JustErik

Is this the velocity stack that fits the .82?



Thanks,

Erik

Capt Lou

It sure looks like the one I put on my .91 and 100 Saitos. You must put an O-Ring or seal between the base of the velocity stack and the carb, otherwise, the space will allow air to enter the carb without going thru the stack.

Mr48Volts

I have a new 1.25 Saito , running 15% nitro fully synthetic no castor blend and with a 3 blade MAS 15x7, a MAS 16x6 2 blade and an APC 15x8 I'm only getting between 6500 and 7100 rpm , the engine has only been bench run at present and has had 2 litres max fuel through it...

Do you experienced Saito guys think it will bed in and give a higher redaing with more fuel through it???

It's going into a 1/7 World Models P47D when ready.

It seems from the manual I'm down 1500-2000rpm???

Thoughts anyone?

Cheers

Scotty

Hobbsy

My Feedback: (102)

Yep http://www.horizonhobby.com/Products...odID=SAI50GK93

Jimmy Hoffa

My Feedback: (3)

Is it normal for the high speed needle to only be 1 1/4 turns out on a Saito 1.00? A friend just bought a new one and after break-in (1 gallon) and without adjusting the LS this is the peak minus 300 rpms. The motor runs strong and transitions from idle to full power instantly and with no hesitation. My Saito 82's are usually 2 to 2.5 turns out on the HS.
Phillip

Hobbsy

My Feedback: (102)

Phillip, there is no standard number of turns, the only determining factors is where it runs the best. Make sure you have the HS at absolute peak when you set the LS needle, the needles effect each other but the HS needle seat is fixed so it needs to be set first.

speed lover

Thanks for the welcome BLW can anyone help with advising me on running this engine further. I don’t want to over rev or over heat it. This is my first 4 stroke and any knowledge or help with this would be great. What sort of RPM is expected also how do you know when to start leaning out and how far. All my other engines are 2 stroke and I use the pinch test but I don’t think this will work please help.

Hobbsy

My Feedback: (102)

SL, you went way overboard on the 4,000 rpm thing, that is only for 10 minutes. A Graupner 12x6 would be perfect and should turn about 9,500 to 9,800 on 10% nitro. 5% and under castor will be fine.
My method is
4,000 rpm for 10 minutes
5,000 for 10 minutes
6,000 for 10 minutes
6,500 for 10 minutes all rich enough to miss or cough a little once every few seconds but not so rich as to require full time glow power.
Peak HS to max rpm then procede to lean the LS needle 1/8th turn at a time checking the transition and top rpm after every other change. At some point it will quit on the transition, go rich 18th to 1/4 turn on the LS needle, richen HS needle 200 to 300 rpm downward and go fly. Your engine will change very little from here on out. Check valve lash and lube rockers after break in.

otrcman

There are no doubt lots of people who are more qualified to advise you, but it has been my experience that setting a four-stroke by ear doesn't work very well. For initial set-up of a new or unknown engine, using a tachometer will give more consistent results. For instance, I found on my FA-45 that when new a reliable setting could be attained by leaning to peak, then backing down by 400-500 RPM. As the engine broke in more fully, I was able to set it to about 200 RPM rich of peak and still get reliable running. If leaned too much when still new, then engine tended to quit in flight after a few minutes.

And yes, the engines seem to improve with run time. Perhaps 5 to 10 hours before they are fully broken in to where they are tolerant of over-leaning. At least that's been my experience both on my engines and in observing others.

Dick

speed lover

Thanks for the advise guys feel a lot more confident now to bash on with it. I was wanting to put it in a 5lbs plane but am not sure how much speed it would give me. Really I want to put it in a Super Sportster ARTF have any of you put a 56FA in a plane like this or similar if so what kind of performance does it give the plane. As I don’t really know what thrust 4 strokes give I usually fly 6-6 ½ lbs planes I went from a METEOR 60 in my 6.4lbs Cap 232 to a Super Tigre G75 which I have just put in and will be running it in next week will it be similar to that thrust to weight ratio of having a G75 or the 60.

