liquid_TR

Well Im getting 7800 RPM on JXF/Xoar 17x10W prop and on mostly 3/4 to full throttle manuevers,

I fly for 10 minutes on a 10oz tank and still have a generous amount of reserve left in the tank. (maybe 3 minutes of gas)

2robinhood

Any up-dates?
Is the 1.60 still running?
Any performance gain/loss?
Any videos in the air?

From what I have read here the( and comparing it to my 1.60FX on glow ) the gasoline conversion seems to make less rpm then a glow version.
Mine on 10% glow fuel was turning a APC 18 X 6W @ 9,250 on the ground.

But your gasoline conversion turning a JFX 18 X 8 at your rpm numbers that is a very respectable.

I have done a ton of testing with the CRRC Pro GF26I gasoline engine.
I turn the same APC 18 X 6W from above @ 8050rpm and a Xoar 18 X 8 ( which is the same brand as the JFX that you used ) @ 7400 rpm.
You turned the JFX 18 X 8W ( Wide ) @ 8040 with a tuned pipe.
I turn the Xoar 18 X 8 @ 7400 with the CRRC pitts mufler.
So, you used a wide blade prop, but also a pipe.
We are talking roughly 600 -650rpm differance.
The CRRC is designed for gasoline from the start and can be bought for under $200.00
Is the coversion worth taking a $275.00 OS 1.60FX adding $$$ to do the conversion to get 650 rpm more? + what will the longevity be?

Please don't take this wrong, just wondering if all the conversion is worth it as far as $ for $ goes.
You have done a very good test and seems that you have a good running engine.

I know that CRRC has a new 26cc in the prototype stages and it seems to be a real screamer.
We'll have to see how it does after testing.
They are turning a Xoar 18 X 6 @ just over 8300 rpm.
It' not much of a video though.
http://www.youtube.com/watch?v=F7sAT...e=channel_page

PlaneKrazee

My Feedback: (14)

650 rpm is alarge difference in power. Is it worth the effort? It depends on what typeof planeit's in. A pattern plane I would say yes. In a plane that needs nose weight, no.

2robinhood

Believe me I understand the differance in 650 rpm.
What I am saying is:
CRRC 26cc gas engine ready to run is $200.00.

A OS Max 1.60FX ( $280.00 ), Ignition ( $90.00 ), Carb ( $60.00 ), adpters and gaskets ($40.00 ? ), header and pipe ( $150.00 ).
I am guessing at the add on prices, but that's $650.00 +.
Why spend that kind of money on an engine that is just above a $200.00 engine.
Pipe the CRRC and it might be real close and still be below 1/2 the price.
You could buy a engine designed for gasoline cheaper them what this conversion is.
Neat, yes................... cost effective, No.
Even the weight is more then most 26cc gasser on the market after you add all the parts needed.
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PlaneKrazee

My Feedback: (14)

2robinhood,

No one is going to use the gas engine you mentioned in a pattern plane do to lower power, too much vibration and weight.The OS conversion isworth it in the right application.

A YS engine is over $600.00 and uses a lot of 20% nitro fuel.

Can you see where there could be a use for the lightest, strongestgas engine?

2robinhood

So why not just keep it on glow fuel? Price of the fuel?
It seems it lost power/rpm being converted to gasoline, but did become more fuel efficent.
To have the same power as it did running on the glow fuel, would it need to be a bigger displacement?
Like a converted Moki 2.10 on gasoline would equal a OS 1.60FX on glow fuel?

My OS 1.60FX on glow fuelstomped what my 26cc gasser would ever do, but it drank more then twice the fuel.
So going by the rpm numbers in this thread I feel that the converted 1.60 is about equal to a 32 - 35 'ish gasser.

Is there that much of a vibration differance? Do they run exactly like on glow ( smooth ), but only using gasoline?

PlaneKrazee

My Feedback: (14)

The motor you posted in the video, is it for sale? It sure isn't the crrc selling now.

2robinhood

No it is a new one that is in the testing process now.

Here is a short video of my 26cc CRRC ( current one forsale ).

http://www.youtube.com/watch?v=8IQpg_DxpX4

liquid_TR

Hey guys,

When you come to think of it, it doesnt seem feasible to buy and convert a 160FX to gasoline. And I wouldnt  have done it if it wasnt going into a pattern practice plane. Dont think about the money you spend on conversion, as it amortise fairly quickly because you are burning free gasoline fuel..  If I were in US, I wouldnt even think about this conversion, because the glow fuel is so cheap.. Here, like the rest of Europe, Im paying 40-45USD for a gallon of 15% nitro byron, wildcat or Omega..

