Another whats new is really old engine design
Another whats new is really old engine design
(OP)
I'm surprised there are no threads on the site about this engine.
http://pinnacle-engines.com/
Nothing came up on a search. So how come we haven't heard much about this?
http://pinnacle-engines.com/
Nothing came up on a search. So how come we haven't heard much about this?





RE: Another whats new is really old engine design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Another whats new is really old engine design
We haven't heard much about this because the world is awash with "revolutionary new engine technology" and there's only so much that the popular media can do to drum up enthusiasm and to differentiate between valid concepts and investor-money vaporware. The same things are promised as have been for every other variation of internal combustion engine-- more power, lower emissions, greater economy, etc. I wish them the best of luck, but we'll see if this ever becomes a production reality.
RE: Another whats new is really old engine design
Which feature is the step forward?
regards,
Dan T
RE: Another whats new is really old engine design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Another whats new is really old engine design
Start at ptfnasty.com if you are curious.
Mike Halloran
Pembroke Pines, FL, USA
RE: Another whats new is really old engine design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Another whats new is really old engine design
RE: Another whats new is really old engine design
I'm by no means a proponent of sleeve valve engines, Greg, but I think it's fair to say that they had a good innings in the very competitive field of reciprocating aero engines in the 40s and 50s. In terms of (take-off) power density per frontal area or mass, they were not uncompetitive with comparable poppet valve engines. BSFC is more difficult to pin down due to the multitude of confounding variables, but I believe they had a slight edge overall, in that regard, insofar as it is possible to make apples-to-apples comparisons. This is attributed to the higher mechanical compression ratios enjoyed by sleeve valve engines, which has in turn been attributed to either the absence of a hot exhaust valve as an uncontrolled source of ignition, or the superior swirl conditions in a sleeve valve chamber promoting faster combustion; either of which permit a higher knock-limited compression ratio, other things being equal.
And for the record, I see no chance of a revival of sleeve valves (in commercially viable reciprocating engines) anytime in the foreseeable future. Poppet valves and their supporting systems have received a prodigious amount of development since the demise of reciprocating (and hence sleeve-valve) engines in the first echelon of aviation power units, and the ground that would need to be made up by sleeve valves, to make good over 50 years of dormancy should be give serious pause, to anyone considering a sleeve valve development project, for commercial application.
For those interested, there is well written historical comparison of sleeve and poppet valve engines here.
"Schiefgehen will, was schiefgehen kann" - das Murphygesetz
RE: Another whats new is really old engine design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Another whats new is really old engine design
Thanks, Hemi.
Mike Halloran
Pembroke Pines, FL, USA
RE: Another whats new is really old engine design
For those into aero engines or aviation in general, Flight Magazine has posted a scanned archive of all their issues from 1909-1995. It is date range searchable on alpha numeric strings, so I have found many interesting articles by searching, for instance, on "Merlin" or "Griffin". I haven't had much success with multiple terms - I seem to get all the results for each term taken individually, instead of a narrowing of results. Have fun!
"Schiefgehen will, was schiefgehen kann" - das Murphygesetz
RE: Another whats new is really old engine design
- Steve