Gas Conversion
 

I have just converted a Moki 1.80 glow to gas using electronic ignition. I have added an extra head gasket to reduce the compression and have adjusted the timing to get the engine to run smoothly. I found the Moki methanol carb to be a bit touchy on the needle so I now use a walbro. Engine is running on 97 octane petrol with 20% TCW outboard high quality two stroke oil added. Tickover is very good but at full throttle the engine will only peak when it is hot and the aircraft in a slight dive otherwise it tends to 'burble'. The engine at full throttle therefore would appear rich but if I close the high speed needle it will cut especially as it comes up to top revs on fast throttle up. Is this because the high oil ratio is reducing the octane ( power ) of the fuel mixture? If so is 20% being too cautious?

RE: Gas Conversion
 

20% oil is too much. Try some where around 16%. Also the higher octane gas you run the higher the compression needs to be so take off one of the head gaskets. Also use a oil for aircooled engines.

RE: Gas Conversion
 

In my tests (more than 6 months) with a chineese 140 glow engine i'm mixing 95 octane petrol with 6 % (six per cent) Motul 800 full shynt oil (esther type) with success. No wear on conrod. No wear on piston ring. For break-in i mix the oil in 10% (10:1) ratio. I have 3 engines of this manufacturer converted, two 140 and a 120 , same engine.
Start is a children play. Runs at full throttle without problem. And all of this with standard carb.

Easy start :
http://www.youtube.com/watch?v=1LwJdgpg4lg
Full throttle (8.600 rpm with 16x8 graupner prop) :
http://www.youtube.com/watch?v=xP9N0...eature=channel
Throttle Response:
http://www.youtube.com/watch?v=BTc71I9HO7o
Idle :
http://es.youtube.com/watch?v=a2CF3SFa_EU

More than 3 gallons of fuel oneach engine. I've tried XYZ and Rcexl CDI, CM-6 and 1/4*32 spark plugs. Many many hours .....

Regards

RE: Gas Conversion
 

I have never tun any two cycle engine (except my old motorcycle with mechanical/metered oil injection) on anything but a 20% mix. Chain saw, outboard motor, go-cart engine etc.

Bill

RE: Gas Conversion
 

20:1(5%) or 4:1(20%)?

RE: Gas Conversion
 

Of course i'm using six parts of oil on one hundred parts of mix. Sorry, but here in my country we talk about oil-gas mix this way. Percentage is not the same as proportion.
6 % is a little more oil than 20:1 (exactly 16.6:1).

Regards

RE: Gas Conversion
 

I thought TCW outboard oil was only for water cooled engines ?????????????

RE: Gas Conversion
 

Very good indeed! Does anyone know where to find Motul 800 full syntentic lube in USA. Thanks Capt,n

RE: Gas Conversion
 

Search the motorcycle shops. Motul is fairly popular in the US.

RE: Gas Conversion
 

<strike>http://www.starcycle.com/street/motul.html</strike> site no longer works!

800-990-BIKE or 661-248-1400
FAX 661-248-1405

20655 Soledad Cyn. Rd., Canyon Country, CA 91351-USA

$50 min order

RE: Gas Conversion
 

Guys...Thanks for the tip on where to get Motul 800 2 cycle oil. There are a few cycle shops around here in Michigan. Best Regards Capt,n

RE: Gas Conversion
 

I just checked Parts Unlimited, the Great Planes of motorcycle shop suppliers. They carry Motul 800, so virtually any shop should be able to order it for you. I'll be checking with my local shop tomorrow.

RE: Gas Conversion
 

I don't know whether Castrol oils are available in the States but I believe Castrol TTS two stroke racing oil is the same spec as Motul 800 Tony

RE: Gas Conversion
 

More information on Castrol TTS at http://www.castrol.com/liveassets/bp.../TTS_B1517.pdf.

Product Application
Castrol TTS provides excellent lubrication for most competition, street
and off-road motorcycles and is our prime recommendation whenever
a higher level of engine protection is required. It may also be used in
Go-Kart racing engines, or wherever Castrol Activ 2T is recommended.
Castrol TTS is particularly recommended for trail bike riding due to its
low exhaust smoke characteristics.
Note: Castrol TTS is not suitable for use with methanol (alcohol) base
fuels. Castrol M is recommended in these applications (see Product &
Technical Data Sheet B861/91/1).
Castrol TTS is soluble in “Kero-Ether” fuel blends used in many model
engines as long as no alcohol is added.
For highly stressed competition engines, Castrol R2 Racingbike is the
prime recommendation. For competition applications, particularly for
very high engine speeds (typically greater than 14,000 rpm), Castrol
A747 is the prime recommendation (see Product & Technical Data
Sheet B1109/95/1).