N1EDM

My Feedback: (2)

JustEric, yup, that's a velocity stack. It should slip over the mounting screws. There will be a gap between the stack and the carb intake. Some folks thought that there should be an o-ring to fill that gap, but none is shown in the parts list. And, we've pretty much come to the conclusion that one isn't necessary after all.

otrcman, I'll send that out to your email address. I have one for 2006, and I noticed that there were some subtle differences between the 2004 and 2006 parts callouts. I think that the carb was now a revision C instead of a rev B as shown in the 2004 manual. I'll send it along, but any changes will be petty. You could do very well with the one that W8YE sent you.

You mentioned using the backplate from your Saito 45. That might not work. If you notice, the backplate is part no. 5017B. That means that it was first used on a Saito 50, and it's item no 17 on the parts list. The "C" is the design iteration of the part. You can find the part number on HH by putting a SAI prefix in front of the stock number - for example, you could do a search for SAI5017B.

Hope that this helps,

Bob

Lidman

My Feedback: (41)

Hey W8ye , I need a back plate for an FA 45 will the SAI5017B fit this engine? I can't seem to figure out how to find parts for this old engine on the Horizon site. Please let me know how and where I might find this part. Thanks Lidman

w8ye

My Feedback: (16)

There are no parts in the USA for the 45 unless you can find a used one somewhere. Horizon was never a distributor of the 45. The 45 had been dropped by the current USA distributor of the time before Horizon was formed.

The 45 MKII that everyone in the country mostly possess has a little flat tab with on screw hole in it for a carb mount. Most of them are broken.

I'm not sure of the OD of the part of the back plate that fits inside the engine. I don't have a 45 MKII.

The 45S version looks just like a 50 and it is highly likely the rear parts will directly inter change with a 50. I have never seen a parts interchange for the 45S.

blw

My Feedback: (3)

Mr48Volts- you are club member 595

Jimmy Hoffa

My Feedback: (3)

Hobbsy,
Thanks for the answer to the above question. I do have one more question regarding my friend's plane with the Saito 1.00. The fuel tank is positioned higher than the carb and there's no way to lower it. The problem is than when the motor is not running fuel floods the carb. My idea for a solution is to add a pressure system with a regulator, like the Iron Bay. Any suggestions?
Phillip

Hobbsy

My Feedback: (102)

The IB or the Cline either one will work perfectly. He can enjoy consistant engine runs from full tnk to empty and can set the HS needle for 150 to 200 rpm rich instead of the usual 300 or 400 since he will no longer have to set it rich for when the tank is nearly empty.

My advice would be to set the engine up in a test stand under ideal conditions, that way he will not have to change the needle settings when the regulator is installed.

rdrude

Maybe my brain is rusty from no flying over the winter, but I have a question about my 82. I added an on board glow over the winter. Engine runs fine with good transition... but I am noticing the revs are staying quite high at idle for a few seconds, then drop to a nice idle speed. I am thinking this is an issue with the on board glow and not a needle setting issue.
What do you think, oh great experts of all things Saito.
Rob

w8ye

My Feedback: (16)

Idle is too rich

rdrude

So, lean out the LS a bit?

w8ye

My Feedback: (16)

Yes. The idle is just a little rich and as the engine loads up at idle . . . . it slows down to a slower equilibrium point.

rdrude

Ok, that is what I thought. I will turn it in and decrease the idle trim to compensate. Thanks for the help!
Rob

w8ye

My Feedback: (16)

Rob,

Check yourself by checking the engine for acceleration from idle. If it shuts off on you when you try to accelerate, it is too lean.

Also if you have to open the HS needle excessively to try to get the engine to run at high speed, your idle may be too lean.

conchohoncho

My Feedback: (120)

I have a Saito 170 triple in a 17# Beaver. It takes almost all of a 600 foot paved runway to get airborne. That with a headwind. The when in the air it lost some power and landed it. I have the Sonics onboard glow on a switch and the glow was on and I think that it droped a cylinder while airborne. Does anyone have any ideas?
Member #260
Thanks,
Richard

blw

My Feedback: (3)

Wow, I bet it does take a lot of room to get airborne. The h.p. that Saito gives for the 1.20 and 170R3 is 2.0, and that sounds about right. I also have a 170R3 NIB.

By the way, you are member number 596.

conchohoncho

My Feedback: (120)

Did you redo the member numbers? I have been #260 for a long time.
Richard