Springless valvetrain
Springless valvetrain Has anyone seen this, know anything about it?
http://www.decuirenginetechnologies....glessvalve.php
http://www.decuirenginetechnologies....glessvalve.php
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Joined: Jan 2005
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From: Orlaanndoooo
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wow no kidding, but here is the deal.
the spring is also what pushes the valve and the rocker arm back to the normal position as well as keeping the lifter on the cam and the pushrod in the lifter pocket by keeping pressure on the rocker arm. so what pushes this back to its normal position?
the spring is also what pushes the valve and the rocker arm back to the normal position as well as keeping the lifter on the cam and the pushrod in the lifter pocket by keeping pressure on the rocker arm. so what pushes this back to its normal position?
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The european car makers are using a soleniod mounted on top of the valve to open and close the valves. Makes for infinate "cam" timing and duration. Also less rotating mass. DOD is a breeze when you can just crack open the exhaust valve and shut off the fuel and spark. 
From what I saw in the video the lobe has a grove machined into the side and a tab sets in that grove. As the lobe rotates the tab follow in the track converting orbital rotation into linear movement in the vlavetrain.
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Think of it like a modern 2D (back and forth, up and down) roller coaster. The steel roller coaster track is the arm on the pushrod and the coaster wheels (on top and bottom of the track) are the groove in the cam lobe. The roller coaster cart cannot deviate either up or down from the track, and that's why they advertise that it eliminates valve float.
Hopefully someone with much more valvetrain experience can give a more thorough discussion on valve float with current technology. It seems much less of an issue than in previous times.
Any proof of this? I haven't kept up completely, but I am unaware of any actually in production.
The Coates design is very interesting, but has had a lot of trouble from what I have read.
For awesome digital valve actuation technology: www.sturmanindustries.com
For awesome digital valve actuation technology: www.sturmanindustries.com
Last edited by 1CAMWNDR; Jan 26, 2009 at 01:18 PM.
I'm calling BS.
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there have been lots of people trying to develop camless engines. lotus has done a few i think..
i think penumatic springs would be the best bet to start with. they are pretty well tested. its just getting them and packaging them.
electronic vavle actuation would be the best solution. i think Lotus again have tried to do this. however you require 72+volt electronics and it would require a major rethink on automotive electronics.
def intresting times though.
Chris.
i think penumatic springs would be the best bet to start with. they are pretty well tested. its just getting them and packaging them.
electronic vavle actuation would be the best solution. i think Lotus again have tried to do this. however you require 72+volt electronics and it would require a major rethink on automotive electronics.
def intresting times though.
Chris.
