Search:

Type: Posts; User: RenM

Page 1 of 5 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    72
    Views
    53,261

    Well, i know the guy who does the videos rather...

    Well, i know the guy who does the videos rather well ;) and the videos are only chosen for being spectacular and not fast. Mild to no wheel spin is faster but very boring to watch. Thats also the...
  2. Replies
    72
    Views
    53,261

    Don't be ridiculous. Those starts are chosen for...

    Don't be ridiculous. Those starts are chosen for the Video, because they look more spectacular then a perfect start and this video does by no mean show an average of the FS starter field.



    ...
  3. Replies
    4
    Views
    3,247

    You have 2 parameters: - the air consumption of...

    You have 2 parameters:
    - the air consumption of the engine
    - the maximum restrictor air flow

    Air Consumption:
    For a naturally aspirated engine you can estimate a volumetric efficiency of 1. So...
  4. Replies
    188
    Views
    111,130

    Traction Control is not very fuel efficient with...

    Traction Control is not very fuel efficient with an engine that uses intake-manifold fuel injection. The only way to control the power output fast and reliable is by changing the ignition and thus...
  5. Thread: Ricardo Inputs

    by RenM
    Replies
    26
    Views
    14,755

    I am sorry, i really dont understand your...

    I am sorry, i really dont understand your question : "Also the goal is to find the engine RPM at initial turboshaft RPM "

    If you are running a static simulation the initial turboshaft rpm doesnt...
  6. Thread: Ricardo Inputs

    by RenM
    Replies
    26
    Views
    14,755

    You should really rethink your turbo matching. If...

    You should really rethink your turbo matching. If you don't need a wastegate, your turbine will be way to big to get a good transient response which is VERY VERY important in FSAE.

    Perhaps your...
  7. Thread: Ricardo Inputs

    by RenM
    Replies
    26
    Views
    14,755

    Hello Ritwik, 1) get the engines burn duration...

    Hello Ritwik,

    1) get the engines burn duration you need to run a pressure indication system and calculate the burn rate from the sensed pressure signal. This will however require a very expensive...
  8. Replies
    40
    Views
    18,593

    Okay i am trying to clear things up a bit. As...

    Okay i am trying to clear things up a bit.

    As apalrd said the IVC (intake valve closing) is the most important part of the cam timings and is very influential for cylinder filling for a naturally...
  9. Replies
    40
    Views
    18,593

    I would advise you to change cam timings first,...

    I would advise you to change cam timings first, because this can be done easily and has a big effect.
    Changing the duration of the cams without any calculations of the influence it has on your gas...
  10. Replies
    12
    Views
    16,563

    the average piston speed at 8,500 rpm is 18,9 m/s...

    the average piston speed at 8,500 rpm is 18,9 m/s so there should be room for higher rpms.
    increasing the compression ratio shouldn't be too difficult considering the relatively large stroke.
  11. Replies
    67
    Views
    45,113

    You obviously haven't been to FSG yet. There are...

    You obviously haven't been to FSG yet. There are enough fire extinguishers, run-off ares and more then enough bumps on the track ;)
  12. Replies
    14
    Views
    9,720

    Well there are very capable and small electric...

    Well there are very capable and small electric motors from hobby rc applications. The main problem i see here is the map of the compressor used. It only fits to way bigger engines.
  13. Replies
    14
    Views
    9,720

    people rule out superchargers as a viable option...

    people rule out superchargers as a viable option way to soon. Especially given the circumstances in FSAE.

    - Modern Superchargers do have a very good efficiency that is no worse then radial...
  14. Thread: AMG 595 Engine

    by RenM
    Replies
    13
    Views
    11,320

    wow, one of the few times that i have to say i...

    wow, one of the few times that i have to say i think Z is right (even though i would have build a different engine then him).

    The Mahle Engine was a good concept badly executed.
    The AMG Engine to...
  15. Thread: V-Twin

    by RenM
    Replies
    42
    Views
    32,482

    the burn rate is not an issue just as the heat...

    the burn rate is not an issue just as the heat transfer losses are no issue for a multi cylinder engine. Its just something that decreases your efficiency.

    With our 4 cylinder car, we can quickly...
  16. Thread: V-Twin

    by RenM
    Replies
    42
    Views
    32,482

    I dont think that the power to weight ratio of...

    I dont think that the power to weight ratio of the engine is very meaningful. Youd have to compare the power to overall weight (including driver) to get a real comparison:

    Driver weight: 70 kg,...
  17. Thread: V-Twin

    by RenM
    Replies
    42
    Views
    32,482

    You will get higher turbulence and thus a higher...

    You will get higher turbulence and thus a higher flame speed with a single compared to a four, especially as most 4 cylinder engines cylinder heads are optimised for a large filling rather then for...
  18. Thread: V-Twin

    by RenM
    Replies
    42
    Views
    32,482

    i am of course comparing a single na to a 4...

    i am of course comparing a single na to a 4 cylinder na.

    Thx for noting when the rant starts.

    I have no where argued that a car with a 1 cylinder engine is not competitive. Dont read anything...
  19. Thread: V-Twin

    by RenM
    Replies
    42
    Views
    32,482

    Wrong. With the air restrictor a single cylinder...

    Wrong. With the air restrictor a single cylinder na engine will never produce as much power as a 4 cylinder, due to the fact that you can not keep a constant pressure difference over the restrictor....
  20. Replies
    27
    Views
    31,203

    You seem to confuse quite a bit and i was not...

    You seem to confuse quite a bit and i was not specific enough.

    The decrease in density at the restrictor throat increases the volume flow rate at the restrictor throat. Thus the decrease in...
  21. Replies
    27
    Views
    31,203

    A decrease in density INcreases your volume flow...

    A decrease in density INcreases your volume flow for a given mass flow.
    With increased volume flow and fixed flow area the flow speed is increased.

    Increased flow speed means that choked flow is...
  22. Replies
    27
    Views
    31,203

    Your calculation is wrong. What you didnt...

    Your calculation is wrong. What you didnt consider is, that the density of the air decreases as the flow is accelerated through the nozzle (see Bernoulli). This increases the volume flow and flow...
  23. Replies
    15
    Views
    11,785

    a clever designed electric supercharger wont need...

    a clever designed electric supercharger wont need a lot of energy during an endurance. Depending on your boost pressure 3-5 kg in batteries will be more than enough.

    Your idea sounds nice in...
  24. Replies
    37
    Views
    33,395

    For most parts the processing costs are way...

    For most parts the processing costs are way higher then the material costs. So simply ignore the machining costs if its done inhouse is not a feasible away, as it would strongly penalize the teams...
  25. Replies
    37
    Views
    33,395

    It would be nice to have the real price of the...

    It would be nice to have the real price of the cars, but it will never happen. What about self machined parts? There are no invoices for that. And furthermore invoices can be "tweaked" too easily to...
Results 1 to 25 of 120
Page 1 of 5 1 2 3 4