BUT I'm sure that a Muffin could figure it out!!! Here in Newfoundland we eat FISH!!!!! hehehehe Isn't that kinda like a muffin!!!! | ||
| Newfie_buell |
For breakfast anyway | ||
| Iamike |
Blake, Back to seriousness. One thing that has puzzled me is why does the fuel efficiency of an engine go down in the winter? I can understand in a carbureted engine that the atomization isn't as good but injected engines lose too. I would think that the cold air is denser and would expand more when ignited and that should give better efficiency, not less. Our power plants spend an awful lot of effort cooling the steam back to water for the pressure needed to run a big generator. | ||
| Buellbozo |
I'm not sure, but.. Denser air means more molecules of o2 per given volume... More fuel molecules needed for stroiwatchacallit (ideal) mixture...  | ||
| Cochise |
waytaminnit, is this just another, I am Blake and am smart, thing??  |
