@ minh than
i wnt even try to uswe ether, i want it to run without, allthough i have a lot ether athome and some model aero compression engines, i dont want to get into the ether discussion now...kerosene or nothing ! thats my goal. it must be a true diesel , not a compression ether engine ,....
This issue I talked about before, you did't read or skim through....thanks for that info! i think i did exact that mistake that i forced tomuch out of the pump...,
Hi pirmin kogleck !
If your engine has a low compression ratio and uses ether in the fuel and gives early injection time or gives early injection time with high compression ratio- about 45 degrees before TDC seems fine.
because if the O-rings are worn, the pump will still create enough oil pressure to inject into the cylinder at the compression stroke 45, 40, 35, 30 degrees before TDC, because at that time the pressure in the engine cylinder is still low. Or you can also combine the above suggestions with brass cylinders
Edit : Injection time: More precisely the time the lobe begins to contact the pump piston: 22 to 45 degrees before TDC
it is just my goal to make it run as a Diesel !
in model Airplane /rc plane hobby there are so called diesels, and i think the topic was already discussed here . i just would like to have it run as a diesel like Mr. Hansen did . i used the terminology true model diesel or worlds smallest refering to model engine because when u look for just diesel injecotr or model diesel u get many other videos not related to the engine type we try to build, this is why i used this terminology ( "worlds smallest" and "true Diesel") i think it was also Mr. hansen wich used the Word "true Diesel" because if u search for model diesel , then youtube redirects you to the Rc airplane engines, wich i also do like, i have many of those Model Diesel rc engines , very small some under 0.2ccm ) those rely on the ether , but since we try to copy rudolph diesels system or more i should say the injector after Prosper Lòrange and the self ignition from diesel, i like to use True Diesel to not mix it up with rc model diesel engines...
thanks for your thoughts...it is indeed very tricky and like i mentioned in one of my private messages Find Hansen said himself it is almost impossible to lap a such small Plunger in our Home Workshops with out machines . he said itr woill work for a short time and then it get lweaks, many times he had tried and failed and also many many people before and after him tried this and had little succes....i also believe that u are 100% right that the pump i have built has the pressure i need and it wokrs fine, it is just the thing that i want too have it sealed so the engine does not drip fuel on the wood plate and everything looks fine...i am sometimes very very picky and if something doesnt work i cant go to bed without fixing itOne more thing I want to tell : I have never lapping pistons with cylinders if it has small diameter . Because the steel or stainless steel for the plunger with small in diameter ( < 3 mm ) it will bend and get stuck in the cylinder ... if it has a little difficulty moving in the cylinder . Even with the rod tool (a hard steel 3 mm , 2.5 mm, 2 mm ..) you can break it with tight tolerances
With large diameter cylinder - I have lapping piston with cylinder ?? Yes yes , only with a cylinder diameter of 16 mm . But only once or twice. And I don't like it. All - a lot of the cylinders I make for me and some friends (from 6 to 22 mm) including engines and cylinders, I always do my way: make the cylinders fit the pistons or back and I never lapping
I only rotate ,move back and forth the piston in the cylinder with oil a few turns , If the plunger actually moves through the entire cylinder with the oil but there is still a little - very little - not smooth
At this step you really have to be careful, the cylinder, plunger and oil must be really clean, a little mistake will ruin all your efforts and time.
If someone advises me: lapping plunger with cylinder has < 3mm diameter with tight tolerances. With my experience I very much doubt that
So be careful with any advice lapping pistons with cylinders if it has small diameter and with tight tolerances
. he said itr woill work for a short time and then it get lweaks, many times he had tried and failed and also many many people before and after him tried this and had little succes....i also believe that u are 100% right that the pump i have built has the pressure i need and it wokrs fine, it is just the thing that i want too have it sealed so the engine does not drip fuel on the wood plate and everything looks fine...i am sometimes very very picky and if something doesnt work i cant go to bed without fixing it
..i am sometimes very very picky and if something doesnt work i cant go to bed without fixing it
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