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1. 04:50 AM - Re: JabiruEngine-List Digest: 4 Msgs - 02/12/10 (John Lawton)
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| Subject: | Re: JabiruEngine-List Digest: 4 Msgs - 02/12/10 |
On Sat, Feb 13, 2010 at 2:58 AM, JabiruEngine-List Digest Server <
jabiruengine-list@matronics.com> wrote:
> *
>
>
> Time: 10:07:40 AM PST US
> From: Robert Rivard <bw12345@sbcglobal.net>
> Subject: JabiruEngine-List: 2200 timing
>
> I have been going through the Maintenance CD trying to find out how to
> check timing.
> It mentioned 23 degrees BTDC on number one on assembly. Said to align
> timing
> marks. Is this engine static timed only?Would someone please elaborate on
> this procedure.
> I do not get full rpm's and have a high egt. Would like to check timing and
> rule
> out that it is not retarded,which would cause both these conditions.
>
> BOB
>
> Hey Bob,
As others have said your problem is more likely carb jetting. Prop pitch
(engine loading) and airframe drag (or lack thereof) also affects mixture
and therefore EGT's. Jabiru engines come from the factory tuned for their
airframe. So, you have to adjust the prop pitch or choose a prop with the
correct pitch to properly load the engine. You must also choose carb jetting
to suite your particular airframe and prop combination. The gist of it is a
clean airframe presents less load to the engine and the result is a leaner
running engine. An airframe with more drag results in a richer running
engine. Same thing with prop pitch. More pitch makes the engine work harder,
richening the mixture. With less prop pitch the engine doesn't work as hard
and the result is leaning. This was covered in depth at the Jabiru Seminar
put on by Jabiru USA. I highly recomend attending their seminar if you can.
The wealth of information they provide about the engine and Bing carby is
well worth the price charged.
Try giving Pete at Jabiru USA a call. Chances are he's already seen your
combination and can "cut to the chase" with suggestions on how to get you
back to where you need to be.
Hope it helps!
Regards,
John Lawton
Whitwell, TN (TN890
Europa N245E - Flying
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