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It is unforgiveable not to minimize mass of piston and conrod for single cylinder engines. CAD system calculates mass and center of gravity very precisely. Crank is develloped to minimum mass on the buisness side and then put all the contra mass on as possible. Ballance shaft as basicly a...

I want a new toy. Swan 120 SW Expensive toy I am not keen on engine that is a hard pressed single cylinder Pollini 303 (38 hp/8000rpm) with a reduction gearing turning a 1.5m prop ca 42 rps. Can of course make something better but will have to make a model to show all the doubting,wise guys...

Thank You for an enjoyable trip back in time. In 1965 I rode a Nimbus in danish army and in 1974 I learnt and was tested sidecar driving with another Nimbus. Four throw crankshaft hung in two ball bearings and a single OHC camshaft and visible valve springs. Nimbus history link Nimmer

A picture of a DLE crank made same way as Dieter describes Boxer Crankshaft

We are talking of different things. OP wants to make a boxer crank for two 2.5 ccm opposed cylinders . I try to calculate mass difference between making the crankshaft as a pressed up thing like mr Dieter has done or using a screwed construction like the one I posted from a V2 dream of mine...

Your method will work just as well for a V2 crank. I have tried to compare mass for Your pressed version with my screwed and difference for a 5ccm V2 will be less than half a gram. ByeBye feeling a genious on that account but it was nice,free and unpoluting as long as it lasted. Thank You for...

Anoter picture of screwed crank for V2 engine

Have started on dimensions from Holly Buddy. Significant change is 6mm instead 5mm crankpin diameter but only 8 long instead of 10mm. Are there someone that has indicated a model Diesel (that is not a diesel)? What is max pressure?

OK. Let us agree on some numbers. Bore and strokes in mm please. The two pistons need not have same diameter,but same mass Big end bearing size(Crankpin dia) Conrod mass Conrod hole distance Piston mass.

Hello Patrick Are You still interested in seing and diskussing V twin crankshaft proposals? I have speculated a lot many years ago and like to explain. Niels

Welcome Most likely problems are the piano that controls the rpm and direction of motor and that the gearbox selector forks,made of toothpaste are broken. Solution? Three phase AC motor and converter The toolholder system is very flexible and web is full of drawings of how to make it more rigid

A range of 5 to 50 kW Range Extender gensets will surely be needed. Fuel either compressed natural gas or hydrogen. On roads with more than say 100 cars and permitting higher than 50 miles per hr ,cheapest and best propulsion system is nuclear power and pick-up electric contacts on road. For...

A sure way to get rich and famous. I tried and failed so field is still open. There is an obvious need of having an si combustion engine that generatec 5 to 50kW electricity using alcohol,petrol, CNG etc,ect. for reserve and range extending in electric cars. From first principles it can be...

Let me phantazize: A single cylinder SV Two stroke that runs half the mean effective pressure of a fourstroke give same power at same rpm and has to endure half the maximum pressure. The big ca 20 horsepower /540 ccm/ 60 rps/94mm bore/78mm stroke four stroke OHV singles can be substituded by a...

I assume You refer to the 500 ccm single cylinder from B&S with ca 17hp at 60 rps and around 30 kg mass. What is the anti vibration system and do You have diagram of installed measurents. For my own pleasure I will scheme a better mousetrap but wonder if the two cylinder V engines sell better.

I have dreamt of a side exhaust valve two stroke with normal less than one percent oil/petrol crankcase lubrication. More even fire,lower mass,lower fuel consumption etc,etc . What are the Google search terms for these B&S motor turned bombs histories mentioned? Future lawnmover engine Turned...

I put a homemade spindle with 28mm hole,ER 40 thread and cone in a cheap chineese 180 lathe. Cone and thread was machined in situ the Schaublin way and surprisingly accurate. Cheap and accurate The screwed on four chuck was once started fast in reverse. I swore never to use screwed on chucks...

A start for glow head engines interest can as well be SAE paper 2002 -01-0115 Olaf Erlandsen, Lund University ,Sweden. The term Semi-Diesel is nonsense. Invented by marketing. The Exhaust smells completely different to a diesel engine. I got paper as pdf 260kb document from mr Erlandsen 2004...

The model live steam locomotive fraternity are getting thermal efficiencies 1 to 2 % from less than 500W locomotives. Coalfired boilers with up to 5bar internal pressure. Numbers here Small Steam efficiency With dry wood available , a small suction gasgenerator with a combustion engine was...

There was a picture of a wet sump ,sidevalved two-stroke twin since removed. Clean twin,two-stroke