Engines > Your Own Design
Dinkus - A Side-Crank Rotary Valve Engine
PaulR:
--- Quote from: crueby on April 26, 2026, 04:01:09 pm ---Boy, looking at the video the pins sure look 180 out from each other, end to end on the same shaft. Hard to tell without a side/end view though! Another thing that HAS to be the same is the distance from the center of each disc out to the center of each pin, on all four pins.
--- End quote ---
The throw looks good on all four. I was just disassembling while making the temporary side rods and the Loctite on the crankshaft decided to come apart :cussing: I'm not having much luck with this engine and my patience is wearing very thin - one more attempt before it ends up in the scrap!
john mills:
what is the distance between the side rod hole they need to be the same as the two shafts the crank pins at each end should be in the same position
at each end
john
PaulR:
Thanks John, I've made two temporary side rods from some scrap aluminium (drilled at the same time) and now that I've got the shaft back together I can turn the engine over and the valve rod is rotating properly instead of oscillating. The only problem I have now is that there's some horrible binding that I need to track down, once that's done we'll see if it will actually run.
PaulR:
I'm afraid to say this one is getting shelved. In principle I think it should work ok but having four cranks disks held by screws was a bad design choice, trying to set them exactly in pairs with the big end in the right place and taking account of the valve timing is horrible. Not only that but I think there's too much lateral force being exerted on the piston and a slight difference in height of the centre line of the cylinder and the centre line of the crank. So that's bad workmanship as well as a bad design :lolb: Never mind, it's all grist to the mill of experience.
Sanjay F:
Never mind, still good going - I think your record of successes vs failures stands up for itself! :ThumbsUp: :ThumbsUp:
Onwards and upwards .........what's next? :popcorn:
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