---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Sun 04/10/11: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:58 AM - New Intake manifold, 2200 with TBI (Lynn Matteson) 2. 12:12 PM - Re: New Intake manifold, 2200 with TBI (Lynn Matteson) 3. 01:02 PM - Re: New Intake manifold, 2200 with TBI (Martin Hone) 4. 02:14 PM - Re: New Intake manifold, 2200 with TBI (Lynn Matteson) 5. 03:02 PM - Re: New Intake manifold, 2200 with TBI (Martin Hone) ________________________________ Message 1 _____________________________________ Time: 03:58:29 AM PST US From: Lynn Matteson Subject: JabiruEngine-List: New Intake manifold, 2200 with TBI Last week I finished the building/installation of another version of intake manifold for my 2200 engine. Weather had kept me from flying it too much until yesterday, but I saw pretty dramatic results for all the work. Previously, I was concerned about a consistent 100-120 degree F. "EGT spread" as it is displayed on my Grand Rapids EIS. As a result of making the intake runner tubes longer, and bell-mouthing the ends, the spread was reduced from that 100-120 F., down to about 30 degrees F. Yesterday I saw the spread come as narrow as...drum roll....2 degrees F. Yes, two degrees Fahrenheit. This was not a fluke reading, either, as I watched it go from about 30 down to 12, to single digits, and it finally stopped at 2 degrees, and then began climbing back up to about 30. I was running along at about 2970 rpm, 3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's were in the 1324-1357 F area. So far, I'm pretty happy with it. Now I'd like to monitor the engine for "EGT wander" as I call it....max EGT that goes from one cylinder to another cylinder. There's not much that can be done to avoid this, I don't think, but it might be worth knowing when it occurs, like during mixture change, or rpm change, etc. Lynn Matteson Kitfox IV Speedster, taildragger Jabiru 2200, #2062 Prince prop (64 x 30, P-tip) Electroair direct-fire ignition system Rotec TBI-40 injection (sleeved to 35mm) Status: flying...1094 hrs (since 3-27-2006) do not archive ________________________________ Message 2 _____________________________________ Time: 12:12:11 PM PST US From: Lynn Matteson Subject: Re: JabiruEngine-List: New Intake manifold, 2200 with TBI I just flew my plane again (to answer a question from the Yahoo group regarding the EGT spread at WOT) and here's what I found: I just flew, and the WOT (flowing 6.0 gph) EGT spread was 140-155 F., but as soon as I lower the rpm, it drops to double digits.....mostly staying in the 30-60 degree range over a range in rpm of 2700 to 3100. I again saw the EGT spread hit single digits briefly, then go to the 30's for the rest of the time I had the EGT sp. page up. What I really like is to see the EGT spread lower than the CHT spread! While this may not be a big deal to some of the guys who don't care about EGT's, it IS a big deal to me, because it shows that making a different manifold WILL make this engine breathe properly. And for once, the EGT's match the CHT's, cylinder for cylinder...that is, the high EGT is associated with the high CHT, and the low with the low, and in every case in between. The engine is also louder, indicating to me that more horsepower is being produced....a very unscientific observation, of course. : ) An interesting side note: When I had the rpm down to 27xx (slow cruise), the fuel flow was 2.7 gph. When I raised the rpm to 28xx, the fuel flow was 2.8 gph....it was almost like having a second tach, as I could almost guess the rpm I was at by moving the decimal point over three places on the fuel flow meter. This worked until I got over 3000 rpm, and then the meter showed 3.2, 3.3, 3.4 and up to 4.0, depending on the rpm, up to about 3250 where I quit comparing. Lynn Matteson Kitfox IV Speedster, taildragger Jabiru 2200, #2062 Prince prop (64 x 30, P-tip) Electroair direct-fire ignition system Rotec TBI-40 injection (sleeved to 35mm) Status: flying...1095 hrs (since 3-27-2006) On Apr 10, 2011, at 6:55 AM, Lynn Matteson wrote: > > > Last week I finished the building/installation of another version > of intake manifold for my 2200 engine. Weather had kept me from > flying it too much until yesterday, but I saw pretty dramatic > results for all the work. Previously, I was concerned about a > consistent 100-120 degree F. "EGT spread" as it is