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Newer cylinder reed valve intake engines have windows in the piston which leaves intake port open for a full 360 degrees of crank rotation, letting the reed valve dictate opening and closing periods. They are also using chamber on cylinder behind the reed valve to help scavenging, by connecting...

Sorry,I mean the main advantages of each intake design. Srad

Thanks kcj on reply, I know all itake designs, I wanted to know main differences between cylinder and case reed intake on newer 2 stroke engines? Srad

This text is interesting and it says that crankcase reed valve design has better bottom power and torque compared to piston induction, this were one of first reed valve engines...

Thanks on reply. I was thinking for both intake designs with reeds,(newer bikes like Aprilia rs 125, Yamaha yz 125, Cagiva Mito...) So it looks that cylinder intake design for serial bikes is maybe used because of cheaper engine development and without sensibly lack of effectivity in direct gas...

I saw two Gilera 125 engines which are exactly the same except intake position design. On one model intake it is positioned on crankcase and on the other model it is on cyilnder( the models are the same year and have same carburators). Are there any benefits of each design ? Thanks Srad

Malbeare, this project is great. I can see that you are working mostly on V2 type(because it looks that the "6-stroke" cylinder head cant be done on 4 cylinder inline engines) V2 or V4 engines are very interesting for development in prototype racing which MotoGP is. Keep up with good work and...