Hallo Leute. Ich brauche deine Hilfe. Unser Team denkt darüber nach, einen neuen 2-Zylinder-Motor zu bauen. es ist wassergekühlt. 12cc. unabhängiges Ventil.
aber hier sind zwei Probleme.
1. Wir sind uns nicht sicher, ob wir einen 2- oder 4-Takt-Motor herstellen. welches ist besser? Wenn es ein Zweitakter ist, machen wir 28 ccm daraus. Wenn es ein 4-Takter ist, machen wir daraus 12 ccm.
2. Der Zahnriemen ist in der Mitte des Motors angeordnet, um ihn kompakter zu machen. Wir machen uns aber auch Sorgen, ob der Riemen der hohen Temperatur standhält oder sich beim Starten des Motors abnutzt.
Was denken Sie? Irgendwelche Ideen werden viel mehr geschätzt. vielen Dank im Voraus. und senden Sie mir gerne eine E-Mail an service@stirlingkit.com
https://www.youtube.com/watch?v=Cz2mEyEHNQI
Hey there, well I dont know if you’re still working on this engine but if you are I think a Twin 2 stroke would be cool since there’s already a lot of 4 Stroke twins out there and also because it could be put in an rc snowmobile.
Hi,
i would never put the belt drive in the middle,
if there are any problems you have to dissmantle the whole thing,
also i woud expect tightening and temperature problems.
Why do not use a “uprjght shaft” valve control?
It is more expensive but would be something special.
Best regards,
Bert
1 . 4-stroke and 2-stroke model motors cannot be compared with each other, unless they are exhibits for beauty. If you need maximum power at fixed speeds – 2-stroke, if efficiency, good control and flat load characteristic, then 4-ton is better.
Considering that engines with different working volumes are planned twice, the question should be formulated as follows: these are two completely different motors and for different purposes – which one to design and build in the first place to satisfy the preferences of a larger number of consumers. I do not know the answer to this question, I am personally not interested in two-stroke engines :) they are primitive.
2. As for the timing belt or starter, I modernize the old ones and design my 4-ton engines and I have formed my own experience and opinion. metal chain drives have no advantage on small motors and only cause problems. Modern polymeric timing belts reinforced with aramid fiber or steel wire benefit from all aspects:
- efficiency. the essence of the chain transfer is the rotation of the axis of articulation of the links in the interdental space, which leads to friction, wear and heating. whereas the toothed belt works without friction (elastic deformation only)
- noise and vibration. make any explanations here.
- weight. a metal chain with the same transferable power will have a greater moment of inertia when the rpm changes and will limit the throttle response if this is not the case due to springs and valves.
- wear and tear. The toothed polymer belt does not lead to wear even when abrasives are injected. the metal chain must be kept clean.
- belts are available and cheap. what about the chain?
- I can continue listing :)
in my motors I rely ONLY on the BELT!
the chain is possible if a copy of a real plague is being built and this is an important detail of the purpose of the copy.
3. now about performance at high temperatures.
now belts are made from polyurethane and isoprene. Both of these materials work well at a temperature of -35 … + 85 degrees for an unlimited time under extra load. If the belt is not used for power transmission as in the timing or occasionally as in the starter, operation at 100-150 is possible. Do not forget that although the chain is metal, it needs lubrication – and it can become a bigger problem under the same conditions! When designing an engine, it is important to understand that if it is water-cooled, then the operating temperature will not exceed 100C (everywhere except for the exhaust system). If you get the temperature of the crankcase, crankshaft, cylinder block and head more than 100 – this is already an emergency! because the coolant will boil! You will get local overheating, jamming and destruction of anything but a belt!
I love the SYNCHROFLEX® GEN III AT3 and T2.5 belts and the MXL isoprene belts are very good and available. I have never had any problems with belts except that I can’t get rid of them :)
4. I would not make more than one carburetor per motor unless it is an injector. The smaller the carburetor, the worse and more unstable it works, this is a consequence of the laws of hydraulics and hydrodynamics. to this it must be added that the synchronization of the operating modes of two or more carburetors is a headache for the user. a single carburetor will also be cheaper and easier to manufacture.
all I said is my personal experience and my opinion. it is possible that in a particular situation these recommendations and conclusions will not be appropriate.
Forget timing belt use metal sprocket like in a Honda RC30 mortocycle
I say you should make both! Maybe you could manufacture half and half. I’m sure many people will want a 2 stroke, and many will want a 4 stroke. Personally, I’d prefer it to be 4 stroke. However I suggest you manufacture both.
I’d be interested in seeing this process play out. Thanks.
Make it 2 stroke. I think its time we start getting some actual usable performance from these engines. This can be the race version of the toyan L200 and NR200 we have already. I like the idea of putting the belt in the middle of the engine but it would impact the serviceability of the engine. Also if it can be a single carb that would be great!