DutchYouTube video FST twisting Announcing FST Jan 19th 2008 Foekema-Kreidler 50cc-Racing |
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FST prototype twisted first on sunday March 16th 2008 at 20.00 hour
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| FST after one year To day 19th of January 2009, it is one year ago when this new system was announced. 16th of March 2008 the first prototype twisted for the first time. After that the engine doesn't do what we espected, so we stopped for a little time. At the end of 2008 we started to make a new engine, of which the tranfers in the cranckcase were modified just how it has to be. The first engine was used from the 90cc sprinter, which has a big bore and would give enough room for a 50cc FST cylinder. Because the engine doesn't work well, the thought became that this was the problem. The only way to find out was build a dedicated engine. By starting the new engine I heard immediately that the problem still exists. So after one year not good news, so the chances of succes are a little lower. But ideas enough to correct the situation, so it is sure not the end of the project. If there are new results, these will be published directly. "He twisted" was my first comment On sunday March 16th at 20.00hour I could announce that the first Foekema Symmetric Twostroke has twisted for the very first time. It is an aircooled 50cc Kreidler engine with 4 exhaustports and 2 exhaustpipes (each pipe with 2ports), 10 transfers en one 30mm rotary valve inlet system. It was de first time it has been started, much smoke of the oil which was inside the new cilinder. Now many details had to been adjusted in the coming period. After announcing FST Jan 19th 2008 After the announing this new FST twostroke system on Saterday January 19th 2008 at 20.00h, every thing has been done to be the first one who realised a new twisted system. Before touching one peace of metal, I started to make many calculations, which confiscated about a month. This seems to be much, but I wanted to take no risk to realise an usefull system. And every thing during this time show to me that I was going the right direction. Ofcourse many people doubted if this new system would work. The only way to find out is to make a working prototype. I have to admit that Frits Overmars gave me the push to do it, otherwise I would have it only in my head, as he did for about 30 years. But now realising it, I do not regret it for one moment. Developping new engines If it would fail, I lost 2 month work in prepearing my racing engines for the comming year. But now it seems to be a working system I have to change my plans. Two month ago I did write in an interview that 35hp on the backwheel is not very realistic for a 90cc, but now I will change my mind about that. Because in the mean time some changes in electronics could also have a very big influance. New chances After the announcing on Jan 19th, many replies I did receive and also some corresponding did appear on this subject. Some people I did not speak for almost 40 years and may be this wil open new ways. The sound will be special The sound on the video is a little soft, in reallity it is not. The two pipes are almost 100% the same, even the bended part after the belly is the same. The difference in length is within 1 mm and can be corrected by shifting the pipes on the headers. May be this can be done on the sound, because the human ear is very sensitive for small differences. System already exists? From many people I heard this system already exist, but not one proof on paper or one photo is available at this time. Most symmetric systems there were in the past were not 100% Time Area. So I take those talks till this moment not for real. But the most important proof is "where has the system remain to day?" I don't see it, wasn't it not good enough? The first sound I heard from the FST is not like it will disappear very soon. The principal already exist but......... The last alinea I wrote 16th of March. A short time after that I got the information about a mini engine for model airplanes. It was made in Russia in the periode 1950-1960, so almost 60 years old. The engine cilinder was occupied with 6 transfers and 3 exhaustports which flow directly into open air. The FST system with 4 exhausts is occupied with 2 full exhaustpipes, has 50cc and is dedicated for racing on 2 wheels. And that means a totaly differant situation. Patent FST allready exist in 1986 Supprising was it to read that the system was patended in 1986 by a Britisch person, while the principal already exists from about 1955. That proofs that even the patent administration is not that accurate as we thought. Two-stroke engine inlet and exhaust ports GB Patent # GB2190957 Link to this page Inventor(s) PROKOPIUS JOSEF PETR Abstract of GB2190957 The exhaust ports 2 are in a row occupying the full circumference of the cylinder bore and separated only by narrow bridges 4, the exhaust ports being situated above a row of similar transfer ports 3. The subscription is exactly the same principal as the FST system, only the number of ports is different. As many times happens, this patents is not used succesfull in real working engine, otherwise it would still exist to day. So to day, we still are able to say, that a twostroke design with a number of full exhaustpipes, besides the FST not exists. The FOS of Frits Overmars As espected, Frits is very professional working on his FOS, which is the same system as FST. But working in that way will also take much time. Unless I espect that he will be ready very soon, because he wrote in february 2008: "It only does matter who will be the first one, to show up a working system" He also has a great confidend in his system, as he used a real Honda 125cc production racer for his FOS project. Dean from Los Angeles did use the "Holy Wonder" in 1968 I had that same sort of thought in 1968 when I was racing karts. I realized there was no where near enough exhaust area on the McCulloch kart engines. So I drilled 18 exhaust holes above the intakes. Vented to the atmosphere. After some experimentation I discovered that at low speeds the intake charge went directly out the exhaust, so there was no such thing as low end torque. Since is was ported directly outside, at low speeds, like at starting, it blew fuel out of everywhere and gave the distinct sound and visual impression of a blown head gasket. Once it came up on the pipe, it produced glorious amounts of power. It was named the Holey Wonder, not only for the holes, but for the unworldy sound it made at full pop. The conventional ported McCulloch would wind up to 12-13,000 rpm. This thing made 18,000 rpm. Won quite a few races with it. The rod wasn't up to the task I soon found out. It would last about 3 short races and break. Always at the top end of the rod. And then it would transform itself into an 18,000 rpm buzz saw. I still have scars from one of the grenade jobs. Piston ring life on an extreme ported engine is not long, but you live with the trade offs. Forum Landracing forum Announcement FST on Jan 19th 2008 Maibox 50cc-racing
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New FST engine 19th January 2009 FST 50cc first engine 16th March 2008  First FST 50cc cylinder, 4 exhausts 10 transfers  First FST 50cc cylinder fully around tranfers  FST 50cc cilinder 45 degrees turned  Halffabrics for 50cc, still much work to do  Only cool elements of the Kreidler RS cylinder  Overmars cilinder for Honda 125cc racer
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