Welcome to Club SAITO !
RE: Welcome to Club SAITO !
Manifold injection was also called Throttle Body Injection (TBI). It was an improvement over a carburator because of improved fuel control and does not use a venturi. A venturi causes a vacuum in the intake manifold for fuel suction, but also causes power loss because it lowers the cylinder pressure.
Port Fuel Injection injects fuel just upstream of the intake valves. It is an improvement in performance and emissions over throttle body injection. But still suffers from fuel puddles accumulating on the back of the intake valve.
Direct fuel injection started out in diesels, but is now also used in the latest gasoline engines. It provides the best fuel control, and power. The biggest benefit of gasoline direct injection is that when the fuel is injected at the compression stroke, it actaully causes a rapid cool down of the compressed air, allowing for reduced pumping losses by allowing the air to cool down and condense right before combustion.
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
Port Fuel Injection injects fuel just upstream of the intake valves. It is an improvement in performance and emissions over throttle body injection. But still suffers from fuel puddles accumulating on the back of the intake valve.
Direct fuel injection started out in diesels, but is now also used in the latest gasoline engines. It provides the best fuel control, and power. The biggest benefit of gasoline direct injection is that when the fuel is injected at the compression stroke, it actaully causes a rapid cool down of the compressed air, allowing for reduced pumping losses by allowing the air to cool down and condense right before combustion.
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
RE: Welcome to Club SAITO !
ORIGINAL: hsukaria
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
The pylon racers did it to some extent as well (at least until idle rules in some classes were implemented).
OS went all the way and marketed a real fuel injected 4 stroke engine for a while, with a real fuel pump, fuel injector and a ECU unit.
RE: Welcome to Club SAITO !
ORIGINAL: earlwb
Actually they did that with the glow engines already. The combat, speed and hi-perf FF engines used bladders that you inflate with fuel. The bladders developed a lot of pressure too. The intakes on the engines then used a large intake hole with no venturi, since they don't draw fuel the intake can be made larger, and the needle valve assembly usually wound up being a 1/2 length/size unit on one side and it sprayed the fuel directly into the intake with no obstructions inside.
The pylon racers did it to some extent as well (at least until idle rules in some classes were implemented).
OS went all the way and marketed a real fuel injected 4 stroke engine for a while, with a real fuel pump, fuel injector and a ECU unit.
ORIGINAL: hsukaria
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
The pylon racers did it to some extent as well (at least until idle rules in some classes were implemented).
OS went all the way and marketed a real fuel injected 4 stroke engine for a while, with a real fuel pump, fuel injector and a ECU unit.
RE: Welcome to Club SAITO !
ORIGINAL: hsukaria
I've been told about the OS fuel injection before. I bet it wasn't cheap, but OS is never cheap.
ORIGINAL: earlwb
Actually they did that with the glow engines already. The combat, speed and hi-perf FF engines used bladders that you inflate with fuel. The bladders developed a lot of pressure too. The intakes on the engines then used a large intake hole with no venturi, since they don't draw fuel the intake can be made larger, and the needle valve assembly usually wound up being a 1/2 length/size unit on one side and it sprayed the fuel directly into the intake with no obstructions inside.
The pylon racers did it to some extent as well (at least until idle rules in some classes were implemented).
OS went all the way and marketed a real fuel injected 4 stroke engine for a while, with a real fuel pump, fuel injector and a ECU unit.
ORIGINAL: hsukaria
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
As mentioned before, the fuel injection in model engines would be the throttle body (or manifold) injection. If done properly, besides helping with fuel control, it can help with increasing power by eliminating the carb venturi.
The pylon racers did it to some extent as well (at least until idle rules in some classes were implemented).
OS went all the way and marketed a real fuel injected 4 stroke engine for a while, with a real fuel pump, fuel injector and a ECU unit.
pics? links? data?
RE: Welcome to Club SAITO !
ORIGINAL: flyingagin
I have have looked but have not seen or heard anymore than what I have seen here. Not interested in owning one just curious. I like motors. Any I only have a rubber band motor budget
pics? links? data?
