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Engineering
Mechanical Engineering
Turbocharging carbureted petrol 2 stroke engines
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[QUOTE="ChemAir, post: 6390435, member: 643034"] As someone with turbocharging experience with V-8 4 strokes, I'd wonder first how you will get oil to the bearings in the turbo. 4 strokes have captive oil systems at fairly high pressure and good flow is required to keep the bearings cool. The crankcase will also have to be able to handle much higher pressures than normal. I'd also wonder if spark advance may need to change, and without EFI, I'm not sure how you'd manage this, unless it was mechanical. The compressor side of the turbo will provide some back pressure that could increase power on the engine. The downside is a ton of fuel will be blowing out as well. This will have to be managed by pipe sizing (volume and diameter) and will have a limit, and may only be operable in a very narrow flow range. I don't know that the power gain will offset the efficiency loss and the weight increase for making the modification. A draw through carbureted setup may work, but I suspect with all the exhaust/turbo tuning/sizing that will also influence this, it may take you a long time and lots of trial and error to find a workable combination. [URL='https://www.physicsforums.com/threads/a-turbocharged-two-stroke.64413/']Here's an old forum thread on this.[/URL] I think the last post shows a two stroke outboard that has some kind of servo control that can change back pressure on the motor by some type of wastegate. [/QUOTE]
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Turbocharging carbureted petrol 2 stroke engines
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