FLAPHappy

My Feedback: (209)

Saito Engine vent valves

I would like your input on venting the crank vent fitting on the rear of the crank, and vent that directly into the carb via tubing.
I tried it, and seemed to work great, much more smoke since it's venting unburnt fuel back to the Carb. Is that more lubrication or am I wasting my time? Will it hurt an engine by doing this?

Mr67Stang

I do not believe this would hurt the engine but I gues I would wonder what you hope to gain by doing so. If you have a tach available I would love to see if there is a difference in performance, Pos or Neg. If it's a performance gain, I guess I would also loke to see a picture of how you did this...

Gray Beard

My Feedback: (-1)

OS has been doing something like that for a while, I question it though, seems like it's sending the nasty oil back through the engine?? If you go into the gas engine forum then into Manufacture support you can ask the Saito rep direct instead of getting replies from those of us not really in the know. Have you ever looks at what that vent line looks like after a short time of running?? Gets a bit nasty looking. I have seen some OS users cap that off and just run a line as a vent, not the other way around. Ask the saito man!!

w8ye

My Feedback: (16)

There is no manufacturer's support for Saito in the forums

Gray Beard

My Feedback: (-1)

That is a big surprise, even YS has support there. Maybe a phone call to Horizon?? I would like to know if there is a problem doing it?? I wouldn't bother but I would still like to know.

w8ye

My Feedback: (16)

You will have to ask Horizon about it?

Great Planes/Hobbico/Tower has a representative in sevral different areas

42etus

My Feedback: (2)

I've done exactly that on my 72 and 115. It reduced the amount of oil getting all over, but didn't eliminate it. I think some of the mess is backspray coming back out of the carb. I put a velocity stack on each engine and that seemed to help also.
Paul

FLAPHappy

My Feedback: (209)

All I did was take short piece of fuel tubing aboit 1/2 inch, slipped that on the vent, bent a short piece of brass fuel tubing, bent it 90 degrees or whatever it takes, slipped that on the fuel tubing from the vent. I made sure the brass tube was at least 1/2inch in the throat of the carb. I have tried this on a Saito 72 and a 150, man the smoke is unbelievable. Ya don't need a smoke pump! The carb blowback it reintroduced back into the carb and reburnt with ignition. I think it provides much more lubrication by the evedince produced in the exhaust. This is my opinion only, but I think it's ok, no long term tests were made, but I am going to try it on my Saito 150 attached to a 4*120.
I can't imagine it would foul a plug when running, but I want to try it. I will give it a tach test with and without, interesting..

dignlivn

IMO,


It is just excess oil being expelled that was not burned off. I just
put fuel tubing on the vent and clean after each session.


Bob