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Car Forum / Driving, Maintenance, Tuning / General Car Topics / July 2006Spring Mounted Retractable Piston Head
The goal is to clear all the exhaust gas from a 4 stroke cylinder. The piston would be ringed as usual but mounted on springs that would compress at just a little more than back pressure. On the compression and power strokes the pressure would cause the piston to bottom out for conventional operation, i. e., head space and compression ratio. On the exhaust stroke, however, the piston would extend to expell all the gas. They've done so much in reciprocating something like this has probably already been done. Bret Cahill In article <1152565414.612188.218810@p79g2000cwp.googlegroups.com>, > The goal is to clear all the exhaust gas from a 4 stroke cylinder. It is? Then why do they meter it back in thru the EGR valve? >The goal is to clear all the exhaust gas from a 4 stroke cylinder. The >piston would be ringed as usual but mounted on springs that would >compress at just a little more than back pressure. If the springs are compressing then the piston is not going up all the way and the objective is lost. And more moving parts mean more things to break. >On the compression and power strokes the pressure would cause the >piston to bottom out for conventional operation, i. e., head space and >compression ratio. On the first hiccup, the piston would would hit the head. On the intake stroke the crank is rotating down and the piston is momentarily not. Less than efficient. >On the exhaust stroke, however, the piston would extend to expell all >the gas. Engine speed will likely keep the springs compressed on up strokes and in tension on down strokes, except for that last little bit where the piston hits the head or goes down too far and hits the crank. The shock load on the springs would fracture then very soon and this becomes a high maintenance engine. >They've done so much in reciprocating something like this has probably >already been done. Filling and clearing the cylinders quicker is done with blowers and turbos - at a cost. >Bret Cahill Any relation the Popular Mechanics Cahill who wrote some pretty goofy and slanted auto articles back in the day of mouse milk? Someone was worried about CO2 mixing with steam to form acid in the 6 stroke Crower cycle engine. Instead of a radiator Crower uses diesel fuel injectors to inject water in the 5th stroke for internal cooling as well as another power stroke. Crower provides cams for racing so it was easy for him to convert an off the shelf engine to a "6-stroke." The engine basically alternates between an Otto cycle and some kind of steam cycle. Power drops a little but efficiency and cost effectiveness increases. RO water is only pennies/gallon. Supposedly you can run the engine in your lap and it will only feel warm, not hot. The problem above arose if the water was condensed and recycled which is how CO2 became an issue. Someone thought the acid would get concentrated and eat up the engine. I was wondering if anyone ever tried a completely clear the exhaust gases from any engine, 2 or 4 stroke. > >The goal is to clear all the exhaust gas from a 4 stroke cylinder. The > >piston would be ringed as usual but mounted on springs that would > >compress at just a little more than back pressure. > If the springs are compressing then the piston is not going up all the > way and the objective is lost. And more moving parts mean more > things to break. On the compression and power strokes the pressure would cause the piston to bottom out for conventional operation, i. e., head space and compression ratio. > On the first hiccup, the piston would would hit the head. The piston would have limiting stops either way. > On the > intake stroke the crank is rotating down and the piston is momentarily > not. Less than efficient. It's only about 10% of the stroke length, depending on the compression ratio.. > >On the exhaust stroke, however, the piston would extend to expell all > >the gas. > Engine speed will likely keep the springs compressed on up strokes and > in tension on down strokes, except for that last little bit It's not important where it extends on the exhaust stroke, just as long as it does it before top dead center. > where the > piston hits the head or goes down too far and hits the crank. The > shock load on the springs would fracture then very soon and this > becomes a high maintenance engine. I can believe that might be an issue. > >They've done so much in reciprocating something like this has probably > >already been done. > Filling and clearing the cylinders quicker is done with blowers and > turbos - at a cost. > >Bret Cahill > Any relation the Popular Mechanics Cahill Was his name "Cahill"? Bret Cahill |
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