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Odd running cylinder

 
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recapen(at)earthlink.net
Guest
PostPosted: Mon Jun 28, 2010 8:13 am    Post subject: Odd running cylinder Reply with quote
Configuration reminder:
RV6A
SamJames cowl/plenum
AeroSportPower built XP IO360B1F6
9.2:1 pistons
AFP injection (Flow balanced to .1gph per AFP instructions)
LASAR ignition (MAP monitor on #4, CHT monitor on #3)
Vetterman Dual crossover exhaust with heater/mufflers
MT three blade MTV12B183-59 propellor

During the first few minutes of operation (essentially through climb-out and throttle-back), my number one cylinder indicates a higher CHT and EGT.
Neither the CHT or EGT raise to a dangerous level and both return to normal upon establishing cruise settings.
My number one cylinder also has an injector restrictor that is 5% larger than the other three in order to balance fuel flow for leaning purposes.

This has occurred seven out of the last eight flights. The missing one is kinda in the middle.

Data capture is through an AFS3400EM at 1 second intervals. I have data and graphs if someone wants to look-see.

I am wondering if I might have something in the fuel injection distribution spider that is partially blocking one line below a certain flow rate.

Any other thoughts,
Ralph
RV6A N822AR (at) N06 70 hours

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rickpegser(at)yahoo.com
Guest
PostPosted: Mon Jun 28, 2010 11:28 am    Post subject: Odd running cylinder Reply with quote
souunds like an intake leak
rick

--- On Mon, 6/28/10, Ralph E. Capen <recapen(at)earthlink.net> wrote:

Quote:
From: Ralph E. Capen <recapen(at)earthlink.net>
Subject: Odd running cylinder
To: "rv-list" <rv-list(at)matronics.com>
Date: Monday, June 28, 2010, 9:12 AM

"Ralph E. Capen" <recapen(at)earthlink.net>

Configuration reminder:
RV6A
SamJames cowl/plenum
AeroSportPower built XP IO360B1F6
9.2:1 pistons
AFP injection (Flow balanced to .1gph per AFP
instructions)
LASAR ignition (MAP monitor on #4, CHT monitor on #3)
Vetterman Dual crossover exhaust with heater/mufflers
MT three blade MTV12B183-59 propellor

During the first few minutes of operation (essentially
through climb-out and throttle-back), my number one cylinder
indicates a higher CHT and EGT.
Neither the CHT or EGT raise to a dangerous level and both
return to normal upon establishing cruise settings.
My number one cylinder also has an injector restrictor that
is 5% larger than the other three in order to balance fuel
flow for leaning purposes.

This has occurred seven out of the last eight
flights.  The missing one is kinda in the middle.

Data capture is through an AFS3400EM at 1 second
intervals.  I have data and graphs if someone wants to
look-see.

I am wondering if I might have something in the fuel
injection distribution spider that is partially blocking one
line below a certain flow rate.

Any other thoughts,
Ralph
RV6A N822AR (at) N06 70 hours




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recapen(at)earthlink.net
Guest
PostPosted: Mon Jun 28, 2010 11:38 am    Post subject: Odd running cylinder Reply with quote
I will check that one out....

Never heard of one closing itself after take-off though....

Thanks
--

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pitts_pilot(at)bellsouth.
Guest
PostPosted: Mon Jun 28, 2010 8:13 pm    Post subject: Odd running cylinder Reply with quote
Intake leaks are easy to find. clean out your shop vac real good and set it up to blow instead of suck.
Stick the hose in the intake and seal with shop rags. Spray soapy water all over the intake system and look for bubbles. Two most common leaks are the intake coupling hoses and the are where the intake comes out of the oil pan ..... that's a swaged part, and to fix correctly requires a swaging tool. I've seen them fixed with JB Weld to silicone sealer though.
Linn



RICHARD MILLER wrote: [quote]
Quote:
--> RV-List message posted by: RICHARD MILLER <rickpegser(at)yahoo.com> (rickpegser(at)yahoo.com)

souunds like an intake leak
rick

--- On Mon, 6/28/10, Ralph E. Capen <recapen(at)earthlink.net> (recapen(at)earthlink.net) wrote:

Quote:
From: Ralph E. Capen <recapen(at)earthlink.net> (recapen(at)earthlink.net)
Subject: Odd running cylinder
To: "rv-list" <rv-list(at)matronics.com> (rv-list(at)matronics.com)
Date: Monday, June 28, 2010, 9:12 AM
--> RV-List message posted by:
"Ralph E. Capen" <recapen(at)earthlink.net> (recapen(at)earthlink.net)

Configuration reminder:
RV6A
SamJames cowl/plenum
AeroSportPower built XP IO360B1F6
9.2:1 pistons
AFP injection (Flow balanced to .1gph per AFP
instructions)
LASAR ignition (MAP monitor on #4, CHT monitor on #3)
Vetterman Dual crossover exhaust with heater/mufflers
MT three blade MTV12B183-59 propellor

During the first few minutes of operation (essentially
through climb-out and throttle-back), my number one cylinder
indicates a higher CHT and EGT.
Neither the CHT or EGT raise to a dangerous level and both
return to normal upon establishing cruise settings.
My number one cylinder also has an injector restrictor that
is 5% larger than the other three in order to balance fuel
flow for leaning purposes.

This has occurred seven out of the last eight
flights. The missing one is kinda in the middle.

Data capture is through an AFS3400EM at 1 second
intervals. I have data and graphs if someone wants to
look-see.

I am wondering if I might have something in the fuel
injection distribution spider that is partially blocking one
line below a certain flow rate.

Any other thoughts,
Ralph
RV6A N822AR (at) N06 70 hours


Forum -
FAQ,
- MATRONICS WEB FORUMS -
List Contribution Web Site -
-Matt
Dralle, List Admin.





[b]

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martinaerodrome(at)gmail.
Guest
PostPosted: Tue Jun 29, 2010 5:27 am    Post subject: Odd running cylinder Reply with quote
Ralph,
It is not onusual to have a experience such as you mention.  On take off and climb, the engine is at its highest power and the airplane  is usually flying slower than in cruise.
Dick Martin
RV8 N233M
the fast one
On Mon, Jun 28, 2010 at 11:12 AM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
[quote]--> RV-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net (recapen(at)earthlink.net)>

Configuration reminder:
RV6A
SamJames cowl/plenum
AeroSportPower built XP IO360B1F6
9.2:1 pistons
AFP injection (Flow balanced to .1gph per AFP instructions)
LASAR ignition (MAP monitor on #4, CHT monitor on #3)
Vetterman Dual crossover exhaust with heater/mufflers
MT three blade MTV12B183-59 propellor

During the first few minutes of operation (essentially through climb-out and throttle-back), my number one cylinder indicates a higher CHT and EGT.
Neither the CHT or EGT raise to a dangerous level and both return to normal upon establishing cruise settings.
My number one cylinder also has an injector restrictor that is 5% larger than the other three in order to balance fuel flow for leaning purposes.

This has occurred seven out of the last eight flights.  The missing one is kinda in the middle.

Data capture is through an AFS3400EM at 1 second intervals.  I have data and graphs if someone wants to look-see.

I am wondering if I might have something in the fuel injection distribution spider that is partially blocking one line below a certain flow rate.

Any other thoughts,
Ralph
RV6A N822AR (at) N06 70 hours

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=====

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