Hello,
I have the Evolution 26GT - engine has about 2 gallons of fuel through it (40:1 mix), running APC 18x6W prop. Engine runs great, easy starts, good idle, transison, and it spins the APC prop at 8500..... but, - after every flight I have to wipe the bottom of the fuse - this thing is making just as big of a mess as the glow motors - am I still too rich? What am I doing wrong? I use the same fuel/oil mix in my DA-50 and it runs clean...... Any ideas?????????

(while not upset about it) I would like to know why too, my MVVS 35cc gasser has about 3.5 gallons threw it and it still spits a little black goo on my plane, but just a bit tho,, I have noticed that it will stop spitting this stuff and then if I lean the high needle a bit it will start spitting more black goo..

Jim

Huh. Since mine (Evo 26GT) is my first gasser, I thought that this was a normal occurrence. The unused/unburnt oil has to go somewhere though. Have you reduced your oil content yet, and what octane gas are you running? And Xman, you're telling me that you can spin an 18x6 APC at 8500? Mine will only spin a 17x6 Xoar @7850 tops. Tried different props and never saw revs that high. I'm right at 2 gallons too. Then again maybe its the 5" aluminum spinner (P-51).

Yes, my evo 26 spins 18x6W APC prop at 8500 rpm.... The first prop I had on it was a carbon fiber 18x6 Biela, and it would spin it at 7800.... after one gallon of fuel I replaced the prop with the APC one and with out making any other changes I gain 500 rpm.... after second gallon I leaned out the engine and I can get it to spin the APC prop at 8700, but that was just nuts, and I was afraid that it may be running too lean, so I richened the mixture a bit and it seems very "happy" now.... As far as "unburned" oil and mess is concerned, gasoline engines should run clean, with out making mess like their glow counterparts - all my other gas engines (DA 50R, ZDZ40) run clean - and keep in mind that I use the same fuel/oil mixture and oil brand in all my engines. I talked to Horizon about it - they had no idea what’s going on with the motor - the only thing they suggested is that I am mixing too much oil - I don't see how - 40:1, that is what they say in the manual.....

Go to 32-1 syn and say there -
there will be exhaust residue - accept it -wipe it down with a little fuel on a rag .
On the piped 26's they always spit residue as do all my gassers (I run 32-1 in all of em) .
On the 26-- it has smallish rod bearings -in that it is a compact case - these are what fit the job
The bearings can not afford to be run dry as larger ones can tolerate .
The factory says 32-1 fuel - stay with it .
( 4 ounces of Mobil 1 to 128 ozs of 91-93 oct.)

I have a Evo 26GT, it is my first gas engine and need some advise. I can only get 7900 with a prozinger 18X6 wood. The engine has 1 gallon of gas run through it, my needles are set at the factory setting as it says in the instructions. I just switched to Amzoil 100/1 but mixed it at about 80/1. I tried leaning it out today but the engine did not run as well so I returned the needles back to the previous settings. Am I missing something?

I run Red-Line synthetic racing oil mixed at 40:1 in all my gassers - i think this is the "after brake in" ratio they call for in the instructions for the evo 26 too - also, you might want to try different prop - I gain 500 rpm just by changing props....
What muffler are you using? - If it is Bisson muffler, cut off the ends of the down tubes - just enough to open up tubes to their full diameter. By the way, does your engine spits out a lot of oil, making a mess kind like glow engines?

Sounds like the revs that I'm getting with my 26GT (using Xoar 17x6 and 5" Dave Brown aluminum spinner). Tried a variety of different props and couldn't get any more RPM. I currently have another brand new one that I have yet to fire, and plan on checking revs against current setup. Also, I'm using Yamalube synthetic racing oil @40:1.

I am using the bisson muffler and will try trimming the ends. What about the needle settings? does it run pretty much as in the manual or have you guys tweeked them a bit. Also as I said previous I am using an 18X6 ProZinger wood prop. How about carbon fiber or Xoar props. Please give me any info anyone has.

try more oil first. If you want to stay with Amsoil, you place the engine at risk. There are so many excellent oils there for the 1:40 mix. Read my web pages and forum if you want to learn aboit oil and tuning the needles.

