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Old 07-02-2014, 12:24 AM
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Bob the three easiest ways to go are : turboheader,saito flex pipe you will see it listed in their engine brochures or you can take a straight pipe off one of the saito radials and screw that straight in.Think the thread you need is 12x1.25mm.Any silicone tubing can be used for an exhaust extension off the standard steel slightly kinked piece of pipe that comes off the head as standard.Good luck finding someone here who wants to talk about making your own exhausts up,i tried a long time back,you may have better luck.

Fnq whats the deal with making up exhausts mate,apart from good quality thinwall stainless tubing and a nice bender.It's hard to find someone who will tig it over here and i don't want to buy a tig yet.There are a couple of guys here very keen to do same so we'll see what happens over the next few months.I have three saito engines that would be better off inside the cowling with a custom made exhaust.If anyone feels the same please add some comments and thoughts.
Old 07-02-2014, 12:30 AM
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Damn hit the button twice so what do you say but...anybody thought about the zooorsts(exhausts)yet?any good ideas?

Last edited by Rudolph Hart; 07-02-2014 at 12:34 AM. Reason: woops !
Old 07-02-2014, 02:57 AM
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Originally Posted by Old Fart
Fnq whats the deal with making up exhausts mate,apart from good quality thinwall stainless tubing and a nice bender.It's hard to find someone who will tig it over here and i don't want to buy a tig yet.There are a couple of guys here very keen to do same so we'll see what happens over the next few months.I have three saito engines that would be better off inside the cowling with a custom made exhaust.If anyone feels the same please add some comments and thoughts.
Can't SS be silver brazed? That might be a more viable option than TIG welding. Easier to accomplish in the home workshop.
Old 07-02-2014, 04:34 AM
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Yes you can silver solder the ss pipe but to do that you need to sleeve it,not really practical in the short curvy confines of most cowls i need to bend it well so i can butt weld and tig it.Maybe pickle and polish the stainless too for bling and extra bragging rights ! and man do saito's sound good on a flyby when you do that.
Old 07-02-2014, 04:36 AM
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I've been using Slimline exhaust for most of the apps as they are relatively common and can be used over a range of engine sizes, engine mounting angles and some have smoke capability. As long as the exhaust port has the same orientation, one muffler should work with different size adapter adapters.

In some cases a 90 degree adapter has been all that is required to completely alter the stock exhaust routing. Here's the 90 fit to the nose of my original Skybolt.

Old Fart, if you can fab up some SS exhausts, may have a job or two for you
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Old 07-02-2014, 06:41 AM
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Originally Posted by Old Fart
Your crankshaft should be 8x1.25 mm thread.

Wind your lsn out till it is flush with the lower bevel on the throttle arm and wind the hsn out four turns from fully closed.

ps you can use piano wire for the needle ext.

Kudos OF!

OK last night I got the plane out, filled the tank about half way(guessing by number of cranks), then hooked up the glow plug, and tried to spin it with my starter, no go, not enough oomph to push it past compression, so I get the glove out, and start to flip it. Nothing, not even a burp. So i take the cowl off, make sure I have fuel to the carb, that is good, take the plug out, and looking at the panel I see its in the green but not glowing, so I pull a new plug out, check it, its in the green and glowing, so I put it in. I hook the remote glow up again, and try to start it, again no go, so this time I hook it up direct, and it fired up. It ran a bit, then I went to advance the throttle, it spit fuel out the pipe and quit. Grrr. So I then pull out the plug and see if its flooding, the answer was no, the battery in my field box was weak and couldn't supply enough current. Thats why I couldn't start it with the starter either.

So I grab my glow stick, hook it up, and flip pop VRRoom its running. I adjust the high speed in a bit till its smooth and no longer spitting, then I advance the throttle, smooth and clean all the way through, so I idle down, and pull the glow stick off, and it stops. Dang, just when I thought I had it. I stick it on again, and it starts, so at a higher RPM, I pull it, it stops again. Then I remember your post on the needle settings, so I look it up, and take the plane inside to the work bench since it was getting dark, and adjust the screws like you said, the LSN was 4 1/2 turns out, it is now about 2 turns out. I take it back outside, hook up the glow stick and promptly get smacked in the hand with the prop on a back fire. OUCH, thankfully I use padded gloves. I flip it again, it fires right up. I pull the glow stick and it stays running, did not even drop RPM. Smooth all the way though to WOT. There is just enough light for some taxi tests, so I steer it to the field and start taxi testing it. It handles quite well on the ground and after a bit of driving it, I adjust the HSN, I got a nice increase in RPM, then backed it down just a touch, and it is so smooth through the range, its the smoothest GP engine I have ever had. It purrs at idle, it roars at WOT, and transitions through the range like my car.

So I flip the kill switch, the engine idles down but does not quit. I fiddle with the sub trims, and still can't get the engine to quit. I will have to check to see if its against the throttle stop and maybe adjust it a hair, but it idled at something like 400 RPM. It was going putt putt putt putt putt, sounded like a hit and miss engine. It finally slowed enough to stop running, probably from cooling down. I had a feeling the LSN was way too rich, the few moments the engine ran the wing was covered in oil. I may richen it just a tad to make sure it isnt too lean, but right now this engine is running extremely good.

The guy who sold it to me said he had issues keeping it running and didn't want to futz with it anymore. Looks like all it needed was an adjustment on the LSN. I saw that the HSN was removed from the carb at one point, there are tool marks on the nut. His loss, my gain, thats $185 well spent. Not only that, but the black and gold head sticking out the bottom of the Mustang looks good too. This is one engine I dont mind being exposed on the Warbird.
Old 07-02-2014, 07:15 AM
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Originally Posted by AirmanBob
Has anyone found something that will screw to that to extend the exhaust out of the cowl? Is there some sort of tubing that will slip over the header pipe?
I've always taken the header or muffler down to the auto parts store and fitted it with high temp hose, usually heater hose.
Then I go to the local hardware's plumbing section and find a copper water pipe that's the same size as the header.
Use hose clamps or wire ties along with silicone rubber and voila.

