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  • Users: Deividas
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  1. Deividas

    Hydraulic lifter wear

    Hello, Maybe someone has ideas, how in ~1000km exhaust hydraulic lifter can wear like in these pictures: Also, camshaft lobe for this lifter is also worn, but I don't have pictures of it. Engine has 16 valves, but only one lifter is worn, other lifters and cam lobes are in good condition. I...
  2. Deividas

    Cylinder hone after 10k km

    Hello, Half year in weekends I was rebuilding my old Alfa Romeo engine. Cylinders were re-bored and honed, new larger pistons with new rings installed, main and conrod bearings replaced, new valves, valve guides, valve stem seals installed, all other seals and gaskets replaced. And, as it was...
  3. Deividas

    gasoline direct injection compression ignition engine

    Hello, sorry if this question is dumb, but why it is difficult to use petrol in engine which is like diesel? What if petrol would be injected into hot air near tdc using high pressure fuel pump and direct injection, also higer cr engine, like in diesel engines? I saw, that few years ago, Hyundai...
  4. Deividas

    "Comprex" pressure-wave supercharger

    Hello everyone, i wanna ask some questions about this device, it's very interesting method of air charging (to me), first question is: why this device was only used in diesel engines? (except Ferrari formula one experiments)? :)
  5. Deividas

    Main bearing diameters and engine rpm

    Hi! In this article ( http://www.hotrod.com/how-to/engine/hrdp-0401-torque-horsepower-guide/ ) i read, that at high rpm, smaller bearing diameters is better than larger, "Some engines aren't happy at high rpm-and never will be. Their bearing diameters are too large, their strokes too long, and...
  6. Deividas

    Why inline-4 engines needs counterweights?

    Hello, if in inline-4 engines primary forces are balanced (1-st and 4-th cylinder balances 2-nd and 3-rd cylinder) then why does it need counterweights on crankshaft?
  7. Deividas

    Engine power LPG vs. Petrol

    Hello, i'm thinking, why petrol engines (most of them) have less power, when running on lpg (sequential injection)? It's because lpg has lower energy density (lpg propane 25.3MJ/L, lpg butane 27.7MJ/L vs. petrol 34.2MJ/L)? But LPG has higher specific energy: lpg propane 49.6MJ/kg, lpg butane...
  8. Deividas

    Crankcase ventilation systems

    Hi everyone! I have some questions about crankcase vent systems with pcv valves. there is one system there is another system and there is pcv valve My question is, when and how fresh air from intake before throttle plate could flow INTO crankcase? Like in second picture. If at idle pcv highly...
  9. Deividas

    A/f ratio for max temperature and pressure

    Hello, I was working with one ICE simulation program, and noticed, that in diesel engine, where a/f is 1.75, max combustion pressure is 128.81bar, and max combustion temperature is 2118.1K, and in same engine, where a/f ratio is 1.5, max combustion pressure is 115.71bar, an max ombustion...
  10. Deividas

    increasing torque without any big modifications

    Hello. I wanna ask, how increase engine torque without increasing displacement, compression ratio, and fuel consumption? Or how new engines increase fuel efficiency and power, when compared to older egines? I know, that new engines have higher CR, ecu controlled fuel injection and ignition...
  11. Deividas

    Question about clutch type limited slip differential

    Hello, i was wondering, why in clutch type LSD, manufacturers use clutch packs on both driveshafts, if is possible to lock differential by connecting only one driveshaft to differential housing? Thank You for answers :)
  12. Deividas

    Turbo & restrictor

    Hello. How restrictor on turbocharger changes power and torque? In my opinion, restrictor increase air flow speed in turbo and decrease pressure (venturi effect), so ammount of air will be the same because speed was increased or not? And why on high rpm power drops with restrictor on turbo...
  13. Deividas

    compression ratio vs. peak cylinder pressure and thermal efficienty

    Hello, Merry Christmas to everyone! I wanna ask: if I increase compression ratio, cylinder peak pressure also increase? And how compression ratio increases thermal efficienty?
  14. Deividas

    Secondary engine balance

    Hi! I can't understand, why seconadary forces are 2x per revolution? why from 0deg to 90deg secondary force curve goes down, and from 90deg to 180deg curve goes up? can someone explain?

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