blw

My Feedback: (3)

It's hard to say exactly when each engine has really started breaking in. Maybe a gallon of fuel and it's just about broken in. It will get slightly better over the next gallon.

Hobbsy

My Feedback: (102)

Mike, Saito considers them flyable in 40 minutes.

Michaelh

My Feedback: (4)

Nice , I just got another plane that is going to need yet another Saito .82 on it
Got some more footage of the .82, going to haft to get some of mine with the THM .

scosby

Gentlemen, I have read a lot of this thread, but not all of it. It seems that everyone (understandably) has a different opinion on what fuel to use. I have acquired several Saitos within the last few months, changed over from 2-Strokes (still have 2 ,OS's 46AX,.61FX) in Pylon planes . I like Byrons 15% fuel for the 2-strokes, It seems to have more power than Omega15% and runs a little cleaner. My Saitos are 1- FA 100, 1-91, 1-82, 1-56, 1-40, 1-30. The .82 is new and the rest are like new. The 100 has about 1 gallon of PM 20/20 through it. Would I be wise in running PM 20/20 in all, or would PM 4-Stroke (15% Nitro 15% Synthetic/Castor), or Byrons 4-Stroke(15% Nitro 16% Synthetic/Castor) work just as well? I do use afterun oil. Also I would like to become a member of the club.

Thanks for your help.
Steve

Hobbsy

My Feedback: (102)

SC, I primarily run WildCat fuel with 18% 80/20 blend but last summer I got a deal on 6 gallons of PM 15% with 18% 80/20 blend. It ran fine in my Saitos but I'm back to the WildCat simply because its easier to get.

w8ye

My Feedback: (16)

Steve

Any of the fuels you mentioned should be fine

I ran Omega 15% for several years then Rich's Brew 15% with the 80/20 oil blend
Now I have Wildcat Super Premium 15% with the 80/20 oil.

They all ran the same to me.

Hobbsy

My Feedback: (102)

Hey Jim, I was going to call you today but I've got a bad sore throat, (is there a good one), and can hardly talk. Bobby has two cases of WildCat 15% Premium Extra for me, I'm going to pick it up when my Saito 1.15 comes in.

w8ye

My Feedback: (16)

I went flying Saturday with my Son-in-law and flew the LT-40 tail dragger with a OS 52. There was like a 10 knot steady wind blowing. The OS was bad about surging at first. At least the Saito engines are not so bad about the surging. There was another guy there with a DA 50.

Capt Lou

Scosby:

You have asked the question for which there is no absolute answer and you will get as many definitive answers as the number of answers you receieve. I have used Cool Power 15% 4Stroke, Power Master 20/20, and Cool Power 30% heli in my .65, .72, .91, and 1.00 Saito. I found that the Cool Power 15% 4 stroke does great. It is cheaper than Power Master and 30% heli and is works as effectively. My next choice is the Power Master 20/20 but it is about $10 more per gallon than Cool Powewr 15%. Lastly, the 30% heli give you more nitro but I believe the extra boost is not needed and it is priced similar to Power Master. The bottom line is go with the Cool Power 15% 4stroke.

balsaeater

Sorry only one Saito 180 with standard muffler


figure the next one is the 220 glow as I would need to do a serious lot of flying to make back the fuel costs of buying the gasser

below 180 I mostly do electric

blsaeater

otrcman

I recently bought a gasket set for an 80 and found that it did not include the cylinder base gasket. When I called Horizon, they said that the cylinder base gasket is no longer used just go metal to metal. I guess that's fine with me, but I wondered if omitting the gasket doesn't increase compression slightly and would that lead to more backfires? I recall some time ago a friend had a 65 which was very bad about backfiring and spitting the prop. He eventually put a .015 shim under the cylinder base and the engine became much better behaved at very little loss of power.

Any thoughts?

Thank you, Dick Fischer

mike early

My 125's tach numbers are not very impressive after 2 gallons. I've tried a few props and compared the #'s to what others have posted in various forums/threads.
I have to assume the 13mm flex pipe that I am using is not as efficient as the stock muffler.

I have been led to understand the 125 muffler is very good, as compared to aftermarket mufflers that increase power on all the other Saito engines. These mufflers do not increase power over the stock one. So comparisons of another engine with stock muffler vs flex pipe does not really apply... Unless even on other engines, the flex pipe robs power.

Has anyone compared tach numbers of mufflers vs flex pipes?

Thanks!

Hobbsy

My Feedback: (102)

Dick, I have yet to find a base gasket on any Saito, and as for reducing the compression, I have an early Saito .80 that has 15.6 to 1 compression and would not think of lowering it. Just use a little less nitro, my .80 will run on 5% very well. maybe I'm Ole School but when it comes to compression to much is just right.

blw

My Feedback: (3)

Mike,

Is this the flex pipe with the pressure nipple? Also, did you retune the engine when you put on the flex pipe?

mike early

blw,

The 13mm flex pipes do not come with the nipple. I have installed one, however.
The engine has only been tuned with the flex pipe. I could take off the cowl and install the muffler, tune it and get some prop numbers with which to compare, but I was hoping someone else had already tried this.

RC Specialties

Mike,

It sounds like you need to try the stock muffler and see if you get numbers that are comparable to other 1.25's. This will tell you if it is the flex pipe. Also compare the ID of the stock header pipe to the flex pipe. If the flex pipe is smaller the engine isn't breathing like it should. This engine needs allot of flow. There are drawbacks and advantages with every muffler option. By the way have you posted the numbers you are getting? I went back a couple of pages and didn't see them.

Jim

mike early

APC 16x6 about 7900 RPM max

RC Specialties

If your engine is tuned properly, I would check it with the stock muffler and see where you are then. I am running an APC 15x8 and getting about 9150. You should be in that range.

Jim

rexracer

Have you checked the valves? If they are way loose, I could see getting those #s. From what I've seen, you should be getting close to 9000 rpm on an APC 16x6 with 15%

mike early

I've checked the valves. I tried the K-Series 15x8 and was getting about 8300.
I'm currently running Wildcat 20/20.
I have to assume the flex pipe has a negative effect on performance.

rexracer

I guess it's time to swap pipes, and see what you get.

mike early

The flex pipe broke on me today. There was maybe 10ΒΊ of deflection in it. Not like I was making a right angle with it or anything. Only ran it about 6 times. 44 dollars. Damn.

Anyways, I think it's probably the 90ΒΊ Elbow having more effects on airflow than the flex pipe. We'll see if we can get this stock muffler inside the cowling.

otrcman

Thanks for the input, Hobbsy. C. R. is 15.6? No wonder it's so hard to turn over !

When I took this engine apart to replace a bearing, there was a gasket at the cylinder base. It must be a really early unit.

Dick

mike early

The plane is the VQ P-40. It appears the muffler will touch the inside of the cowling very lightly. Will it melt the fiberglass? Will the vibration beat it to hell?
I could do the cigar-in-shark's mouth thingy and have the muffler outside the cowl, that would also eliminate the 90ΒΊ bend... But I'd rather keep the cowling intact. I have a custom painted cowling coming.

RC Specialties

Mike,

The flex pipes are known to break. The muffler even close to the cowl could cause discoloration. That aircraft is tough to put an in cowl muffler in. There just isn't much clearance. I don't think the 90 is causing your performance problems. Remove the cowl and try the stock muffler to make sure the engine is fine. Then tackle the muffler problem. There is a thread for that airplane. See what other guys are doing there.

Jim