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Switchable 2/4 stroke cycle turbocharged engine?
Blaster250
02-08-2005

I just came across this, I dont know if its real, but hell, sounds like a ok idea.


http://www.halfbakery.com/idea/High_...troke_20engine
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  #1 (permalink)  
Banshee on 02-09-2005
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Doesn't sound possible but I guess I haven't seen any diagrams of the motor and how it would work so I guess anything is possilble. If it is a 4-stroke and a 2-stroke in one motor I don't think it is possible. If it is just switching between 2 motors then I can see it
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Blaster250 on 02-09-2005
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I wasnt exactly sure either, it talks about both valves being open at the same time. To have that both cams would have to be controlled seperatly, which would mean no timing chain, what would you use, maby servos?
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PA_Banshee on 02-09-2005
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More and more things are converting over to a "fly by wire" type of setup. I know some cars are already disconnecting the steering wheel from the rest of the setup and using sensors and motors to do the work for you. I can see the ability to do it I just don't know if it's practical or not to make a 2 and 4 stroke engine? It seems like it would increase the level of maintenance and the likelihood of failure.
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arlan_jacob on 02-09-2005
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Quote:
Originally Posted by Blaster250
I wasnt exactly sure either, it talks about both valves being open at the same time. To have that both cams would have to be controlled seperatly, which would mean no timing chain, what would you use, maby servos?
Regarding cams, there would be none thanks to the electronically activated solenoid valves
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climb any hill on 05-07-2008
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I have seen 2 stroke conversion kits for the 400/450 4 strokes.. Not sure how well it works but curious to know..
I'll have to dig up that link!
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  #6 (permalink)  
SHOWTIME on 05-07-2008
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ive heard of it but it scares me.
just sounds strange...
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  #7 (permalink)  
dajogejr on 05-07-2008
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Yeah, that'll work...not.
With both valves opened simultaneously, turbo or not....how does the engine know which valve to pull from, which to push out?
On a two stroke it's easy....the port timing is setup that way....don't know how they're gonna do that on valves....
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  #8 (permalink)  
Diesel_Tech on 05-07-2008
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Quote:
Originally Posted by dajogejr
Yeah, that'll work...not.
With both valves opened simultaneously, turbo or not....how does the engine know which valve to pull from, which to push out?
On a two stroke it's easy....the port timing is setup that way....don't know how they're gonna do that on valves....
This motor would work. And does work!

The motor is completely electronically controlled. As for the camshafts, well there would be none. The valves are electronically controlled via no rotating parts. Its the EVC system, very recent technology, and your going to see it in cars soon. I was reading the comments on that page, as the one guy was talking about honda V-Tec engine timing, that is probably the most advanced variable timing system in a modern day car, until the invention of the EVC system.

The problem with this motor is that between switching from 2-stroke to 4-stroke and vice/versa, the Lamda (stoichiometric) balance of air and fuel will be compromised, so thus the system would obviously have to be Direct Injection, could not be carburted, throttle body, port injection... Has to be direct cylinder injection to maintain the proper AFR when switching the cycles.

Another problem you face is ignition issues, since generally 2-strokes will run hotter than 4-strokes. So your plug choice is going to have to accompany both power options without compromising either one. That is going to be sacrifice in itself.

There is alot I could say about this motor. But enough said as of now.
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  #9 (permalink)  
MADILL on 05-07-2008
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well im not a master mine of engines but i do know some....i can see it working....all the old detriot diesel engines like the v92's and stuff where 2 stroke diesels ...how they tic i really dont know ... have never been inside one
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