Wondering if anyone who owns a Jabiru Gen 4 would share their opinion/performance on the newest engine.



Views: 5304

Reply to This

Replies to This Discussion

Hi Larry!

As I recall, not too long ago I read somewhere that Jabiru NA (now Arion Aircraft) was just starting to get deliveries of 4th Generation engines. Builders are notorious for ordering their engines way too early and it just sits there awaiting completion of the airframe! Ha!

Therefore, I suspect there are few, if any, actually flying in Zenith aircraft at the moment.  However, maybe someone bought one for a swap-out with their earlier generation 3300 and in that case, could be flying it relatively quickly.  Although my 3300 is at about 550 hrs and running great, I'm interested to see how the new engine's field experience turns out.  Hopefully we'll get some reports soon!



I haven't much to offer. A friend here has just repowered his Sonex with the latest 3300. He reports the engine is smoother than his VW turbo, and it performs very nicely. He prefers the Sonex carb and replaced the Bing with one at installation. Amazingly, he finds the CHT and EGT are nearly flat across the board, a situation I've read is not common with the Bing. With about 10 hr on his, he's a very happy owner so far.

I recently flew a RANS S-19 with an older 3300 in it. I didn't feel it was any smoother than a 912S in an S-20 I flew months before, but they are much different airframes.


Amazingly, he finds the CHT and EGT are nearly flat across the board, a situation I've read is not common with the Bing.

I put a Sonex/AeroConversion "AeroInjector" carb on my 3rd Generation/"late hydraulic lifter" 3300 and had the same experience: my CHT/EGT's are much better balanced than with the Bing (saves a lot of weight, too!). Although it was immediately better, I did, however, do some tweaking and tuning and improved the balance even more, but I like doing that sort of thing!

I recently flew a RANS S-19 with an older 3300 in it. I didn't feel it was any smoother than a 912S in an S-20 I flew months before, but they are much different airframes.

I did a Dyna-Vibe engine/prop balance on my 3300/Sensenich CF GA prop/STOL 750.  I was talking to the Dyna-Vibe rep at AirVenture last week - the goal is to obtain at least .07 ips balance.  Mine balanced to .03 ips!  He said, "You can't do any better than that!"  It's smooth!


Hey John

I was just wondering what people think about the Gen 4 who owns them. I HAD a gen 2 with 259 hrs when I sold my 750 Stol to the wind and had very minor problems, but it never let me down. Jabiru engines keeps running until it runs out of fuel or oil.....magneto power.

Went to Mexico last weekend to check out their Cruzer, considering a Gen 4 because the Ul350is is WAY TOO dependent with electronics for the engine...but that's just me.


I'm not sure what the precise definition of the generations are ... I guess mine is "3rd Generation" because it is a "late hydraulic lifter" engine with external oil lines deleted that allowed for more cylinder fin area for better cooling.  As far as I know, about the only major improvements after my engine prior to the "4th Generation" was the addition of a roller cam and recessed pockets in the pistons to avoid a valve striking the piston if it stuck.  The engine itself has been very reliable for 550 hrs, but I've had to replace a couple of VDO oil pressure sensors (I'm going to try one of the solid-state sensors next time - supposedly they never wear out!) and a couple of starter Bendix clutches.  The last starter clutch was a genuine Honda part (the original and second were copies of the Honda design) and  so far it has worked longer than the previous two - fingers crossed!

I agree that I'm dubious of aircraft engines that are electrically dependent for the CPU's and fuel injection.  With mags, at least you know that once you get the engine started, it's going to keep running as long as there is fuel in the tanks!



Jabiru Engine Generation chart by Serial #


Thanks for the information, Larry!  That's the first time I've seen an actual definition of the "generations."  My serial # is 2427, so it appears I actually have a later Generation 2 engine rather than a Generation 3.  Funny thing, though, the Gen 2 includes all hydraulic lifter engines up to the roller cam Gen 3 engines.  It's well known that the early hydraulic lifter engines had some reliability problems that resolved with the later hydraulic lifter engine like I have.  Also, later in the Gen 2 series, the external oil lines were deleted and replaced with hollow push rods for oil circulation.  Deletion of the external oil lines allowed for further increasing the cylinder head fin area which enhances cooling.

With all the changes within Gen 2, looks like it should be sub-divided into Gen 2-A and Gen 2-B (or at least "early" and "late" Gen 2) so when discussing these engines, one is not comparing apples-and-oranges!

Thanks again,



New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2021   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service