displayed on my > Grand Rapids EIS. As a result of making the intake runner tubes > longer, and bell-mouthing the ends, the spread was reduced from > that 100-120 F., down to about 30 degrees F. Yesterday I saw the > spread come as narrow as...drum roll....2 degrees F. Yes, two > degrees Fahrenheit. This was not a fluke reading, either, as I > watched it go from about 30 down to 12, to single digits, and it > finally stopped at 2 degrees, and then began climbing back up to > about 30. I was running along at about 2970 rpm, 3.3 gallons per > hour, with CHT's reading 264-296 F., and the EGT's were in the > 1324-1357 F area. So far, I'm pretty happy with it. > > Now I'd like to monitor the engine for "EGT wander" as I call > it....max EGT that goes from one cylinder to another cylinder. > There's not much that can be done to avoid this, I don't think, but > it might be worth knowing when it occurs, like during mixture > change, or rpm change, etc. > > > Lynn Matteson > Kitfox IV Speedster, taildragger > Jabiru 2200, #2062 > Prince prop (64 x 30, P-tip) > Electroair direct-fire ignition system > Rotec TBI-40 injection (sleeved to 35mm) > Status: flying...1094 hrs (since 3-27-2006) > do not archive > > ________________________________ Message 3 _____________________________________ Time: 01:02:16 PM PST US Subject: Re: JabiruEngine-List: New Intake manifold, 2200 with TBI From: Martin Hone G'day Lynn, That's certainly encouraging news ! Cheers Martin On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson wrote: > > Last week I finished the building/installation of another version of intake > manifold for my 2200 engine. Weather had kept me from flying it too much > until yesterday, but I saw pretty dramatic results for all the work. > Previously, I was concerned about a consistent 100-120 degree F. "EGT > spread" as it is displayed on my Grand Rapids EIS. As a result of making the > intake runner tubes longer, and bell-mouthing the ends, the spread was > reduced from that 100-120 F., down to about 30 degrees F. Yesterday I saw > the spread come as narrow as...drum roll....2 degrees F. Yes, two degrees > Fahrenheit. This was not a fluke reading, either, as I watched it go from > about 30 down to 12, to single digits, and it finally stopped at 2 degrees, > and then began climbing back up to about 30. I was running along at about > 2970 rpm, 3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's > were in the 1324-1357 F area. So far, I'm pretty happy with it. > > Now I'd like to monitor the engine for "EGT wander" as I call it....max EGT > that goes from one cylinder to another cylinder. There's not much that can > be done to avoid this, I don't think, but it might be worth knowing when it > occurs, like during mixture change, or rpm change, etc. > > > Lynn Matteson > Kitfox IV Speedster, taildragger > Jabiru 2200, #2062 > Prince prop (64 x 30, P-tip) > Electroair direct-fire ignition system > Rotec TBI-40 injection (sleeved to 35mm) > Status: flying...1094 hrs (since 3-27-2006) > do not archive > > ________________________________ Message 4 _____________________________________ Time: 02:14:12 PM PST US From: Lynn Matteson Subject: Re: JabiruEngine-List: New Intake manifold, 2200 with TBI G'day, Martin....I took some of your (and Jim's) advice on the manifold size, but in making the plenum large enough to not impede flow, it became about 58% of the engine size, while my old (homemade) one was 28%. The largeness doesn't *seem* to hurt anything, but I thought at first it was hindering throttle response. However, I'd like to reduce the size of the plenum just to see what would happen to all the numbers. Right now, I'm pretty happy with the results, but tomorrow I might want to tweak it some more just for grins. : ) Lynn On Apr 10, 2011, at 3:59 PM, Martin Hone wrote: > G'day Lynn, > > That's certainly encouraging news ! > > Cheers > > Martin > > On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson > wrote: > > > Last week I finished the building/installation of another version > of intake manifold for my 2200 engine. Weather had kept me from > flying it too much until yesterday, but I saw pretty dramatic > results for all the work. Previously, I was concerned about a > consistent 100-120 degree F. "EGT spread" as it is displayed on my > Grand Rapids EIS. As a result of making the intake runner tubes > longer, and