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Author Topic: 6 stroke engine  (Read 5967 times)

6 stroke engine
on: March 31, 2006, 16:06:13 PM
Props to Skidzilla for turning us on to the site.

http://www.damninteresting.com/?p=467#more-467

Very simple concept, at the end of the normal exhaust stroke, a tiny bit of water is injected into the already hot cylinder, where it immediately expands, creating another power stroke from the heat that is otherwise wasted.

:thumbup:

On another note, the external combustion engine:
http://uncyclopedia.org/wiki/External_combustion_engine
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  • Offline madmax

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Re:6 stroke engine
Reply #1 on: March 31, 2006, 16:37:23 PM
gonna be intresting if that ever takes off,
only problem i can see is making the two tank inlets different enough to make  half asleep people not fill up the petrol tank with water and vice versa.

that and stainless steel exhausts would probably have to become the norm...

steam = water, water + normal steel = rust
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6 stroke engine
Reply #2 on: March 31, 2006, 16:44:16 PM
You should be able to collect water from the exhaust, where it is steam distilled, steam comes out regular exhaust as well.

Biggest problem is oil contamination, tbh, but the amount of water needed to provide power would be very small. Just keep your rings in good condition. :P
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  • Offline Chris

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6 stroke engine
Reply #3 on: March 31, 2006, 17:48:05 PM
but water is stupidly dense, at 1kg per litre... its heavy stuff!

And it will freeze, meaning that additives are necessary, which might leave deposits...  Still needs a lot of work before it will be commercially viable, methinks.
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  • Offline Pete

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Re:6 stroke engine
Reply #4 on: March 31, 2006, 17:52:38 PM
Cooler engine = richer mixture required, still its a nice bit of engineering :)

Cool website too  :thumbup:
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  • Offline Serious

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6 stroke engine
Reply #5 on: March 31, 2006, 18:18:26 PM
Quote from: Chris
but water is stupidly dense, at 1kg per litre... its heavy stuff!

And it will freeze, meaning that additives are necessary, which might leave deposits...  Still needs a lot of work before it will be commercially viable, methinks.


Water may have a greater mass but you save almost as much fuel so for a driver who wants economy it may be preferential. As for additives providing you choose the right ones it should be OK but I suspect a lot of work will have to be done on this, same with deciding on the materials for the engine.
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  • Offline Chris

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Re:6 stroke engine
Reply #6 on: March 31, 2006, 20:40:27 PM
Quote from: sdp
Cooler engine = richer mixture required, still its a nice bit of engineering :)

Cool website too  :thumbup:


it could be possible to only run the "6 stroke" cycle when it is running hot, perhaps while idling in traffic etc... and as the article says it reduces  (if not eliminates) the need for water cooling in the block and head.
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6 stroke engine
Reply #7 on: March 31, 2006, 22:15:10 PM
that link says bit 18 wheeler lorries have radiators that weigh 1000lb..... wtf?

454kg ? almost half a tonne ?

BS ! :p
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  • Offline Serious

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Re:6 stroke engine
Reply #8 on: March 31, 2006, 23:32:58 PM
Quote from: sdp
Cooler engine = richer mixture required,


Does it?

Quote from: Chris
Quote from: sdp
Cooler engine = richer mixture required, still its a nice bit of engineering :)

Cool website too  :thumbup:


it could be possible to only run the "6 stroke" cycle when it is running hot, perhaps while idling in traffic etc... and as the article says it reduces  (if not eliminates) the need for water cooling in the block and head.


Its quite possible to run car engines without any water cooling at all if you use an air cooled design like in the Volkswagen Kubelwagen or 2CV, works even in the desert.
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6 stroke engine
Reply #9 on: March 31, 2006, 23:42:09 PM
Thats not the point, the point is redirecting otherwise lost energy into engine power.
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6 stroke engine
Reply #10 on: April 01, 2006, 00:12:51 AM
Very very good idea, but why not make it a hemi and have three valves per cylinder:

1- inlet
2- gas exhaust
3- water exhaust

then use the redundant water pump to flow the water back into the tank, therefore reducing the number of fill-ups of water?
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  • Offline madmax

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Re:6 stroke engine
Reply #11 on: April 01, 2006, 01:46:19 AM
problem is with the heat you have to extract from the steam before you can shove it back into the cylender.


water evaporates and takes in heat, to recondese it lets out heat....
so you end up running a radiator and fan arrangement on the recirculated water..... maybe something more elaborate even.

square one anyone?  :lol:




with the 6 stroke setup, woulda thought youd have to run a few fully fuel cycles before it warms up enough to start hitting the water cycles.


oh the colder engine = richer mixture, i dont think is quite right.
colder air = denser air = more oxygen in the cylender for combustion.
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  • Offline Serious

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Re:6 stroke engine
Reply #12 on: April 01, 2006, 02:13:41 AM
Quote from: madmax
problem is with the heat you have to extract from the steam before you can shove it back into the cylender.


water evaporates and takes in heat, to recondese it lets out heat....
so you end up running a radiator and fan arrangement on the recirculated water..... maybe something more elaborate even.

square one anyone?  :lol:



Not quite, steam engines usually have a condenser to turn the steam back into water in order to reuse it. OK you would need additional parts to do that but its not going to be that difficult. The condensed water will still be near boiling so you could put more of it into the cylinder too resulting in even greater efficiency.

It would also reduces the need for a stainless steel exhaust.
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6 stroke engine
Reply #13 on: April 01, 2006, 03:48:16 AM
Exactly what i was thinking, just didnt want to sound like a steam freak! :d
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Re:6 stroke engine
Reply #14 on: April 01, 2006, 04:15:59 AM
The post someone made as a comment covers 2 important issues.

1.) Oil emulsification, as piston seals are never 100%.

2.) It could infact be harming the fuel efficiency of the engine, An engine uses the residual heat to help ignite the fuel thats injected, by getting rid of that heat.. you could infact be lowering fuel efficency of an engine, purely to get it back in the last cycle.

:|
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