DAVE KEPHART

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I WANT TO GO GAS ON A NEW GOLDBERG YAK 54 ,25 C.C. SHOULD DO THE JOB.WHAT IS THE BEST ALL AROUND ENGINE,STARTING POWER, WEIGHT ,COST IS NOT IMPORTANT.

Solstice

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Hi Dave,

I have just been running the Evolution 26GT. I have it with the full pipe. It starts and runs great. It's very new but power with the pipe is pretty darn good, over 8k on an 18-6 mezjlik. I'm expecting a bit of a jump in power after the first gallon or two. I have it on a 15lb Great planes Stearman. It will be going on floats and will gain another 2+ pounds. It pulls the plane well. Sorta like a OS 1.6 but not quite as stout. With the pipe it is very quiet. It's weight is not as great a problem as I thought it would be. The Stearman needed weight in the nose anyway.

Let me know what other info you would like. Great small motor, but do use the pipe or it falls off in power.

Jay

Solstice

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Hi Dave,

A bit more info for you. 18x6 Mezjlik is too small. I recorded 8650 ground and 9200 in the air. An 18x8 would be a better choice. Maybe even a 19x7 is such thing exists. Engine starts easy and runs very well. Pipe is very quiet, adds a lot of power. I suggest you set the needles as recommended. Mine was perfect from the start with the stock setting. The breakin at 30-1 mix worked perfectly, 40-1 after the first gallon. More oil than most seem to suggest, but it works very well.

Jay

LN-JET

I have one of the first series MVVS 1.60 gas engines (same as evolution)
It is 4 yearss old and keeps getting better.
I use the original full length pipe, and it turns the APC 18x8 at 8300rpm.
The 18x8W could maybe be a better choice.
The pipe is a must on this engine (or any Czech engine?) and it is not peaky, but has relatively linear throttling.
I have heard good reports of the JMB canisters also.

Regards

Lars

rmh

Jay- If you are running the 18x8 Mejzlic on factory pipe - the transition may suffer - having run a variety of prop/pipe combos on this engine - and reviewing with the Horizon engine specialist -we agree that the 18x6 --a prop which allow close to 9000 static -is best setup for max power and best transition
I flew my 260 H9 Extra at 11.25 lbs with pipe and Mejzlic 18x8 - very quiet , good power but not smooth as desired making it from low to max power - no matter how well I matched the needle setting to the combo.
The 18x6 stopped all this problem
letting the engine run to 10,000 is not a problem
You must have the mixture correct of course which means a bit fat on the ground .
The Skorepa 18x8 is the best 18x8 match to this engine we have seen. it runs up a few hundred higher than the Mejzlic. Also - his pipe is same power but far more quiet. (carbon fibre) This setup just yanks my 9.5 lb Funtana around like a rag doll.

DAVE KEPHART

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THANKS GUYS FOR ALL THE INFO,I BOUGHT THE EVEOLUTION 26 AND ITS A LITTLE WEAK COMPARED TO MY YS 1.40 ,BUT ITS NEW.
I'LL SPEND MORE TIME WITH IT LATER ,BUT NOW I'M PLAYING WITYH MY DA 150 POWERED COMP.330

rmh

The piped Evolution will eat that 1.40 alive -we have setup lots of YS 1.40s great engines - but not as much power.
We would get 10,000 out of our modified YS 1.40-s --on high pitched 14" props but they were not happy on 18" stuff

mnrcaerobat

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Where can I find a good pipe setup for the evo 26?

Solstice

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I would go with the stock Evolution pipe and header. 18x6 Mezjlik is the prop of choice. Not a peaky combo at all. Strong performer. I haven't tried a Skorepa prop. Dick Hansen seems to really like them. I think he said 18x8 for this type of prop. Heh Dick where do we get Skorepa props?

You might also take a look at MVVS offerings. They likely would be nearly optimal. Good luck.