Thanks everyone for responding, this have been an invaluable learnign experence and as concept its interesting but as much experenced people have said and validated some of my fears it might not be my best option.
Right now I have been going with an EFI system as with my other plane and even with some of the controls that the ECU module would handle (auto fuel mixture adjustments based on O2 input and such) it just adds too many variables. Maybe in the future after the plane is done I can modify it for the turbo. Here is my idea, I can have the intake built to handle the turbo and be facing the right direction but for now simply have cold air in. This way if I ever want to experement with turbo in the future I can simply change the exhaust. Next I can add all the sensors (planned to anyways) as well as the upgraded electronics that can work in normal as well as boasted rates. This way I can test out all the electriconics and all of that is working before ever considering the tubo. I can see how well the VW 2400cc engine will perform and leave the turbo option as an option in the future without alot of rework. Its so nice to learn from all of the people on this forum, it's so nice to have an open community where questions are welcomed. I continue to look forward to all information on this and every subject. Thanks again 3rd day into the year, but HAPPY NEW YEAR ALL Joe On Mon, Jan 3, 2011 at 12:20 PM, Jeff York <jeffyor...@yahoo.com> wrote: > I, as well as Steve (as he stated) would enjoy hearing more about the > positives > on turbo charging too. > > That said, I want to say that I did not want to come off sounding negative, > I > just wanted to point out my concerns about turbo charging from my > experience's > in high performance turbo charging. There are so many benefits to turbo > charging > > an engine from performance in power and fuel economy. Yes I said fuel > economy > and what I meant by that was you can run a normally smaller displacement > engine > to gain economy while getting the benefits of additional power by force > feeding > air/fuel via the turbo. My problem was I never could keep my foot out of it > to > really see the fuel economies but they are there. > > Also, my experience was performance related and not of the altitude > normalizing > that would be associated with aircraft turbo applications. However, some of > the > same issues apply. I pointed out, and Steve and others pointed them out as > well. > > > > The main concerns I would have are oil and engine temps due to the very > high > temps a turbo can achieve. As I recall 1600 degrees F. As Steve pointed > out, I > would never consider a turbo without a intercooler. An intercooler is used > to > cool > > the turbo charged air fuel after it goes through the turbo and before it > enters > the combustion chamber. Do not mistake the idea that an intercooler is for > cooling the turbo charger. Its not. That will be the job of your over sized > oil > cooler. > > > > When the engine in a turbo charged motor is shut down, that 1600 degree > turbo > (which is oil cooled) will act as a furnace to cook the remaining oil in > the > turbo. This will effectively coke the oil. This is why normal shut down of > a > turbo charged motor is not recommended. Its why turbo timers are used to > circulate that oil after engine shut down. > > I know the Dragonfly guys and Tri Q guys did a lot of turbo charging of the > Subaru motors and some of the Corvair guys had been looking into it or have > done > > it. But I believe weight and engine life issues may have slowed down or > halted > the use and development of those turbo applications. One more thing. It was > my > understanding when I did turbos on performance applications that you did > not > just slap a turbo on any engine. Don't put ten pounds of boost on a 9 to 1 > or 10 > > to 1 compression motor and expect it to hold together very long. You will > effectively have a > 19 or 20 to 1 compression motor. These are diesels. That kind of > compression > will blow up > a motor. Also, make sure you have the right exhaust valves to handle a > turbo or > you will be burning them > > up. Not fun pulling off to the side of the road at 10,000 feet when you eat > a > valve cook a piston or blow a head gasket. > > It was a lot of fun doing turbo apps in automotive applications. Computer > controlled air fuel metering, precise BOV/ Waste gate control, air/fuel > mixture > control and other systems > > allowed reliable power gains. I am not sure I have seen anything better > than old > > unreliable mechanical systems available to do this on a VW motor. But what > the > William Winns and MJ's and ML's are doing with the systems they have > available > on Corvair motors would to me seem to be the better platform in which to > start a > > turbo project. > > I love my GPAS VW and all that Steve Bennett has done. But the fastest way > for > me to mess up all that reliability is to slap a turbo on my VW motor > without > finding out if and how it can be done reliably. > > > OK, I have ranted enough. I too want to hear from those that have done it > so as > to get the positive and learn how. Thats what this is all about. > > Sorry for running on but, I hope I was informative in some way as to the > how > what to look out for and what not to do. I would love to get 70, 80 or more > horsepower out of my VW motor and if I could add a turbo to it and get > reliable > life out of it, I would do it. But, in my opinion, it might make more > sense to > look at a Corvair that can get 100 hp or one of these 23xx VW motors. > > But, lets hear from the ones who know how and have, instead of us (me) who > know > how not to. > > By the way, I worked on some turbo spam cans that came into the aviation > shop I > used to work in. But they were very rare. I have to wonder why they were so > rare. > > Jeff York > KR-2 N839BG > Lexington/ Georgetown, Kentucky > > > > ----- Original Message ---- > From: "Teate, Stephen" <ste...@compositecooling.com> > To: KRnet <kr...@mylist.net> > Sent: Mon, January 3, 2011 10:22:28 AM > Subject: RE: KR> To Turbo or not to Turbo that is the Question > > > "I've already heard some of the negatives from others, but does anyone have > a > list of positives?" > > Both Jeff Scott and Jeff York have responded to this and made excellent > comments > to be considered. I admit I am biased to the positive side of turbo's so I > will > add my opinion. > > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > -- Jose Fuentes Founding Father (one of and former Vice Prez) of Capital City.NET User's Group Former Microsoft MVP http://blogs.aspadvice.com/jfuentes
