6 cylinder surprise

[Blueadventures]

Definitely a good development; however will add a little weight which may be offset by the shorter less mass of the prop flange / spacer.

[johnm]

and this ............... I assume

 

 

[onetrack]

It's incredible what the machining abilities are, of the new types of cutting tips. Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD) coatings have revolutionised machining with their ability to cut like diamond-tipped tools without the level of breakage that DTT's suffer from. Cylindrical grinders have become obsolete today, as you can now acquire tips that will machine chrome like butter.

[facthunter]

Why would a billet Crank weigh More than a forged one? I can't see why it would have to. (refering back a little way). Nev

Edited April 30 by facthunter

[Blueadventures]

24 minutes ago, facthunter said:

Why would a billet Crank weigh More than a forged one? I can't see why it would have to. (refering back a little way). Nev

If question is about my posts reference to weight it was referring to the additional material at the forward end on the case (crankcase) that would allow for more distance between the two bearing there to add better support and that would mean the prop adaptor flange and its spacing to be shortened as explained by Paul.  I reckon you would enjoy a day or two in Pauls workshop; I know I would.  Cheers.

[facthunter]

Thanks. Often cranks have sections that are much weaker than the general section and that concentrates stress in those  areas. Poor design. Usually where a throw goes to a crank pin section. Billet is not really like a bit of grained timber as some imagine if it's rolled properly.  The ends of each rolled length should be discarded if there's any chance of a Scarf being there..  Nev

[BrendAn]

1 hour ago, Blueadventures said:

If question is about my posts reference to weight it was referring to the additional material at the forward end on the case (crankcase) that would allow for more distance between the two bearing there to add better support and that would mean the prop adaptor flange and its spacing to be shortened as explained by Paul.  I reckon you would enjoy a day or two in Pauls workshop; I know I would.  Cheers.

I have been there. Great bloke's . They do some brilliant work. The radial engines are a work of art.

[BrendAn]

On 27/04/2025 at 7:20 PM, GolfWhiskeyHotel said:

I follow this forum at irregular intervals , but given the latest news re: Jabiru Gen 4 , I thought "I wonder what everybody is saying".  So I came for a look.  Now I know what everyone is saying . NOTHING.  Not one post?  But People are being told

"Your engine will require a new crankshaft" , please join the queue.  Has no-one anything to say?   I hear that 3 or 4 hundred engines are involved. Worldwide.  Seems to me to be a postworthy subject wouldn't you think?

My aircraft is not involved of course, being a J160 with 912uls engine. (coming up to its third year and MARAP yet to be completed) . Happy Hours in the sky................ Geoff

 

Edited May 2 by BrendAn

[facthunter]

Recalls and extending warrantees are a good thing. Nev

[madhatter]

I recently purchased a gen 4 3300 however it now requires a new crankshaft. The engine only has 37 hours total time. I requested an exchange engine but was turned down so it will be torn down to correct the issue, very disappointed in Jabiru over this. I will incur a lot of expense and down time because of this, if this was Lycoming, Continental,  or Rotax it would be exchanged. I can install it myself, I've been maintaining aircraft for 52 years. Even with this I am impressed with the 230D aircraft. 

On another subject: I believe the new E-PROPS propeller being developed would be a game changer on a Jabiru. I was able to perform an analysis on Flight Design with an E-PROPS propeller which resulted in it being approved for all FD aircraft in the US. The performance increase is substantial for cruise speed, rate of climb, vibration, etc. The other important aspect is it has a very low moment of inertia which is less than half of that on the fiberglass prop for the 230D. This significantly reduces the gyroscopic forces on the crankshaft. The E-PROPS propeller and spinner only weighs about 5 lbs.

If Jabiru doesn’t approve the use of it within a reasonable time I will convert to experimental and document the analysis like I did with Flight Design. 

