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Saito .82a

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Old 05-23-2004, 12:28 PM
  #1
Hobbsy
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Default Saito .82a

Saito .82a
Fuel Wildcat Premium 15%
Prop APC 14x6 RPM 9,210 peaked and 9,000 richened down to what I believe is a healthy setting for the engine.
This after 48 oz of fuel. It is now mounted on a Sig FourStar 60 kit that I finished quite some time ago.
I may revise these figures a little as I noticed that the new cast muffler on my Saito 100 is larger than the .82a cast muffler, same threads, if there is an appreciable increase in RPM I'll order another 100 sized muffler. I noticed that the .82a was noticably louder than my Saito .80 which also is equipped with the same cast muffler as the 100. I have the new cast mufflers on most of my Saitos now. I'll share my findings.
Idle rpm 2,250
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Old 06-14-2004, 08:03 PM
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vatechguy3
 
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Default RE: Saito .82a

where in VA do you live?? i'm in hampton roads, and have yet to see the 82 run.
am thinking of buying one for my funtana.

any new rpm numbers??

tony
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Old 06-24-2004, 11:38 AM
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Default RE: Saito .82a

Ive got the 82 on a funtana, makes a very nice combo.
APC 14x4w, 15%CP ---10,300 rpm
I get between 13-16 minites on a tank depending on how hard i am flying.

zonk
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Old 12-22-2004, 02:26 PM
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Pepe J
 
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Default RE: Saito .82a

Gentlemen.... Can you fellas with the 82 please post some more figures if possible. I'm really curious Hobbsy if the 100 muffler made much difference in power and noise levels?

I feel this engine is not much stronger than my OS 70 Surpass, but does have the weight advantage. If any of you have experienced both, I would like to read your comments. I think for a few ounces I may lean to-wards the FA100.


Happy Fly'n...
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Old 01-08-2005, 04:29 PM
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Default RE: Saito .82a

With one gallon of Omega under it's belt, my .82 turned 8700 with a MAS 13x8, still on the rich side. Gonna drop down to an APC 13x7 and see if I can touch 9000, that should be a nice happy number for it.

Andy
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Old 02-05-2005, 11:43 PM
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Default RE: Saito .82a

Saito 82, Power Master 20/20 fuel, Pro Zinger 15x4: 9800 peak.
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Old 02-09-2005, 07:14 AM
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Default RE: Saito .82a

Hey a65l ,, I am not trying to be technical, but I run Cool Power 15% and mix 5oz. of castor oil to make it have a 20% oil content, I was just letting you know that Omega and Cool Power only have 17% oil from the factory and Saito recommends at least 20% oil content for there 4 strokes, I don't know how much difference this will make in the long run but this is my first four stroke and it runs excellent on the 20% oil,15% nitro Cool Power,,
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Old 02-09-2005, 04:39 PM
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Default RE: Saito .82a

Quote:
ORIGINAL: a65l

With one gallon of Omega under it's belt, my .82 turned 8700 with a MAS 13x8, still on the rich side. Gonna drop down to an APC 13x7 and see if I can touch 9000, that should be a nice happy number for it.

Andy
It will definitely hit 10k.

http://www.saito-mfg.com/Adobe/singl...ifications.pdf
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Old 03-06-2005, 12:21 PM
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Default RE: Saito .82a

Saito 82a

15% Nitro
20% Oil (18% syn.- 2% cas.)
O.S. F-plug
APC 13 x 7
10200 RPM


The 10200 RPM was at a slightly rich setting and the 82 was easily pulling 10500 on the ground. This is only after 6 tanks of fuel. I'm certain RPM should increase slightly after a little more run time.
The 82 has the edge on my O.S. 70 and the power to weight ratio of the 82 is extraordinary. It has excellent compression and throttle transition. I'm very impressed with this power plant. Now to find an aircraft worthy of it?

Happy Fly'n....
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Old 03-14-2005, 09:24 PM
  #10
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Default RE: Saito .82a

It seems like the new 82 might have a little more power than the older 80. My 11 year old 80 turns a MA 14x6 @ 9200 rpm and a Dynathrust 15x6 @ 8000 rpm. The fuel was my own mix with 15% nitro 20% oil.
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Old 03-30-2005, 08:46 AM
  #11
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Default RE: Saito .82a

Question, What's the fuel economy like on the Saito 82a?
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Old 03-30-2005, 03:14 PM
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Default RE: Saito .82a

Question, What's the fuel economy like on the Saito 82a?

Answer: Bad... worse than most 91 4-strokes. It consumes over 1 oz per minute @ full throttle, quite a lot for its size. Saito must have designed huge overhead ports into these bored-out engines. This .82 has the same bore as the 100, just w/ a much smaller stroke of 20 mm whereas the 100 has a stroke of 26.
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Old 03-31-2005, 09:24 PM
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Default RE: Saito .82a

10,500 tuned for flight on Magnum 30% helo fuel. 1330 feet 70 degrees
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Old 04-18-2005, 07:11 PM
  #14
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Default RE: Saito .82a

Hobbsy,

Any progress with putting the new cast muffler on the 82a?

