Need a little help or maybe a lot not sure right now. I took my Lanier Yak 30% uptoday on a madien and six minutes into the flight motor died on me. I had to dead stick it for the landing. NOT FUN! Anyone have experience with the EVO 58? Anyone want to take a crack at this? The engine hasn't been run in about a year. It's a little older modle running on the 4.8v ignition. So gas is about a year old too. I checked the fuel lines the looked fine, not hard or cracked, no bubbles in the fuel line. It draws fuel just fine. I prime it with choke on four about 5 cranks on 3rd attempt with choke on and ignition on it starts right up. Transitions fine from idel to wide open throttle just fine. Running a TBM 24x10 wooden 2 blade prop and getting about 5300RPM.

Also what kind of mix should I be using 30 to 1 or 40 to 1? I can either get 91 octane or 93? Is there a big diffrence? A local gas station also has 103 racing gas? Should I just stick to the EVO mix or is there something better and cheaper?

is this an EVO 58 or evolution 58?

I thought they were one in the same it's an Evolution 58cc.

Did it have a miss in it before it died, if it did, that would indicate ignition battery being weak. I use sub c packs on all my 4.8v ignitions. Pull the plug and inspect it, if it is too rich or lean you will know from the condition of the plug, then go from there.

I coudlnt tell it was pretty far out when it cut out on me and there were a few other planes in the sky and couldnt really hear much. When I pull the plug what should I look for how can I tell if it's running to rich or too lean? I also put a volt meeter to my battery back on the other side of the switch and it reads 5.21 that's after the flight and about 10 minutes of playing with the carb settings etc.. It's a 1400mAmp Ni-Mh.


Thanks for all the help guys I really appreciate it.

Thats an easy one to start with, your battery is way to small. A 4.8v battery only has 4 cells, compared to 5-6 on 6v or 7.2 that means less actual capacity do to less cells. On my evolution 4.8v ignitions I run sub-c 3800mah packs which are close to an AA 2500mah 7.2v pack in actual power capacity. A 4.8 volt ignition has a higher currant draw do to the lower voltage.

if you have a dark brown almost carmel colored spark plug you are probably to rich, but I would start with the ignition battery.

Here are a couple of pictures of the spark plug. Anyone know what the gap should be and it looks like one side is dark and the other side is white? Also what do I need to do with the ignition battery. I checked it out and it after the flight it's reading 5.21 volts. Are you saying I should just go ahead and replace it? I also have a little volt meeter hooked up to it with a little switch that says 4.8 and 6v it's set to 4.8 and it reads fine as well. Is the recomendation to replace the battery? The battery I belive is 2 years old.

I would cycle the battery and get some fresh fuel mixed up. Year old gas is nothing but trouble.

Discharge the battery at .25 amps, 250mah and see how long it stays above 4.8v. 2 years on a nimh battery is quite while if it hasn't been cycled in a long period. The plug doesn't look that bad, if anything maybe a touch lean, but not bad at all.

Kurt,
Not sure but I run a seprate battery for the ignition the ignition battery is 1400mah. I've got 2 2000mah in parallel that run the servo's / reciver. Just a noob first big plane so not sure if this is right or not.

Here is the laundry list of things to do.

1) Replace ignition battery. Can you guys tell me if this is a suitable battery? 4.8v 1500 Ni-MH?
http://www.horizonhobby.com/Products...rodID=JSP91030

2) Replace all fuel lines with medium grade "gas" fuel lines inside the tank and out about 4ft or so.

3) get new gas 91octane minimum 93would be even better(Costco) use 40to1 Evo 2stroke gas mix.

4) clean carb with carb cleaner take out one needle at a time and clean.

5) Replace spark plug.

?? Anything else I need to try?

I would put at least a 2500mah pack on the ignition, I run a 3300 or 3800mah sub c batteries on a 4.8v ignition, its worth the extra 4 ounces. You can never have too much battery capacity, but for damn sure can't have enough! I buy them at all battery.com, they have lower priced and fresher batteries then most hobby outlets do, I've learned that through experience! You can get a 4.8v 3300mah sub c for under $20 on their website. Leave the needles in the carb alone and DON'T change the setting, if anything get a minor carb rebuild kit from a lawn care repair or supply, because if the carb set for a year the pump diaphram has probably got hard and may fail in a short time. Just take the carb, engine or plane with you so they can see the walbro carb to match the kit up for it. It is simple to do, other than blowing the screen off, it is just replacing gaskets. Have the mower repair guys rebuild it if needed.

Some body a little mixed up here.A 4.8 volt pack will have less currant drain and run longer then a 6 volt pack of equal size cells.I run 4.8 volt double AAs 1800 MA. Have a couple of gassers using 4.8 volt Triple AAAs.1100MA.I no very little about ignitions.
No remarks Grumpy.
Grumpy no two.

Word

bcchi, You are very confused, lower voltage means higher current draw, Have you ever heard of ohm's law??? Volts x amps equal watts! 4.8volts x .2amps=.96 watts....9.6volts x .1amps=.96watts. Very simple, you might want to check it out and NOT spread mis-information to the newbies!! Which you are guilty of!!!

