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| Rotary valve 4 stroke engine. |
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| radfordc:
I'm in the process of developing a four stroke engine using a rotary valve in the head. Here is the concept: The carb will be mounted on the side of the head as was done on the Webra T4 engine: My concern is how the lower end of the engine gets lubricated. If the fuel/oil mix is only circulating through the head and cylinder what happens to the rod and crankshaft? On some models of the Webra the carb was actually mounted on the side of the crankcase and the mixture was inducted through the lower crankcase before going to the rotary valve head. But, obviouly other models of the Webra don't do this. I assume that they rely on fuel/oil blowing past the cylinder ring for lubrication? Charlie |
| HS93:
Looks great, I wonder how you could water cool it for boats ? I have been looking recently at some of the 4 stroke engines on the market to see if they could be water cooled up to now no luck os did one some years ago but because they did not make many they are not cheap. peter |
| radfordc:
If this engine works it would be relatively simple to drill the head for water passages and make a water jacket for the cylinder. |
| nearnexus:
I can't see how you would get sufficient blow-by to lubricate the mains and bottom end bearings, even if they are roller or ball type. Through the crank case carburation looks the way to go. Maybe the engines without this rely on sealed bearings ? Have you checked on this? How are you sealing the ends of the rotary valve shaft ? |
| BarryG41:
Thing is that oil -fuel mixture crankcase carburettor is 2 stroke motors. How long do you intend for it to run? if it is longer than 5 minutes then the easiest is a simple oil pump running off the crank with a total loss sump. i.e. the oil just drips out on the ground. Popular with speedway motocylce racing engines. This requires an external oil container and if you don't like the total loss system add a secong oil pump to scavange the oils out of the sump it back to the oil tank. Now you have a dry sump system. Barry |
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