Re: Talk about lack of low end torque!....

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Re: Talk about lack of low end torque!.... Posted by JimBlake [Email]

(#141)

[Profile/Gallery] (more from JimBlake) on Fri, 28 Jan 2005 14:25:41

In Reply to: Talk about lack of low end torque!...., Mike Lynch

[Profile/Gallery] , Fri, 28 Jan 2005 12:43:37 Members do not see ads below this line. - Help Keep This Site Online - Signup

It's kind of a silly consequence of the math.

Power = torque * rpm / 5252
(assuming you wanna use lbf-ft & horsepower)

So take a type of engine that likes to spin at 25,000 rpm. Say you need 200 horsepower, that means you want *only* 42 lbf-ft of torque. What's wrong with that?

But you need lots of reduction gearing. If you pick the wrong kind of transmission, you're setting it up to get a bad reputation from people who expect it to mimic the behavoir of some other kind of engine.

It's all a matter of expectations. Our beloved Saab turbo engines don't make much torque between 4 & 10 rpm. Nobody complains about that, & compares them against electric motors (which often don't need any kind of gearbox at all).

posted by 68.73.7...

Posts in this Thread:

Who makes the best engines?, J, Thu, 27 Jan 2005 12:13:25
- Best bang for the buck........, mcnasty, Sat, 29 Jan 2005 05:40:02
- Re: Rolls Royce?, t_mokes, Fri, 28 Jan 2005 15:02:21
- How does it compare to who makes the most?, Mike Lynch , Fri, 28 Jan 2005 12:48:12
- What?!? No vote for the Hemi?, J, Fri, 28 Jan 2005 08:30:32
  - Dude!, Eiron, Fri, 28 Jan 2005 12:46:00
    - Work is great. Social is not so good, though ..., J, Fri, 28 Jan 2005 13:04:51
- Pow Pow Powerwheels, TheKillerPenguin, Thu, 27 Jan 2005 20:15:23
- Re: Who makes the best engines?, Spiros Trianta, Thu, 27 Jan 2005 19:07:25
  - Why aren't there turbine motors for street use?, Brian_in_MA, Fri, 28 Jan 2005 06:30:53
    - Cost, cost, and, well, cost, Ari , Fri, 28 Jan 2005 06:56:10
      - thermal efficiency, too, JimBlake , Fri, 28 Jan 2005 08:41:52
        Talk about lack of low end torque!...., Mike Lynch , Fri, 28 Jan 2005 12:43:37
        Re: Talk about lack of low end torque!...., JimBlake , Fri, 28 Jan 2005 14:25:41 <-- Viewing This Message
        Electrics, max torque at zero....., Mike Lynch , Fri, 28 Jan 2005 16:17:03
        Re: Electrics, max torque at zero....., Spiros Trianta, Sat, 29 Jan 2005 13:32:05
- What about the GM LSx series, Steve88SiS, Thu, 27 Jan 2005 18:49:28
  - mileage, matt 94 aero, Thu, 27 Jan 2005 21:02:41
- Re: Who makes the best engines?, Steve in Chicago, Thu, 27 Jan 2005 18:15:26
- Re: Who makes the best engines?, danny1940, Thu, 27 Jan 2005 17:44:31
- Nissan Twin Turbo inline-6 ;) (skyline) NM, Trev, Thu, 27 Jan 2005 15:43:46
- Depends on how you define "best.", Noel, Thu, 27 Jan 2005 15:28:00
- GM's 3800 is my favorite..., jimtimkim, Thu, 27 Jan 2005 13:51:16
  - It is blown..., bazil burns, Thu, 27 Jan 2005 16:50:52
    - I had one, (sort of), Finch, Thu, 27 Jan 2005 18:26:20
      - Well, it is a 60's design IIRC..., bazil burns, Fri, 28 Jan 2005 03:41:46
- Re: Who makes the best engines?, Dean, Thu, 27 Jan 2005 13:49:53
- Re: Who makes the best engines?, yeppie, Thu, 27 Jan 2005 13:45:07
- Re: Who makes the best engines?, GM, Thu, 27 Jan 2005 13:24:04
  - the RPM for peak torque is what matters, compaqted, Fri, 28 Jan 2005 05:29:37
  - misconception, jeff, Thu, 27 Jan 2005 13:42:42
    - torque is still a lousy metric, nt moore, Thu, 27 Jan 2005 21:51:35
      - you need both, jeff, Fri, 28 Jan 2005 05:00:29
      - Passat TDI, nt moore, Thu, 27 Jan 2005 22:00:15
    - Re: misconception, GM, Thu, 27 Jan 2005 20:04:30
      - I drove a WRX..., Bob M, Fri, 28 Jan 2005 05:59:00
- Saab, of course n/m, code08, Thu, 27 Jan 2005 13:21:06
- Honda, jeff, Thu, 27 Jan 2005 13:16:56
  - Second Honda, Pat Hurley, Thu, 27 Jan 2005 15:13:01
    - Re: Third Honda, Aero'ed, Fri, 28 Jan 2005 09:28:40
- Not that any of us will ever be able to afford it ..., Urby, Thu, 27 Jan 2005 13:13:59
  - Rotary engines are great,, Finch, Thu, 27 Jan 2005 18:35:54
    - Good point about the oil--, Urby, Fri, 28 Jan 2005 06:42:30
  - Rotaries (Wankels) are not that new, been around since, Red Rocket, Thu, 27 Jan 2005 13:21:02

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