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Welcome to Club SAITO !

Old 11-02-2006, 07:18 PM
  #5101  
Tom Jones
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Default RE: Welcome to Club SAITO !

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.
Old 11-02-2006, 07:45 PM
  #5102  
Kimhoff
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Default RE: Welcome to Club SAITO !

Anyone know what the clearance should be between the crank pin and the back plate?
Old 11-02-2006, 08:04 PM
  #5103  
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Default RE: Welcome to Club SAITO !

Most of them touch lightly.
Old 11-02-2006, 09:36 PM
  #5104  
William Robison
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Default RE: Welcome to Club SAITO !

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.
Old 11-03-2006, 12:46 PM
  #5105  
RVM
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Default RE: Welcome to Club SAITO !

I just got my Saito .82a GK in, and it did come with the velocity stack already installed.
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Old 11-03-2006, 12:55 PM
  #5106  
juvaknin
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Default RE: Welcome to Club SAITO !

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!
Old 11-03-2006, 01:01 PM
  #5107  
RVM
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Default RE: Welcome to Club SAITO !

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.



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Old 11-03-2006, 01:21 PM
  #5108  
alpinestar
 
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Default RE: Welcome to Club SAITO !

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..
Old 11-03-2006, 02:45 PM
  #5109  
Jimmy Hoffa
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Default RE: Welcome to Club SAITO !

What benefit does a velocity stack on the carb provide?
Phillip
Old 11-03-2006, 02:47 PM
  #5110  
RVM
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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.


ORIGINAL: Jimmy Hoffa

What benefit does a velocity stack on the carb provide?
Phillip
Old 11-03-2006, 03:25 PM
  #5111  
Jimmy Hoffa
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Default RE: Welcome to Club SAITO !

Better fuel efficiency, up to about 30% improvement from what I've read.
That would be significant. Saito should include them with the motors. Is there a downside?
Phillip
Old 11-03-2006, 03:28 PM
  #5112  
RVM
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It weighs like 1 gram? hehe
Old 11-03-2006, 06:01 PM
  #5113  
Hobbsy
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Default RE: Welcome to Club SAITO !

They're also easy to make.
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Old 11-03-2006, 07:01 PM
  #5114  
TimC
 
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Default RE: Welcome to Club SAITO !

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]
Old 11-03-2006, 07:20 PM
  #5115  
Jimmy Hoffa
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Default RE: Welcome to Club SAITO !

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
Old 11-03-2006, 07:31 PM
  #5116  
rajul
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Default RE: Welcome to Club SAITO !

Tim, do you have any data with stack/no filter?
Old 11-03-2006, 07:54 PM
  #5117  
TimC
 
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Default RE: Welcome to Club SAITO !

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.
Old 11-03-2006, 07:58 PM
  #5118  
rajul
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Default RE: Welcome to Club SAITO !

Tim, how "slight"? Was it like less than 50 rpm?
Old 11-03-2006, 09:59 PM
  #5119  
TimC
 
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Default RE: Welcome to Club SAITO !

The .82 peaked at 10,050 with no filter or stack. With just the stack, it peaked at 10,170.
Old 11-03-2006, 10:00 PM
  #5120  
Hobbsy
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Default RE: Welcome to Club SAITO !

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.
Old 11-03-2006, 10:05 PM
  #5121  
rajul
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Default RE: Welcome to Club SAITO !

Tim, thanks for the clarification.
Old 11-03-2006, 10:06 PM
  #5122  
rajul
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Default RE: Welcome to Club SAITO !

Hobbsy, what's Bill's recommended length, versus the original length?
Old 11-03-2006, 10:08 PM
  #5123  
Hobbsy
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Default RE: Welcome to Club SAITO !

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.
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Old 11-03-2006, 11:42 PM
  #5124  
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Default RE: Welcome to Club SAITO !

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.

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Old 11-03-2006, 11:44 PM
  #5125  
w8ye
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Default RE: Welcome to Club SAITO !

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

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