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jonboede(at)hotmail.com
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 Posted: Sun Jan 17, 2010 6:33 pm Post subject: husoi "surging" |
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My friend said that his CJ is experiencing "surging" on take-off C really any time when he applies full throttle.
Says that is not seeing a wiggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather here was 60+ degrees with very low humidity. Any ideas what might be causing that??
Jon
[quote][b]
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kingcj6(at)aol.com
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| Posted: Sun Jan 17, 2010 6:41 pm Post subject: husoi "surging" |
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Are the intake drain plugs all secure? Is the primer down & locked?
In a message dated 1/17/2010 6:35:27 P.M. Pacific Standard Time, jonboede(at)hotmail.com writes:
| Quote: | My friend said that his CJ is experiencing "surging" on take-off, really any time when he applies full throttle.
Says that is not seeing a wiggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather here was 60+ degrees with very low humidity. Any ideas what might be causing that??
Jon
|
[quote][b]
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dsavarese0812(at)bellsout
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| Posted: Sun Jan 17, 2010 6:48 pm Post subject: husoi "surging" |
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Many times surging at high RPM (WOT) is also caused by an inadequate supply of fuel. Check the fuel screens as well as the finger screen in the carburetor for any foreign matter. Also a "flapper" in a flexible fuel hose can cause a partial blockage, particularly under higher fuel demands ie: WOT.
In addition to the intake drains being secure and the primer pump locked in the center position, it also could be related to loose intake gland nuts. Also a common problem. Tighten all the intake gland nuts because a loose intake gland nut will cause a cylinder to run lean.
Dennis
[quote] ---
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Jan 17, 2010 6:48 pm Post subject: husoi "surging" |
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I had just such a problem in my Yak-52. It was just that way... on takeoff, maybe 3/4 through the ground roll, a pronounced surging (and a fuel pressure drop to approx. .2).... which you could smooth out by retarding the throttle. After checking a lot of other things (governor, fuel vents, etc...), it turned out to be an obstruction (hose flapper) in the hose between the fine fuel strainer and the carb.
-Eric
On Jan 17, 2010, at 9:32 PM, Jon Boede wrote:
| Quote: | My friend said that his CJ is experiencing "surging" on take-off, really any time when he applies full throttle.
Says that is not seeing a wiggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather here was 60+ degrees with very low humidity. Any ideas what might be causing that??
Jon
| Quote: |
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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rick(at)rvairshows.com
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| Posted: Sun Jan 17, 2010 6:53 pm Post subject: husoi "surging" |
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Maybe a flapper in a fuel line. Easy to check.Rick Volker
Sent from my Verizon Wireless BlackBerryFrom: Jon Boede <jonboede(at)hotmail.com>
Date: Sun, 17 Jan 2010 20:32:06 -0600
To: <yak-list(at)matronics.com>
Subject: Yak-List: husoi "surging"
My friend said that his CJ is experiencing "surging" on take-off=2C really = any time when he applies full throttle.
Says that is not seeing a wi= ggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather her= e was 60+ degrees with very low humidity. =3B Any ideas what might be c= ausing that??
Jon
= [quote][b]
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dsavarese0812(at)bellsout
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| Posted: Sun Jan 17, 2010 6:57 pm Post subject: husoi "surging" |
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The CJ does not have the same "fine" fuel screen/filter as the Yak 52 does. It has the same type of "coarse" fuel screen/filter the 52 has though. The fuel hose Eric refers to would the fuel hose going into the base of the carburetor on the Housai.
Dennis
[quote] ---
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Jan 17, 2010 6:59 pm Post subject: husoi "surging" |
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Rick says this because he said "hose flapper" and I checked everything else before finding out he was right. Lucky guess.
On Jan 17, 2010, at 9:54 PM, rick(at)rvairshows.com (rick(at)rvairshows.com) wrote:
[quote]Maybe a flapper in a fuel line. Easy to check.
Rick Volker
Sent from my Verizon Wireless BlackBerryFrom: Jon Boede <jonboede(at)hotmail.com (jonboede(at)hotmail.com)>
Date: Sun, 17 Jan 2010 20:32:06 -0600
To: <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Subject: husoi "surging"
My friend said that his CJ is experiencing "surging" on take-off=2C really = any time when he applies full throttle.
Says that is not seeing a wi= ggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather her= e was 60+ degrees with very low humidity. =3B Any ideas what might be c= ausing that??
Jon
= | Quote: |
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
href="3D"http://www.matronics.com/Navigator?Yak-List"">http://www.matronics.com/Navigator?Yak-List
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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viperdoc(at)mindspring.co
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| Posted: Sun Jan 17, 2010 7:18 pm Post subject: husoi "surging" |
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Eric is on the money. Had the same thing but could not locate the problem until the engine quit 50 of the runway at full throttle. Landed safely. Pulled the finger screen filter out of the carb. It had a 8 to 9 mm fragment of the inner liner of the fuel line. It occluded the out flow from the fuel screen in to the fuel chamber. The elbow that connects directly to the fuel line that comes directly from the pressure equalization sphere. Never found the flapper but did replace all of the fuel lines even though they were two years old.
Once back at the hanger after the dead stick, the engine started and ran fine. Even with pushing the power up to 80%. It was not until I pulled the carb of the aircraft thinking I had a seal failing in the carb. When the filter screen was pulled the inner liner fragments was found in the finger screen.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Eric Wobschall
Sent: Sunday, January 17, 2010 8:48 PM
To: yak-list(at)matronics.com
Subject: Re: husoi "surging"
I had just such a problem in my Yak-52. It was just that way... on takeoff, maybe 3/4 through the ground roll, a pronounced surging (and a fuel pressure drop to approx. .2).... which you could smooth out by retarding the throttle. After checking a lot of other things (governor, fuel vents, etc...), it turned out to be an obstruction (hose flapper) in the hose between the fine fuel strainer and the carb.
-Eric
On Jan 17, 2010, at 9:32 PM, Jon Boede wrote:
My friend said that his CJ is experiencing "surging" on take-off, really any time when he applies full throttle.
Says that is not seeing a wiggle in the RPM or manifold pressure... or at least he doesn't think so.
If he retards the throttle a bit the surging stops.
Weather here was 60+ degrees with very low humidity. Any ideas what might be causing that??
Jon | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Listhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/contribution |
0123456789 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
0 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
1 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
2 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
3 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
4 | Quote: | | href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List |
5
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ldakos(at)bigpond.net.au
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| Posted: Sun Jan 17, 2010 8:43 pm Post subject: husoi "surging" |
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I had a similar surging problem when I leaned fuel in my cj turned out
to be a cracked intake tube where boss is welded for the intake drain
the boss was ready to fall right out and the other 2 had also started to
go the same way.
Regards Lou
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ggg6(at)att.net
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| Posted: Sun Jan 17, 2010 10:42 pm Post subject: husoi "surging" |
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ggg6(at)att.net
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| Posted: Sun Jan 17, 2010 11:11 pm Post subject: husoi "surging" |
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ggg6(at)att.net
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| Posted: Sun Jan 17, 2010 11:22 pm Post subject: husoi "surging" |
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ggg6(at)att.net
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| Posted: Sun Jan 17, 2010 11:29 pm Post subject: husoi "surging" |
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