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BobbyPaulk(at)comcast.net
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 Posted: Tue Jan 17, 2012 6:32 am Post subject: Engine Surges |
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Probably not any of them around any more but have you checked to see if you have the newer Black floats.
My first carb had the older white floats and would not stop the fuel flow at 2.25 psi. The engine would flood and run like a diesel with black soot in the exhaust. The new floats and needle valve solved the problem.
Jab 3300 140 hrs
Zodiac 601 XL
[quote][b]
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Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
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| Posted: Wed Mar 28, 2012 5:16 pm Post subject: Re: Engine Surges |
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Talked to Jab Aus and they cannot source the black floats anymore so back to white.After changing idle jet to 45 and freeing the balance tube blockage took the plane for a circuit and everything went well.On the second circuit pulled throttle back to 2000 rpm and it started surging again and once over the threshold back to idle stop and the fan stopped.It started straight away and I taxied back to hangar.On turning the prop at the hangar it seemed quite tight compared to pre- flight [ when it was cold] .How does your engine compare hot to cold ? Cheers Alan
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zeprep251(at)aol.com
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| Posted: Thu Mar 29, 2012 5:44 am Post subject: Engine Surges |
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Alan,
Not unusual for the engine to be tight shortly after shutdown when the cylinder temps are high.Forged pistons change dimension quite a bit with temp.They clank a bit when cold and drag some when really heat soaked after shutdown.That's one of the reasons .015 cold clearance is OK in some larger engines.This has been my experience only and is open to revision by more knowledgeable sources.
G.Aman jabiru 2200A 700hrs
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Mar 29, 2012 8:31 am Post subject: Engine Surges |
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Gary-
I don't think you'll find that the Jabiru pistons are forged.....at
least mine are not. Maybe some of them are, but mine are cast, I'm
almost 100% sure.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1242 hrs... (since 3-27-2006)
On Mar 29, 2012, at 9:43 AM, Gary Aman wrote:
| Quote: | Alan,
Not unusual for the engine to be tight shortly after shutdown when
the cylinder temps are high.Forged pistons change dimension quite a
bit with temp.They clank a bit when cold and drag some when really
heat soaked after shutdown.That's one of the reasons .015 cold
clearance is OK in some larger engines.This has been my experience
only and is open to revision by more knowledgeable sources.
G.Aman jabiru 2200A 700hrs
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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