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Camshaft Tech

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Old May 11, 2005 | 01:49 PM
  #31  
markinkc69z's Avatar
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From: Shawnee Kansas
Re: Camshaft Tech

I'm surprised the aftermarket hasn't designed the lenco rotary. Just keep tacking on sections that spline into each other with individual throttle bodies and buzz her to 12,000. Heck you might not even need a driveshaft. Tack a lenco on to your lencoish rotary and spline it to the rearend.

Ok, I'm better now.
Old May 12, 2005 | 01:39 PM
  #32  
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Re: Camshaft Tech

It gets better... he claimed he ordered a Spintron so he could find out for himself. He quoted the motor current requirements as 41 Amps at 440 Volts, so I sunk another nail in his coffin by posting...

Just FYI...

Power (Watts) = Volts * Amperes
P = 440 * 41
P = 18,040

Horsepower = Watts * 0.00134
Horsepower = 18,040 * 0.00134
Horsepower = 24.1736

Torque = Horsepower * 5,252 / RPM
Torque = 24.1736 * 5,252 / 8,500 RPM
Torque = 14.9 lb-ft.
He then conceded defeat.

So now (same thread) we've got a guy arguing that an "all-bore" 427 will produce more power than a "stroked" 427 (I just referred him to the recent Hot Rod article) because "Michael K. Anderson, EGM, Engine Analysis, Performance, & CFD, General Motors", said that bore determines power potential. What Michael K. Anderson actually said (from the excerpt he posted) was that "Bore fundamentally sets the area through which fresh charge can enter the cylinder and as such plays a key role in setting the power capacity of an engine at a given level of technology", which was incorrectly interpreted by said idiot.

He then provided a graph from the Anderson lecture showing that three engines with bores of 78, 90, and 102 mm all produced roughly the same power output with strokes of 70, 90, and 100mm. I mentioned that this would be the case if the engines with larger displacements were forced to breath through the induction system of the smallest, but that if the induction setup were optimized for the largest of the three engines, you'd see varying peak power outputs (as you'd expect) with the largest producing the most peak power, and that displacement ultimately determines peak power output. He claims the graph is still proof that an all-bore 427 would make more power than a stroked 427. I don't know why I bother.

Originally Posted by markinkc69z
I'm surprised the aftermarket hasn't designed the lenco rotary. Just keep tacking on sections that spline into each other with individual throttle bodies and buzz her to 12,000.
That's the basic principle behind the 13G and 20B 3-rotor engines and the 26B 4-rotor engine. Just keep adding rotors and housings, and join a couple eccentric shafts together.

The 26Bs in the 1991 Mazda 787B Le Mans cars (the only year that Mazda won, but you'd think it indisputably proved the rotary engine superior to any other type of internal combustion engine to hear the rotary zealots tell it...) produced ~700 horsepower naturally aspirated with a variable length intake runners. And got about 2 mpg...

http://www.scuderiaciriani.com/rx7/787B/26b_large.jpg
Old May 12, 2005 | 02:40 PM
  #33  
SStrokerAce's Avatar
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Re: Camshaft Tech

26B.... yeah not that the chassis and the rest of the car had to do anything with that at all, they just had one of the best chassis designers do that for them. That car would have worked with any small lightweight 700hp motor.

Watch out for the Diesels here soon at Lemans.... They will win for the same reasons, big gaps in the rules that favor certain engine types.

Bret
Old May 12, 2005 | 03:43 PM
  #34  
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From: Upstate NY
Re: Camshaft Tech

Originally Posted by jimlab
It gets better... he claimed he ordered a Spintron so he could find out for himself. He quoted the motor current requirements as 41 Amps at 440 Volts, so I sunk another nail in his coffin by posting...

He then conceded defeat.
Here's the link he used. Sorry I didn't post it earlier. I didn't have to order a SpinTron just to get the specs.

http://spintron.com/options.htm

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