RE: SPE 40cc
 

Well, I used the same gaskets for the new carb that was on the old carb. Must be blocking the pump hole some how. I can’t wait to get home and tear it apart to check. The suspense is killing me. I have the GP Extra 300S and am lacking just a little power for hover. This plane weighs a ton. I am going to replacing the ignition once I get the money. She ran great with the stock carb, but I am always looking for more power. I am also getting a MA 20x8 Scimitar wood prop and a carbon fiber landing gear and wing tube for less weight. Every ounce counts. I am currently running a 3W 19X8. I will post what happens tonight after I check it out. Thanks again.

P.S. Pic shows old carb and prop before maiden flight

RE: SPE 40cc
 

Hi Gapple12, did you break the engine lugs on your engine by accident or on purpose andthen install the aluminum mounting plate directly to the engine with the spacers bolted to the new aluminum plate??

RE: SPE 40cc
 

That is a good question I would like to know the answer to that too as I have the same engine.

RE: SPE 40cc
 

Well Gapple12 this is funny! I have exactly the same plane as you do and will put the same engine on the plane as you do (Great planes Extra 300s, and the SPE 40). So far I have an MDS2.18 in it, but the fuel consumptions is horrendous that is why I want to go gas. The MDS puts out about 21 lbs of static thrust with unlimited vertical but I would not mind an extra lb or so. So far I have about 20 lb with the SPE so I am trying to get some more out of it. Once I do I will put it on. Hey I have a question! How is the wing loading on the 300S with the SPE 40. Does the plane fly heavy or not?

RE: SPE 40cc
 

Well, I had the engine in a Yak 54 prior to this plane. Had a bad crash on the maiden flight and broke the engine mounts. I found the mount plate at Brillelli.com which worked out fine. I was able to use the stock lugs and the plate bolted right to the block. Seems to be much stronger this way. I love this plane with the SPE. It weighed in at about 13.5Lbs. I do not have much vertical, but pulls her around really well. She will hover about full throttle or a little less, so I need a little more power. I started with the WT540 carb and will next be buying the better ignition. I am also buying the carbon fiber landing gear and wing tube to drop a little more weight. These planes were built way to heavy how ever long ago it was. I didn’t research enough when I bought it since I love to fly 3D. I can fly her about 13 minutes on a full tank with a little left over. I bet that MDS 2.18 is a gas guzzler. I have High torque Futaba servos for controls and a hitec for throttle up front. I bought some 4.8 2500 volt batteries on ebay that only weigh about 4oz each and are right behind the wing for the correct CG. Currently I am running the 3W 19X8 on Castrol TTS full synthetic and 93 octane. I just switched to that oil at about 40:1, was Craftsman standard two stroke at 32:1. I plan on moving up to the 20X8. Hope this helps......

RE: SPE 40cc
 

Ok, got home and checked the carb. Sure enough the gasket was turned around and blocking the hole. Bolted it back up and wouldn’t you know it, I stripped out a thread on the block. So after I cooled down, I took the double lock washers I was using off and bolted it on with one. Fired right up and tuned in pretty well. Still doesn’t sound right to me so I will be buying a tack this weekend. Throttle response is super fast, but holding it at full throttle, the RPM's seem to slightly change every so often. I will run some more gas threw it this weekend at the field in the air. Didn’t have much time to run it more tonight, but has a lot more power, wow. This is my first gasser so I am a little new to these. Thanks again Pianori for your help.

RE: SPE 40cc
 

This is what the plastic intermediate connector looks like. The pump hole is not lining up with the opening on the plastic piece that is why you are getting non consistent rpm at high throttle. Look at the picture so that you can see how I have modified the rail so that it can match with the whole at the carburetor. [img][/img]

RE: SPE 40cc
 

Great, I will cut the slot tonight. Thanks again Pianori.

RE: SPE 40cc
 

Hey Gapple12 I uploaded another video of the SPE 40 setup running with a mejzlik 20 X 8 and a different muffler (just for kicks). I show some tach numbers while running. If you have time click on the link below. Let me know how yours turns out.

[link]http://www.rcuvideos.com/view_video.php?viewkey=a64333a59674678fb283&page=1 &viewtype=&category=mr[/link]

RE: SPE 40cc
 

Zippi,
As far as tuning I have not done anything special other than follow the typical low and high end tuning procedure. Typically I first tune the high end for max rpm. Then I start to reduce throttle at about mid range I hold it and hear for any gargle or popping. If there is some popping or gargle I close the low end about 1/8 turn at a time while the engine is running. Once it runs fine at that level I keep on reducing the throttle to a quarter and repeat the process. Once around idle (whatever it can hold as far as lowest rpm) I start to tweak the low end again so that I do not head any popping or gargle. Once I have a steady low end then I go back to the high end and retune for max rpm again and back of a tad (about an 1/8 of a turn). Then go back on the low end and check the rpm hold. Now I check for transition from low to high. I let the engine idle for about 10 seconds and then advance the throttle instantaneously. If the engine is tuned in right it should advance without hesitation. If it lags then I open the low end about an 1/8th at a time until it advances rapidly without hesitation.

