Camless Engines
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Does anyone think this is a possible wave of the future, sure is about time to do some redesigning.
http://www.gizmag.com/qoros-qamfree-camless-engine/43045/
http://www.gizmag.com/qoros-qamfree-camless-engine/43045/
- Keepaeyeonit
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Yes,I saw a prototype 10+ years ago but I think the technology wasn't there yet but we will see this in the near future. My injectors in my diesel are fired with high pressure oil and a electric coil( without fail in 364,000 miles) so why couldn't it be done to open a valve? Just give it time .
- Sunny Boy
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Interesting. Thanks for posting that, Sam.
I see no reason why electronic controlled valves can't replace cam controlled valve train systems. Just like electronic fuel injection replaced mechanical fuel injection and carburetors.
Paul
I see no reason why electronic controlled valves can't replace cam controlled valve train systems. Just like electronic fuel injection replaced mechanical fuel injection and carburetors.
Paul
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F1 engines have used this tech before and may be using it now.
Race on Sunday, sell on Monday
Race on Sunday, sell on Monday
- coaledsweat
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It has been around for the last 20 years.
- lsayre
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The old (1950's era) Mercedes F1 technology called the Desmodromic Valve accomplished zero valve float with no need for electronics, pnuematics, or hydraulics. Current F1 (Formula One) cars use pneumatic valves to my knowledge.
Current Ducatti motorcycles have resurrected the Desmodromic Valve.
Current Ducatti motorcycles have resurrected the Desmodromic Valve.
- Sunny Boy
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Don't confuse what happens at high RPMs with race engines with what happens in a production vehicle engine at normal operating speeds. It's not an apples to oranges thing. Your every day vehicle engine tops out where some mild race engines are just waking up.
Mechanical camshafts are a compromise of low, mid, and high rpm range performance. For best performance you only get to pick one of the three. For anyone who has been able to compare stock, "street race" and "full race" cams , they will know that mechanical camshafts work best within a fairly narrow rpm range. The rest of the operating range is, so-so.
Like with carbs verse electronic fuel injection, the plus with electronically actuated valves is they can be computer controlled fine-tuned to opening time, duration, and overlap at all rpm's, load conditions, and altitude, to get the best performance , economy, and pollution control than a mechanical camshaft ever could.
Paul
Mechanical camshafts are a compromise of low, mid, and high rpm range performance. For best performance you only get to pick one of the three. For anyone who has been able to compare stock, "street race" and "full race" cams , they will know that mechanical camshafts work best within a fairly narrow rpm range. The rest of the operating range is, so-so.
Like with carbs verse electronic fuel injection, the plus with electronically actuated valves is they can be computer controlled fine-tuned to opening time, duration, and overlap at all rpm's, load conditions, and altitude, to get the best performance , economy, and pollution control than a mechanical camshaft ever could.
Paul
- davidmcbeth3
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I just took my engine apart .. it has values.
Now what do I do with all these extra parts I found?
Now what do I do with all these extra parts I found?
- coaledsweat
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Lawn art!davidmcbeth3 wrote:I just took my engine apart .. it has values.
Now what do I do with all these extra parts I found?
- Lightning
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Wow, very interesting to have this topic come up. Very interesting because I thought I had blown the engine in my lawn mower. Turns out that the rocker arm bolt loosened up allowing the rods on one cylinder to come out of place and bent them all to hell. I replaced the rods and it runs great. I almost bought the used cub cadet down the road for $2000. The new rods were only $13.04
Here's the thread I started over on tractorbynet if anyone wants to see pictures.
http://www.tractorbynet.com/forums/john-deere-lawn-garden/356978-john-deere-l120-briggs-stratton.html
Anyways. I got looking at all these moving parts and thought about all the energy they require to be thrust to and fro with respect to inertia and momentum and thought geez, seems like there would be a better way to do that. Same goes for pistons and rods. It must use a lot of the engines gross power to move all the parts back and forth. Why didn't the rotary engine succeed the traditional piston engines?
Here's the thread I started over on tractorbynet if anyone wants to see pictures.
http://www.tractorbynet.com/forums/john-deere-lawn-garden/356978-john-deere-l120-briggs-stratton.html
Anyways. I got looking at all these moving parts and thought about all the energy they require to be thrust to and fro with respect to inertia and momentum and thought geez, seems like there would be a better way to do that. Same goes for pistons and rods. It must use a lot of the engines gross power to move all the parts back and forth. Why didn't the rotary engine succeed the traditional piston engines?
- Keepaeyeonit
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I forgot to mention what Sunny Boy said, there is infinite adjustment with that kind of system( just like fuel injection ) the computer can make It whatever it needs it too be for any situation, and yes Lee less moving parts can be a good thing as long as there the right ones .
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When you put that bolt/stud back in the head throw a drop of blue Loc-tite on it. Then you won't have the problem again.Lightning wrote:Wow, very interesting to have this topic come up. Very interesting because I thought I had blown the engine in my lawn mower. Turns out that the rocker arm bolt loosened up allowing the rods on one cylinder to come out of place and bent them all to hell. I replaced the rods and it runs great. I almost bought the used cub cadet down the road for $2000. The new rods were only $13.04
Here's the thread I started over on tractorbynet if anyone wants to see pictures.
http://www.tractorbynet.com/forums/john-deere-lawn-garden/356978-john-deere-l120-briggs-stratton.html
Anyways. I got looking at all these moving parts and thought about all the energy they require to be thrust to and fro with respect to inertia and momentum and thought geez, seems like there would be a better way to do that. Same goes for pistons and rods. It must use a lot of the engines gross power to move all the parts back and forth. Why didn't the rotary engine succeed the traditional piston engines?
As for the rotary engine, I think it's due to emissions more than likely.