Welcome to Club SAITO !
10-04-2011, 12:43 PM
RE: Welcome to Club SAITO !
ORIGINAL: jknox
Update on the crashed 125. Determined bent crank and at least one distorted ball bearing in additon to above. Price to repair now almost 90% of new engine. Sadly it looks like it's finished. [img][/img]
Update on the crashed 125. Determined bent crank and at least one distorted ball bearing in additon to above. Price to repair now almost 90% of new engine. Sadly it looks like it's finished. [img][/img]
10-04-2011, 03:21 PM
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RE: Welcome to Club SAITO !
Lars,
That tool looks interesting and very useful.
Can you give any details on how it is made - like diameters of the tubing, etc.?
Thank you ahead of time,
Krop
That tool looks interesting and very useful.
Can you give any details on how it is made - like diameters of the tubing, etc.?
Thank you ahead of time,
Krop
10-04-2011, 03:39 PM
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RE: Welcome to Club SAITO !
must have been a whale of a crash. In dozens of totaled airplanes, I've never bent a crank, although I've stripped teeth off, destroying them that way...
Very sorry for the loss of a great and expensive engine. I buy them used, usually, and the ability to work on them really helps. Now you've taken one apart and see that's easier than you thought.
Very sorry for the loss of a great and expensive engine. I buy them used, usually, and the ability to work on them really helps. Now you've taken one apart and see that's easier than you thought.
10-05-2011, 04:23 AM
RE: Welcome to Club SAITO !
Yeah mike it seems easy to bend a crank even i can do it.Hoping jknox will post the leftovers of his 125 here and eventually will have enough bits to make my own one.Have run a couple in for mates and they really hum out of all proportion for their size,sound sweet.
10-06-2011, 05:23 PM
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RE: Welcome to Club SAITO !
Strange discovery today while resetting the valve lash. Right after the exhaust valve closes I have .004", all the rest of the way around I have .002". This does not occur on the intake valve.
Cory
Cory
10-06-2011, 06:58 PM
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RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
Cory, I have an extra 1.50 cam and I'll take a picture tomorrow, it might splain.
Cory, I have an extra 1.50 cam and I'll take a picture tomorrow, it might splain.
Thanks
Cory
10-07-2011, 03:31 PM
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RE: Welcome to Club SAITO !
Cory, envision this cam turning CCW as we look at the back of it. The trailing side of the exhaust cam is nearly flat, meaning that the exhaust valve closes much quicker than it opens. Looking at the base circle it appears that the base circle is smaller in diameter right after the closing then is ever so slightly larger from that point until the opening ramp. This area right after the closing has to be where you're seeing the .004". When I replaced the 1.50s cylinder due to ham fisting the intake jam nut I thought the intoake lobe on the cam was worn out since it wasn't sharp pointed like the exhaust lobe. How wrong I was, the new cam is exactly the same. Sharp point on exhaust cam and nearly flat trailing side more visible in picture #2.
10-07-2011, 05:44 PM
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RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
Cory, envision this cam turning CCW as we look at the back of it. The trailing side of the exhaust cam is nearly flat, meaning that the exhaust valve closes much quicker than it opens. Looking at the base circle it appears that the base circle is smaller in diameter right after the closing then is ever so slightly larger from that point until the opening ramp. This area right after the closing has to be where you're seeing the .004''. When I replaced the 1.50s cylinder due to ham fisting the intake jam nut I thought the intoake lobe on the cam was worn out since it wasn't sharp pointed like the exhaust lobe. How wrong I was, the new cam is exactly the same. Sharp point on exhaust cam and nearly flat trailing side more visible in picture #2.
Cory, envision this cam turning CCW as we look at the back of it. The trailing side of the exhaust cam is nearly flat, meaning that the exhaust valve closes much quicker than it opens. Looking at the base circle it appears that the base circle is smaller in diameter right after the closing then is ever so slightly larger from that point until the opening ramp. This area right after the closing has to be where you're seeing the .004''. When I replaced the 1.50s cylinder due to ham fisting the intake jam nut I thought the intoake lobe on the cam was worn out since it wasn't sharp pointed like the exhaust lobe. How wrong I was, the new cam is exactly the same. Sharp point on exhaust cam and nearly flat trailing side more visible in picture #2.
This brings up a very interesting point. The Saito instructions don't specify a point where the valve lash is to be set, this leaves a really big range as to where the exhaust valve can be set and still be within spec. Kinda wish I'd checked it in a few more places with different feelers.
Oops, forgot to measure the life while I was there too.
Cory
10-07-2011, 06:08 PM
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RE: Welcome to Club SAITO !
As I mentioned earlier I've been setting mine at .004", at TDC on the compression stroke since my first 1.50 in 1991, it's not an issue to go nutso over, I'm sure there are many that have never even been checked and run fine. They don't change much after the first time.
10-07-2011, 08:43 PM
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Mine were set at .002" TDC since it was the easiest way to be sure I was off the lobes. I like to fiddle with such things.
Cory
Cory
10-08-2011, 04:10 AM
RE: Welcome to Club SAITO !
Dave i see saito have a 56 size control line version,different carby?.Over her i've just seen an ad for a 3d version of the same engine,is it pumped?
10-08-2011, 04:12 AM
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Cory, this was my first toy engine, it only had one valve to set and I think any setting that wouldn't let the pushrod fall out was OK. I was about 13 years old then. It was 200 cu. in., 3.5hp at 350 rpm. A far cry from this one which has about the same HP.
10-08-2011, 04:25 AM
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RE: Welcome to Club SAITO !
