Tom Jones

My Feedback: (4)

Bill, nice to see you back. Question...I've got a 100Gk with about 2 gallons through it. Had a small accident when the battery came unplugged on take-off. Ran into a safety fence, the plastic construction kind. Anyway, after fixing the plane I went out and ran the engine just to make sure everything was OK. Ran it dry then put in an once of ARO and turned the prop over to get rid of the excess. I was holding the muffler and noticed a click that I could feel in the muffler. Any ideas of what this might be? The engine seemed to run great, idled about 1950, peaked about 9800. TIA Tom.

Kimhoff

My Feedback: (22)

Anyone know what the clearance should be between the crank pin and the back plate?

Hobbsy

My Feedback: (102)

Most of them touch lightly.

William Robison

My Feedback: (3)

An answer out of sequence -

Tom:

If the "Click" is the muffler moving in its attachment to the cylinder, correct it before running the engine again. What it probably is, though, is the free play in the timing gears we've covered before and this is normal, not to worry about. But do check the valve clearance.

Kim:

To clarify Dave Hobbs' comment on the back plate clearance, the crank pin should never touch the back plate, but since the back plate is what holds the rod on the pin it's normal for them to touch lightly. With the cylinder off the engine there should be a few thousandths end play of the rod on the crank pin.

Bill.

PS: Stallwart, glad you're pleased with your engine. wr.

RVM

I just got my Saito .82a GK in, and it did come with the velocity stack already installed.

juvaknin

Hi guys,
i have problem with my Saito-180...
if you guys can get into this link and help me, i'll be thankfull!!!
Thanks for your time!
(here is the link!)
[link=http://www.rcuniverse.com/forum/m_4950299/tm.htm]http://www.rcuniverse.com/forum/m_4950299/tm.htm[/link]
Thanks Again!

RVM

I haven't seen where anyone has actually weighed their Saito .82, so for anyone interested, here are the numbers in ounces. Just a little bit less than published figures, I think.

alpinestar

OK gang;sign me up!!

hadsold with the plane)
45s- GP Taylorcraft on floats
65GK- Goldberg Cub (great combo)

have:
91s- GP cap 232 (40-size).
100- NIB waiting to live in a Hog Bipe on floats
125- GP Gee Bee
150- BUSA se5a
182t- currently unemployed

Does a 182t fit well on a 1/4 scale cub? (probably Sig)? Not sure if the carbs would fit under the cowl. I've heard this engine does not fit well in planes like a 1/4 Spacewalker due to the carbs. Any thoughts?? Flipping it upside down so the carbs are on the botom would solve one problem,but now the exhuasts are pointed up not down. Hmmm..

Jimmy Hoffa

My Feedback: (3)

What benefit does a velocity stack on the carb provide?
Phillip

RVM

Better fuel efficiency, up to about 30% improvement from what I've read. Also, it gives a convenient place to mount an air filter, which gives even better fuel efficiency and protects the engine too. Some say it improves power, but I've never seen anyone show actual numbers to back this up.

Jimmy Hoffa

My Feedback: (3)

That would be significant. Saito should include them with the motors. Is there a downside?
Phillip

RVM

It weighs like 1 gram? hehe

Hobbsy

My Feedback: (102)

They're also easy to make.

TimC

Here's a link to a thread last May where I tested an .82 with and without a stack/filter and recorded rpm and run time: [link=http://www.rcuniverse.com/forum/m_4280741/anchors_4280741/mpage_1/key_Stack/anchor/tm.htm#4280741]Stack/Filter Test[/link]

Jimmy Hoffa

My Feedback: (3)

It seems like an advantage of the stack would be to cut down the spitback and keep the plane cleaner.
http://www.horizonhobby.com/Products...odId=SAI50GK93
Phillip

rajul

My Feedback: (58)

Tim, do you have any data with stack/no filter?

TimC

Yes rajul, in the test I ran both the .56 and the .82 with a stack and no filter. There was a slight gain in rpm with the .82. The .56 tached the same.

rajul

My Feedback: (58)

Tim, how "slight"? Was it like less than 50 rpm?

TimC

The .82 peaked at 10,050 with no filter or stack. With just the stack, it peaked at 10,170.

Hobbsy

My Feedback: (102)

Tim, according to Bills post in that thread my stack is too long, maybe tomorrow I'll run a stackless run, run with the stack as is and then cut it to Bills recommended length. I don't use filters.

rajul

My Feedback: (58)

Tim, thanks for the clarification.

rajul

My Feedback: (58)

Hobbsy, what's Bill's recommended length, versus the original length?

Hobbsy

My Feedback: (102)

His formula in that post is 2 to 2.5 times the diameter.

Per Bill:Nominal length is two to two and one half times the inside diameter. The longer it is the more efective it is in containing the back spray.

blw

My Feedback: (3)

I found this tonight. It is new in the box, and I think the box was never opened. It came with a manual on xeroxed sheets with many spelling and grammatical errors. Anyway, the engine came home with me.

w8ye

My Feedback: (16)

Hello Barry,

I'm sure you will enjoy it. Now you need a 120 plane with a lot of wing area.

The carb has a right angle inlet. To keep from flooding the engine, you will need to turn the carb over where the inlet faces down. If you remove the throttle arm extension at the carb barrel, you should be able to loosen the retaining set screw and rotatew the carb 180 degrees where the inlet will face down.

Also if you move the exhaust tube with the tank pressure outlet to where the outlet is facing down, you will not hydrolock the engine through the exhaust valve. Maybe just turn it down on #1 cylinder but most likely you will need to move it to #2?

Firing order is 1-3-2. I would check the valves. the #2 cylinder on my 90 was way off.

Jim