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RE: New SV Gassers - 12/21/2009 10:59 PM   
opjose



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ORIGINAL: yellowbird911

I can tell you personally I would stay clear of the sv motors. I bought a SV90 motor which was very impressive for about 8 flight until the piston broke which pretty much destroyed the motor. Of course troybuilt who sells the motors does not carry any parts for them so it will have to go back to China. I emailed SV Group and got no response, as expected. I will never buy another motor that parts are not avaliable for, what a waste of over 425.00 dollars. I'm pissed. Just ordered a DLE111, at least parts can be purchased.


On one hand I agree with you....

I had a SV .26 with over 100 flights in it, and one day the crankshaft split in two after I started the engine.

Now the plane had nosed over with the engine running a few times, so it is possible that this lead to developing a crack in the metal, but that said only Wooden props were used, and I can't imagine that the heavy metal crankshaft should have sheered without first demolishing the props that absorbed all of the damage.

Because of no available parts, I simply replaced it with another identical SV .26, and given the low cost of the motor that was probably cheaper than trying to repair it anyway.

There are other Chinese engine vendors which do provide parts for their engines however.

e.g. HobbyCity/Hobbyking tends to have all sorts of parts for their engines and I have successfully used their carbs and ignitions on other engines.



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RE: New SV Gassers - 3/23/2011 12:39 AM   
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Status: offline 		anyone know what type of spark plug the sv26cc engine takes???

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RE: New SV Gassers - 3/23/2011 6:21 PM   
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RE: New SV Gassers - 3/23/2011 6:56 PM   
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RE: New SV Gassers - 3/23/2011 7:04 PM   
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RE: New SV Gassers - 3/23/2011 7:06 PM   
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Status: offline 		on your sv26cc?? calls for a NGK BPMR6F spark plug...

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RE: New SV Gassers - 4/9/2012 7:01 AM   
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Status: offline 		That's the correct Plug, now does any one where you can get it? I have tried to cross reference it to an Autolite, Champion, Bosch to no avail..all I can find is NON resistor types & they WILL not work! Too much interference! Help Please!

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RE: New SV Gassers - 4/9/2012 1:24 PM   
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RE: New SV Gassers - 4/11/2012 1:06 AM   
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Status: offline 		ebay. Tried finding the champion around here and could only find the non resistor versions. Ordered a bunch a while back so I'm stocked up.

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RE: New SV Gassers - 4/11/2012 1:57 AM   
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Status: offline 		I only use NGK or Bosch. Champion is not what it used to be.

I havn't used Champions in 10 years but I always had to order the resistor ones. They always came the next day. I got them at NAPA.

The local Advance Auto stocks the NGK  BPMR plugs but not CM6. The next fartherest away (7mi) Advance Auto stocks the CM-6 plugs. O'Rielley's is cheaper but you get them the next day.


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RE: New SV Gassers - 12/6/2012 5:18 PM   
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Status: offline 		I guess this thread has died..like all The SV engines & suppliers..
Anybody still have one running?
Would anybody like to buy a couple of good ones, running & tuned? 


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RE: New SV Gassers - 12/6/2012 8:50 PM   
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Status: online 		The engines pop up from time to time on Ebay, etc.  I think they are called RCS engines now as I have seen what look like the same engine being sold under that brand.  Hobby King is selling the RCG 26cc engine which looks pretty much identical to the SV  26cc engine.
I remember seeing a Canadian online store selling SV engines earlier, but I haven't located it yet.


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RE: New SV Gassers - 12/7/2012 12:25 AM   
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Status: offline 		Mine (I bought 6 from Troy Built Models, TBM) all ran eventually!  LOL, one had a pluged charge port out of the crankcase, one had a stopped up hi jet, ALL need timing adjustment & plug change, NKG or Bosh resistor type, I sold all but 2 of them mounted on planes (warbirds) & still have two left. One is on a CG YAK, other for a spare.  The carbs that come on them will work, i.e., they'll run, but they run better if you put a REAL Walbro on 'em. 
I was jus wondering if anybody was still tryin to sell 'em &/or to run 'em. 
Thanks for your response, kinda suprised me that anybody was payon attention! 