Im still running my conversions, and this one with the pipe is over 35liters of gas, 30 liter of it with a 20:1 oil-gas mix. 30 liters ofgasoline would equal to more than 60 liters of glow fuel. Roughly 60lt= 16 gallons. that would mean around 700 USD for glow fuel. and Ive spent around 100 USD for gas and oil.. thats 600 bucks in pocket

On the 160 FX the tuned pipe and header is adjusted so that, like a 4 stroke, the engine would have optimum rpm and huge torque over the rpm band. Instant transition. It easily rivals 140RX on pipe. and I can confirm here that 160FX on gasoline with long pipe; out perform a YS140 running on 20% nitro..

If you are not going to use a pipe on the engine, there is no point of making this conversion. If the engine is going in a sport plane or slow flyer there is no need. Even for 3D, I dont recommend it. I would buy a MLD 28cc and get the nearly same performance.  But If you fly your plane alot, with a tuned system, then it may turn out to be a real money saver.

tkg

My Feedback: (1)

If your going to be think about converting ANY glow engine to gas. Be realistic in you thoughts. The only reason to do it is for the reason TR spoke of $$$. That means that you have to fly it to recover the costs. If its a plane that you fly once a month then don't bother.

liquid_TR

exactly..

PlaneKrazee

My Feedback: (14)

When the new version of the crrc engine hits the market I would be interested in it. I wonder how close the timing on the new lighter updated version is to the 160fx.

2robinhood

Jody @ Valley veiw RC should have them in a week or two. He already has the tuned mufflers.
You can PM him on this site or e-mail him through the company website.
Tell him 2robinhood sent you.

2robinhood

From what I understand the New CRRC 26cc is smoother, lighter, and up some on power.

airborne2.4

The New CRRC 26cc also mounts like a glow!!!!!

rwijnhov

How is the 160fx? Still running. I am about to convert a brand new one.

Texastbird

I am about ready to try this on a used bgx 3500 I have acquired.

liquid_TR

Here is the older photos updated from original post:


The original flange:



I drilled out the original flange with a 15mm drill bit:







Then I cut away the remaining throat with a metal saw on the drill bit:



I cleaned up the remaining burr with a sanding paper dremel bit:






Now its time for the new 15mm throat.
I bought a piece of 15mm OD and 13mm ID stainless steel pipe.
The reason I chose steel was the tapping would be more durable than aluminum as its only 2mm at each end.



And the 17mm long steel throat gets into the carb flange throat nice and snug.





There is no easy way to bind aluminum to stainless steel,
so I mixed up a small amount of Devcon Steel epoxy (same as JB Weld) and applied to the joining surfaces.
A small amount is more than enough to hold them together and seal for any airleaks.





UPDATE: You can drill a hole thru oppsite side and put a setscrew to secure the throat after a fine application of JB weld.

liquid_TR

The engine is still running fine after 50-55 liters of 95 octane gasoline mixed with 5% (1:20) scooter oil (mineral) it still performs as the first day of conversion. all shiny and oily inside.

I find it safe to run 5% oil in this engine. no visible sign of wear, not even on the bearings after a respectable running time... I changed spark plug just once..

my only suggestion is to rig a venturi on the walbro carb to stop fuel spraying occasionally from air intake.

rwijnhov

Does your carb need presure from the crankcase? Or do you have a walbor that doesn't use a presure line for the diafraghm? could you pls post pictures of the eninge of both sides?

PlaneKrazee

My Feedback: (14)

Liquid TR,

How does the 160 rpm on gas compare to running glow?

rwijnhov

I am doing the same conversion. I will use the engine with a tuned pipe in a 3d plane. Total dry weight of the plane will be 5kg. So I hope this conversion wil be enough power for full 3d on this combination.

coronabob

My Feedback: (10)

Ralph/RC Ignition is converting mine. I plan to put it on an old Funtana 90 to replace a MVVS 160 gas, whose bearings went kaput. The OS 160 is a much higher quality engine in my opinion. I plan to use the MVVS tune pipe on the OS.

raubold

My Feedback: (156)

Hi Guys
Another successfully conversion on my older FX 160, since it needed bearings i replaced them with sealed bearings (no lube worrys)
Carb is DLE 30, adapter is from the Evolution 26 but i drilled the Crank case to the adapter size. Ignition is a RCEXL unit for that
minni Spark Plug, starting at 30 degrees BTDC, spins a Vess 18X8 at respectivly 8600 at 3650 ASL with 68 F temp outside
Starts nicely cold, bit lazy when hot. Chased about 1 quart mixed 16:1 thu it with no issues so far. Nice and quiet with the stock O.S
Muffler, might use it since i have it.
Engine goes back on an old Aeroworks profile with chopped wings.