---------------------------------------------------------- LycomingEngines-List Digest Archive --- Total Messages Posted Wed 02/27/08: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:05 AM - Re: Firewall foreward cooling air needs (Michael T. Ice) ________________________________ Message 1 _____________________________________ Time: 07:05:48 AM PST US From: "Michael T. Ice" Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs Ralph, I took the time to look at Vetterman's web site. Damn fine product. Build on. Mike ----- Original Message ----- From: "Ralph E. Capen" Sent: Tuesday, February 26, 2008 6:12 AM Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs > > > Mike, > > Thanks for your response. > > My heater/mufflers are made by Aircraft Exhaust Technologies for Larry > Vetterman's systems. When they're not heating the cabin, the heated air > flows out the valve dump. The requirement is that they always have to > have air flowing over them and they can't be run in series. I've read > that they do provide plenty of heat. > > Sorry for the confusion - I think I will be OK with the setup. > > Ralph > > -----Original Message----- >>From: "Michael T. Ice" >>Sent: Feb 26, 2008 9:22 AM >>To: lycomingengines-list@matronics.com >>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs >> >> >> >>Ralph, >> >>I agree with Dale. I just installed two of those Van's type heat muffs and >>they did not have any internal baffles. The outlet air does have a plate >>in >>it with a bunch of small holes punched in it. I suppose that is to slow >>the >>air down a little so it will have a chance to get warm. >> >>I have heard that it is best to install the muff with the inlet air the >>farthest down on the pipe and the outlet air up. I guess because heated >>air >>rises, Maybe?? >> >>I installed two power port outlets (cigarette lighters) in the airplane so >>the wife and I can wear electrically heated vests. I want to be warm and I >>have never been too impressed with aircraft heaters. Even in the summer it >>gets cold in Alaska especially at altitude. >> >>Mike >> >>----- Original Message ----- >>From: "Ralph E. Capen" >>To: >>Sent: Tuesday, February 26, 2008 3:35 AM >>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs >> >> >>> >>> >>> I actually do want them hot. I'm just going with what Larry Vetterman >>> provided me - 'constant individual cooling air'. >>> If I don't get enough heat, I'll consider the SS Scrubbies or a wire >>> wrap >>> coil. >>> >>> It's an older (small-tail) 6A. >>> >>> I'll check out Doug's area..... >>> >>> -----Original Message----- >>>>From: "Michael T. Ice" >>>>Sent: Feb 25, 2008 11:19 PM >>>>To: lycomingengines-list@matronics.com >>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs >>>> >>>> >>>> >>>>Ralph, >>>> >>>>Hmm! Perhaps I am not quite understanding this but don't you want the >>>>heat >>>>muffs to be hot. From what I have heard getting any heat into an RV (I >>>>don't >>>>know what your building) is hard enough to do. >>>> >>>>I am glad you like your decision with the James cowl and plenum. A >>>>friend >>>>with an RV-9A went the same route as you and is very happy with the set >>>>up. >>>> >>>>Not much activity on this message group. You might have better luck on >>>>Van's >>>>Air Force web site, http://www.vansairforce.net/. There is always lots >>>>going >>>>on that site, check out this link, >>>>http://www.vansairforce.com/community/search.php?searchid=3368738, >>>> >>>>Good luck, keep building, >>>> >>>>Mike >>>>----- Original Message ----- >>>>From: "Ralph E. Capen" >>>>To: >>>>Sent: Monday, February 25, 2008 6:20 AM >>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs >>>> >>>> >>>>> >>>>> >>>>> Mike, >>>>> >>>>> The way I understand it is in order to get a decent heat exchange, the >>>>> heater box metal is slightly thinner - coupled with the fact that it >>>>> is >>>>> a >>>>> muffler internally means that it will get pretty hot. This also >>>>> eliminates using preheated air as an option. >>>>> >>>>> I really like the Sam James cowl. I am still installing the plenum - >>>>> it's >>>>> not fitting nearly as well as the cowl.....too wide in the front, too >>>>> short in the back. I started with Vans baffle kit - but that doesn't >>>>> account for the variances - I was able to adapt the inlet ramps to the >>>>> plenum intakes though....but it took a bunch of work. >>>>> >>>>> Ralph >>>>> >>>>> -----Original Message----- >>>>>>From: "Michael T. Ice" >>>>>>Sent: Feb 25, 2008 9:45 AM >>>>>>To: lycomingengines-list@matronics.com >>>>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs >>>>>> >>>>>> >>>>>> >>>>>>Ralph, >>>>>> >>>>>>I did not know that the heat muffs required cooling air flowing over >>>>>>(through?) them at all times. Why is that? >>>>>> >>>>>>I just installed my carb heat yesterday and I used another one of >>>>>>Van's >>>>>>heat >>>>>>muffs instead of the standard issue carb heat gizmo. I elected to get >>>>>>the >>>>>>carb heat air from inside the cowl instead of cutting another hole for >>>>>>it >>>>>>in >>>>>>the air inlet ramp. That is the way Cessna and the standard Van's carb >>>>>>heat >>>>>>muff does it and it seems to work just fine. >>>>>> >>>>>>For the air supply to the heat muff for cabin air I went even lower >>>>>>and >>>>>>took >>>>>>the air from the plate right next to the cylinder fins. I and others >>>>>>have >>>>>>thought this is a good place because the air will be pre-warmed as >>>>>>much >>>>>>as >>>>>>possible. >>>>>> >>>>>>How do you like that Sam James cowl? >>>>>> >>>>>>I had a tough time getting my Van's standard issue cowl to fit. >>>>>> >>>>>>Mike Ice >>>>>>RV-9 >>>>>>firewall forward >>>>>>----- Original Message ----- >>>>>>From: "Ralph E. Capen" >>>>>>To: "rv-list" ; "lycoming engine list" >>>>>> >>>>>>Sent: Monday, February 25, 2008 4:58 AM >>>>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs >>>>>> >>>>>> >>>>>>> >>>>>>> >>>>>>> Here's the setup: >>>>>>> >>>>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman >>>>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A. >>>>>>> >>>>>>> I'm planning on putting the oil cooler behind the #4 cylinder with >>>>>>> its >>>>>>> cutout for airflow feeding the oil cooler. >>>>>>> >>>>>>> My heater/mufflers require cooling air over them even when they're >>>>>>> not >>>>>>> heating the cockpit according to Larry. >>>>>>> >>>>>>> I'm thinking that taking the cooling air for both heater/mufflers >>>>>>> from >>>>>>> the >>>>>>> back plate behind the #2 cylinder should be OK - since I'm taking a >>>>>>> chunk >>>>>>> from each side. >>>>>>> >>>>>>> Is this a valid thought? - or does it not matter since I have a >>>>>>> plenum. >>>>>>> For the cabin heat air, would it be better to take the air from the >>>>>>> vertical plate or the 40 degree angled plate below it? >>>>>>> >>>>>>> Thanks, >>>>>>> Ralph >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> >>> >>> >>> >> >> >> >> >> >> > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lycomingengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/LycomingEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lycomingengines-list Browse Digests http://www.matronics.com/digest/lycomingengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.