Good Afternoon Everyone,
I am working through the Jab FWF manual and am on the section to secure the intercylinder baffles on the bottom side. The FWF manual says they are included with the engine but I purchased mine used and they were not included. Would someone be able to share a picture (better than what’s in the manual of theirs? Additionally are their two on each side or only one baffle on each side? Thanks in advance!
Badger,
I fabricated mine out of .025” aluminum. Fastened between the cylinders with a .125” aluminum rod and safety wire. Attached pictures should help. I was struggling with my CHT’s and these baffles definitely helped.
Bill
N67WX
Thanks for sharing, Bill! Just to clarify, you have them in both gaps on each side, correct?
If a used engine, and you are referring to baffles for Jabiru 330 gen 3 or earlier, or a CAMit, I have a drawing of the last ones I made and which seemed to work best, but do not see how to attach to this reply ???
David A.
Hi David, I would appreciate those! I have a late gen 3.
You can upload documents or pictures by using this button or simply dragging content to the text box:
Thanks, the drawing is below. May require minor tweak as these were used on my CAMit engine.
Curved Inter Cyl Baffles.pdf (34.0 KB)
Also strongly recommend anyone using a Jabiru or CAMit engine in there Sonex to log onto the Jab-CAMit forum. Much good info there. under files section you will find the first group of files: 3300 in a Sonex which shows most all of the modifications and adaptions I made for mine. main@JabCamit.groups.io | Home
David A.
Thanks for sharing your remarquable work on cooling the cylinders of the 3300… Difficult task!
Yes - I installed 2 baffles on the co-pilot side. (Cylinders 1, 3 & 5). The baffles were not needed for cylinders 2, 4 & 6 - those temps were already good. I believe that the abrupt inlet in the air duct for cylinders 1, 3 & 5 disrupts the airflow - making them harder to cool. I now have all my CHT’s within 50 degrees F (225 - 275) under all conditions.
Bill
Jabiru 3300
The between cylinder baffles have nothing to do with CHTs. They are to circulate air around the thin steel cylinders. Being both thin and steel, they do not conduct heat nearly as well as aluminum, and thus hot spots can develop, where oil will breakdown and cause increased wear. This was dramatically pointed out when CAMit used an alloy steel ring on there first engines (mine was #4) that had worked well on motor cycle engines and in CAMit’s test stand which had very good cooling. In real world, the cylinders quickly scored within a few hours, and not just mine. I sent one of my scored cylinders to Total Seal here in the us that had supplied those rings and their analysis was that oil was breaking down in hots spots. CAMit switched back to the iron rings which are less apt to score cylinders even when oil breaks down.
David A.
David-A,
I would have to disagree with you.
I saw a significant improvement in my CHT’s by installing the baffles. Anytime you can improve the airflow, forcing the cooling air through the fins - rather than missing the fins all together, it is certain to improve CHT’s.
Bill
N67WX
I’m not a Jabiru guy, but I do have inter-cylinder baffles on both my head and the barrels. One thing I didn’t like about the stock setup is it seemed that air could flow way too freely through the barrels without doing a lot of good. The baffles in question definitely make the air do useful work on the barrels by passing over the fins, and because the flow is choked down a little more air will go through the more critical head cooling fins.
