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Old 01-27-2007, 11:26 PM   #1
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Origin of VTEC...NO JOKE !!!

I was at the National air and space museum today and was looking at the aircraft engines. I discovered this engine developed at the end of WWII and it had a dual cam arrangement much like VTEC. It used one cam for powerful take off, and the other was for low fuel consumption in level flight. I had a good laugh about it. Here are the pics.

Here is a thread with a little more detail.

http://www.pilotfriend.com/aero_engines/aero_xr7755.htm


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Origin of VTEC...NO JOKE !!!-vtec1.jpg  

Origin of VTEC...NO JOKE !!!-vtec2.jpg  

Origin of VTEC...NO JOKE !!!-vtec3.jpg  

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Old 01-27-2007, 11:40 PM   #2
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WoW... that is pretty cool. Awsome find.
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Old 01-28-2007, 02:16 AM   #3
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We'll I'd say that any engine that is developed or copied from an aircraft engine is a good engine. Because aircraft engines are really made to withstand lot of force, punches and abuse.
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Old 01-28-2007, 07:41 AM   #4
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Aircraft engines were the leaders of the car industry. Same goes for turbochargers, superchargers, and nitrous. Even the V-Twin engine in Harleys.
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Old 01-28-2007, 01:37 PM   #5
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Quote:
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Aircraft engines were the leaders of the car industry. Same goes for turbochargers, superchargers, and nitrous. Even the V-Twin engine in Harleys.
Broadening things beyond engines a little... I'm not 100% sure but I believe you can say the same about disc brakes.
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Old 01-29-2007, 02:10 AM   #6
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That's pretty cool. It's amazing to think about whe some technological advances happened. I think Dusenberg or somebody invented the DOHC in like the 20s.. Crazy. (off subject: I'm still amazed every time i fly. it's just so wierd to me to be in this thing that's way bigger than a bus and hauling @$$ up to 35000 feet)
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Old 01-29-2007, 09:55 AM   #7
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Quote:
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Aircraft engines were the leaders of the car industry. Same goes for turbochargers, superchargers, and nitrous. Even the V-Twin engine in Harleys.
Oh I agree ^^^. That is where the money and the technology always have been.

If you look at history, nothing is really new. It has just been refined so it works better. Water cooling in 1912, 4 valve heads on race bikes in the teens, etc etc etc. It has all been done, it is now just refined to the point where it is reliable AND affordable.
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Old 01-29-2007, 10:10 AM   #8
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Quote:
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Aircraft engines were the leaders of the car industry. Same goes for turbochargers, superchargers, and nitrous. Even the V-Twin engine in Harleys.
Harley invented the V-twin, they wanted more power in a small package.

some car manfactures made planes before cars or vica versa, sabb comes to mind and some smaller eurpoen car companines made planes too.

superchargers have been around since the old radial engines on airplanes, there are the ones you see on onld war planes that form a circle, they had a superchanger section the help create more power becaue of the size of the engine it created a pretty big hole in the air and neede more power to push thru the air at a decent speed.

and a jet engine is really one big superchanger, in the world of avaition the way a jet works is kinda like this

Suck- suck air into the inlet typically called the fan section

Squeeze- the air is compressed in the section where the rotors move or the first turbine section

Bang- this is the section where the compressed air is burned, there are many ways this can be desgined, but once jets get spooled up and fuel is injected no spark is needed to keep it running.

Blow- this is the exaust section with more fins and is attached to the turbine which drives the front turbine in in the squeeze section.

the lycoming engine in the cessna 172 i fly is a 160 hp opposed engine, meaning the clynders sit flat 2 on a side, with one cam in the center of the crankcase, with a pushrod desgin.
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Old 01-30-2007, 10:19 PM   #9
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like a subaru boxer? but with one cam? interesting
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Old 01-30-2007, 10:23 PM   #10
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some small kit planes use subie boxer motors
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