RE: Gas Conversion
 

How about Klotz 2 cycle oil, is it about the same as Motul 800? Capt,n Here is more data LUBRICANTS 2-STROKE
SYNTHETIC
ORIGINAL TECHNIPLATE®
Pure synthetic bases are blended for the perfect level of 2-stroke lubrication and
performance. Klotz Clean Burn technology virtually eliminates carbon and residue buildup.
Extreme film strength engineered to reduce engine component wear and build
horsepower. Blends with methanol alcohol and gasoline.
• TechniPlate Peak Film Strength and Anti-Scuff protection
• Extreme Load Carrying Capacity engineered to reduce engine wear
• Clean Burn ™ Technology reduces carbon and residue build-up
• Contains familiar Klotz Red for easy mixing and racy odor
APPLICATION:
Primary use is in alcohol and R/C Model glow fuels
R/C Modeling – 2/4-stroke glow
Motorcycle/ATV – 2-stroke/alcohol; Stock, Hi-performance
Kart/Micro Sprint – 2-stroke/alcohol; Stock, Hi-performance
Kart/Micro Sprint – 4-stroke/alcohol; Stock, Hi-performance, Road Racing
CHARACTERISTICS:
Smoke Rating: 10 1=fog; 10= no smoke
Clean Burn™: 10 1=heavy deposits; 10=no carbon
Film Strength: 7.5 1=failure; 10=virtually no wear
Viscosity @100°F: 950 SUS 50 W @ 40°C: 200 cSt
Pour Point: -15°F
Flash Point: 460°F
RPM Limit: 12-13,000; R/C Model 20,000+
Rust Prevention: Contain rust inhibitors. Not recommended as a
storage lubricant.
Certification: A.P.I. S.A. Intended for Racing Engines Only
Color: Red
DIRECTIONS:
Compatibility: Blends with BeNOL® castor oil, SuperTechniPlate®, gasoline, methanol alcohol,
nitromethane and stays in suspension. Will not blend with petroleum oils or synthetic lubricants.
100% Biodegradable formula.
Fuel Stability: Will dissolve in gasoline at ratios of 15:1 or greater; alcohol at ratios up to 5:1.
2-Stroke pre-mix: Do not use in oil injection systems.
Air cooled engines mix at 16:1 to 20:1
Water cooled engines mix at 20:1 to 32:1
R/C Model: 2-stroke glow engines mix at 15 -18%
Kart: Air cooled mix at 16:1 to 20:1
AVAILABILITY: KL-

RE: Gas Conversion
 

I don't think so.
Many shyntetic oils are made of poliglicol based with some additives (sorry) with less load resistance than esther (sorry again) based oils.
Motul 800 is a esther based fully shyntetic oil.
Regards

RE: Gas Conversion
 

Castrol TTS is not an ester based oil, it is also diluted with kerosene. Klotz Techniplate is not ester based. I've used KL-200 and I like it because of it's a high viscosity. I also have Klotz R-50 which seems very similar but has higher film strength, and is only for gasoline blending. Pe Reivers has a nice chart on his website. I have the same opinions about oils, though some simply aren't available in the US, and some of our oils aren't listed. http://www.mvvs.nl/MVVS/main_bestanden/petrol.htm#oils The best, and most expensive oils are the esters.

RE: Gas Conversion
 

Where can I find this Motul 800 in the USA? Thanks Capt,n

RE: Gas Conversion
 

Perhaps your rich condition is caused by the walbro carb. I have a corsair with a homey 45cc conversion, that does the same thing (goes rich in the air). I've just finished tapping the plate over the metering side of carb and plumbing a line to dead air. Will find out Mon. if it works. Good luck, red

RE: Gas Conversion
 

This is a standard fix for going rich in the air.
It really helps with transition also.
The new tube from the metering plate goes inside the Fuse.

Good Luck