I too have been fascinated with turbo power to as you say, to release the genie.
I have a 2.2 turbo Shelby Dodge 4 banger that I was able to do lots of research and therefore modifications to get a pretty reliable 360 plus HP. I also have other turbo charged sport racing cars. My desire to apply such knowledge to a VW or other aircraft power plant, is not only the control of the boost, i.e. waste gate, but I have more concern on how to properly control the air fuel mixture. This is because the fact is, when you increase boost, you directly effect air fuel mixture. To much fuel and we all know that washes the cylinder walls and we quickly waste the piston rings, if the air fuel mixture gets to lean. then we experience burnt valves and if it is to lean we can burn a hole in a piston in just seconds. Of course the other issue is the higher air temps of the mixture, that's of course is why intercooler's came to be. But an intercooler is not mandatory. In the early days of turbo charging, the fuel mixture was a major source of engine failure. The advent of computer controlled air fuel mixtures, better metering of fuel by fuel injection, better intake systems designed specifically for turbo's, map sensors, O2 sensors and so on. All these technologies allowed for letting the genie out of the bottle with greater power and more reliability. Of course all those great technologies come with much greater complexity and of course more weight. If I was building another plane and it was a lot bigger then a KR2, I would not be as concerned. However, all the turbo systems that I have seen associated with a VW for an experimental airplane, all looked to be of the older technology. Not what I want to fly behind. I certainly do not want to be tooling around the sky without the needed gauges and systems to monitor a turbo and therefore making me wonder? Is my engine running to lean, is it running to rich? Is my turbo developing 5 lbs of boost or is it developing 20 lbs of boost? As I say, I am fascinated by this subject and would enjoy hearing more from what Orma and others have done and learned. Jeff York KR-2 Flying N839BG Home page http://web.qx.net/jeffyork40/ My KR-2 http://web.qx.net/jeffyork40/Airplane/ to see my KR-2 Email [email protected] ----- Original Message ----- From: "Orma Robbins" <[email protected]> To: "KRnet" <[email protected]> Sent: Wednesday, November 15, 2006 6:17 AM Subject: Re: KR> turbo > Hi Net > This reply is a bit late, but perhaps will aid anyone wanting awesome power. > Getting the genie out of the bottle is not a problem, keeping the genie from > blowing up the bottle is quite a bigger concern. I wrongly used the > rational.---- Ford utilized a t3 in the turbo coupe and made 180 or so HP > from their 2300 engine. In the Turboford.org forum, there are guys with > 300HP and up versions. My 2366 type 4 VW has a shorter stroke then the ford > and is probably making way over the magical 100HP. I was wrong in thinking > that I actually had time in the cockpit to manually control the boost. I > would always start with the waste gate open and set my boost on the roll, > during the first few seconds after full throttle was applied. keeping > control of the power is the essential part. Full boost would have been too > much for the engine as it could easily make over 40hg on a cool day. > After one more vehicle project I shall return to my KR engine and this time > I plan to install a BOV. > > I'm not sure an automatic waste gate is a good idea. at altitude, how well > will it function? . > > I could not use full power and full boost at the same time between surface > and say7000' I have been to 10 and still had plenty of boost at full > power. I will probably have to fly it west to see what it can do. I have > not had the pleasure of doing that yet. > > If I'm correct a smaller turbo spools faster but gives you less total boost. > > Orma L. Robbins > N110LR 1984 to present > > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html
