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ddgonzal
Re: A16 - Concept
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Quote:
why does a engines hp curve drop but keeps reeving ?
The HP drops when overrevved because the cam is tuned for a certain RPM range. That means the air charge is started (intake valve opens) before the piston is at Top Dead Center in order to give the slug of air time to start moving. By the time the air gets moving the piston is starting to move down

Now when you overrev it, there is no longer enough lead time to draw in a full charge, so HP drops. It's all in the timing. The stock 6000 RPM cam has this timing:

Intake opens at: 14 degrees BTDC
Intake closes at: 54 degrees ABDC


The 6400 RPM cam (GX cam) opens the valve even sooner (6 degrees earlier)

Posted on: 2018/8/17 11:04
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Subject Poster Date
     A16 - Concept lamb_daiquiri 2013/9/18 9:34
       Re: A16 - Concept Anonymous 2013/9/18 10:31
       Re: A16 - Concept ddgonzal 2013/9/18 10:43
       Re: A16 - Concept lamb_daiquiri 2013/9/18 10:46
       Re: A16 - Concept D 2013/9/18 14:50
       Re: A16 - Concept jmac 2013/9/20 10:57
       Re: A16 - Concept Dazza93 2018/6/4 0:34
         Re: A16 - Concept D 2018/6/4 4:08
           Re: A16 - Concept Datmado 2018/6/4 8:40
       Re: A16 - Concept nismo1 2018/6/4 18:06
       Re: A16 - Concept lamb_daiquiri 2018/6/5 12:30
       Re: A16 - Concept D 2018/6/7 13:44
       Re: A16 - Concept coxsteve 2018/6/16 1:29
         Re: A16 - Concept D 2018/6/16 4:51
       Re: A16 - Concept Rallytwit 2018/6/16 5:34
       Re: A16 - Concept D 2018/6/16 17:43
       Re: A16 - Concept Volodkovich 2018/6/17 23:55
       Re: A16 - Concept Rallytwit 2018/6/18 3:30
         Re: A16 - Concept nickmitty 2018/6/18 8:22
           Re: A16 - Concept D 2018/6/18 14:51
       Re: A16 - Concept nickmitty 2018/6/18 16:00
       Re: A16 - Concept D 2018/6/18 16:51
         Re: A16 - Concept nickmitty 2018/6/18 17:49
       Re: A16 - Concept Rallytwit 2018/6/19 5:30
         Re: A16 - Concept D 2018/6/19 7:05
       Re: A16 - Concept Rallytwit 2018/6/20 1:54
         Re: A16 - Concept ddgonzal 2018/6/20 4:01
       Re: A16 - Concept D 2018/6/20 12:15
         Re: A16 - Concept D 2018/8/6 12:49
           Re: A16 - Concept benny 2018/8/7 3:02
       Re: A16 - Concept benny 2018/6/20 12:20
         Re: A16 - Concept nickmitty 2018/6/20 13:39
       Re: A16 - Concept Rallytwit 2018/8/7 2:29
         Re: A16 - Concept benny 2018/8/7 2:53
       Re: A16 - Concept Rallytwit 2018/8/7 5:08
         Re: A16 - Concept Rallytwit 2018/8/8 5:17
           Re: A16 - Concept D 2018/8/8 8:26
             Re: A16 - Concept nickmitty 2018/8/8 13:34
               Re: A16 - Concept benny 2018/8/9 1:27
               Re: A16 - Concept benny 2018/8/9 2:21
       Re: A16 - Concept nickmitty 2018/8/7 13:56
       Re: A16 - Concept D 2018/8/7 15:50
         Re: A16 - Concept nickmitty 2018/8/7 16:33
         Re: A16 - Concept benny 2018/8/8 4:44
       Re: A16 - Concept Rallytwit 2018/8/9 2:54
         Re: A16 - Concept D 2018/8/9 4:13
           Re: A16 - Concept nickmitty 2018/8/9 5:26
             Re: A16 - Concept ddgonzal 2018/8/9 11:06
             Re: A16 - Concept ddgonzal 2018/8/17 11:04




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