Lightning-List Digest Archive

Sun 06/10/12


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 02:01 AM - Re: 3300 Jab engine (Bruce & Colleen Keen)
 
 
 


Message 1


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    Time: 02:01:32 AM PST US
    From: "Bruce & Colleen Keen" <landonp@bigpond.com>
    Subject: Re: 3300 Jab engine
    Hi Mark When question was asked initially, I related back what I know about LCH and My decision to use. I point out additional information : My jabiru 3300 Engine is New (never used) but an original Built unit (No 117). Back when it was manufactured (jabiru early days) there were Head and CHT issues Well known in Australia. I have seen the results of Overheated cylinder Heads on these Early engines in early Jabiru's. Following Model upgrades, have improved Head Cooling, and as you point out Not Now an issue, If Installation Design is correct. Is it Necessary ? in my case Yes. To purchase a complete set of Later model Heads (more cooling fins etc, etc) and later model associated parts along with Jabiru directives, would have been Expensive. I chose to go with Rotec LCHs. As I believe the later, Lightning Engine mounts, were moved forward to improve CofG, my Earlier built aircraft should benefit with additional LCH fluid weight.(2lb).Another reason for My choice. I have collegues who fly considerable amounts of Hrs behind all models of Jabiru Engines and now review Current Models as sound/ reliable Power to Weight units when used as per Jabiru directions. On another Note with Jabiru 3300 Engines here, is the fitting of three blade adjustable Petroni Propellors.A considerable performance increase is being seen (takeoff and Cruise) along with smoother eng operation. Regards Bruce ----- Original Message ----- From: "Mark Stauffer" <mark@flylightning.net> Sent: Thursday, June 07, 2012 3:29 AM Subject: RE: Lightning-List: 3300 Jab engine > <mark@flylightning.net> > > I would like to weigh in on this for a moment. I am the Production Manager > for Arion Aircraft and Jabiru USA and I have well over 200 hours in over a > dozen different customer and factory built Lightning's and a handful of > Jabiru J-230's. I also have a Jabiru 3300 in my Zenith 601XL. I can > honestly > state that I have not experienced an overheating issue with these aircraft > and do not see any reason to install another system that will cost several > more thousand dollars, add more weight and add another point of failure. > > We have hot days in Tennessee as well with temperatures in the mid 90's > (35 > C). In my operation of these aircraft "IF" I see a CHT in the 350 degree > range I simply lower the nose and reduce my rate of climb a bit (from say > 1000 fpm to 800 fpm in the Lightning). Please note that the Jabiru manual > allows operation at a temperature of 392 (200 C) for up to five minutes > and > the maximum cruise CHT allowed is 356 (180 C). Why do I lower the nose in > the 360 degree range with the Jabiru? I guess it's from old habits with > the > old solid lifter engine that had a max CHT of 352. This is also the same > way > I used to fly my Cherokee with a Lycoming O-320/160 and how I was taught > flying C-172, if the CHT got warm on climb out then I lowered the nose. In > cruise the highest CHT is usually in the very low 300's such as 305 - 310. > > I stand by the statement that if the Jabiru engine is installed in a > properly designed firewall forward package (such as the Lightning) you > will > not see an overheating problem thus negating the need for an expensive > solution looking for a problem. > > How many Jabiru engines with Rotech LCH have reached 1000 hours to date? > How > many have reached 2000 hours? How can a company make a claim of their > product ensuring the engine reaches TBO when they haven't even seen it for > themselves! After 12 years of selling engines in the US, Jabiru USA is > just > now starting to see some 1000 hour top overhauls. It's taken 12 years to > get > to this point. It takes 125 days running an engine 8 hours a day to reach > 1000 hours. Has Rotech done this? Also, I am certain I can pull apart a > Jabiru engine in a Lightning that is "approaching 80 hours" and find no > wear > as well. > > I'm sure the Rotech LCH does reduce the CHT as they claim but the big > question is "is it necessary". In the Lightning, it is an emphatic NO. > > I have close to a dozen Lightning owners in Florida and a few in the > Arizona > area, both of which can get pretty hot. I hope they will add their candid > comments about their real world experiences to this discussion. > > Best regards, > > Mark > > Mark Stauffer > Production Manager > Arion Aircraft, LLC > Jabiru USA, LLC > 2842 Highway 231 North > Shelbyville, TN 37160 > (931) 680-1781 > > >




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