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Designing own engine.
Hi!
I've been designing a 4-cylinder 2-stroke motor that would be relatively easy to machine. If anyone here has SolidWorks 2007 and knows something about motors could you have a look and tell me that will it run if i make one? What needs to be altered? Is there actually any chance making one that runs? Solidworks 2007: http://user.personal.fi/atk/Lahha/Engine.rar eDrawings: http://user.personal.fi/atk/Lahha/Edrawings_engine.rar All the part names are in finnish but i don't think that i'll be a problem. |
RE: Designing own engine.
I can't open the .rar files. Do you have separate Edrawings files?
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RE: Designing own engine.
.rar files can be opened with WinRAR: http://www.rarlab.com/download.htm
Unpacked eDrwings files: http://user.personal.fi/atk/Lahha/edraw/ |
RE: Designing own engine.
It looks like piston port induction. Why is the slot for the connecting rod so small, why not the same as the cylinder bore? I think the basic idea is feasible. Did you check port timing and areas? Also crank journal sizes. Connecting rod will probably need a cap at the big end. Could you make the crankcase in two pieces instead of three?
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RE: Designing own engine.
ORIGINAL: gkamysz Why is the slot for the connecting rod so small, why not the same as the cylinder bore? ORIGINAL: gkamysz Did you check port timing and areas? Also crank journal sizes. ORIGINAL: gkamysz Could you make the crankcase in two pieces instead of three? |
RE: Designing own engine.
I don't mean to rain on your party, but why not use one currently available? The available modern engines will run much better than anything you could make because of the precision machining and decades of experience from previous tried and tested designs.
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RE: Designing own engine.
ORIGINAL: Nathan King I don't mean to rain on your party, but why not use one currently available? The available modern engines will run much better than anything you could make because of the precision machining and decades of experience from previous tried and tested designs. Mayde later i'll make one that actually can be used in some RC model. |
RE: Designing own engine.
Designing the transferports and timing are much difficult and you can spend much time to try and fail until the engine will works well.
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RE: Designing own engine.
ORIGINAL: Nathan King I don't mean to rain on your party, but why not use one currently available? The available modern engines will run much better than anything you could make because of the precision machining and decades of experience from previous tried and tested designs. Those guys who like to design and build their own planes would probably understand. The guys who like em' RTF probably will not :) Not that there's anything wrong with that. I have built dozens of engine in the past 10 or 12 years and it still gets my adreniline flowing like nothing else to bring a new engine to life. Amazing feeling, worth the many hours of work. AJC |
RE: Designing own engine.
ORIGINAL: ajcoholic ORIGINAL: Nathan King I don't mean to rain on your party, but why not use one currently available? The available modern engines will run much better than anything you could make because of the precision machining and decades of experience from previous tried and tested designs. Those guys who like to design and build their own planes would probably understand. The guys who like em' RTF probably will not :) Not that there's anything wrong with that. I have built dozens of engine in the past 10 or 12 years and it still gets my adreniline flowing like nothing else to bring a new engine to life. Amazing feeling, worth the many hours of work. AJC We're "tinkerers"! ;) |
RE: Designing own engine.
Here's what I would do. Find an engine that is similar in bore, stroke, and RPM to what you want to build. "Borrow" porting from it. Any sport RC glow engine will work, for instance an OS LA series.
I didn't look at the size of this engine, what is the displacement? If you don't know about this site, take a look. www.modelenginenews.org |
RE: Designing own engine.
Exactly what GK said. What would be wrong with taking the porting/timing of a current successful engine, and applying it to your own?
"Men of Steal" have long dominated the scene. Good luck with your project, and won't you have a grin on your face when that baby fires off for the first time. You can't win if you don't play. Go for it! |
RE: Designing own engine.
ORIGINAL: gkamysz I didn't look at the size of this engine, what is the displacement? Bore: 25.00mm Stroke: 30.00mm You think Team Infinity .18 RTR would be any help? It's the only engine i have atm. E: My friend has some .40 airplane engine. |
RE: Designing own engine.
ORIGINAL: Lahha It's 60cc. Bore: 25.00mm Stroke: 30.00mm The bore and the stroke you had quoted calculate to 14.73 cc, or roughly 15 cc; not 60 cc. From the long stroke design, I would say it would be more appropriate as a Diesel. |
RE: Designing own engine.
ORIGINAL: DarZeelon ORIGINAL: Lahha It's 60cc. Bore: 25.00mm Stroke: 30.00mm The bore and the stroke you had quoted calculate to 14.73 cc, or roughly 15 cc; not 60 cc. From the long stroke design, I would say it would be more appropriate as a Diesel. |
RE: Designing own engine.
ORIGINAL: Lahha ORIGINAL: DarZeelon ORIGINAL: Lahha It's 60cc. Bore: 25.00mm Stroke: 30.00mm The bore and the stroke you had quoted calculate to 14.73 cc, or roughly 15 cc; not 60 cc. From the long stroke design, I would say it would be more appropriate as a Diesel. Oops! Lahha, I only read your last post and was assuming it was a single cylinder engine... Now, I see it is a four-cylinder engine... |
RE: Designing own engine.
No, I would not use a car engine for this, they often run at 30-40,000 RPM. Any .40 or larger sport engine would be good. Considering you are looking at 15cc per cylinder, I would try to find a larger engine. I'll look to see if I have any timing specifications for larger engines.
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RE: Designing own engine.
When I designed my first engine a number of years ago, I based the timing on an older Super Tigre .40 I had in my parts bin. I made it a .65 but it ran great.
AJC |
RE: Designing own engine.
My friend said that i can take a look at his engine on friday.
Thanks for the tips. |
RE: Designing own engine.
ORIGINAL: RaceCity Exactly what GK said. What would be wrong with taking the porting/timing of a current successful engine, and applying it to your own? "Men of Steal" have long dominated the scene. Good luck with your project, and won't you have a grin on your face when that baby fires off for the first time. You can't win if you don't play. Go for it! |
RE: Designing own engine.
I am somewhat of an incrementalist. I would first make a single cylinder engine, then a twin, then three cylinder, then four, etc. etc. Learn a lot at each step and end up making a better four cylinder than if I had started there. ;)
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