I have have looked but have not seen or heard anymore than what I have seen here. Not interested in owning one just curious. I like motors. Any I only have a rubber band motor budget
pics? links? data?
OS advertisement for them http://www.os-engines.co.jp/english/...0sfi/index.htm
OS had a .91, 1.60 and a 2.00 fuel injected engine.
Tower Hobbies still has some parts even.
http://www3.towerhobbies.com/cgi-bin...=OSMG0941&P=OW
OS had a 2 stroke 1.60 with FI:
OS FS091FI in use. it is not mine though. Sorry.
My Feedback: (16)
RE: Welcome to Club SAITO !
Life wasn't so simple as fly out of the box with the OS FI engines as you had to follow a procedure to establish the limits of the fuel mixture algorithm about as often as you would need to adjust the needle valve on a regular carb engine. You would get along with the same limits all summer but in the fall as the weather started getting a little cooler, you would have to set the limits up again.
RE: Welcome to Club SAITO !
ORIGINAL: w8ye
Life wasn't so simple as fly out of the box with the OS FI engines as you had to follow a procedure to establish the limits of the fuel mixture algorithm about as often as you would need to adjust the needle valve on a regular carb engine. You would get along with the same limits all summer but in the fall as the weather started getting a little cooler, you would have to set the limits up again.
Life wasn't so simple as fly out of the box with the OS FI engines as you had to follow a procedure to establish the limits of the fuel mixture algorithm about as often as you would need to adjust the needle valve on a regular carb engine. You would get along with the same limits all summer but in the fall as the weather started getting a little cooler, you would have to set the limits up again.
RE: Welcome to Club SAITO !
Those fuel injected engines are awesome. But I'm sure only the professional competition guys would spend that kind of money (or you are crazy about engines).
I'm just happy I was able to replace a piston ring on one of my cheaper 2-strokes last weekend. I will bench run it soon to break it in. Simple pleasures.
I'm just happy I was able to replace a piston ring on one of my cheaper 2-strokes last weekend. I will bench run it soon to break it in. Simple pleasures.
My Feedback: (102)
Join Date: Dec 2001
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RE: Welcome to Club SAITO !
As you can see my pictures posted some time after I actually posted them. The YS 1.15 finally has the regulator where it should have been all along. The 1.70 has the fuel injection pump on the intake pushrod and the mixture is controlled by the carb barrel
RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
As you can see my pictures posted some time after I actually posted them. The YS 1.15 finally has the regulator where it should have been all along. The 1.70 has the fuel injection pump on the intake pushrod and the mixture is controlled by the carb barrel
As you can see my pictures posted some time after I actually posted them. The YS 1.15 finally has the regulator where it should have been all along. The 1.70 has the fuel injection pump on the intake pushrod and the mixture is controlled by the carb barrel
Senior Member
My Feedback: (19)
RE: Welcome to Club SAITO !
The wire in the YS DZ-1.70 CDI photo is for the spark trigger. I just got a FS-91S-FI. I'm looking forward to trying it.
RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
I suspect that would be a throttle position sensor to make the fuel injection more accurate, that's just a guess though.
I suspect that would be a throttle position sensor to make the fuel injection more accurate, that's just a guess though.
RE: Welcome to Club SAITO !
ORIGINAL: gkamysz
The wire in the YS DZ-1.70 CDI photo is for the spark trigger. I just got a FS-91S-FI. I'm looking forward to trying it.
The wire in the YS DZ-1.70 CDI photo is for the spark trigger. I just got a FS-91S-FI. I'm looking forward to trying it.
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Join Date: Dec 2008
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RE: Welcome to Club SAITO !
OS electronic fuel injection is a nice concept, but judging from the instructions manual, the tuning of the injection system is something complicated and aimed for experienced modellers. However, I believe that if the simple glow carb was inadequate, electronic fuel injection would have taken its place (just like in automobile engines). Talking about fuel injection however, what makes 4 stroke YS engines system a "fuel injection" system?
RE: Welcome to Club SAITO !
ORIGINAL: JariV
My member number can be released for someone else. I sold my only Saito engine.
My member number can be released for someone else. I sold my only Saito engine.