Author Topic: Jabiru 3300 engine conversion - COST  (Read 700 times)

Bil438

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Jabiru 3300 engine conversion - COST
« on: Jul 28, 2017 »
I started a J3300 conversion in 2012. More or less done today as the cowlings are on.
The engine was used but I overhauled it. It was in a basket which cost me say $7000. There's another $5000 in direct costs and say $5000 more in tooling and other related costs. 2 new Bigger batteries are a good example. An engine stand is also a necessary cost. I was able to run the engine on that stand close to idle. Building a new lower cowl from a homemade mold  took most of a year. The resin is epoxy so the work continued through the winter of 2013. So 17,000.
How many hours? It seems like much more but my calculator say 1000 hours. I say I worked on 4 hours every work say for 4 of 5 years. And many weekends too.
Would I do it again? I'll tell you after I fly it. One of the local ex-pilots has volunteered to video the test flights. Bill E

wbpace

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Re: Jabiru 3300 engine conversion - COST
« Reply #1 on: Jul 28, 2017 »
That's fantastic Bill.  Now what are going to do with your newfound free time?

And post some pictures, or video if you have a YouTube or similar place to put it (with audio - I think we would also be interested in how it sounds).

O'Bill

Bil438

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Re: Jabiru 3300 engine conversion - COST
« Reply #2 on: Jul 28, 2017 »
Hey Bill
Send me a PM with your email and I'll send a few photos. Fortunately photos are not that demanding on the back. I've made mine quite sore more times than I care to remember,

I have both a Baking Deuce (see wikipedia "bakeng deuce") The black and gold one is mine now. Followed me home. Naca 1200 wing. Drive a Dodge? = Fly a Deuce.

So summer flying will be a big part of this year.

About once a month I go to the Cowboy Action Shooting. I have better credentials than most of them. Born and raised on the Great Central Plain. Should have chosen High Plains drifter for my tag. As it is Bill Waters a 19th century robber. At least one movie about him. However all my stuff is from south america and Italy.

I have a few coal fired steam locomotives you can ride on. The RR politics defeated me so I stopped.
Bill

mhflyit

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Re: Jabiru 3300 engine conversion - COST
« Reply #3 on: Aug 07, 2017 »
Best of luck Bill!
Matt

Bil438

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Re: Jabiru 3300 engine conversion - carb troubles
« Reply #4 on: Oct 22, 2017 »
I've been stalled at engine ground runs since September. The Jabiru 3300 engine ran and ran well but not above 2400 rpm. Turns out the Jabiru 94 carbs are all 40 mm carbs but even with the right jets they are not the same. The float valve seats are different. The orifice for the 2200 engines are .070" but for the 3300 engines are .081". The smaller seats are for the J2200 engines and the .081 seats for the J3300 engines. Because flow relates to area not diameter the .081" seat will allow about 123% more fuel into the carb than the .070 jet,
I'd made any number of jet changes and also removed fuel components: filter, mechanical pump, one at a time in an effort to isolate the problem. It comes down to the sarburetor.
The fuel lines are all 3/8" but line size doesn't matter if the float/seat are the fuel flow limiting components. Also having both electric and mechanical pumps is no advantage since the max pressure is 3.5 psi which is not enough to provide fuel for the 3300 for takeoff. 3.5 psi is the maximum for the Binb 94 carbs. The 3300 fuel requirement is .46 lbs of fuel per hp per hour then my engine needs 9.4 gals/hr at full throttle.
I found it really helpful to have other builders and pilots around to bounce ideas off. When you have say 4 years invested in an engine conversion and maybe $18,000 it can become hard to keep that level of commitment out of your troubleshooting.
It has also helped to have two Bing carbs of the same model. One has the economizer jets and the other one does not.
The mag drop left and right is about 25 rpm, though strictly speaking Jabiru ignition is electronic not magneto.
Hopefully today i'll get the carbs swapped again and see a big improvement in takeoff RPM. A J3300 engine wants 2750 rpm to 2900 rpm for takeoff and maybe 3300 rpm in full throttle cruise.
Bil438

Thaddeus

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Re: Jabiru 3300 engine conversion - COST
« Reply #5 on: Oct 22, 2017 »
Bill,

Can you replace those Jabiru carbs with a Marvel-Schebler?

Thaddeus
"It seems wisest to assume the worst from the beginning...and let anything better come as a surprise.” 
― Jules Verne, The Mysterious Island

Bil438

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Re: Jabiru 3300 engine conversion - COST
« Reply #6 on: Oct 23, 2017 »
Yes I could do that though they are large. Could also go to an Aeroinjector carb from Sonex for about the same money $600.
I won't fly without a pump so I'd need to add a .5 psi pressure regulator for the aeroinjector. One of my friends has one in the homebuilt he built. I think it's a Sonex. He loves it.
FWIW I saw a detailed article on the Pogue Carb years ago. Someone had written it was a myth, so his Union published it and sent it out in their newsletter.
From the photo the aeroinjector seems to be very close to the Pogue though Sonex deny it.
Bill438

 

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