Next step is to give the engine full throttle and let it run for 5~7 seconds at max rpm. Then cut the throttle rapidly to idle. If the engine is set up correctly it should reduce rpm and start idling without any effort. A sign of incorrect tuning would be when the engine would quit from the rapid deceleration or initially gargle a bit before the idle reaches steady state. If the engine runs erratically from high to low rpm before it settles to a steady idle it means that the low needle is too lean. Open it up 1/8 at a time and repeat the high to low rpm test. That is what I do in general when I tune and engine.

On the other hand, I changed the carburetor and ignition so that makes a diferenec too. The engine runs ten times better now. You can read the information at the thread that I pointed you to. I have so far about 1.5 gallons of fuel though it. I have run synthetic about 35/1 for the first gallon and now I am running 48/1 synthetic. It works for me if you have any other questions let me know.

RE: SPE 40cc
 

Where did you get the carb from and is this for the SPE40 or 26?

Thanks
Just ordered a SPE40 with thier Extra!
;)

RE: SPE 40cc
 

This is a previous post of mine answering a similar question of another member. I got mine on eBay.


There is also another carburetor (not the WT 540) for this engine at:
http://www.brillelli.com/brillelli_004.htm
for $14. The diameter is smaller than the WT 540 but it should be ok for you to get an rpm gain.

You can reed a review for the WT 540 at:
http://tech.flygsw.org/g26anatomy2.htm

For parts for SPE40 look at http://www.himodel.com/engines/spare_parts_2156.html

You can download a good manual for the SPE40 at:
http://www.himodel.com/en/info/manua...0CC_manual.pdf

This is the Walbro site with a list of all the carburetors:
http://wem.walbro.com/walbro/group2.asp?FamilyName=WT

You can get a good ignition for $80 at:
http://www.copperheadaviation.com/
He does not have them listed but he has them.
Another place to get the ignition is at:
http://www.bcmaengines.com/BCMAProducts.htm

You can always spend more money and get a CH but the ignitions that I’ mentioning they are excellent and have a very good reliable track record.

I hope this helps you
Take care,
Eric

edited by moderator for ebay item link

RE: SPE 40cc
 

Where did you get the SPE 40 and the EXTRA from? Just curious.

RE: SPE 40cc
 

SPE 40 was my design but bad idea about the leg. too long and week, that's cost lot of break, so I change the design and upgrade this one to 42CC, now it's become MT-42 engine , hope this one have less problem

RE: SPE 40cc
 

Bought from PeakModel.com both plane and engine for $519.00US delivered to Australia.

Its my first gasser but hope to get help from a friend at my local club (and here) who it switched on, but I am interesed in guys who have this setup and any thing they can add will help when time to build and maiden comes along.

I know there are parts being quoted left and right around here but not sure if I should just wait, get the engine mount it to a test stand and take it from there, or do I REALLY need to change the carb, CDI etc.??

RE: SPE 40cc
 

Tommyfly

You designed this engine??

What leg are you talking about?

and if you really are the main guy who designed it, what do I need to change, watch out for or replace before I start it up for the first time???

RE: SPE 40cc
 

yes, the SPE engine was my design , see the name. SPE ,mean Shen Ping Engine , it's happend my Chinese name is Shen Ping . in that time I was try to do design this engine at same way mount like DA, I never thought this engine are too much power and viabration , and the leg will broken finally. since my ex-partner get the right to produce and sell it. I have to make new engine ,now it's come out new enging , the MT-42 enging, and the new design have no problem with leg broken any more , and I upgrade this engine to 42CC engine, so the new replacement engine are light than SPE 40 and more powerfull .

RE: SPE 40cc
 

Well thats bad news, I just bought the engine!!![X(] [&o]

You havent told me whats a leg?? You mean the engine mounts and why is this engine so bad?

So have I just wasted my hard earned money on junk?

Sorry but from what you are saying is the SPE40 is not good.

OK since youre a engineer/engine designer I need your help. What do I need to fix on this engine?

RE: SPE 40cc
 

Hey Painori feel free to jump in with any comments.;)

I noticed the carb you mentioned has ben upgraded.