[facthunter]

The DEAL in Australia seems a much better one, regarding the Crankshafts.  Nev

[BrendAn]

18 minutes ago, facthunter said:

The DEAL in Australia seems a much better one, regarding the Crankshafts.  Nev

Why. Jabiru are only supplying cranks. Nothing else.

[facthunter]

That's not how I read it.  The warrantees are extended for the Listed Engines.  Nev

[Red]

On 29/04/2025 at 9:50 AM, Garfly said:

I presume this is it:

 

 

Thanks, seems a very valid explanation of the root of the problem.

Do many Jabiru models require that ridiculous length of prop drive extension?

[BrendAn]

3 hours ago, facthunter said:

That's not how I read it.  The warrantees are extended for the Listed Engines.  Nev

It says no component cost to the owner. Doesn't that mean they will only supply the new crank. Owner pays the rest.

[Blueadventures]

14 minutes ago, BrendAn said:

It says no component cost to the owner. Doesn't that mean they will only supply the new crank. Owner pays the rest.

Yep, they should do exchange engines.  That would be fair and pay both freights and the removal and install cost. 

[madhatter]

Jabiru will install the crankshaft but this takes time. This is at the distributors shop. I would rather get an exchange engine and not have to deal with any possible rebuild issues later. I had a significant issue with the current engine when they installed it. 

[GolfWhiskeyHotel]

2 hours ago, Blueadventures said:

Yep, they should do exchange engines.  That would be fair and pay both freights and the removal and install cost. 

I believe they do replace your crank with a new one. But its up to you to get the engine to them. I am quite pleased with their response to a nasty problem. I have 3 customers waiting to send their engines. 

[Blueadventures]

10 minutes ago, GolfWhiskeyHotel said:

I believe they do replace your crank with a new one. But its up to you to get the engine to them. I am quite pleased with their response to a nasty problem. I have 3 customers waiting to send their engines. 

If I was affected that would not be good enough.  You should be able to drop of the plane and pickup when done.  Or if distance a problem the removal and refit etc at their expense.  Could maybe make for a class action.

[BrendAn]

32 minutes ago, GolfWhiskeyHotel said:

I believe they do replace your crank with a new one. But its up to you to get the engine to them. I am quite pleased with their response to a nasty problem. I have 3 customers waiting to send their engines. 

This is where I am confused, are they supplying the parts but charging labor or are they doing the whole job at jabs expense once they receive the engine.

 

[madhatter]

They cover everything except transportation. I suppose since they are not as large as other primary engine companies they don't have the resources to exchange engines. However I would think it to be more economical to exchange low time new engines. It would be more economical if sending engines to those who could do their own installations. 

[skippydiesel]

11 hours ago, Blueadventures said:

If I was affected that would not be good enough.  You should be able to drop of the plane and pickup when done.  Or if distance a problem the removal and refit etc at their expense.  Could maybe make for a class action.

Your expectations seem a tad high. You purchase a cheap engine, from a relativly small manufacturer and then expect big company service.

 

While I admire Jabs, my possibly erroneous, perception is they are purchased on price - Yah Gets What Youse Pays For😈

[madhatter]

My opinion on the Jabiru engine is that it is a very well designed engine. Most new engines require a lot of time to perfect them, no one is immune from it. Continental had many years of problems with the IO520, Lycoming took about 20 to 25 years to perfect the LTS 101 turbine, I was there in the beginning and saw many test cell failures, many were catastrophic, one  on my watch. Rotax and Continental both had crankshaft issues recently.

Jabiru uses some existing automotive parts wth great success. I don't think they are going cheap, just smart.

 

[BrendAn]

2 hours ago, skippydiesel said:

Your expectations seem a tad high. You purchase a cheap engine, from a relativly small manufacturer and then expect big company service.

 

While I admire Jabs, my possibly erroneous, perception is they are purchased on price - Yah Gets What Youse Pays For😈

This is from a bloke who shops at Bunnings aerospace.🤣