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RE: New SV Gassers - 12/7/2012 2:04 AM   
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Status: offline 		I got my SV100 from troybuilt in 08 I think,when they had their last one up for sale I missed it buy a few days,I have had very good performence with this engine,it is mounted in a 120' Ziroli AD skyraider,48lbs and pulls it to the max(no 3D)flying scale.I can not find any other HBS that carries them,there is a site in mainland china I'll have to look for it and get back with it.OH YA I am running 100LL avgas and 35:1 penz air cooled at 6100' alt for 3 yrs.no problems.

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RE: New SV Gassers - 12/7/2012 2:15 AM   
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Status: offline 		Here we go www.aliexpress.com-store-602744 try that one guys.

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RE: New SV Gassers - 12/7/2012 3:52 AM   
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Status: online 		Here is one of the Canadian stores that sell them.
http://www.amr-rc.com/index.php?path=content&SC=produits&SUBSC=engines&marque=SV&produit_categorie_id=3&produit_sous_categorie_id=&page=produits_marque&langue=en



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RE: New SV Gassers - 12/7/2012 4:17 PM   
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Status: offline 		 I have several SV-26's that I have never been able to get to run right. I have reset the timing, put FULL kits in the carbs & in order for them to run at all I have to open the hi speed needles about 3 + turns!! Mine came with chokes.
Anybody know of a carb to fit them? I have tried to find replacement carbs; tried a WT433, but no charge port, put plate on with charge port & still no run! I have checked the reeds, applied RTV  gasket sealer to the carb insulator blocks, etc. 
Any help would be appreciated. I'm sick of foolin with 'em!! About to give up!
 I'm tempted sell them to somebody dumber than I am or sell 'em to junk out for parts!!!


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RE: New SV Gassers - 12/7/2012 4:36 PM   
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Status: offline 		the BPM plug is longer than the CM-6,but remember to change over you must also change the caps.CH-ignition carries a kit to do so,I had to change over on my SV100,instruct sheet comes with it.and in my case going from a long reach to short I had to machine .015 off the plug seat base of the heads so the spark would not arc out on the head.just a lil more info,the engine runs perfect.

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RE: New SV Gassers - 12/7/2012 4:52 PM   
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quote:

ORIGINAL: rebranger

 I have several SV-26's that I have never been able to get to run right. I have reset the timing, put FULL kits in the carbs & in order for them to run at all I have to open the hi speed needles about 3 + turns!! Mine came with chokes.
Anybody know of a carb to fit them? I have tried to find replacement carbs; tried a WT433, but no charge port, put plate on with charge port & still no run! I have checked the reeds, applied RTV  gasket sealer to the carb insulator blocks, etc. 
Any help would be appreciated. I'm sick of foolin with 'em!! About to give up!
 I'm tempted sell them to somebody dumber than I am or sell 'em to junk out for parts!!!




Some of the carbs get their pulses for the pump from a internal hole or passage routed up through the base of the carb. Other engines may run a short tube proividing pulses from the crankcase to the carb base adapter or heat block plate/spacer for that purpose too. Then some engines run a tube from the crankcase to a fitting on the pump cover to provide it with pulses.

The most common problem is getting the base gasket reversed blocking off the pulse passage sending pulses to the pump. That is on those carbs using this method. If the engine uses a short tube going to the base of the carb or mounting block, then it might have the same problem too.

For the external method, you need to re-use the pump cover with the fitting on it and move it to the different carb or install a new fitting on the new carb;s pump cover.

Now then some carbs come with no choke. But they may use a external primer bulb or they may have the primer bulb built in too. Some carbs may be setup with both too.  I did it to myself too, but it is easy to route the fuel line to the wrong fitting on the carb where you have both a external primer bulb and a fuel inlet fitting.  I sort of like a primer bulb versus using  a choke.

The carb on my example engine was working Ok. But I'll look later and see if I can come up with some other suitable carbs one could use too.

Oh yeah, one other thought it the Reed valve unit might have a problem and not be closing correctly or closing good. So maybe checking out the reed valve for flashing or other things that might prevent it from closing or opening correctly might be worth a look see.