I didn't have a pic of my old 4 stroke extensions but here is a pic of the extensions I made for the ST 2000 we're cleaning up after 25 years of nonuse.

Nick

PS. I've had success finding brass tubing that was a close fit, slotted it with a dremel cut off and hose clamped it to a header too.
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Old 07-02-2014, 07:22 AM
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The previous owner must have used a long extension I guess.
Old 07-02-2014, 07:36 AM
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Nope!
Those are the untouched extensions I put on it 25 years ago.
They haven't come loose once.

Nick
Old 07-02-2014, 08:05 AM
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Well thank you all for your ideas on how to find or make an exhaust system for my FA100 that I recently bought used. It didn't have a header pipe or muffler when I got it and I figured I could make something myself. Wrong. I guess I'll have to buy the parts from Horizon because it turns out their parts are cheaper than after market stuff.

Thanks all,
Bob
Old 07-02-2014, 09:34 AM
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Muffler thread is 12x1mm BTW.

Turboheader mufflers & 90 adaptors are available HERE.
Old 07-02-2014, 09:45 AM
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Many times I have wished to make my own exhaust pieces for my Saito's. If only tap and dies with a 1mm pitch were available... I tried to find a 14mm set for my FA150 recently but no luck.
Old 07-02-2014, 01:59 PM
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Old art, do you live near an airport that has welding facilities available. To be a cewrtified a/c welder you have to have all sorts of equipment and ability that is tested every year. The alternate is a pipe line mob who will have the required equipment and expertise. Or you could just get Christian Traders to supply your needs and you can contribute to the saving of your soul. Christian Traders have adverts in both the OZ magazines
Old 07-02-2014, 04:57 PM
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coffeemug....12 and 14mm metric taps and dies with 1mm pitch are readily available on ebay and many other web sites for around 7 to 14 bucks.

I might give that a try myself....
Old 07-02-2014, 11:26 PM
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Glad you are happy with your engine acdii.Remember to leave the lsn rich while peaking the hsn first.

Fnq yes not far from a good aviation qualified tig guy but it's much better to bend,cut and tack it all up in situ at home in the shed so will see what happens.Thanks to whoever suggested looking for 1mm and 1.25mm thread pitch dies on ebay,that's going to happen.Will try and post some pix of the edge next complete with engine and exhaust fitted so wish me luck i'm not real good at that,and many other things ! it might take a couple of tries so be patient
Old 07-02-2014, 11:31 PM
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Hope this works
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Old 07-02-2014, 11:41 PM
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This is a bit off thread hobbsy but since i've never posted a piccy of my ducati yet maybe it's ok.Plus i just got my camera back so...
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Old 07-02-2014, 11:48 PM
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H
Originally Posted by Old Fart
This is a bit off thread hobbsy but since i've never posted a piccy of my ducati yet maybe it's ok.Plus i just got my camera back so...
Hi there O.F. have you hit any of those furry jumping things with that bad boy? I think there called kangaroots !Cheers the pope
Old 07-03-2014, 12:59 AM
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Pope no i hav'nt.Skittled a bush chook (emu) just before christmas tho took ages and some swearing to clean it all off.It was a three can job so it must have taken at least an hour

ps forgot to say when you first fire it up the damn thing sounds like a fifty cal desert eagle on full auto,the next door neighbor loves it going by the expression on his face.Looked like a bulldog chewing a bee mate !

Last edited by Rudolph Hart; 07-03-2014 at 01:15 AM.
Old 07-03-2014, 04:52 AM
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Interestingly, like Saitos there are different cylinder configurations. Your Duck is a 90 degree V-twin my Sporty is a 45 degree V-twin and the new Harley 500 Street is a 60 degree V-twin and is currently mfd in Kansas City, Mo. The 750 is made in India.

I like those exhaust stacks on that plane, you have lots of tools and lots of stuff, that is good.
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Last edited by Hobbsy; 07-03-2014 at 04:55 AM.
Old 07-03-2014, 04:56 AM
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Originally Posted by Old Fart
Hope this works
Hi OF

Is this a FG-57?

(I actually posted a question on your experience on FG-57 to another thread, I do not know if you have seen it)

-Artto

Last edited by AeroFinn; 07-03-2014 at 08:45 AM.
Old 07-03-2014, 08:25 AM
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Hello all,

I went up to Horizon Hobby and looked at a Saito 72:
http://www.horizonhobby.com/webapp/w...pe=productgrid

When I did, it also showed the Upgrade Carb Rebuild Kit SAI72144 My question is this a rebuild kit for the stock 72 or is it a necessary improvement on the system that comes with the engine??

Thanks,

Bob
Old 07-03-2014, 09:17 AM
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Bob, I ordered the, "upgrade" kit for my old high compression .80, it looked identical the original but cleaned up the midrange so there is a difference.
Old 07-03-2014, 12:15 PM
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Thanks for the input, Hobbsy. I'll get one - I was just curious if this 'upgrade' was already installed in the newer 72's. Thanks.

Bob
Old 07-03-2014, 04:03 PM
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Old Fart for those small dies and taps check out Blackmoors or Tool Industry Supplies or the Man's Toy Store in Rockhampton. Have got a couple of small sets, one to lend and my own set that don't leave my workshop. These toys are not cheap but the good ones are good.

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