Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > 4 stroke with no valves, no oil reservoir, capable of 2 stroke rev's plus
Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions
Location: Marlboro MA
Joined: Dec 8, 2007
Points: 1328
4 stroke with no valves, no oil reservoir, capable of 2 stroke rev's plus Original Message Jan 4, 2012 7:09 am
Interesting design at the link below of a 4 stroke engine without valves. The valves are replaced with two pistons which act somewhat like reed gates to control input and exhaust flow to ports similart to a 2 stroke.
Re: 4 stroke with no valves, no oil reservoir, capable of 2 stroke rev's plus Reply #19 Jan 24, 2012 1:29 am
I do not like that design. My old Submarine had a Fairbanks engine. It had 2 cranks. The lower crank ran the generator and the upper crank drove the blower, water pump and stuff. It had 2 pistons for each cylinder. When the pistons come together it compresses the air and a injector the size of a 2 liter coke bottle injects fuel. Very reliable design. Tug boats use them too, they make about 4,000 Hp at about 50 gallons of fuel an hour. I do not think they will make a good snow blower engine though.
