Strange sound
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RE: Strange sound
No, going all the way back to the big head Saito 1.20 has aluminum seats so does the Saito 1.50 I saw that in the SEM and with the naked eye. Both of my twin DP300s also have aluminum seats
My smaller 40 45 65 an 72 all have brass valve seats. My 1.30 twin has bass seats.
Saito air pours his castings and is willing to take the hit with porosity formation. Now should a head and cylinder get past QA Saito is very fast at correcting the problem
My smaller 40 45 65 an 72 all have brass valve seats. My 1.30 twin has bass seats.
Saito air pours his castings and is willing to take the hit with porosity formation. Now should a head and cylinder get past QA Saito is very fast at correcting the problem
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RE: Strange sound
Not the 1983 model. I ported mine, cut the case 1mm to up the CR and reground the cam. I was nose to seat trying to get the performance of that original broom stick cammed Saito to match the performance of the great Enya R1.20.
Its aluminum!
Its aluminum!
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RE: Strange sound
I've found that all-castor is OK for engines running full-bore 90% of the time, but my 4-strokes are normally run below 50% throttle and don't run well with much castor. My heli engines don't tolerate castor beyond a couple percent in the mix. Having a well-maintained motor isn't of much use when the heli it's in is on its side due to the engine bogging at a crucial moment. [X(]
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RE: Strange sound
Sounds more like a tuning issue. Are you thinking that you are actually burning the synthetic oil? Why would castor oil foul your plug any more than synthetic?
Now my helis tend to over heat without castor oil rather than have a throttle responce issue. I also tried a Saito 45 as a substitute for an OS 28 in a Hirobo Shuttle. As the Saito had an automixture carb the heli flew ok for a dual flapping head heli. I couldn't fly helis at the time so I had to observe from the side lines. I thought the power was less but she did not over heat. Again this was at 5K to 6K feet of altitude
Due to the lower rpm potintial of the 4 cycle engine 12K verse 17K rpm we used longer blade (about 30mm) and more pitch. I was carving wooden blade on a drill press with a drum sander It took in about an hour to form a set of balanced blades.
Now my helis tend to over heat without castor oil rather than have a throttle responce issue. I also tried a Saito 45 as a substitute for an OS 28 in a Hirobo Shuttle. As the Saito had an automixture carb the heli flew ok for a dual flapping head heli. I couldn't fly helis at the time so I had to observe from the side lines. I thought the power was less but she did not over heat. Again this was at 5K to 6K feet of altitude
Due to the lower rpm potintial of the 4 cycle engine 12K verse 17K rpm we used longer blade (about 30mm) and more pitch. I was carving wooden blade on a drill press with a drum sander It took in about an hour to form a set of balanced blades.
#32
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RE: Strange sound
Konrad
What?
I was commenting on castor verses synthetic. What does engine brand have to do with it? Now some engines have silicone components that one needs to be aware of.
What engines am I discussing and what is my stance on those engines. If I make a claim or statement I usually support it in the text of the post. So what is your issue with what I've post in this thread?
P.S.
No I haven't had the chance to look at this mystical form ''User Reviews''. Can you post a link?
What?
I was commenting on castor verses synthetic. What does engine brand have to do with it? Now some engines have silicone components that one needs to be aware of.
What engines am I discussing and what is my stance on those engines. If I make a claim or statement I usually support it in the text of the post. So what is your issue with what I've post in this thread?
P.S.
No I haven't had the chance to look at this mystical form ''User Reviews''. Can you post a link?
This thread was originally focussed on problems with the OP's Saito 1.25.
There is some good stuff in these "mystical" User Reviews. Don't knock em until you've given them a look.
#33
RE: Strange sound
Was going to try and fly one last year if i could bolt the zuess goose into it.They said heli's already vibrate to much and shed parts with ease,so the 220 is still on the bench.
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RE: Strange sound
BLW,
Yes, this did get way off topic.
I was not knocking the form. Just indicating that I could not find it looking for it here.
http://www.rcuniverse.com/forum/forumid_463/tt.htm
That and the history with the poster lead me to use the term "mystical". Mythical might have been a better word.
I'm sure there is some good data. But as with all that is posted on the web that is not subjected to peer review, one must work hard to separate the wheat from the chaff.
All the best,
Konrad
Yes, this did get way off topic.
I was not knocking the form. Just indicating that I could not find it looking for it here.
http://www.rcuniverse.com/forum/forumid_463/tt.htm
That and the history with the poster lead me to use the term "mystical". Mythical might have been a better word.
I'm sure there is some good data. But as with all that is posted on the web that is not subjected to peer review, one must work hard to separate the wheat from the chaff.
All the best,
Konrad
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RE: Strange sound
I have the exact sameproblem with my Saito 125. The sound started shortly after initial break in. I probably had about one gallon through it. I rechecked the valves and they were good. I also lubricated the rockers and push rods again. I flew it several more times with good results but that sound came back shortly after that. I started pumping automatic transmission fluid into the crank case vent after every flight and that sound has not returned. The engine seems to be running fine ever since and I have been flying on a regular basis all summer.
