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Hello all. PatCVT In the PatCVT a sprocket or gearwheel (actually an idler) is intermeshed with "teeth" on both spans of the V-belt. The displacement of the center of the sprocket varies positively the transmission ratio: enabling various "modes" of operation: Drive Mode...

Hello all. The PatATE architecture is not restricted in small engines. It fits with small engines, it also fits with normal size and big size engines. And it seems (theoretically for now) that it solves several crucial problems of the normal size 2-strokes. Thanks Manolis Pattakos

Hello all. The following is quote from Exhaust bridge - Honda 2-Stroke - ThumperTalk UtahTrailRide: "Can someone explain to me what the deal is with drilling pistons on the exhaust side. I've heard the CR125 needs the piston drilled but I sure didn't in my last rebuild. Now I'm all...

Hello Niels. In the following it is further explained the difference the PatATE architecture brings to the 2-strokes. Here is the port map of the famous Aprilia RS250 of 1999 (two cylinders in V90, oversquare design with 56mm bore and 50.6mm stroke): The porting is focused on the faster...

Hello Iohring. Thank you for your response. Currently in the market there are no 2-stroke engines propelling cars or motorcycles and complying with the current emissions standards (euro4). The only exemption is the KTM250-300EXC, model 2018. Qute from...

Hello all. In another forum someone wrote: “When 2T runs the same compression ratio as 4T then it runs with the same expansion ratio. Only the start and end points are different. View the 2T from a different perspective. It is an engine that uses half of its cylinder for gas exchange and...

Hello all Regarding the power and torque gain when the expansion extends: Here is the pressure (and the torque) versus the crankshaft angle of a typical 4-stroke engine: It is from Taylor’s book “The Internal Combustion Engine in Theory and Practice”. After the closing of the...

Hello all. Here is an Opposed Piston PatATE: In case of divided load (Portable Flyers with two intermeshed counter-rotating propellers, Electric Power sets with two counter-rotating generators, Marine Outboard engines driving two counter-rotating screws etc) the synchronization...

Hello all. The following version of the PatATE seems the fittest for realization in metal. It has the typical arrangement, with one only hybrid port “looking” forwards and one intake port at the back of the engine. The width of the hybrid port along the periphery of the cylinder...

Hello all. Here is the port-map of the famous Vespa 125-150 (57mm stroke) and here is the port-map of the famous TZR, KR1 and RGV two stroke engines: The height of the exhaust port is more than double than the height of the transfer ports in all cases. The timing is symmetrical, say as...

Hello all. I hope it is clear that the rotary valve is not dealing with the sealing of the combustion chamber. The piston with the piston rings that slide on the (stationary) cylinder liner do the sealing as in the conventional two-strokes. The rotary valve is arranged outside the...

Hello all. The following plot and animation has been added in the http://www.pattakon.com/pattakonPatATE.htm web page. They show a possible timing for the PatATE with the rotary valve. The same animation at slow motion is at...

Hello all. Two more animations of a PatATE with rotary vave: and Thanks Manolis Pattakos

Hello all. Instead of the flap valve, a rotary valve can be used for the control of the communication of the hybrid port(s) with the transfer and the exhaust passageways, say like: In this PatATE design there are two hybrid ports arranged anti-diametrically on the cylinder liner...

Hello all. Here is an unconventional two-stroke (the PatATE) in comparison to a conventional two-stroke: The main difference is that the exhaust port is now a "hybrid" port (the 4): at the end of the expansion the valve 7 connects the hubrid port with the exhaust passageway 5, and the...

Hello all. Today the US Patent Office (USPTO) mailed the Issue Notice for a patent granted for the PatATi engine: More at http://www.pattakon.com/pattakonPatAT.htm and http://www.pattakon.com/pattakonPatATeco.htm Officially the patent is to be published July 4, 2017. Thanks Manolis Pattakos

Hello all. Today the US-PTO published the USA patent granted for the PatRoVa rotary valve. Here is the link: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9677434.PN.&OS=PN/9677434&RS=PN/9677434 Thanks...

Hello all. According an Issue Notice of the US Patent and Trademark Office: a patent is granted for the PatRoVa Rotary Valve. The patent number is US9,677,434. Thanks Manolis Pattakos

Hello Dennis and thanks. The sealing is based on keeping the clearances too small, preferably without sealing means (which require lubrication, consume energy, etc). The question turns to whether the PatRoVa design can keep the clearances as small as required. The form...

Hello all. The following drawings show a 2-stroke Flat-Head PatRoVa: The last animation is stereoscopic (more on how to see stereoscopically at http://www.pattakon.com/pattakonStereoscopy.htm ) The piston is shown in...