Ok.... first of all you want 40:1 not 1:40 mix.... I have had the best results with the APC 18x6W prop - It gives about 500 rpm more than any other prop I have tried (Mejzlik 18x6, Biela 18x6) As far as needles are concerned, I have leaned them out some, maybe between 1/8 to 1/4 of a turn... Right now my engine spins the APC prop at 8500 rpm and it sounds very happy - I tried leaning it out even more and have seen almost 8800 rpm, but there is no need for me the run that lean.... 8500 rpm is plenty to pull my GP Stearman around....[sm=tongue_smile.gif]

""Please give me any info anyone has"",,, IMO, get rid of that Zinger, get a good named prop like 3W, Menz, Bolly or anything just get rid of that Zinger..

carbon props,, you may get more RPMs you may not,, I have seen my friend get a increase of 690 RPMs on his old Sachs 4.2 with a Bolly carbon and he went larger diameter (same pitch), on the other hand I have read that other guys did not get an increase in RPMs while swapping to carbon (same size)..

Jim

Ok guys, I am going to cut the tips off the muffler and picking up a 18X6W APC prop today also will use 40to1 oil mix. One last question, regular or premium gas?

I run regular, 87..... if you want to run premium you will have to advance ignition timing and reset your carb settings.....

Only premium will do.
MVVS prescribes 95 octane (RON) or better. That's 91 pump octane in the US. There is no need for any timing adjustments.
If xman2000 wants to test his engine with regular 87 (PON), let him.

What you are missing is the deceptive means that Evolution sells its engines. This engine does not come near making 3.8 HP as is posted on the Horizon website. You can't turn a 18x8 prop because it does not make enough power to. I called Horizon before i bought mine and was told the stats were correct. After i could'nt get it to make any power, i called and they told me the stats were with a tuned pipe. Something they omitted from the first call. After waiting for the pipe on back order i finally get it. Put it together and the engine won't run. Seems to be a propblem with the electronic ignition. Mind you i don't have 2 hours runtime on this engine. I look up the ignition system on horizon site and $239.00 just for the ignition!!!!!! I only paid $399.00 for the whole engine.
This thing has been a POS from the beginning and i have been lied to and ripped off. I asked for a refund and guess what, they said NO!! I am now sending the POS to them to see how good the warranty is. The ignition on this engine has been changed 3 times in two years as per the Horizon website.

i am fixing to file a complaint with the Illinois State attorney General, Better business bureu, and any one else i can for deceptive business practices. Since they used the mail, i am also filing a complaint with the Postmaster General.

The engines I tested all would deliverway in excess of 9300 rpm on a 18x6 prop and the standard MVVS tuned header/pipe combination. That is very close to the max power that MVVS claims for the gas engine, and I am sure that with some adjusting of pipe and header length for best power at 9000 - 9500 rpm, their claim of 3.8 hp will be fulfilled.
MVVS is one of the few companies that do have a dyno test stand, and a dedicated person to operate the test equipment. They also are known to de-tune their engines somewhat (grudgingly) for a broader power range.
It seems that your engine is flawed one way or another, and this is an issue between you and horizon, not a general engine issue, and certainly not an issue on this thread which is about oil stains on the plane.

Mine is for sale, you interested? Since you think so highly of them maybe you will pay full retail?

I have been running my engine on 87 octane and it runs just fine... as far as timing adjustment, it will be necessary to advance it

edited by moderator for flaming

You can get a Chinese ignition from C&H for $80

I know what I am talking about. You soon will too.

, Some learn faster than others Pe

Such a pity of spent innocence.
ROFLMAO

Pe

I apoligise on behalf of all the normal people on this thread for the rudness you have encounterd.

Mike

Mike, you have all the makings of a true English Gentle Man.
It's not rudeness, just ignorance that I try to enlighten. You can't blame people for having short fuses. It's when you light that fuse, things start to happen too quickly.