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RE: Diesel 4 strokes - 1/7/2007 4:44:17 PM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		Andy sorry to hear you are sick. We missed you in the etherless thread. Is that Tanaka a four stroke? I had someone ask about a Stihl four stroke to diesel converion. I've never really seen what they look like, but it was slpit at the case making conversion tough. it probably wouldn't fit in my lathe well anyhow.

The largest I've gone is .91.

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Greg

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       Post #: 126

RE: Diesel 4 strokes - 1/9/2007 2:14:46 AM   
AndyW


 

Posts: 1919
Joined: 1/17/2003
From: Timmins, ON, CANADA
Status: offline
quote:

ORIGINAL: capin

Andy, when I did the homelite 25 cc it worked really good but you will need to make a better ring or get one from Frank Bowman. Its funny because after 3 tanks of fuel it seemed to get alot better " breaking in". I just did it for fun there real cheap but I cut the grass at the airfield a couple times with it . Makes some funny noises when it started like a big tigre but when it warmed up it was one of the most smooth and content conversions I've ever done If you go back or search for homelite you'll find it here the post was 05/09/2006 dated. enjoy, Brian


Brian,

On THIS thread, can't find a 5/09/06 post but in any case, congrats on doing something original. I don't ever recall anyone ever doing a gasser to diesel. I commend that inspiration on your part but wait, you say you used this diesel to CUT GRASS ?? Geez, what a waste of a wonderful idea.

Well OK, that lets me be the first to fly a diesel/gasser conversion. But if you beat me to it,, that's OK too. Let us know how ya made out if you do. Myself, I still have to build a biggee and make skis for it. BUT, the way the non winter is going, around here, I may not have to by the time the plane is finished. Neat.

About rings, the Tanaka has two rings if that's what you mean. Otherwise, I'm new to gassers, how do I get Bowman rings?

< Message edited by 1705493-AndyW -- 1/9/2007 2:19:07 AM >

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Andy Woitowicz

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       Post #: 127

RE: Diesel 4 strokes - 1/9/2007 1:06:56 PM   
capin


 

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Joined: 1/19/2002
From: ellicott city, MD, USA
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RE: homelite 25cc diesel conversion? - 5/10/2006 7:36:40 AM


capin








Posts: 81
Joined: 1/18/2002
From: ellicott city, MD, USA
Status: online Yes, I did one a long time ago - you need to close the ring gap up alot. It was harder to start but it ran well once warm, needed a smaller carb- for which I made a insert . I cut the grass at the airfield many times with it , The guys thought it was the neatest thing going.If I recall I was swinging some real big string and when you floored it the thing would twist your arm off. I wish there were more guys trying to make this stuff work because its alot of work but very rewarding when done. There was also a guy who did a mac 28cc where I got the idea. The post was started on 5/28/04 check back in these forums. Brian

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< Message edited by capin -- 5/10/2006 8:09:20 AM >

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RE: homelite 25cc diesel conversion? - 5/10/2006 8:07:54 AM


capin








Posts: 81
Joined: 1/18/2002
From: ellicott city, MD, USA
Status: online Ralph, you need to remove the cylinder and lathe the top off . I epoxyed the 2 fins below and put nuts under to hold the head on like regular heads are held on. If I remember I made 2 heads for my 160fx os and 2 for my 3000 tiger one of which needed very little "cohersing" to make fit. Although its alot of work there are alot of problems here you have to make work- like ring gap for which Frank Bowman will make anything you want. The head to cylinder fit must be perfect and the fuel system is a whole new ballgame to. You really respect Bob Davis and others for giving so much hard work to make something work which shouldn't !! It was a fuel miser also. If I remember right the ring gap was closed up more then 5 thousandths- memory fading sucks-.When I first tried to start it the contra was almost touching the piston but it started but was weak- when I put the smaller ring in it that was a fix for one problem- next was flywheel effect which IT needed- I put larger string in and drilled 2 new holes for 2 more that helped alot it seemed expecially when trying to make something work which shouldn't. Then I could only open the carb half way and it would cut right off and I mean cut off! so I made a slug for the carb which helped but the new smaller carb did the trick. Finding the right timing was easy but it is on the bigger motors it seems. This was a well broken in motor to start with= I recommend you use a very good motor not a weak junker. After that I was going to do a echo but health went down the tubes and stopped me. Seems echo or stihl are great to start with also. The picture was when it still had the mag and all on it. When the mag and all the extra stuff was removed it became very light to ===a great plane motor=== alot of work but alot of fun- watch all your club members when they smell the diesel and see the smoke ! Brian

(in reply to capin)
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Andy, you can pm me if I can be of assistance. Brian

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       Post #: 128

RE: Diesel 4 strokes - 1/12/2007 4:53:44 AM   
AndyW


 

Posts: 1919
Joined: 1/17/2003
From: Timmins, ON, CANADA
Status: offline 		Hi Brian,

Many thanks, found your original posts. Yes, your experience with the conversion illustrates a few things that I've hoped to get with this project. TORQUE to swing major lumber and a smaller carb for better fuel economy. I'm taking off the original Walbro and will be installing a K&B Sportster .60 carb. Interesting thing is that the K&B's carb bore is only a shade smaller that the Walbro. I may find that even this, on diesel, is too large. In which case I've got a variety of .40 carbs to try. Neat.

You say the contra was nearly touching the piston. The piston is domed, I made my contra with a reverse dome. Was your contra piston flat?