G'day OF. No, the 3D version of the 56 simply has a smaller carby throat for better fuel draw. I did see the actual sizes somewhere recently but I don't remember where.
Cheers
Mike in Dubbo (Oz)
Cheers
Mike in Dubbo (Oz)
10-08-2011, 06:24 AM
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RE: Welcome to Club SAITO !
I have a 56F, there is no pump and the venturi is about 1mm smaller, otherwise it is the same engine as the standard R/C 56. They don't sell the 56F in the US for some reason.
10-08-2011, 06:50 AM
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RE: Welcome to Club SAITO !
ORIGINAL: Hobbsy
Cory, this was my first toy engine, it only had one valve to set and I think any setting that wouldn't let the pushrod fall out was OK. I was about 13 years old then. It was 200 cu. in., 3.5hp at 350 rpm. A far cry from this one which has about the saem HP.
Cory, this was my first toy engine, it only had one valve to set and I think any setting that wouldn't let the pushrod fall out was OK. I was about 13 years old then. It was 200 cu. in., 3.5hp at 350 rpm. A far cry from this one which has about the saem HP.
Cory
10-09-2011, 12:04 PM
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RE: Welcome to Club SAITO !
Hi Guys,
A while back, I wrote a post about having trouble with getting my muffler through my H9 Cub cowl. As you can see from the picture, my muffler is a little too close to the fuse/cowl and I'll have to cut a lot of this away using the existing exhaust manifold. I know that it looks like I could squeeze by, but that's just the angle that I took the photo at.
Any ideas on extending that manifold perhaps 1/4" or so so that I don't have to chop the daylights out of the cowl?? The engine is a Saito .82 - I put the extra power in there so that I could use the Cub on floats.
C'mon, fellow geniuses.... I could use an idea or two here...
Bob
A while back, I wrote a post about having trouble with getting my muffler through my H9 Cub cowl. As you can see from the picture, my muffler is a little too close to the fuse/cowl and I'll have to cut a lot of this away using the existing exhaust manifold. I know that it looks like I could squeeze by, but that's just the angle that I took the photo at.
Any ideas on extending that manifold perhaps 1/4" or so so that I don't have to chop the daylights out of the cowl?? The engine is a Saito .82 - I put the extra power in there so that I could use the Cub on floats.
C'mon, fellow geniuses.... I could use an idea or two here...
Bob
10-09-2011, 12:51 PM
RE: Welcome to Club SAITO !
Rotate your engine and mount maybe 15 degrees or so CCW and the muffler will likely move outboard enough to clear the cowl. Sounds drastic, but the engine will still be in the cowl and no one will notice it rotated Just drill four new holes and put in "T" nuts and your ready to go. Good luck.
Sincerely, Richard
Just drill four new holes and put in "T" nuts and your ready to go. Good luck.Sincerely, Richard
10-09-2011, 01:29 PM
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RE: Welcome to Club SAITO !
Thanks, Spaceworm and OF. Actually, the original engine was already rotated but I was going to have to cut away way too much of the cowl - that's why I made the mount totally inverted instead of slanted.
I'll look into that flex pipe, but is there a way to tap the pressure off if it for the tank, OF? I'm not really comfortable with leaving the muffler off, due to noise restrictions at our field.
Bob
I'll look into that flex pipe, but is there a way to tap the pressure off if it for the tank, OF? I'm not really comfortable with leaving the muffler off, due to noise restrictions at our field.
Bob
10-09-2011, 03:30 PM
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RE: Welcome to Club SAITO !
Maybe something like this.
http://www.horizonhobby.com/Products...rodID=SAI8075C
Looks like its a bit longer.
http://www.horizonhobby.com/Products...rodID=SAI8075C
Looks like its a bit longer.
10-09-2011, 03:31 PM
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RE: Welcome to Club SAITO !
ORIGINAL: N1EDM
Hi Guys,
A while back, I wrote a post about having trouble with getting my muffler through my H9 Cub cowl. As you can see from the picture, my muffler is a little too close to the fuse/cowl and I'll have to cut a lot of this away using the existing exhaust manifold. I know that it looks like I could squeeze by, but that's just the angle that I took the photo at.
Any ideas on extending that manifold perhaps 1/4'' or so so that I don't have to chop the daylights out of the cowl?? The engine is a Saito .82 - I put the extra power in there so that I could use the Cub on floats.
C'mon, fellow geniuses.... I could use an idea or two here...
Bob
Hi Guys,
A while back, I wrote a post about having trouble with getting my muffler through my H9 Cub cowl. As you can see from the picture, my muffler is a little too close to the fuse/cowl and I'll have to cut a lot of this away using the existing exhaust manifold. I know that it looks like I could squeeze by, but that's just the angle that I took the photo at.
Any ideas on extending that manifold perhaps 1/4'' or so so that I don't have to chop the daylights out of the cowl?? The engine is a Saito .82 - I put the extra power in there so that I could use the Cub on floats.
C'mon, fellow geniuses.... I could use an idea or two here...
Bob
10-09-2011, 03:45 PM
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RE: Welcome to Club SAITO !
Thank you! I have just returned from two weeks of rest and relaxation. Toured northern New York, Vermont, New Hampshire and Maine.
10-09-2011, 03:52 PM
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No sandbagging here, Ijust stumbled across this forum a couple of months ago.
Amazing the number of messages that accumulate while a person is away. I'll be reading for the rest of the evening!
Amazing the number of messages that accumulate while a person is away. I'll be reading for the rest of the evening!