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ptag.dev(at)tiscali.co.uk
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 Posted: Fri Apr 15, 2011 7:53 am Post subject: JABIRU 3300 BRAND NEW OVER TEMPERATURE DURING TAXI |
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Hi! Frans, Graham /all
With comments about the Jabiru you are subjecting me to a nightmare
!!!!!!!!!!!! don't tempt me !
Regards
Bob Harrison G_PTAG
| Quote: | ----Original Message----
From: grahamsingleton(at)btinternet.com
Date: 15/04/2011 11:46
To: <europa-list(at)matronics.com>
Subj: Re: Re: JABIRU 3300 BRAND
NEW OVER TEMPERATURE DURING TAXI
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| Quote: | I think you are right, much more logical conclusions than mine !
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| Quote: | Agree about the Jabiru also, sad but geared and liquid cooled will
always have a
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| Quote: | performance advantage. More complication too of course but a more
sensible
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| Quote: | compromise I think.
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| Quote: | ________________________________
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| Quote: | From: Frans Veldman <frans(at)privatepilots.nl>
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| Quote: | Sent: Friday, 15 April, 2011 11:17:12
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| Quote: | Subject: Re: Re: JABIRU 3300 BRAND NEW OVER TEMPERATURE
DURING
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| Quote: | On 04/15/2011 10:17 AM, GRAHAM SINGLETON wrote:
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| Quote: | > To a certain extent the same thing happens with Rotax so the front
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| Quote: | > cylinders get more fuel than the rear at some throttle settings,
drops
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| Quote: | > of fuel don't turn corners the same as air molecules!
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| Quote: | I believe the "problem" with the Rotax is of a different nature.
There
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| Quote: | are two carbs, and the inlet pulses are not equally distributed. Each
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| Quote: | carb will see two inlet pulses in sequence, then followed by a long
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| Quote: | pause when the cylinders on the other side (fed by the other carb)
have
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| Quote: | their respective inlet pulses.
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| Quote: | After the pause, the flow of fuel inside the nozzles is stalled. With
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| Quote: | the first cylinder breathing, the fuel has to start moving again, and
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| Quote: | the second cylinder has the benefit that the fuel is already up to
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| Quote: | speed. So the second cylinder in the sequence receives a slightly
richer
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| Quote: | A solution can be to use a bigger bore balance tube. Some Italian
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| Quote: | company is selling a pair of manifolds and balance tube for this
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| Quote: | purpose, and the manifolds have already the bosses in them to mount
fuel
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| Quote: | injectors for future upgrades (and using the carbs as fuelless
throttle
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| Quote: | bodies and backup in case the EFI fails).
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| Quote: | Ok,the subject was "Jabiru". To keep it in the subject: After the
long
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| Quote: | list of problems and disadvantages, can anybody enlighten me what the
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| Quote: | benefit is of the Jab over the Rotax? (I assume there must be one,
why
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| Quote: | else would anyone bother to install one?)
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| Quote: | Frans==================
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budyerly(at)msn.com
Guest
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| Posted: Fri Apr 15, 2011 1:52 pm Post subject: JABIRU 3300 BRAND NEW OVER TEMPERATURE DURING TAXI |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> I had thought I was the only one with sleepless nights.
Bud
[quote] ---
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