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Jabiru ram-air ducts

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david_a_g_johnson(at)btin
Guest

Posted: Fri Feb 29, 2008 1:57 am Post subject: Jabiru ram-air ducts

I am at the point of installing the ram-air ducts  on my Jabiru 3300. The right-hand duct went on without too many problems (that  couldn't be solved with some colourful cussing!). 

 The left-hand duct is causing headaches. because of  the offset of the cylinders, the rear cylinder on the left is very close to the  engine mounting plate and I cannot see how I can get the duct in.

 On the right, the duct fits between the 5th. and  6th. fins (counting out from the crankcase). There's no way I can get the left  duct that close. The fibreglass is recessed to clear the engine mount, but only  once it is in place!

 Am I being dumb? (don't answer that!). How did  other Jab. users solve the problem?

  

 Hoping someone can help (they always have in the  past!)

  

 Dave Johnson

  

 601XL 

  

  

    [quote][b]

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Fri Feb 29, 2008 7:37 am Post subject: Re: Jabiru ram-air ducts

Dave,



I remember having to play with this left duct a little bit, but it was not a show-stopper, at least on my engine.   Once I found which fins the aft part seemed to like the best, I put a spot of magic marker on the first visible fin so I can put it back the next time.  There was no one spot that worked perfectly.  I still have to push and shove a bit.  If it was any worse, as it appears in your case, I guess I would try to heat the duct and re-form it a bit.



I do not remember if it made the Homebuilthelp.com video or not, but Mark at Jabiru USA suggested reinforcing the holes in the ducts that you will be drilling for the valve cover cap screws.  I made a piece small aluminum sheet and JB weld epoxied it in place.



I have not run yet so this is all theory to me at this point..



Good luck,

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_________________
David Gallagher
Cincinnati, OH area

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Fri Feb 29, 2008 8:10 am Post subject: Re: Jabiru ram-air ducts

Are you installing the old style or new style ducts?  New style doesn't have all the holes for the spark plug wires.



Tim



Do not archive

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

david_a_g_johnson(at)btin
Guest

Posted: Fri Feb 29, 2008 10:52 am Post subject: Jabiru ram-air ducts

Interesting question. The engine is about 6 months old (Hydraulic tappets, 

etc.), but the ducts have all the spark plug holes as they appeared on the 

Homebuilthelp video.



Dave Johnson



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