Sporting Fiats Club
Sporting Fiats Club
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 News Club and General Topics
 General Gassing
 Zero Camshaft Fiats
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

s130
Net Member

348 Posts

Posted - 19 May 2016 :  19:25:53  Show Profile  Reply with Quote
?

Edited by - s130 on 18 Mar 2017 18:43:26

sumplug
Moderator

Spain
5861 Posts

Posted - 20 May 2016 :  08:43:46  Show Profile  Click to see sumplug's MSN Messenger address  Reply with Quote
Having no camshafts reduces the weight and size of the engine, considerably. It allows a huge range of ignition, and fuel permutations to take place. By a simple switch, you can have super economy, to track use for example.
Various ways have been tried, from electro magnets, to compressed air. Indeed, Fiat, Lotus, and BMW lead the field in it. I predict a camless engine in the near future, as the ever increasing urge to reduce emissions to zero looms.

Andy

Jeep Grand Cherokee 2.7CRD.
Maskerati 4200 Cabriocorsa.
Lancia Delta Mk 2
Go to Top of Page

julian
Forum Admin

United Kingdom
3705 Posts

Posted - 20 May 2016 :  10:04:24  Show Profile  Visit julian's Homepage  Click to see julian's MSN Messenger address  Reply with Quote
There is still a long way to go. I've seen plenty of attempts and the Fiat multiair is by far the closest real world application but it controls hydraulic pressure to close the valves rather than open them (although it can do that at low revs which suggests this is a pressure/flow limitation of the design). The multiair design raises a lot of questions and "why have a camshaft at all?" is the least of them. "Why only control one side?" is the starting point. Either there is nothing to be gained in modulating the other side (hence 3 lobes per cylinder on a single camshaft) or the design simply doesn't permit it. Whether this is a limitation of the oil system, hydraulic components or the engine in general is something I'd love to know mostly because it has a big impact on what can be achieved for tuning the engine. I suspect the issue is that it a matter of diminishing returns - the current design is a sweet spot with any improvements making little impact on performance or efficiency.

Mercedes have shown you don't need any of this to make an immense improvement in efficiency although it does beg the question of what could be achieved with both sides of the bargain - Fiats multiair and Mercedes' compound charging. The result should (in dreamland perhaps) be a superbly efficient and versatile engine with unbeatable efficiency for an ICE.

2009 Abarth 500
Go to Top of Page

fostertom
Net Member

United Kingdom
987 Posts

Posted - 21 May 2016 :  20:44:13  Show Profile  Visit fostertom's Homepage  Reply with Quote
Would absence of camshaft(s), belts etc save a lot of power loss? Or would electric drain on alternator, or hydraulic pressure pump etc soak up just as much?
Go to Top of Page

sumplug
Moderator

Spain
5861 Posts

Posted - 22 May 2016 :  10:09:01  Show Profile  Click to see sumplug's MSN Messenger address  Reply with Quote
We should have a camless, and beltless engine. All ancillaries, direct drive. Why can't the water pump and aircon pump, be one unit? And use poppet valves, as on motorbike engines. There are so many advances, the IC engine can gain. Just needs someone to hold the torch and run with it!

Andy

Jeep Grand Cherokee 2.7CRD.
Maskerati 4200 Cabriocorsa.
Lancia Delta Mk 2
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Sporting Fiats Club © 2003-2011 Sporting Fiats Club Go To Top Of Page
Snitz Forums 2000