Jerry,During my drag racing days, I had a Dodge Challenger, with a killer 440 Cu In. engine. It had a huge roller cam in it, (2800rpm idle) so low speed idle and vacuum signal was non-existant. The engine had fender exit headers, and about 3 inches downstream of where the primary tubes joined, a check valve with a tube was welded into the collector. The tube had a downstream facing opening, so when the exhaust pulse flows over it, a vacuum was created.The check valve promoted one way flow, so the exhaust could never enter. These check valves are for where the smog pump injection pump, pumps air into the catylitic converter. 80's Dodge pick-up trucks used one for instance.A 5/8" hose was connected to it and terminated with a breather fitted to the valve cover. This "vacuum pan system" replaced the Positive Crankcase Ventilation valve (PCV), and was worth a couple of horsepower. It was quickly learned that a breather cap had to be added on the opposite valve cover to prevent the oilpan and valve cover gaskets from being sucked in and causing a leak. That's how much power the system had. But remember the application, a large cubic inch engine turning at high RPM's. I never did put a gauge on it to find out exactly how much vaccum the system actually made. Jeg's sells a system in their catalog, or on-line at:http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1783&prmenbr=361 for $31+ shippingJeg's has alot of really cool race car stuff that has application for aircraft use (like Russell hose and fittings).
KRJerry <krje...@bellsouth.net> wrote:Netters......... Have any of you guys looked at drawing a vacum from your exhaust.....? After the Wannabee gets into the air we are going to look into it again. We have both considered it before on other planes.............. N64KR Jerry Mahurin Lugoff, SC krje...@bellsouth.net http://kr-builder.org -------Original Message------- From: KR builders and pilots List-Post: krnet@list.krnet.org Date: Thursday, April 24, 2003 03:13:12 PM To: KR builders and pilots Subject: Re: Re: KR>Glass cockpit-IFR etc.-Long I have heard several opinions on IFR in a KR ranging from it can be done but is a lot of work all the way to you will die if you even attemp it. I haven t flown mine yet so my opinion is worth what you paid for it, but here it is The first thing I bought to add to my KR after I got it was a turn coordinator. I consider this instrument mandatory in any plane that has no other gyro instruments. Simply put, when you accidently get stuck in the soup one day the TC and your previous practice under the hood with it will probably save your life. Keeping the sunny side up without it or any other gyro instruments is a toss of the dice at best. With just the TC and partial panel training from an instructor you have a very good chance of seeing tomorrow. I left holes in my panel for an attitude indicator and heading indicator, but am holding off on the vacuum pump and instruments right now. After I get some time in the plane I will see how easy it is to fly under the hood with just the TC. If I can keep the sunny side up and the nose pointed in the right direction fairly easily I will get the vacuum instruments to make it IFR. If I can't comfortably fly it partial panel then I won't bother making it IFR. Before I get flamed, I realize that the KR is not an IFR cross country plane I would only want it IFR for getting up and down through cloud layers, etc. -------Original Message------- From: Dana Overall Sent: 04/24/03 05:12 PM To: kr...@mylist.net Subject: Re: KR>Glass cockpit-IFR etc.-Long > > I did leave one "opinion" (there we go again, everybody has one) concerning the post about the IFR........I wouldn't build a KR with hard IFR in mind. _______________________________________________ see KRnet list details at http://www.krnet.org/instructions.html . _______________________________________________ see KRnet list details at http://www.krnet.org/instructions.html Scott Cable KR-2S # 735 Linden, MI s2cab...@yahoo.com --------------------------------- Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo.
