Thread Tools
Old Jul 17, 2008, 12:25 PM
joenavy120885 is offline
Find More Posts by joenavy120885
Newbie
Discussion

Nitro-to-gas conversion


what would i need to convert a nitro engine to a gas burner (besides spark plugs and an ignition system)?
Sign up now
to remove ads between posts
Old Jul 17, 2008, 03:32 PM
ivanc is offline
Find More Posts by ivanc
S.A.D. member
ivanc's Avatar
A needle bearing for the big (bottom) conrod end is a must. Preferably for the top end too.

A gas carb.

Ivan
Old Jul 17, 2008, 04:29 PM
Wayne V is offline
Find More Posts by Wayne V
Registered User
Wayne V's Avatar
What size engine are you planning on converting ?
Old Jul 17, 2008, 07:05 PM
Arceenut is offline
Find More Posts by Arceenut
Registered User
Arceenut's Avatar
You would also need fuel tubing and stopper on the fuel tank that was compatible with gasoline. The silicone tubing and type of stopper used on the tank will swell and become useless in very short order when in contact with gasoline or any petroleum based fuel.
Old Jul 17, 2008, 08:13 PM
usna71 is offline
Find More Posts by usna71
Suspended Account
You don't need a needle bearing rod. Just make sure you use an adequate amount of oil in your fuel. Glow fuel works well. My OS 300 Twin was converted to ignition and the only mods was the ignition system itself. I run it on standard glow fuel with castor@20%. The rods are stock and it has at least 100 hours on it. None of the old pre-war ignition gasoline engines had a rods with needle bearings and they worked quite well. Ohlsson made zillions of them and zillions are still operating. I have the Harris conversion but there are several other good ones. You may have to change the needle size but usually small engine carbs work satisfactorily.
Old Jul 17, 2008, 08:15 PM
GunnyGlow is offline
Find More Posts by GunnyGlow
piro-maniac........
GunnyGlow's Avatar
Quote:
Originally Posted by usna71
You don't need a needle bearing rod. Just make sure you use an adequate amount of oil in your fuel. Glow fuel works well. My OS 300 Twin was converted to ignition and the only mods was the ignition system itself. I run it on standard glow fuel with castor@20%. The rods are stock and it has at least 100 hours on it. None of the old pre-war ignition gasoline engines had a rods with needle bearings and they worked quite well. Ohlsson made zillions of them and zillions are still operating. I have the Harris conversion but there are several other good ones. You may have to change the needle size but usually small engine carbs work satisfactorily.
You converted it and still run on glow fuel?? I'm confused.......
Old Jul 17, 2008, 09:06 PM
gkamysz is offline
Find More Posts by gkamysz
Dieselized User
gkamysz's Avatar
An ignition engine can be run on many fuels. Regular glow fuel is one. I run my Enya 46-4C on methanol. I've run it on E85 and I will be trying other fuels.

Gasoline can be run in these engines however you can't run the common 50:1 oil ratio people think of. Some have have been using 16:1 with good results. Four strokes are much better in this regard. The oil isn't constantly being washed out of the engine so a lower oil ratio is acceptable.

Greg
Old Jul 17, 2008, 09:06 PM
usna71 is offline
Find More Posts by usna71
Suspended Account
It's converted to ignition. That means it uses a spark plug, not a glow plug. I also have an old Ohlsson 60 that I run on glow fuel. It uses a 3 to 1 methanol to castor oil fuel. That's 25% oil and 75% methanol. They will also run quite well on Coleman lantern fuel which is naptha, the same thing as lighter fluid. Just because something is an ignition engine and uses spark plugs doesn't mean it has to run on gasoline.

The old pre-war 2 cycles ran on a mixture of 2 parts white gasoline and one part 70 wt motor oil. That's 33% oil.
Old Jul 17, 2008, 09:08 PM
GunnyGlow is offline
Find More Posts by GunnyGlow
piro-maniac........
GunnyGlow's Avatar
Ok....I guess I didn't think about the ingredients in Glow being flammable....I was just thinking of the catalytic reaction.

Thanks gkamysz and usna71 for clearing that up!!
Old Jul 17, 2008, 09:41 PM
usna71 is offline
Find More Posts by usna71
Suspended Account
But of course
Old Jul 17, 2008, 11:04 PM
joenavy120885 is offline
Find More Posts by joenavy120885
Newbie
i don't have any particular engine that i'm going to modify yet but it will be a 4-stroke, possibly the O.S. IL-300 if i can afford it.
Last edited by joenavy120885; Jul 17, 2008 at 11:18 PM.
Old Jul 18, 2008, 02:15 AM
usna71 is offline
Find More Posts by usna71
Suspended Account
If you can afford the engine you can afford the conversion. That engine was really designed more as a collector piece than an engine to be used in an airplane.

It cost me about $200 to have my 300 Twin converted to ignition. An inline 4 will be a bunch more. The twin fires both plugs every up stroke but you can't do that with the 4 cylinder so timing it becomes a serious consideration.
Old Jul 18, 2008, 08:48 AM
joenavy120885 is offline
Find More Posts by joenavy120885
Newbie
the distributor and timing is easy, i just have to figure out the coil and power source
Old Jul 18, 2008, 11:08 AM
Connexxion is offline
Find More Posts by Connexxion
Nemo in a blender
Connexxion's Avatar
And what about mixing some gas with methanol.Do you still have to modify the carb and fuellines?
I want to modify a FS40 to ignition and recall someone mentioned the possibility to mix some gas with the methanol to improve fuel efficiency.

I don't know what ratio to mix the gas with the methanol and assume the oil content has to be the same as if it was running on straight methanol.
Old Jul 18, 2008, 12:18 PM
Wayne V is offline
Find More Posts by Wayne V
Registered User
Wayne V's Avatar
On my GAS/GLOW weedeater conversion i run 1/3 10%nitro/10%oil mixed with 2/3 gasoline and use an OS F 4 stroke glow plug, no ignition, since the weedeater has needle bearings on the con rod the oil in the glow fuel ends up coming out to 3% when mixed with the gas which is plenty, i would suggest keeping the oil ratio the same as usual on a glow engine or even a little more since the engine will run hotter on a gas/glow mix, standard tygon fuel tubing works fine for gas/glow.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
60 size gas conversion Q????? misskimo Electric Heli Talk 33 May 08, 2005 03:00 AM
NITRO Vs. GAS MrTracy Racing Boats - Internal Combustion 1 Apr 16, 2004 06:39 PM
Nitro Burning X250 Conversion costath Fuel Plane Talk 11 Apr 26, 2002 12:44 PM
Electric to gas conversion?? Paul Penney Electric Plane Talk 15 Dec 19, 2001 06:22 PM
K & A L-39 Gas conversion gwb Electric Ducted Fan Jet Talk 0 Oct 17, 2001 10:08 PM