The gaskets on the base of the carb and reed valve block have been known to leak too. Usually the rule was to always replace the gasket if you pull the carb off. It is a easy air leak to get and a easy fix too.



< Message edited by earlwb -- 12/7/2012 8:45 PM >

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RE: New SV Gassers - 12/7/2012 11:12 PM   
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Status: offline 		Thanks Earl,
The Sv's that I have came with WT 694s (chokes) on them. They have an external pulse line going to crankcase. On one the brass insert in the crankcase was completely stopped up with black crud, right outta the box, took a drill to get it out. I resealed everything with RTV, carb gasket, reed blocks, plate on side, etc. Took reed s out & checked them, laid on flat glass to make sure sealing, Last resort, rubuild carbs with complete kits, new diaphrams, needle, spring, removed lil freeze plugs & cleaned hi & low jets. After overhaulin carbs they ran for a while, 20 minutes, one good tank, then back to same ol problem. Have to screw out on hi side 3 + turns to get to run, low side about 2, turns, plugs (have tried 'em all NGK, Champion, Autolite & 3 heat ranges) show rich. BUT they won't run when you try to lean down. 
Have dual filters, chain saw filter for one clunk, Big metal for other, Sullivan Crap Trap on main line, carb screen is clean. Compression is good. 
Reset the timing, tried 28 to 30 degrees BTDC, used degree wheel, & timing device. 

It's got to be the carbs, something ain't right. That's why I'm looking for a REAL Walbro substitute. Some say the Wt 817 or 741 may work That's what's comes on the newer ones. I have tried a brand new geniune Walbro WT 433, had to substitute pulse cover from WT 694, it wouldn'r run it!! 
That's why I'm at the end of my rope!!  Help, Please! ANyone???
I have a good mind to box 'em up &  send to Capt M Com!! or BP Hobbies, if they'll even work on them!!



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RE: New SV Gassers - 12/8/2012 3:58 AM   
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Status: online 		I would think that the WT-433 should have worked out well. If it ran for 20 minutes good and then went all flaky. man that sure sounds like bad fuel, crud in the fuel or something like that. What fuel and oil are you using? I am running the high end synthetic oil from Amsoil, their Saber Pro oil. If you used a low grade mineral oil it could foul the plug out on you. Bad gasoline could do it too. Some of the Chinese cheapie spark plugs do not seem to last very long at all too.

Another thought is the CDI module is overheating. it works until it heats up. Also all of my CDI units so far are rated for 6.0v maximum voltage. A 5 cell Nicad or NMH pack exceeds that and can cause the ignition unit to fail.

I almost forgot that sometimes the little hall effect sensor can go bad to.it may be heat sensitive. I think they have some little test gizmos for it as well as a tester for the CDI too.

A SV 17cc engine I got used had a WT-694 carb on it. That has a 12.7mm venturi in it. When I ran the engine I could not lean it out at all. It stayed extra rich the entire time I ran the engine with it. But I had thought that the 17cc engine needed something around 9mm for a venturi size to work right. So I rummaged through my little collection of carbs and found a WT-520 carb (no choke, but it uses a external primer bulb). So I tried out the carb and the engine ran great with it. So since the engine ran so well then, I put it on a Escapade .60 plane and I have been flying it a lot like that now.

Now my RCV  26cc engine looks quite a lot like a SV 26cc engine too. It has a Chinese clone HiLo carb on it. Hobby king does sell the carbs too.
But you can do like I do and research Walbro carbs with this link here and find a carb with a venturi size of interest and options you want too.
http://wem.walbro.com/walbro/group2.asp?FamilyName=WT


You can see here where the 17cc engine uses a external tube to route the crankcase pulses to the carb's pump cover.



Here is how I took care of the external primer bulb for the engine too.



My RCG 26cc engine looks like a SV 26cc engine. But it uses a Chinese Hilo carb clone of a Walbro.
You can just see how they routed the external pump tube from the engine to the carb's pump cover in this pic here.
They crimped off the external primer bulb line on this carb.