bell-mouthing the ends, the spread was reduced from > that 100-120 F., down to about 30 degrees F. Yesterday I saw the > spread come as narrow as...drum roll....2 degrees F. Yes, two > degrees Fahrenheit. This was not a fluke reading, either, as I > watched it go from about 30 down to 12, to single digits, and it > finally stopped at 2 degrees, and then began climbing back up to > about 30. I was running along at about 2970 rpm, 3.3 gallons per > hour, with CHT's reading 264-296 F., and the EGT's were in the > 1324-1357 F area. So far, I'm pretty happy with it. > > Now I'd like to monitor the engine for "EGT wander" as I call > it....max EGT that goes from one cylinder to another cylinder. > There's not much that can be done to avoid this, I don't think, but > it might be worth knowing when it occurs, like during mixture > change, or rpm change, etc. > > > Lynn Matteson > Kitfox IV Speedster, taildragger > Jabiru 2200, #2062 > Prince prop (64 x 30, P-tip) > Electroair direct-fire ignition system > Rotec TBI-40 injection (sleeved to 35mm) > Status: flying...1094 hrs (since 3-27-2006) > do not archive > > > ========== > -List" target="_blank">http://www.matronics.com/Navigator? > JabiruEngine-List > ========== > http://forums.matronics.com > ========== > le, List Admin. > ="_blank">http://www.matronics.com/contribution > ========== > > > www.matronics.com/contribution _- > =========================================================== ________________________________ Message 5 _____________________________________ Time: 03:02:29 PM PST US Subject: Re: JabiruEngine-List: New Intake manifold, 2200 with TBI From: Martin Hone Lynn, you are a born tinkerer ! Cheers Martin On Mon, Apr 11, 2011 at 7:11 AM, Lynn Matteson wrote: > > G'day, Martin....I took some of your (and Jim's) advice on the manifold > size, but in making the plenum large enough to not impede flow, it became > about 58% of the engine size, while my old (homemade) one was 28%. The > largeness doesn't *seem* to hurt anything, but I thought at first it was > hindering throttle response. However, I'd like to reduce the size of the > plenum just to see what would happen to all the numbers. Right now, I'm > pretty happy with the results, but tomorrow I might want to tweak it some > more just for grins. : ) > > Lynn > > > On Apr 10, 2011, at 3:59 PM, Martin Hone wrote: > > G'day Lynn, >> >> That's certainly encouraging news ! >> >> Cheers >> >> Martin >> >> On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson wrote: >> >> Last week I finished the building/installation of another version of >> intake manifold for my 2200 engine. Weather had kept me from flying it too >> much until yesterday, but I saw pretty dramatic results for all the work. >> Previously, I was concerned about a consistent 100-120 degree F. "EGT >> spread" as it is displayed on my Grand Rapids EIS. As a result of making the >> intake runner tubes longer, and bell-mouthing the ends, the spread was >> reduced from that 100-120 F., down to about 30 degrees F. Yesterday I saw >> the spread come as narrow as...drum roll....2 degrees F. Yes, two degrees >> Fahrenheit. This was not a fluke reading, either, as I watched it go from >> about 30 down to 12, to single digits, and it finally stopped at 2 degrees, >> and then began climbing back up to about 30. I was running along at about >> 2970 rpm, 3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's >> were in the 1324-1357 F area. So far, I'm pretty happy with it. >> >> Now I'd like to monitor the engine for "EGT wander" as I call it....max >> EGT that goes from one cylinder to another cylinder. There's not much that >> can be done to avoid this, I don't think, but it might be worth knowing when >> it occurs, like during mixture change, or rpm change, etc. >> >> >> Lynn Matteson >> Kitfox IV Speedster, taildragger >> Jabiru 2200, #2062 >> Prince prop (64 x 30, P-tip) >> Electroair direct-fire ignition system >> Rotec TBI-40 injection (sleeved to 35mm) >> Status: flying...1094 hrs (since 3-27-2006) >> do not archive >> >> >> >> >> >> >> ========== >> -List" target="_blank"> >> http://www.matronics.com/Navigator?JabiruEngine-List >> ========== >> http://forums.matronics.com >> ========== >> le, List Admin. >> ="_blank">http://www.matronics.com/contribution >> ========== >> >> >> >> >> > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.