Steve
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Old 04-19-2005, 08:43 AM
  #15
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Default RE: Saito .82a

Just for interest, I have been wondering how much stronger the .82 is vs the .72 and from your readings I have to say I was expecting a bit more from the new engine.
I have a Saito .72 on a Flip 3d runing on 15% nitro swings a APC 14x4 W @ 10300 rpm, It pull the plane nicely but I thought about replacing it for the 82, but I see that there isn't any real benefits.
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Old 04-19-2005, 10:40 AM
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Default RE: Saito .82a

The benefit of the 82 of the 72 are

1) much faster spool up, especially on a heavier prop. The 82 spools up a 14x4W as quickly as the 72 spools up a 13x4W. The 82 spools up a 15x4W as quickly as the 72 spools up a 14x4W.

2) the 82 gets it benefit by swinging a larger prop like the APC 15x4W or Pro Zinger 15x5. It really uses the same range of props as most 91 4-strokes.

The 82 does have draw backs:

1) fuel economy is worse than the Saito 91 (I own both)

2) vibration is worse than Saito 91. I would go as far as saying it vibrates as much as a Saito 100, which I also owned before. If you ever see a Saito 82 on a Kyosho Flip, which has a wing Ultracote drum buzzing problem due to the thin clear covering and wide rib spacing, the Saito 82 adds the vibration source quite effectively at midrange.

If you look at the specs, the 82 has the same bore as the Saito 100. Talk about a short stroke engine. This large bore allows huge intake & exhaust ports to fit for a 4-stroke, and yet still claim a low displacement.

If you are looking to get more power than the 72 you have, the quickest way is to go to 30% nitro heli fuel. You gain about 500 rpm, but more importantly, the spool up response, which the 72 would suffer from a heavy 14x4W prop.
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Old 04-19-2005, 06:38 PM
  #17
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Default RE: Saito .82a

seanychen

That conparison was well put.
I have to agree that the spools on a 14x4w is not impresive, but I got used to it[]
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Old 04-20-2005, 11:56 AM
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Default RE: Saito .82a

I am using as I said earlier 15% nitro and running a 14x4w apc on my .82, and it turns 10300 on the ground, if I were to go up to 20% nitro what would the advantage in power/rpm be,,,,,,
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Old 04-20-2005, 03:51 PM
  #19
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Default RE: Saito .82a


Quote:
ORIGINAL: jongurley

I am using as I said earlier 15% nitro and running a 14x4w apc on my .82, and it turns 10300 on the ground, if I were to go up to 20% nitro what would the advantage in power/rpm be,,,,,,
30% nitro will bring 14x4W RPM to 10700. So I am guessing w/ 20/20, rpm should be about 10500. I would go to Pro Zinger 15x4 @ 10k instead because when rpm goes beyond 10k, you start to lose the wide blade advantage.
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Old 04-20-2005, 04:21 PM
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Default RE: Saito .82a

Quote:
because when rpm goes beyond 10k, you start to lose the wide blade advantage.
I am confused, can you clarify this statement?
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Old 04-20-2005, 09:53 PM
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Default RE: Saito .82a


Quote:
ORIGINAL: TD1

Quote:
because when rpm goes beyond 10k, you start to lose the wide blade advantage.
I am confused, can you clarify this statement?
I meant to say that wide blade's advantage is more evident at lower rpm.
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Old 05-07-2005, 08:07 AM
  #22
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Default RE: Saito .82a

I am surprised by your statement that wide props lose effectiveness at more than 10,000 rpm, in view of all of the 2 srtoke 3d guys using 12.25x3.75 props at 12-13k rpm (on .46- .50 engines) and loving the heck out of them. What do you base this on?
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Old 05-08-2005, 12:09 AM
  #23
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Default RE: Saito .82a

I was referring to the 14" wide prop for the 10k rpm advantage limit. Sorry for not clarifying this point. It's still very effective at high rpm, but the advantage of wide blade will begin to get overshadowed by a narrower blade turning at higher rpm or larger diameter.
All I was trying to say is that although Saito 82 will turn 14x4W @ 10700 rpm and 15x4W @ 9800 rpm, you get more thrust from 15x4W 9800 rpm than a smaller wide prop at higher rpm. Generally, narrow props are more optimal at higher rpm, and wide props are more optimal at lower rpm.

For the 12.25x3.75, I had a 52 2-stroke that swings it close to 14k, and man, pull is unbelievable. But at that rpm, I think a 13x4 narrow would more justifiably utilize the power.

Well, it's just my opinion. You should try it out for yourself what you really like.
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Old 05-15-2005, 10:16 PM
  #24
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Default RE: Saito .82a



Saito .82

Wildcat YS 20/20

APC 14x4W - 10500RPM's

I've got a little over a gallon through this engine - still running extremely rich. [8D]


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Old 05-25-2005, 03:41 PM
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Default RE: Saito .82a

Do any of you using the 82a have the engine leaking fuel out the front of the engine behing the thrust washer? I thought maybe it was because I was using 30% heli. My thought was early detonation was causing the proble. Who knows but switchted down to 15% cool power and still having the problem. It may not be a problem at all because for sure the front end is getting lubricated. Any ideas?

I general, I love the engine. Its just messy. It has gobs of power for the weight.
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