#36
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RE: Strange sound
Konrad-
What do you mean about it flying okay for an articulated system?
Either way, 'mystical' or 'mythical' are inappropriate terms for the reviews. I've heard of peer reviews in the scientific and medical world, but not model airplane engines. Anyway, just wanted to set the record straight here. The review comments hold just as much validity as any you would make yourself. Many RCU reviewers put a lot of effort into their work.
Cornduster,
The 125 is great engine. Some are known to be pounders until you get them broken in and leaned out. Others are pretty smooth from the beginning. Mine is the first version. It won't tolerate poor tuning.
What do you mean about it flying okay for an articulated system?
Either way, 'mystical' or 'mythical' are inappropriate terms for the reviews. I've heard of peer reviews in the scientific and medical world, but not model airplane engines. Anyway, just wanted to set the record straight here. The review comments hold just as much validity as any you would make yourself. Many RCU reviewers put a lot of effort into their work.
Cornduster,
The 125 is great engine. Some are known to be pounders until you get them broken in and leaned out. Others are pretty smooth from the beginning. Mine is the first version. It won't tolerate poor tuning.
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RE: Strange sound
You got me on the articulated system. Where did I use that term? (Could it be some spell checker helping with the term antiquated?)
Yes, my views are no more important than those of others. Now some of us have a deeper understanding and can critique system interaction and failures better than others. For example; I have seen many folks claim radio failure when they crash. But when viewed by others the plane is in a full stall with the radio sticks in the corner. So what I'm saying is that the public might not be the "best" source. One needs to look at the criteria used in making the assessment (review).
Yes, my views are no more important than those of others. Now some of us have a deeper understanding and can critique system interaction and failures better than others. For example; I have seen many folks claim radio failure when they crash. But when viewed by others the plane is in a full stall with the radio sticks in the corner. So what I'm saying is that the public might not be the "best" source. One needs to look at the criteria used in making the assessment (review).
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RE: Strange sound
Coming back to topic.Selnekav, you said the sucking noise happens after leaving the engine running for a while at idle.OK, it could be oil trapped in your breather tube or you're running the idle a bit rich causing residual fuel in the carb thus making the sucking noise. I would explore that first before i strip the engine.If the bearing is shot, it would be noisy at the start to finish of the engine run.
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RE: Strange sound
BTW saitos are nice but they are rust buckets.you need to flush them out when you don't fly often or put in lots of after run oil. i got tired of changing bearings that i switched to ceramics long ago. i flush my engines regularly as i am very particular about how my engine looks inside and out.
#41
RE: Strange sound
Call me crazy i always worry about the sound saitos make,they bark nice and right now i have one making a sound not heard before.It's not so much harmonic or piston/crank/cam gear speed but random and regular,crank touching the plastic backplate under throttle?
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RE: Strange sound
Off topic. But the old blue head (canopy) Shuttle did not use a single piece feathering spindle. But rather used two independent feathering spindles. This allowed the each individual blade to flap individually. The single feathering spindle performed much better.
So in this thread I did not use the term articulated, correct?
We should take this off line. PM if you still have questions
So in this thread I did not use the term articulated, correct?
We should take this off line. PM if you still have questions
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RE: Strange sound
That might be so.
But the old Shuttle was a dual flapping head.
It is more accurately called a dual dampened flapping (DDF) head. I'll give you that.
All the best
But the old Shuttle was a dual flapping head.
It is more accurately called a dual dampened flapping (DDF) head. I'll give you that.
All the best
#47
RE: Strange sound
ORIGINAL: Old Fart
Call me crazy i always worry about the sound saitos make,they bark nice and right now i have one making a sound not heard before.It's not so much harmonic or piston/crank/cam gear speed but random and regular,crank touching the plastic backplate under throttle?
Call me crazy i always worry about the sound saitos make,they bark nice and right now i have one making a sound not heard before.It's not so much harmonic or piston/crank/cam gear speed but random and regular,crank touching the plastic backplate under throttle?
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RE: Strange sound
This morning a flying friend of mine brought a new Saito 115 to the field, it has about eight tanks of fuel through it. During mid flight it began tomakethe horrible soundmy Saito 125 made when I was breaking it in. He was disgusted, pulled the motor and shipped it back to the factory this afternoon. We areboth anxious to hear what Saito has to say about the problem.
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RE: Strange sound
Update :
last week i pumped 50 cc oil into the crankcase, and then i put the airplane on it nose so the oil will pass the rear bearing into the camgear.
then yestrday i start it, and the noise disappear.... i was ablwe to fly few times i hope it will stay like that.
thanks,
last week i pumped 50 cc oil into the crankcase, and then i put the airplane on it nose so the oil will pass the rear bearing into the camgear.
then yestrday i start it, and the noise disappear.... i was ablwe to fly few times i hope it will stay like that.
thanks,