Today's Message Index:
----------------------
1. 06:43 AM - Tilt (BobbyPaulk@comcast.net)
2. 07:11 AM - Re: Hot Cylinder (Bob Haring)
3. 07:39 AM - Re: Tilt (Tim Yoder)
4. 08:18 AM - Re: Tilt (Rob Turk)
Message 1
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List
Below is the exact wording (copied and pasted ) from "Tuning the Bing Carbu
retor on the Jabiru Engine"
"As the flow speeds into the intake manifold it is split left and right by
a symmetrical airfoil called a diffuser. If, for instance, the airflow spir
als in a clockwise
movement as it progresses through the carb throat it will pick up fuel at t
he bottom of
the throat and begin moving the fuel to the left. Before the fuel is evenly
spread
through the incoming air stream the flow hits the diffuser and splits left
and right. The
result is that the fuel /. Air mixture delivered to the left side (cylinder
s 2,4,6) has more
fuel in it (richer) than that delivered to the right side (1,3,5). The left
side will be leaner
=93 therefore hotter EGT=99s. By rotating the bottom of the car
b toward the right (hot side)
you move the fuel pickup toward the right."
I am confused about what they are saying. IF the left side is "richer" and
has more fuel in it it should be COOLER.
The left side will NOT be leaner. The last sentence should be correct.
So I tilt the BOTTOM of the Carb toward my hot cylinder #6 and should cool
it a bit??
bobby
Message 2
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| Subject: | Re: Hot Cylinder |
Bob,
Pete said to tilt the bottom towards the hot side
Bob H.
zman601xl@aol.com
-----Original Message-----
From: BobbyPaulk <BobbyPaulk@comcast.net>
Sent: Tue, Jun 9, 2015 5:42 pm
Subject: JabiruEngine-List: Hot Cylinder
I removed my carb recently and re-installed it level. Does any one remember which
way to tilt the TOP of the carb.
Is it toward the hot cylinder or away from it. I promise to write it down and post
it all over my logs.
My #6 cylinder is about 150 degrees hotter than the other EGT's which makes the
CHT close to 350.
I had all the CHT's under 300 at a low cruise of 2450.
Bobby ( age 77 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 237 hrs.
Do Not Archive
Message 3
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As I understand it, you have only one hot cyl. #6 . If you tilt the bottom
of the carb to the left all three cylinders should run cooler, 2,4 and 6. If
2 and 4 are good, you may have another issue with #6. Maybe an induction
leak or???
Tim
_____
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
BobbyPaulk@comcast.net
Sent: Wednesday, June 10, 2015 6:43 AM
Subject: JabiruEngine-List: Tilt
List
Below is the exact wording (copied and pasted ) from "Tuning the Bing
Carburetor on the Jabiru Engine"
"As the flow speeds into the intake manifold it is split left and right by
a symmetrical airfoil called a diffuser. If, for instance, the airflow
spirals in a clockwise
movement as it progresses through the carb throat it will pick up fuel at
the bottom of
the throat and begin moving the fuel to the left. Before the fuel is evenly
spread
through the incoming air stream the flow hits the diffuser and splits left
and right. The
result is that the fuel /. Air mixture delivered to the left side (cylinders
2,4,6) has more
fuel in it (richer) than that delivered to the right side (1,3,5). The left
side will be leaner
- therefore hotter EGT's. By rotating the bottom of the carb toward the
right (hot side)
you move the fuel pickup toward the right."
I am confused about what they are saying. IF the left side is "richer" and
has more fuel in it it should be COOLER.
The left side will NOT be leaner. The last sentence should be correct.
So I tilt the BOTTOM of the Carb toward my hot cylinder #6 and should cool
it a bit??
bobby
---
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Message 4
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There must be a typo there. I think where it now reads "The left side
will be leaner", it should have read "The right side will be leaner".
This document came from Pete Krotje (USJabiru) who definitely knows what
he's talking about. He wrote a shorter version which does explain it
properly. Must be a slip of the pen.
Rob
On 6/10/2015 3:43 PM, BobbyPaulk@comcast.net wrote:
> List
> Below is the exact wording (copied and pasted ) from "Tuning the Bing
> Carburetor on the Jabiru Engine"
>
>
> "As the flow speeds into the intake manifold it is split left and right by
> a symmetrical airfoil called a diffuser. If, for instance, the airflow
> spirals in a clockwise
> movement as it progresses through the carb throat it will pick up fuel
> at the bottom of
> the throat and begin moving the fuel to the left. Before the fuel is
> evenly spread
> through the incoming air stream the flow hits the diffuser and splits
> left and right. The
> result is that the fuel /. Air mixture delivered to the left side
> (cylinders 2,4,6) has more
> fuel in it (richer) than that delivered to the right side (1,3,5). The
> left side will be leaner
> therefore hotter EGTs. By rotating the bottom of the carb toward
> the right (hot side)
> you move the fuel pickup toward the right."
>
> I am confused about what they are saying. IF the left side is "richer"
> and has more fuel in it it should be COOLER.
> The left side will NOT be leaner. The last sentence should be correct.
>
> So I tilt the BOTTOM of the Carb toward my hot cylinder #6 and should
> cool it a bit??
>
> bobby
> *
>
>
> *
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