Yamaha TRX850 Enthusiasts Forum

Interesting reading, a few ideas here.
http://www.iop.org/EJ/article/1742-6596 ... 45_008.pdf

Way to go...Bit like the Tai Chi of motorcycle Cylinders and breathe in breathe out

my head hurts now ,,,,but it dont take much

Suzuki were doing the swirly stuff years ago, called it TSCC (Twin Swirl Combustion Chambers).

I think your a bit confused,Stormy.All engines rely on some form of "swirly stuff" for in cylinder mixture distribution. Tscc is one type of "swirly stuff" thats been used since the 1930's on some 4 valve heads.Yamaha 5 valve heads are characterised as low velocity tumble flow .Although they can give excellant flow figures , the in cylinder mixture distribution is poor meaning they don't make as much power as the flow figures may suggest. This paper is about ways of improving mixture distribution in a five valve cylinder.Direct injection, twin plugs and swirl with tumble is something I will be trying in the tdm based engine I will be building when I can find a suitable fuel pump that doesn't cost more than the bike.

If my often faulty memory serves me well I remember reading somewhere that the TSCC system used by Suzuki was actually developed by Fiat and Suzuki were using it under licence.