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Tractor Pulling Discussion Forum

camshaft-less valves

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Shane Falco

02-24-2005 06:35:14




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Recently saw some very modern engines at an auto show, and became very interested in their valvetrains, with the electronic timing and solenoids to open the valves. If I recall correctly, some of the International truck engines feature this. Does anyone have some information as to how all of this works, and if/how it could be implemented on other applications? Its got me thinking about it quite a bit, because without the cam, a guy could gain some outrageous cubes on the ole two lunger in a real hurry!

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Biohazard

02-24-2005 18:11:17




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 Re: camshaft-less valves in reply to Shane Falco, 02-24-2005 06:35:14  
I don't know if you have seen this before, but it would be interesting if the theory could be adapted on a larger scale. Basically, this guy removed the head off of a 4 stroke engine and replaced it with a headless 2 stroke short block mounted in an inverted position (so that the pistons oppose one another). Air/Fuel and exhaust enter/exit through the 2 stroke ports and the pistons do all the work - no more valves or camshaft. It is pretty cool.

here's the link. Link

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BushogPapa

02-25-2005 12:19:32




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 Re: camshaft-less valves in reply to Biohazard, 02-24-2005 18:11:17  
Remember the old "Fairbanks-Morse" Locomotives used an engine from WWII from Submarines... It had opposing pistons and 2 crankshafts..2-stroke diesel.. It was a very efficient engine...just a real pain to tear down.....!!!



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buickanddeere

02-24-2005 16:13:55




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 Re: camshaft-less valves in reply to Shane Falco, 02-24-2005 06:35:14  
Imagine the additional gains of the cam less valve train if there was some way to get the valve completely out of the port when it's open?



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LW

02-24-2005 18:30:56




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 Re: camshaft-less valves in reply to buickanddeere, 02-24-2005 16:13:55  
There is, I looked at a design that has patents pending currently that had a shaft with a hole through it when it lined up with the port the port was open when it turned out of the way it closed it was quite a path to the combustion chamber so the shaft took the place of all the valve train of course it was a dual overhead shaft engine, the biggest headache I thought were the ceramic seals on the shafts.

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buickanddeere

02-24-2005 19:18:48




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 Re: camshaft-less valves in reply to LW, 02-24-2005 18:30:56  
Sounds like the sleeve valves used on some WWII aircraft engines. They sealed better after a few hundred hours of operation.



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LW

02-25-2005 06:30:52




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 Re: camshaft-less valves in reply to buickanddeere, 02-24-2005 19:18:48  
The most unique operation on this design was the shutter(butterfly) on every port that was supposed to be a variable venturi affair to control the engine with a flat torque curve, I think they would have issues there, I always hope that coils and solenoids would develop to the point that they could control the valve and they are getting close to production now with the proper progam a engine could go from an idle to whatever on the high end and always be efficient with constant variables in valve duration ,overlap,timing etc.

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jd b puller

02-24-2005 15:10:26




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 Re: camshaft-less valves in reply to Shane Falco, 02-24-2005 06:35:14  
Back in college I thought of stroking my tractor and thought if I could just get rid of that pesky camshaft there would be more room in there. Thought about solenoids but didn't have the tech to actually figure it out (thought maybe pulsars and a couple control modules like on a deere 445 would work.)

When I was at Navistar (International Truck) back in 2000, they were looking at camless diesels. If I remember correctly, the problem that they were facing at the time was that the valves kept breaking because the solenoids let it come back to far. Not a gradual ramp like on a cam.

When I got to Nav and realized they had worked on it for 5 years or so and hadn't perfected it, I didn't feel so bad...

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G/MAN

02-24-2005 07:44:05




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 Re: camshaft-less valves in reply to Shane Falco, 02-24-2005 06:35:14  
I don't know about camless valves in International truck engines. But Navistar and Caterpillar both use HEUI (Hydraulically-actuated Electronically-controlled Unit Injection) in several models of engine. I don't know about the new 6.0 liter Powerjokes, but the 7.3s used it. The development of the HEUI was a joint-effort between Navistar and Caterpillar. The system uses an auxiliary pump to pressurize engine oil to 3000 psi (I think it's 3000, but it might have been more) and then uses electronic solenoids to control the oil flow to the plunger in the unit injector. Basically engine oil pumps the fuel into the engine. And I have heard that similar setups are being used to operate valves, but I don't know if it's made it into production yet. Camless engines are nothing new. Tucker used a camles engine in his cars back in the day.

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superih

02-24-2005 10:36:01




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 Re: camshaft-less valves in reply to G/MAN, 02-24-2005 07:44:05  
International (Navistar) has been doing alot of development on solenoid actuated valves. I read in I believe the powerstroke registry magazine that International was hoping to have it in production by 2007 in there medium duty trucks. I also know that Ford is putting a new 6.7 liter powerstoke into service in 2007 also so it may be a camless engine. The real benifit is the unlimited vavle sequencing profile. Cat had a camless engine at Ferris State University around 1998. There was no torque curve to the engine. Torque was maxed out just off of idle to redline rpm"s.

LC

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