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AirEupora
Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA
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mau11(at)free.fr
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 Posted: Fri Jan 22, 2010 9:51 am Post subject: Wondering |
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Jabiru is not a good solution! I know many engines for sales in France replaced by Rotax. <<Reliability>>
22-01-2010
mau11
De ： AirEupora
Date/heure ： 22-01-2010 17:02:56
A ： europa-list
Cc ：
Sujet ： Wondering
--> Europa-List message posted by: "AirEupora" <AirEupora(at)sbcglobal.net>
if anybody has flown with this combination:
Jabiru 3300 engine, Whirlwind prop 65", straight exhaust pipes?
If so what was your performance figures? Is there anything I should watch out for?
Rick Stockton
waiting for engine
[Question]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 82889#282889
[quote][b]
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fklein(at)orcasonline.com
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| Posted: Fri Jan 22, 2010 11:05 am Post subject: Wondering |
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John Lawton w/ trigear XS is very pleased w/ his Jab...uses Sensenich FP prop...I believe he has straight pipes...
Fred
A194
do not archive
On Jan 22, 2010, at 8:30 AM, mau11 wrote:
| Quote: | Jabiru is not a good solution! I know many engines for sales in France replaced by Rotax. <<Reliability>>
22-01-2010
mau11
De ： AirEupora
Date/heure ： 22-01-2010 17:02:56
A ： europa-list
Cc ：
Sujet ： Wondering
style="color: blue; text-decoration: underline; ">http://www.matronics.com/Navigator?Europa-List blue; text-decoration: underline; ">http://forums.matronics.com style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution [/b] |
[/quote]
[quote][b]
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jimpuglise(at)comcast.net
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| Posted: Fri Jan 22, 2010 2:15 pm Post subject: Wondering |
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EGT and CHT are all you will need to be careful of. I am in the middle of installing a 3300 in mine; am going the Sensenitch prop as John has. One of the secrets seems to be the amount of twist in the prop near the hub, so that it throws a lot of air into the cooling ports. This is why the Senesenitch is recommended. I don't know anything about the Whirlwind. Ther are several Jabs. flying in the US with excellent performance. Many of the problems have been in monos or with VP props.
Jim Puglise A-283.
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grahamsingleton(at)btinte
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| Posted: Fri Jan 22, 2010 5:28 pm Post subject: Wondering |
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On 22/01/2010 22:11, jimpuglise(at)comcast.net (jimpuglise(at)comcast.net) wrote: | Quote: | p { margin: 0; }
EGT and CHT are all you will need to be careful of. I am in the middle of installing a 3300 in mine; am going the Sensenitch prop as John has. One of the secrets seems to be the amount of twist in the prop near the hub, so that it throws a lot of air into the cooling ports. This is why the Senesenitch is recommended. I don't know anything about the Whirlwind. Ther are several Jabs. flying in the US with excellent performance. Many of the problems have been in monos or with VP props.
Jim Puglise A-283.
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Carburation affects cooling. The carb needs air going straight in evenly, a smooth elbow into the carb doesn't work, different air velocity across the inlet which causes different mixture in the front and rear cylinders, (I'm thinking aloud here) could be that turbulent flow is needed. A plenum that feds straight not curved seems to work better. A box with in and out tubes (at)90deg works. Turbulence might help evaporate the fuel droplets spraying into the inlet manifolds. Drops won't go round corners.
There's a guy in UK who worked this out, Anthony Higgins but I don't have his contact details, ((at)#%$^&windoze crash  Rally driver and Europa builder. Are you there Tony?
Tony helped cure an overheating Jab 6, I spent hours on it and failed.
Which reminds me, I recommend you fit a fuel bleed back downstream of th engine driven pump. Pump is bolted to the engine and will get hot, fuel vaporisation is a possibility. One accident due to this suspected, not yet proven. Fuel was Avgas.
Graham
[quote][b]
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jimpuglise(at)comcast.net
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| Posted: Fri Jan 22, 2010 6:45 pm Post subject: Wondering |
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Graham-
I have been talking with the Jab. people in Tenn. as I go throught it and I purchased one of the little 30 degree elbows from them. Jab. also recommends thoroughly smoothing the area around the 2 1/4 inch tube leading out of the airbox and I have done so. This would all seem to support a smooth flow, but at this point I know nothing, since it is not yet running. As an initial shot, I am going 100% with the Jab. recommendations, then we will see. Their feeling is that cooling will be OK. The more recent engines (mine being one) have larger fins on 5 and 6, and they say this helps. Also, on the tri-gear, there is an easier exit for cooling air, and that supposedly helps too. I have individual EGT probes on each cylinder, so will be able to watch it. Also, they say that the baffles you can install in the cooling shrouds can be tuned to get it just right. As I say, I have no way of knowing if any on this is correct. Talk to me in about 3 months.
You can also install pipes off the cooling shroud pointed at components you wish to cool, and I may find it necessary to do that with the fuel pump.
Jim
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