[Titanaircraft] Re: Jabiru cooling

Yes, I do run the Sensenich prop. My EGT's are low (1150-1200 if my readings are accurate) and I seem to run a bit rich. Ive tried lowering the needle a notch and it runs fine in the summer but when it turns cold (here in MN) the engine will start to hesitate when advancing the throttle (very uncomfortable sound when flying) so Ive left it running a bit rich.

Yes, the bowl vent is routed back to the air filter.

It seems to me at some point there was an update to the carb (different needle and jet) Maybe thats what I need?

--- In Titanaircraft@yahoogroups.com, "Kimberly Panos" <kimberly@...> wrote:
>
> Are you by chance running a Sensenich wood prop or not monitoring your EGT? Every Jabiru we've seen with a Sensenich wood prop is loaded too heavily with the wide blades, causing the the carb to run rich, which happens with the Bing altitude compensating carbs used on Rotax and Jabiru. We've also found that almost no one makes jetting changes to their carb after the initial engine installation. Many people also forget or don't know to route the carburetor bowl vent into the back of the air filter, which also makes the carburetor run too rich. In these cases, the rings can get carbon fowled and stick them to the piston grooves, causing a progressive loss in compression, which can cause serious losses in power in any engine. The EGT's should be upwards of 1250F at full throttle, and 1320-1350F at cruise.
>
> --Kimberly
>
>
> ----- Original Message -----
> From: trsnsk67
> To: Titanaircraft@yahoogroups.com
> Sent: Wednesday, November 11, 2009 7:51 PM
> Subject: [Titanaircraft] Jabiru cooling
>
>
>
> I have been fighting low compression in the rear two cylinders of my Jab 2200 ever since Ive been flying my Titan. Im assuming the problem is due to inadequate cooling of the rear cylinders. The cylinders are covered with the standard (I think) plenum, there is no BRS, and Im flying in MN. Im wondering if Jabiru has more than one plenum design for pusher configurations? Maybe there is just poor air flow over the wing? Anyone else have this problem?
>
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> [Non-text portions of this message have been removed]
>

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