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[jabiruengines] Speaking of TBO (was12-Point Crowsfoot Ada

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don.honabach(at)pcperfect
Guest

Posted: Wed Aug 03, 2011 9:04 am Post subject: [jabiruengines] Speaking of TBO (was12-Point Crowsfoot Ada

Lynn,



I just noticed that you've done a ton of mods -- very cool!  I think there should be a new model "Lynn's Jabiru Extreme Edition" for your setup <g>!



One of the things I noticed was that you have the Rotec TBI for your engine. I just ordered mine the other day.  If you don't mind, any tips for a newb?  



Also, what was the main reason for going over to the Alectroair Ignition System?  



Looking back, if you had to do all the mods over again for the Jabiru Engine (intake manifold, ignition, carb, etc.), would you? Are there any that you consider vital?



Thanks,

Don

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Aug 03, 2011 2:46 pm Post subject: [jabiruengines] Speaking of TBO (was12-Point Crowsfoot Ada

Don-

I didn't start out wanting to make mods to the engine, but the rocker  

arm bushings wore out, so I replaced them with something that I  

thought was a better bearing for the purpose. When the crank gear  

broke, that opened the door for the ignition modification. I hadn't  

liked the pseudo-magneto that Jabiru came up with, and when I had oil  

leaks from both distributor shafts early on, and rotors that got  

wobbly (my fault for not gluing them on....what? how many engines  

require you to glue a rotor in place?), that set the stage for  

changing to a modern ignition system....capable of advancing the  

timing when necessary.



I bought the Rotec TBI because I had been reading a lot about flying  

"lean of peak EGT", and I wanted to give that theory a try. Because  

you can't do this with a Bing....that is, change the mixture on the  

fly...when I heard about the TBI that Rotec was building, I bought  

one. If you are using it on a 2200, plan on restricting the throttle  

travel, as the size of the throat...40 mm, if that's the one you  

bought...is to much for the 2200 engine. For a 3300, I understand  

that the size is just right. I restricted mine about 1/4", then later  

I thought that sleeving the throat down to 35 or 36 mm made more  

sense. (I see that Rotec is now making a 34 mm TBI for VW engines.)  

Also, once you begin to fly it, you will probably notice that the  

mixture control can be adjusted to provide a lesser-than-full  

travel...also necessary for the smaller engine.



I think that the latest intake manifold that I built improves the  

power of the engine, and gets the EGT's a bit closer....but still not  

perfect as I had hoped. But like they say, if the CHT's are close and  

low, (and mine are always less than 20 F apart, and often down to  

single digits) then the EGT spread is not that big a deal.



As long as your engine is running well, and you follow the hourly  

checks that Jab provides, and have *good luck*, none of those mods  

that I did was vital. I just saw room for improvement and I love to  

tinker, so I did what I felt had to be done.



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 36mm)

Status: flying with "Ramcharger" intake manifold...1152 hrs (since  

3-27-2006)

do not archive



On Aug 3, 2011, at 12:59 PM, Don Honabach wrote:



 	  Quote: 	
		   

 <don.honabach(at)pcperfect.com>



 Lynn,



 I just noticed that you've done a ton of mods -- very cool!  I  

 think there should be a new model "Lynn's Jabiru Extreme Edition"  

 for your setup <g>!



 One of the things I noticed was that you have the Rotec TBI for  

 your engine. I just ordered mine the other day.  If you don't mind,  

 any tips for a newb?



 Also, what was the main reason for going over to the Alectroair  

 Ignition System?



 Looking back, if you had to do all the mods over again for the  

 Jabiru Engine (intake manifold, ignition, carb, etc.), would you?  

 Are there any that you consider vital?



 Thanks,

 Don

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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