Here the product bulletin from horizon:

Evolution Engines GT2 and GX2 Ignition Battery Requirement
Recent tests have shown that the new Evolution Engines GT2 and GX2 ignition systems require a minimum of 6.4 volts for proper operation. Subsequently, it is necessary to use either a 6-cell, 7.2-volt Ni-Cd/Ni-MH battery or a 2-cell, 7.4-volt Li-Po (lithium-polymer) battery as the power source for these ignitions. Capacity ratings of 1200mAh are sufficient for a day’s flying time.

I have this engine for 3 years now and I have a 7.4volt 1500mah for the ignition

Please - please recheck your figures and don't guess at the current draw. For the same load resistance higher voltage always equals higher current draw. The man you are bad mouthing builds ignitions.

If anyone is spreading mis-information it is you.
John

Norton,
You have 4 batteries on a 4.8volt pack, RIGHT??? You have 6 on 7.2 volt pack, RIGHT??? That gives you 2 extra batteries on the 7.2v pack, RIGHT??? So then a 7.2 volt 2,500 mah pack has 40% more (actual) capacity then a 4.8v 2,500mah pack, RIGHT??? Check out ohms law!!! The higher the voltage the lower the current draw, FACT!!! The only way a higher input voltage ignition could have the same current is if it had a hotter, stronger spark! I don't know what the actual output voltage is between a 4.8v and a 7.4volt evolution ignitions are. If 7.4 volt ignition has (let's say)a 20,000 volt output and a 4.8 volt has a 10,000-15,000 volt output, then you could be right, but that I do not know.

With all due respect to the posters, there are several Ohm's law equations, but one of the basic ones is I=V/R, where I=current, V=voltage and R=resistance. So, for a given resistance, a lower voltage results in less current. Another equation is that P=IV, where P=power, I=current and V=voltage. Thus, for a given current, a lower voltage results in less power. Can't change the laws of physics.

Since the original poster already has a battery, it might make sense to determine it's health by cycling it. Also, is the volt meter a loaded meter? If not, then it's not giving as much useful information as a loaded meter would provide.

One final observation is that the prop seems large for that engine. I think a 24x10 on a 58cc is putting a lot of load on the engine, with max rpms at 5300. Do you have a smaller prop, say a 22x10?

-Ed B.

I went ahead and ordered a JR 2700mah 4.8v battery with my laudry list of other items. A couple people have said to replace the ignition battery so that's what I'm going to do. The manual says a minimum of 600mah for 1.5hr's of flying. 1400mah seems like overkill, 2700mah seems a bit over the top. Personally I will never fly more than an 1.5hours on any one plane in one day. I always bring 2 or 3 planes Gas, Nitro and electric to keep it slightly diffrent. I do have a volt meeter and a decent Turnigy Acucel 6 charger but neither can test the load so with out being able to test the condition of the battery I'm just going to buy a new one for $30 and be done with it.

Question: Will a 2700map battery provide a stronger spark for the ignition than my current 1400map or is it just going to provide a spark for a longer amount of time. I don't need a long answer but I'm just confused as to why I need a battery with such a large capacity. I've provided the manual to the engine I have below maybe I needed to be more specific sorry if I mislead anyone into thinking I have the new GX2 version.
MANUAL:[link=http://www.horizonhobby.com/ProdInfo/Files/EVO_45_58_manual.pdf]Manual for EVO 58GX[/link]http://www.horizonhobby.com/ProdInfo/Files/EVO_45_58_manual.pdf
pg 8 about the battery


The manual says I will take up to a 26x10 2 blade so I dont think it's over propped. 24x10 should be the sweet spot for that motor based on what others have "posted" I have not yet confirmed this for my self.

Guys, I just wanted to point out that I have the OLDER 58GX Evolution not the new 58GX2 which your reffering too above. Mine runs on 4.8 not 6v.

The load doesn't change. The voltage to it does. You do the math. I=E/R. Having been an electrical engineer for the last 30 years I do not feel the need.

Battery capacity does not have anything to do with battery draw.

OK!

No more explanations of current draw relative to voltage!

Any more may get removed

Moderator

Sorry. I sent Kurt a PM.
John

Like I said I, no very little about ignitions,have only built around 23000 of them.I think I have heard of ohms law.What you say may be true about Evo ignitions. Maybe this is why we replace so many of them. Your ohms law does not work in this case.On my ignition and most of the Chinese ignitions The RCEXL for example a c lone of mine. On average will draw 400MA at 8000 RPM,4.8 volts ,500 MA at 8000RPM 6 volts,600MA 8000RPM.7.4 volts.Go figure.I just went and checked 10 new CHRCEXL ignitions..This was average on all of them,not all exactly the same but close.
I'm sorry about bad information,I'm just a dumb farm boy who got lucky and built a ignition that worked about 30 years ago.I will make no more comments about this as I do not no what I am talking about. Maybe we are talking apples and oranges,who nos.
I do no this ,do not use 7.4 volts on the RCEXL ignitions .The new ones should be OK on two A-123s.The RCEXL is used on over 26 Chinese engines,I guess when they decided to build a ignition they copied the best one they could find. The C&H.
O-boy .Im gone I have said too much already.Im really sorry. Ohm,s law I did hear of that once but a long time ago .I forgot .besides I am old I can always use that if nothing else works.
BCCHI