ajcoholic

My Feedback: (10)

Those pictures are much better at explaining... THANKS!

AJC

Motorboy

Thanks!! I has taken these photos today in evening (Norwegian time).
Jens Eirik

AMB

Bottom line Jens (IT WORKS)(YOURS) ....Looking at the drawings of the german diesel (2 Strk)
the same set up would work on 4 stroke if you could run the pump off the cam ( making a
new one and a housing would be a challenge or a 1 to 2 gear off the shaft to a second cam just my thoughts
you guys are the machinists and the crankcase would hold lube oil??
I am intriqued by the injector mini pintle and spray nozzle??I wonder if any of these engines still exist
model museum maybe ,looks like you and AJ are setting some new standards in the engine
game martin

Motorboy

Hi all folks, i has runned in my Magnum 52 4 stroke and leaned fuel, it ran nice and fast enough. Drink not much fuel. Has not tachometer to measure rpm. I used 12x6 propeller. Vibration are not much difference from methanol powered 4 stroke engines. After i had runned engine i checked inside of cylinderhead. there are complete combustion and much soot inside. More better photos of metalwork and after running in engine. Between cylinderhead and piston are at 1 mm, calculated from compresion ratio + extra volume from "energy cell" with contra piston. Compresion ratio are between 18:1-25:1.

Jens Eirik

joe78586

My Feedback: (3)

WOW 4 stroke diesel![X(]
How doese it sound(how about a video of it). And can you post some close up picks of the contrapistoncylinder?

fiery

My Feedback: (2)

This is so cool.

Jens

I have an OS 52 sitting in it's box after hundred's of flights because I am bored with it and have moved on to 1/4 scale aircraft. I would LOVE to do a conversion.

You have a business opportunity here if you have the time. Any chance of offering a conversion service?

AMB

Not a bad idea have a brand new mag 52 sitting on the shelf that would
love to "go under the knife" (transplant surgery to diesel)

Motorboy

To Joe78586, sorry, i has not video of it with sound[]..
Here are near photo of contra piston and "energy cell".[8D]
I has maked a better design of "energy cell" than early with 2 screws as shown in other photos of Magnum 52.

Jens Eirik

joe78586

My Feedback: (3)

OK I think a don't have the proper tools to make one. [:@]
How much would you charge me to make me one for an OS .26S-C car engine? It should be the same since all engine sizes use the same glowplugs right.

thanks for the pics

Motorboy

Impossible, you must replace whole cylinderhead to increase compresion ratio with a cylinderhead maked for dieselfuel, it has contra piston inside.
My 4 stroke engine cylinder head has smaller volume after i removed material with lathe and mounted "energy cell" in cylinder head.

Jens Eirik

Hobbsy

My Feedback: (102)

Moto, I think the OS .26 Joe refers to is a fourstroke.

joe78586

My Feedback: (3)

Yes the .26 I am referring to is a four stroke. And I can remove the head gasket and if needed I can shave the sleeve to get more compression.
This is the engine
http://www2.towerhobbies.com/cgi-bin...?&I=LXPT58&P=0

Hobbsy

My Feedback: (102)

Joe, when I tried to run Diesel fuel in my Saito .80 as is, it had far too much compression and I couldn't run it more than half throttle. In fact at half throttle it was making dangerous noises.

Motorboy

Hi, first i thinked it was a 2 stroke carengine [X(], yes..it is possible to convert your engine to dieselengine. You must remove material from cylinderhead and a part of crankcase for sleeve. It shall be about 20:1-22:1 compression ratio + volume of "energy cell", it shall be variable between 16:1-20:1 with contrapiston from low to max. It is not enough remove head casket to increase compresion. But you must have head casket to seal better..

Since your engine are a car engine, maybe you must add a bigger flywheel to run better in idle..

Cause too high compresion where it detonates very hard in engine, better you mount the "energy cell" as shown in photo and reduce compresion. Have you measured compresion ratio at your Saito?

