weswanson

I have a question on the crank case vent line. How long can I run this fuel tubing? A foot okey?
This is on a Satio 62.

Walt

NM2K

My Feedback: (14)

Some folks have experimented and have stated that they did not have problems until they exceeded 4" in length. Of course, this would have to be dependent upon the displacement of the engine, where the tap is placed on the engine, the diameter of the fuel tubing, etc.

The good part is that it isn't likely to cause any real harm if the length is not optimum for the engine with an attentive operator.

I have also considered making a kind of venturi pump to help the oil exit the engine. Then it probably wouldn't matter at all as long as negative pressure were being applied to the end of the tubing.


Ed Cregger

Jerryballs

My Feedback: (19)

S MOORMAN,
I had issues trying to keep a couple planes looking scale. I paid a lot of money for flex pipes but did not get the tank pressure. I then found these Turbo Mufflers. On some I use them alone and other times I used the 90 degree adapter. I put them where I wanted them and I get tank pressure. Here are a few pics showing the installation. Hope this helps, Jerry

Tbone4life

Have you ran the mufflers yet? if so are they loud? I seen a link to those somewhere on here I think the guy lives in Baton Rouge, LA. area and I was thinking of trying one out for my FA 100.

w8ye

My Feedback: (16)

I have run the Turbo muffler. It is not loud. It has a good sound and makes about 300 more rpm than the standard muffler.

Tbone4life

It just looks like one of those "too good to be true" things. I assume it has some type of baflle in it?

RC Specialties

tbone4life,

The TurboHeader for the 1.00 does not use a baffle. It uses acoustics to tame the tone. The same muffler used on the .82 does have a low restrictive baffle that retunes the chamber for the smaller displacement. The tone remains about the same. W8ye is correct on the performance increase.

Jim

Michaelh

My Feedback: (4)

So what would the downside be ? I have mine around 8inches increased to 1/8th inch tube . The increaser is large brass tubing as to not restrict the flow.

What kinda damage are we talking about here?

Mike

w8ye

My Feedback: (16)

The downside would be reduced power and blowing oil out the front bearing and increased corrosion inside the crankcase

colecaz

I, too, am interested in the length issue. I have a Saito 72 mounted upside down and have about 8" of 1/8 fuel line clamped to the vent and run over the top and out the bottom behind the engine. I cut a diagonal in the end with the long side forward in an effort to make a venturi effect. I do get plenty of oil out the tube, so I assume it's working. I did have 3/32 fuel line at first but two flights with it on ended in dead stick. Did nothing but take it off and flew two flights for a full tank with no problem except slimed the fuse big time. The dead sticks both occured at the top of a stall turn. Maybe the smaller tube effected the idle?? The larger tube has given no problems.

I did email Horizon support and got back:

1rcaddict

Do you have a website for the Turbo mufflers?

stallwart

Scroll up page 378 and find RC Specialties, then pm him. He's the man.

boogermancan

my seagull laser 200 120 with a saito 150 GK has broken its flex pipe it was dangleing around the wheels it was dead stick and high up in the air i got it down in 2 pices the plane and the flex pipe []< ?should i go back with a flex pipe or a stright pipe and a fuel pump?>

boogermancan

Jerryballs
you have your self a real nice bird any chance a of getting mor pic of it

weswanson

The only good answer I think I got was run a length of fuel line no longer than 4 inches. I get so much oil my covering is pealing off. I'm going to try a foot of med. fuel line and see. I look at it as a syphon and ventury affect. I will let you know If problems happen.

Michaelh

My Feedback: (4)

Hmmm Ok I notice I have more oil then some coming out of my valve covers .
Will try to see what I can do to shorten it up. 4" is not very much though

Michaelh

My Feedback: (4)

Hey I measured my tubing tonight and total lenght was 9 inches. I really think this is the reason Im getting the lag in performance. During break in I was tacking around 8500-8700 rpm's ran a couple gallons through it then started to lean it out Im only getting 8700 on the same 18x6w and thats peak! Ive seen a couple times when tuning where it went up to 9500 peak then fell back off. I always thought it didnt tune like the other saito's I have done. I have tuned a couple for different people with a lot better results.

The only problem is 4" of tubing gets me down to the spray bar on my 1.80 . Not vey good, not even close to exiting the plane and Im not about to spray oil all over a $400 plane!

Im guessing the ad in MAN was right Saito's are for people who like to get there hands greasy! They need to fix that add BTW

If I run it and performance, tunability are better Im deaming this a desighn flaw that needs to be adressed ASAP!

So Question.

What can we do about this? Any Ideas? Ive already ruled out hooking it to the pressure tap on the exhaust as other engines do it.

Only thing I can think of is get a big piece of tubing (1" maybe) and routing the 4" piece into that. CF or something lightweight.



Mike,

w8ye

My Feedback: (16)

Buy a OS four stroke with the closed loop crank case ventilation

Michaelh

My Feedback: (4)

Why do that I have a $370 Saito engine right here

Sorry If I come off as rude and nagging, I would just like for more of you guys to come and share your wisdom and experience. Surely there has been something devised in all these years and all these Club Saito members.

N1EDM

My Feedback: (2)

I had a thought about this crankcase venting, and the tubing length. I imagine that there's a maximum length because the waste oil will form a 'plug' in a hose that is too long. There is a positive and a negative pressure on that nipple caused by the up-down motion of the underside of the piston. That plug of oil will flow back and forth in a too-long hose because there is only so much volume in the crankcase to push the plug out.

How about if we put a short piece of, say, 3/32" hole over the breather nipple (because that's the size that the nipple was designed for), then sleeve that piece with a larger diameter sleeve to let oil flow out, and air flow in simultaneously

I don't know if I made any sense with my description or not...

Just a thought...

Bob

w8ye

My Feedback: (16)

There's another alternative for the Saito. That is to have two vent lines hooked to check valves. One is the intake and the other is the exhaust. The one with the oil can be as long as you like. There is a second blind hole position on the back plate adjacent to the existing vent line. Drill and tap the hole for a second vent line. Saito sell s the check valves to do this.

http://www.horizonhobby.com/Products...dID=SAI130T68A

phippsa3

What size propnut would i need for a saito 91s.
Just need to know the diameter of the prop shaft really.

Thanks
Andrew.

w8ye

My Feedback: (16)

7 X 1 mm

RPMcK

My Feedback: (1)

interesting discussion about the crankcase venting. Wonder if you could just put a check valve in the discharge line from the already installed nipple and solve the discharge problem? At least that way it wouldn't be likely to suck the discharged oil back in. But I am gonna' duck after suggesting that!

w8ye

My Feedback: (16)

The crankcase vent has to be able to suck and blow while discharging the oil out the end of the tube.

If you install just a check valve in the original tube it cannot suck