Engines > Your Own Design
V-TWIN--MAYBE V4
Brian Rupnow:
Per-to give you an idea of what things cost here--I bought two Traxxas carburetors from the USA for thirty five dollars each. By the time I paid for them, the difference in our dollars, the shipping and the tax, I paid $130 Canadian. So when I see something for sale in USA I know it will just about cost me double the advertised price to buy it.---Brian
Brian Rupnow:
And now, it's time to go all scientific. The engine runs, but it doesn't run the way I like it to. The left hand cylinder runs like a champ, the right hand cylinder runs some of the time. Some of the time, it doesn't run. and when it doesn't run, it puts so much drag on the left hand cylinder that it stalls out under the load of carrying the non firing cylinder. Generally I use a degree wheel to set the valve timing, and lay the sparkplug out on the cylinder head so I can manually crank the engine over and watch to see when the spark occurs relative to the piston position. Somehow, that doesn't seem to be working for the right hand cylinder.---So, tomorrow I will once again get my degree wheel out and set the valve timing on the right hand cylinder. (The engine has a camshaft for each cylinder bank). Then I will pull the cylinder head off and put a dial indicator on the piston so I can set the spark timing up to occur exactly when the piston is at top dead center. The right cylinder has good compression, and the engine has "loosened up" considerably from running. I have tried a couple of different sparkplugs in that cylinder, and it makes no difference. Other folks have had better results with this style of engine, so I don't think that the problem has anything to do with the engine design.
Brian Rupnow:
Just so you know---I have saved all my drawing files for this engine as .pdf files, and they are now for sale for $25 Canadian funds. I sold the first set today and will be happy to see someone else build this beautiful engine. I have been very busy with "other stuff" since Christmas. This engine runs, and if I can get my tired old arse in gear I hope to do some more fine tuning on it. If you are interested in purchasing a complete set of detail drawings and assembly drawings and material specs, contact me at brianrupnow@gmail.com
Brian Rupnow:
This is the v-twin configured engine that I built last year. I was never totally happy with the way it ran, but ill health and work for money has kept me from spending much time on it. I decided that since this engine was basically two separate engines running on a common crankshaft that I would remove one cylinder, piston, and con rod and tune one engine to run satisfactorily, then set up the other engine. I had made the cylinder heads from brass, which was very pretty, but almost immediately pulled the threads out of the sparkplug holes.--Lesson learned--Make heads from mild steel or aluminum in future!!! You can not buy a 5/16" threaded sparkplug, so this meant that I had to make two sparkplugs of my own with 5/16" threads and re-tap the cylinder heads for the next larger thread, which was 5/16". Today I finally got around this morning to running this engine as a single cylinder, and I am quite pleased with the results. Next step will be to reinstall the cylinder, piston, and con rod for the other half of the engine and get the engine running as a twin.---Brian
http://www.youtube.com/watch?v=iacMzVEj24g
Admiral_dk:
Sorry to hear that you have been poorly - and I hope that your post indicates that you are feeling well again.
It appears to be idling with a steady beat :ThumbsUp: + you posted this video -> I assume that you are happy with the result so far too :cheers:
Per
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