Jens Eirik

Hobbsy

My Feedback: (102)

It is 14.4 to 1

Motorboy

Hobbsy.. It is not much... Can be cause of form in cylinderhead to develop detonates. Every 4 stroke engine has not same form in cylinder head.. and fuel formula to example try reduce ether 25-30%, without m.e.k.peroxide, oil same as before 20%. If it run well, try add 1 % m.e.k.peroxide, run engine well, try 1% extra.. until engine detonates, then go back to same mixture there engine ran well.
In big engine need less ether/mekp than small engine. Saito .80 are big engine than my engine at Magnum .52.
Try difference sizes of propeller until detonating are removed..

Jens Eirik

capin

My Feedback: (11)

Well, I've just got my old asp 80 4 stroke running on DAVIS fuel. It took some doing ,milling the head and cylinder both but only really needed to mill the head. The lanova cell worked great , made as per Motorboy's picture's. Motorboy is your's steel or aluminum, broke my Aluminum one off in the head- will repair this week. Swing's a 14-6 master airscrew pretty good. Noticed it changed the valve geometry some. All in all it's pretty neat, My buddy is bringing his camera over to post some pic's later

Motorboy

Very well done!!!
I used steel when i maked the lanova cell. My engine works well without problem with material. I used locktite in glowplughole before i screwed the lanova cell at cylinderhead. Before i used spring to hold contrapiston screw, replaced with a nut, it hold better.

I ran my engine long time and drink not much fuel.[8D]

Jens Eirik

capin

My Feedback: (11)

Ran for over 1 hour on 14 ounce's about 3/4 throttle- funny though it really sounded like a diesel when accelerating- not like the 2 strokes I've done, even my os 160 isn't this cool!!!! Brian

AMB

Impressive looks like both of you have closed the gap on making 4 strolke diesels. Now if Saito
or Magnum would do a factory issue this would take care of the "non gifted" among us

Motorboy

Hi Dieseldan..
I will not recommend Saito engine , when i am thinking about diesel. Cause the valves and combustion camber designs are difference from these engines i has converted. Saito has Hemi/pent-roof comb. camber. Not engines with Wedge comb. camber to example Laser engines.
Better Bath-tub or Discoid comb. camber. And valves in line with piston/sleeve are better, angled valves in cylinderhead make it difficult to convert to diesel.

Jens Eirik

donkey doctor

Hello; Has no one considered the "external combustion chamber" just like the Wright brothers used on their first plane engine. A compressible chamber screwed into the glo plug port. The compression might have to be raised to accomodate the added volume. If the Wrights could do it in 1903 we should be able to do it in 2004.

Another comment on Diesels; I spend 10 hours a day behind a Cummins KTA 600 engine. it has a very narrow power band, only 500 rpm's actually, however it'll keep trying down to about 1400 rpm. If I was designing an aircraft engine I would want one that would be able to give power over a wide rev range. I guess what I mean is, what abot diesels is better for an airplane engine?

Motorboy

"external combustion chamber", it is difference from Lanova combustion camber.

"external combustion chamber" using the blowlamp to warm up and get glow at tupe where are screwed outside at cylinder head. It is old ignition method as we use now in our glowplug engine warmed up with electric instead blowlamp.

Lanova combustion camber make better torbulence and mixing fuel/air and warm up rapidly than in cylinderhead and igniting fuel/air mixture, then blow out of camber and burn up all fuel/air mixture in cylinder.

Germans has used dieselengines in their airplanes... See in webside: http://www.billzilla.org/ideas4.htm http://www.zoche.de/ http://www.wilksch.com/ http://www.enginehistory.org/Diesels/CH1.pdf

Jens Eirik

Hobbsy

My Feedback: (102)

I think a Saito engine would work great with your device, the Saitos very effecient combustion chamber would make the Diesel conversion work very well. The Saitos thrive on high nitro better than most other fourstrokes.

capin

My Feedback: (11)

iT FLY'S!!! IT HAS A 12-11 APC- VERY FUEL EFFICENT, OLD BETSY LOOK'S ROUGH BUT RUN PRETTY GOOD. WILL TEST MORE NEXT WEEK