Auto Repair - Roadshow forum


can ANYbody help figure this out 4 stroke fire every cycle?

by travis.miller.96 / December 28, 2017 9:24 PM PST

ok i kno this gets deep, but im only skimming the surface at the moment. theres obviously things that wouldnt work in its current layout but the basic idea i had is, what if the cam ratio could b doubled in relation to the crank and have a 4 stroke fire every cycle, at first the exhaust getting out of the way and getting fresh fueled air into the cylinder, both valves would have to open at the same time and a positive pressure be on the intake side obviously. the positive pressure could b achieved by a simple electric blower just to get the engine started, then possibly an engine driven blower. boosting an engine is already a huge industry so i dont imagine that would be very hard or expensive. like i said thiss just a random *** thought im not saying its practical, would work, would b cool or anything, im just curious if it would work, i guess it bugs me because i can pretty much build n test things in my head but i cant quite get my head wrapped around everything that has to do with this, i also literally just thought it sitting here watchin tv Silly

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Clarification Request
(NT) then you basically have a 2 stroke engine
by James Denison / December 28, 2017 10:53 PM PST

All Answers

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That's been batted around for decades.
by R. Proffitt Forum moderator / December 28, 2017 9:28 PM PST
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Cycles versus revolutions
by Steven Haninger / December 29, 2017 8:00 AM PST

A gasoline engine cycle of an individual cylinder is the period it takes to draw in fuel and air, compress and burn the mixture, and expel the products of combustion. In a traditional gasoline engine, this is done in either one or two revolutions of the crankshaft. I don't understand what you mean by doubling the cam ratio. In a four stroke (standard) engine, it operates at 1/2 the RPM of the crankshaft so doubling the speed would make it operate at 1:1 with the crank. Is that what you want to express? If so, and for very good reasons. I could imagine, that if it would run at all, you'd have fire coming from both ends of the vehicle. Happy

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