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RE: New SV Gassers - 12/8/2012 4:09 AM   
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Status: offline 		Neat test stand! Thanks for the info, I suspected the danged carbs all along!!

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RE: New SV Gassers - 12/8/2012 4:47 AM   
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Status: online 		Now I have had problems with the diaphragms on the carbs of all of my engines. I have replaced the pump diaphragm with the teflon one. But the black one on the regulator seems to get soft and stretch out after a while, thus it doesn't regulate the fuel anymore. On the NGH engines, they use a soft aluminum pivot arm for the fuel inlet valve and I have had to bend it back up or replace it with a Walbro arm.  Usually when the engine suddenly starts to flood out on me, that means the fuel inlet valve has a tiny piece of debris in it, or the pivot arm got bent, or the diaphragm on the regulator stretched out too much on it. I would have thought the diaphragm stretching out would not cause it to flood, But it does. Go figure.

I suspect that there are a lot of fake or counterfiet Walbro rebuild kits out there. That tends to obfuscate the issue too. As the diaphragms may be substandard.




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RE: New SV Gassers - 1/9/2013 5:56 PM   
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Status: offline 		It has been five years to the first post, and the thread is almost dead now - but I am pretty sure there are a few of these SV engines still surviving. I want to add my experience for posterity's sake.
My first SV was a 26, exceptionally smooth and easy to start engine, not a powerhouse, almost the same power as a DLE-20 - but very reliable - I flew it for over 200 flights on a small fun fly before selling it with the plane. I bought another 26 on ebay, which was identically performing - flew that one for about 50 flights, then the plane crashed - the engine was sold separately later.
I bought a SV-52 twin on ebay, it was a repair project as someone had stripped the plug threads - repaired and flew it on a 85 inch extra for 80 or so flights. Absolute joy to run, first flip starts, never quit and about the same power as a 45cc RCGF engine - Sounds very good at idle and upto 4000 rpm. That engine was later replaced by a single in the airplane, and so it now resides in my display cabinet. It will surely fly many more flights.
I bought a SV-100 version 2 (or 3, as it has DL style cylinders) on ebay last year - It spins a Menz 27-10 at 6100, very smooth, very easy to start, and trouble free thus far - not many flights on it yet, so I will comment on reliability later. It pulls around a World models 36%, 29.5 lb (13.4Kg) Katana with ease, and has plenty of pullout from a steady hover. It has almost the same pull as my 3W-85CS.
video here

https://www.youtube.com/watch?v=Qu2Qi3fKDZ4

All my engines were originally sold by Khurri model engine works in Germany. I never had a single issue with any of these engines, so I would say the engines are more than ok for the price. The only engine I will not recommend is the 17cc single, which is disappointingly underpowered. They are reasonably well constructed, are certainly beefy and thus sturdy, heavier than DLEs and certainly have lower than average power for their size - but they make up for all that in price and ease of operation.
Where would I rate them - well DLE has marched so far ahead of the competition of Chinese engines, I think SV engines would only be a niche engine for the money concious - they are good reliable long-lasting engines, but they can not compete with the newer Chinese brands - (hell, even 3w and DA is having trouble keeping up with these new Chinese brands)
That is my experience with these queer little engines from China

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RE: New SV Gassers - 1/9/2013 8:04 PM   
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Status: online 		Well, I think it might depend on the use for a SV-17cc engine as to whether it is a underpowered engine or not. If a user wanted it for 3D or something like that, it would be underpowered. But if you are flying more conventional planes, it has decent power. I have a SV-17cc engine on a Great Planes Escapade .60 RC plane, and the engine works really well on it.  But when you research it some, the 20cc gas engines tend to weigh about the same as the 15cc and 17cc gas engines, and develop more power of course. So going with a 20cc for a .60 size plane is likely the better way to go. Thus it is hard to reccomend any of the 17cc or 15cc engines but instead point the way to one of the 20cc engines instead.
I do like the NGH 17cc engine though. With its front mounted carb, it makes it nice for dropping into a airplane setup for glow engines. It also seems to be more powerful than one might think too. I put it on a huge World SuperStunts .60 plane and it has power to spare.




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