Pistons replace the valves?

[jmw]

An interesting engine concept here:

http://www.new4stroke.com/

JMW

http://www.ViscoAnalyser.com

 

[jmw]

The inventor cites this as his source of inspiration...

http://pivotalengine.com/news.html

JMW

http://www.ViscoAnalyser.com

 

[yoshimitsuspeed]

How is that better than cams and valves?
In the first link they try to make it sound more simple but I don't see how having a crank, rods, rod bearing, pistons, wrist pins, and rings both above and below the port is simpler than a cam, bucket, valve, guide and seal.
Not only that but it reduces the potential for modifying lift and duration.
I'm waiting to see solenoid,pneumatic or hydraulic valves with independent computer control on lift and duration.

 

[HRHtex]

Yoshi-etc. I am inclined to agree with you - but at least this engine probably could be made to run - unlike just about all the other "new" engine ideas on the internet.

On the subject of solenoid etc. computer controlled valves - the all-mechanical Helical Camshaft system can basically do everything a camless system can do - but it seems to have become lost in the maze of valve and engine ideas that people are continually putting forward - the vast majority of which are not even vaguely viable.

 

[frankydevaere]

I'm interested in a fourtstroke with no valves at all, but by means of gates.

 

[patprimmer]

Well then they would be gate valves would they not.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[malbeare]

this may be old but it still goes
malbeare


A tidy mind not intelligent as it ignors the random opportunities of total chaos. Thats my excuse anyway
Malbeare
www.sixstroke.com

 

[LionelHutz]

Quoted from the website;

"The First prototype of similar construction, was built in 1979."

Any it has yet to catch on???

Still, I agree that it could be made to work. The valves are simply an uside down crank after all as claimed on the site. Still, I wonder how the prototype got around the problem of the valves filling with oil? Maybe it didn't?

 

[Murec]

It seems to me like a variation of the desmodromic valves - nothing new here.
Gates instead of valves - tried that too (Knight sleeve valve engine)
For electronic-hydraulic valves try Fiat's Multi-Air engines