To: John Hanzl who wrote (2233 ) 2/24/1998 1:09:00 PM From: shashyazhi Respond to of 6464
I watch the stories of new model introductions in the magazines that I subscribe to, and I see that a new model is going to appear in the spring. Then I go to a trade show, and I find that the new model is there, and the speed merchants already have a prototype of their product on the new model! There is a large pool of grass roots knowledge about pulse tuning out there. The Japanese produce a new engine, and the tuners know what they want to do with it before they ever get their hands on it. Engine development is evolutionary, not revolutionary. Pulse charge tuning can be applied to any engine that BAT wants to modify. There is some empirical data out there for the researcher and some cutting and trying is indicated, too. Wave speed in the intake system is based upon the temperature of the air in the intake tract. It is relatively constant in a direct-injected engine, because it does not have the evaporation of fuel to take into account. In the exhaust tract, the wave speed is affected by the fact that the gas is cooling rapidly. Some tuners wrap the exhaust pipes with insulation to keep the temperature as stable as possible. A tuner can spend a lot of time with computer analysis of the exhaust system, or he can do a lot of cutting and welding on exhaust pipes to create a prototype that does just what he wants it to do. If BAT can get enough funding, it can probably do the necessary prototype work on half a dozen engines each year. I don't see BAT as a "one trick pony". They are looking at more than one area of technology at the same time, and now they need some financial backing to progress. The Yanmar motor is not at all a rare engine. Check out the web and you will see many dealer's websites. The Dolphin pulse charge technology is also being tested in two race cars. One of them is a Porsche being run in vintage sportscar races. The other is an off road vehicle with a modified VW engine.