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Old 11-04-2007, 04:57 AM   #1
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Default Car keeps revving forever video..

http://www.braptv.com/play.php?vid=101

i looked for a youtube thread but couldnt find one, sorry if i have posted in the wrong section, this car just keeps on revving and revving there is not end! Anyway cool vid i thought...

where is the video thread????
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Old 11-04-2007, 03:02 PM   #2
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Default Re: Car keeps revving forever video..

It's a rotary, they rev really high.
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Old 11-04-2007, 03:07 PM   #3
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Default Re: Car keeps revving forever video..

I <3 rotaries.
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Old 11-04-2007, 04:27 PM   #4
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Default Re: Car keeps revving forever video..

Then you'll love this:

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Old 11-04-2007, 05:06 PM   #5
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Default Re: Car keeps revving forever video..

Thats an awesome video, what RPM do you reckon he was gettin?
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Old 11-04-2007, 05:16 PM   #6
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Default Re: Car keeps revving forever video..

Quote:
Originally Posted by David Lindon View Post
Thats an awesome video, what RPM do you reckon he was gettin?
plenty
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Old 11-04-2007, 05:41 PM   #7
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Default Re: Car keeps revving forever video..

The first rotary engine was invented by a guy called Felix Wankel, a German engineer several others have made various spin-offs, [no pun intended!] years ago I became fascinated by these engines, & now I'm wondering that, if they are as efficient as they claim to be, why don't all cars have them??
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Old 11-04-2007, 06:27 PM   #8
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Default Re: Car keeps revving forever video..

They usually aren't very efficient motors, at least the older ones weren't.

My guess is 10K+ RPM.
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Old 11-05-2007, 12:37 AM   #9
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Default Re: Car keeps revving forever video..

if it were a four stroke, I think, the revvs are something like this.

25s: 5k
35s: 10k
44s: 12 k

that's judging by ear.
the sound at 35seconds is much the same as the sound generated just before I redline my bike at11k, (so about 10k).



to put it into perspective...

the 91 le mans winner was a wrankel (rotary) engine, it red lined at 9000 rpm.

that's average cruising engine speed when I'm on my bike, (and similar for my dads bike also). and I still have a few thousand revs to go before I red line the machine, (my dad bike has a few more thousand revs before redlining...

rotary engines are significantly different from regular otto engines (4 stroke otto has 1 combustion every 4 rotations,
rotary engines have a combustion every single rotation of the main shaft, (though this is geared up from 3 combustions for each rotation of the large rotor that compresses the fuel...
so it ounds like it's revving a lot higher, cause most of us are basing our perceptions on what an ordinary car sounds like.

it is possible to make a rotary engine that revs up to 20krpm, but that's pretty much the maximum from what I've been reading...
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Old 11-05-2007, 12:54 AM   #10
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Default Re: Car keeps revving forever video..

Quote:
Originally Posted by Brookfield View Post
The first rotary engine was invented by a guy called Felix Wankel, a German engineer several others have made various spin-offs, [no pun intended!] years ago I became fascinated by these engines, & now I'm wondering that, if they are as efficient as they claim to be, why don't all cars have them??
They are great because they have very little moving parts. However, they are not as "efficient" as standard piston engines I think. Primarily because of the way it's different. If you've ever seen the insides of them, they are basically triangular rotors which always have one side sealed off with a wall of the oval-shaped combustion chamber. The volume in the sealed part (where combustion takes place) is rather large, making for a low compression ratio. Also, the air and fuel don't have much room to mix in the combustion chamber, so you get worse emissions.

It is a good, simple, lightweight engine, but you need to rev it to insane levels to make decent power, which it happens to do quite well.

Here's an animation, click it and there's a whole page describing each part of the combustion process.
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