This engine will be a test bed for diesel, gas ignition and glow/gas along with testing my own, homebrew Biodiesel. I have this crazy notion that, with the high lubricity of Biodiesel fuel, we may get away with not needing any additional oil in the mix. The Tanaka's or any other gasser, with it's needled rod should at least give us half a chance at making this work. We shall see, fun to try.

Appreciate your offer for help. Will take you up on that as we go along.

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       Post #: 129

RE: Diesel 4 strokes - 1/15/2007 4:18:29 AM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		Greg,

I'd love to hear how your OS 91 came out. Was it worth it? I want to do one if it worked well but if not I could sure save a nice engine.....

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       Post #: 130

RE: Diesel 4 strokes - 1/15/2007 10:48:35 PM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		Unfortunately I don't have much more to say about the FS-91 at this point in time. Not enough time over the holidays and now the weather is actually Chicago like, compared to last month. I think it will work out just fine, though.

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       Post #: 131

RE: Diesel 4 strokes - 1/16/2007 2:41:56 AM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		Did you make new push rod tubes or bore the recess deeper? Should I just cut the push rods and hand grind a new hemisphere on the end?

I should probably start with the little contra piston chamber. Cutting the 1/4 32 thread should be fun.....

I'm thinking about chucking up the head and starting to cut........

(in reply to gkamysz)
       Post #: 132

RE: Diesel 4 strokes - 1/16/2007 8:26:33 AM   
dieseldo


 

Posts: 2
Joined: 8/20/2006
From: brisbane, AUSTRALIA
Status: offline 		hi guys;
no need to shorten pushrods or make new tubes, i have just converted an OS48 surpass to diesel runs great. all i did was what you suggested for the tubes [bore the recess'es deeper ] and for the pusrods i shimed up the rocker post with some shim steel , worked fine. regards; dieseldo from downunder.
quote:

ORIGINAL: chevy43

Did you make new push rod tubes or bore the recess deeper? Should I just cut the push rods and hand grind a new hemisphere on the end?

I should probably start with the little contra piston chamber. Cutting the 1/4 32 thread should be fun.....

I'm thinking about chucking up the head and starting to cut........


(in reply to chevy43)
       Post #: 133

RE: Diesel 4 strokes - 1/16/2007 4:13:35 PM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		I shorten the pushrods and refinish the ends. I have shimmed the rocker assembly temporarliy. But usually there isn't enough room for the valve cover if you do that. Some engines don't have room for the pushrod tubes, so they need mods. I prefer to modify or make new tubes. My FS-30 needs new tubes.

Do yourself a favor and buy a 1/4-32 die. That's how I do it. When I get my CNC lathe running I'll cut the threads.

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RE: Diesel 4 strokes - 2/23/2007 2:14:24 PM   
ddd


 

Posts: 253
Joined: 9/28/2002
From: CT
Status: offline 		Your 4.5 hp is a typo. you are about .6 hp.

(in reply to MerlinL14)
       Post #: 135

RE: Diesel 4 strokes - 7/18/2007 7:12:12 PM   
Motorboy



Posts: 1715
Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline 		Hi Mike Cobb, we are moving to here since you are new here, welcome to RCU.

Sorry, i am not manufacture and sell "Lanova cell" concept.

It is not enough to mount the Lanova cell without the 4 stroke engine are reworked to a real diesel engine, also increase compression ratio in cylinderhead to example remove material from cylinderhead.

< Message edited by Motorboy -- 7/18/2007 10:04:06 PM >

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RE: Diesel 4 strokes - 7/19/2007 6:02:28 AM   
slackcat69ing


 

Posts: 2
Joined: 12/19/2006
From: Mandeville, LA, USA
Status: offline 		Jens,

Thanks for the welcome and replying to my message. My "experimental" diesel engine has been modified to raise the compression. A plug has been installed into the glow plug hole, but I want to be able to adjust the compression to experiment with different mixes of diesel fuel. Currently I am running a synthetic kerosene (not bio diesel or deep fry grease), but pure synthetic. Unfortunately, with the fixed compression ratio I am having to run a ignitor to the diesel. My objective is to be able to run 100% pure synthetic kerosene with about 2% synthetic lube oil.

Cheers,
Mike

(in reply to Motorboy)
       Post #: 137

RE: Diesel 4 strokes - 7/19/2007 6:45:39 AM   
Motorboy



Posts: 1715
Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline
quote:

ORIGINAL: slackcat69ing

Jens,

My objective is to be able to run 100% pure synthetic kerosene with about 2% synthetic lube oil.

Cheers,
Mike


The engine will not last with 2% oil, but which engine brand and size you are planning to run at 2% oil???


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Jens Eirik
All landings are just controlled crashes!

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       Post #: 138

RE: Diesel 4 strokes - 7/19/2007 7:45:08 AM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		What the heck is synthetic kerosene and why would you want to use it? I have to assume it is expensive stuff...

(in reply to Motorboy)
       Post #: 139

RE: Diesel 4 strokes - 7/19/2007 8:29:43 AM   
Motorboy



Posts: 1715
Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline
quote:

ORIGINAL: chevy43

What the heck is synthetic kerosene .......


Synthetic fuels — Synthetic kerosene can be made from coal, natural gas, or other hydrocarbon resources and can be produced by first turning the resource into gases, which are then recombined to form hydrocarbon liquids. Synthetic kerosene can be tailored to have similar properties to petroleum kerosene and can thus be thought of as a “drop-in” replacement. Synthetic kerosene from coal is presently used at one airport as a supplement to petroleum supplies and in the future this fuel will be approved as a total replacement to petroleum jet fuel.

To get more info, google more info..

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Jens Eirik
All landings are just controlled crashes!

(in reply to chevy43)