RE: SPE 40cc
 

$289,95 from Tom, Thomas Denney
E-mail Address(es):
[email protected]

RE: SPE 40cc
 

[quote]ORIGINAL: RoysterDW



Tommyfly


If this MT-42 is a good engine where can we buy one?

RE: SPE 40cc
 

It depends what you want. Stock the SPE produced abut 68~6900 rpm with a 20X8 prop which give you about 17 lbs of static thrust. After my modifications I got about 7450 rpm with the same prop for a total of 20 lbs of thrust. As fat as the ignition that it comes with it is not a bad ignition yet it does not allow the engine to perform at its best. When I used the ignition that came with it I got several mid range popping sounds. So the engine did not run as smooth. When I changed to the Rcxel ignition the engine ran smoother with better transition and power. If this is your first gas engine then I would recommend you try it as it is from the factory it will be just fine. Just make sure that you set it up right. After you get the basics of how to operate and tune a gasoline engine perhaps then you can upgrade some of the parts and that is if you are not happy with the flying performance of your model.

RE: SPE 40cc
 

Hey RoysterDW there is no need to panic the engine has been around for 3 years and it has been a reliable engine. What Tomyrcmodels is saying is that he found a way to make it better. As far as the leg that he is referring to he means the mounting bracket on the casing on the engine. The mounts are strong enough to hold the engine so you do not have to worry about it braking. I have been testing and flying the engine for some time now. However, if you crash your plane in a nose dive the mounting brackets most likely will brake. Most people are used to have a few crashes and be able to take the engine out and put it on another plane and fly it. Well, as you probably already know this is not the case with full scale aircraft (of course they are more complex). If a full scale airplane crashes you can bet that you will have to overall the engine (if it can be saved). We as modelers have been spoiled by enjoying products that are simple to manufacture and operate that can also withstand a pretty good beating.

In case the SPE engine mounts brake, there are after market back plates that bolt on the casing of the engine allowing you to re-mount your engine back to the model.
As far as power goes, the engine it is what it is, not bad for the money you pay. If you want to get more out of it then make the modifications and you will enjoy more power out of it. Tomyrcmodels is saying that after three years he came up with an engine that addressed some of the imperfections of the engine. Just like any manufacturer that tries to improve its product. Have you seen what the prices are for a DA 50, a ZDC or a 3W engine? They cost at least double the price of this engine at similar displacement (the DA is 10 cc larger), (it is understood that these engines perform much better than the SPE stock) but you get the idea. So overall for the price you pay this is a pretty sweet engine that will give you reliable operation for some years to come. Every time I fly my SPE engine at the field people approach me and ask me what kind of engine is the one I am using? Of course mine is modified, nonetheless people are curious to find out about it. Once you get hooked on gasoline you will rarely go back to glow power. So there is no need to panic. If you have any other questions just ask me.
Take care

RE: SPE 40cc
 

Pianori many thanks for taking the time to explain things to me.[sm=thumbup.gif]

Yes its our first gasser and its quite obvious by my tone of concern that I panic about nothing[sm=spinnyeyes.gif]
Any help you can offer would be greatly appreciated.

Ok I'll wait till it all gets here next week and we'll take it one step at a time. But being someone who likes to get the best out of something I'll probably upgrade the carb and CDI, but as you said I'll try it stock first. I am an intermediate pilot just getting into 3D and working towards my gold wings at our club but still have a long way to go before I get them.

Now, what gear do I need to get this bird in the air? eg. servos, switches, fuel lines.

I am considering: Futaba S3305 HT Metal Gear servos with Dubro Servo Arms Super Strength Futaba J Long, JR 589 for throttle, Zinger Pro 18x10 prop, Dubro Large-Scale Fuel Valve, Great Planes Gas Engine Ignition Kill Switch, Great Planes Velocity Stack 25-41.

I can PM you if wish but thought I would share all this with the rest of the world ;)

RE: SPE 40cc
 

RoysterDW it all looks good. I would consider some hitec servos as you get more for your money as well as more rotational speed. I would consider the HS625MG, it has about 6 oz less torque than the futaba but is about $10 less expensive and it is a lot faster than the futaba. The futaba you described has about 0.20/deg versus the hitec has 0.13/deg. You can choose any other servo with around 100in/oz of torque, but I would choose a faster one than 0.20/deg as you will find later on that the response time is not quite what you would like it to be. That makes a bid difference in the response up in the air. As far as the prop I use a 20x8 on that engine for my flying, but that is something that you are going to make a decision based on your style of flying. Make sure that you break in the engine with an 18X8 as you do not want to put to much load on the engine until the rings sit in properly. Run the engine for about a gallon with an 18x8 and then go up in pitch. That is what I did with mine.
Take care.