Today's Message Index:
----------------------
1. 12:16 AM - Auto-response (Claire and Gary Eady)
2. 02:36 PM - CHT temp and ram air duct question (Jeffrey J Paris)
3. 04:43 PM - Re: CHT temp and ram air duct question (Paul Mulwitz)
4. 08:02 PM - What is the relationship between (AirEupora)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Claire and Gary are currently out of town until Monday 13th August but will be
checking their email periodically. There may be some delay in responding.
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | CHT temp and ram air duct question |
Dear List,
=C2-
I am runnning a Jab 3300 on a Zenith CH601XLB experimental that I built.
=C2-The last few years I have been doing my best to get control and manage
the cooling of my CHT's. =C2-I'm am getting real close to pretty good tem
ps with the addition of some baffles in my ram air ducts. =C2-Before the b
affles my #4 cylinder ran hottest, now that I have that under control my #5
and #6 cylinders are running as hottest almost neck to neck. =C2-Without g
oing into great detail, I am wondering what is the best action to take with
what I assume will be to trim the inner ram airduct baffling to increase air
flow to these cylinders without hurting the airflow on cylindeers #3 & =C2
-#4.
=C2-
Do I work front to back, or back to front and how much do I take off? =C2
-Thanks for your time and consideration.
=C2-
Jeff Paris 2 Jabs one in a Zentith the other in a Europa. =C2-Rochester NY
=C2-
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CHT temp and ram air duct question |
Hi Jeff,
Just for fun you might try increasing the height of the low baffle by
1/2 inch or even 1 inch in front of cyl #1 and/or #2. I know this makes
no sense, but it worked for me on a similar setup. I had no problems at
all with 2/4/6 and a nearly never ending battle with 1/3/5.
Paul
Camas, WA
Zodiac XL, Jab 3300 nearing end of phase I testing
On 7/12/2012 2:36 PM, Jeffrey J Paris wrote:
> Dear List,
> I am runnning a Jab 3300 on a Zenith CH601XLB experimental that I
> built. The last few years I have been doing my best to get control
> and manage the cooling of my CHT's. I'm am getting real close to
> pretty good temps with the addition of some baffles in my ram air
> ducts. Before the baffles my #4 cylinder ran hottest, now that I have
> that under control my #5 and #6 cylinders are running as hottest
> almost neck to neck. Without going into great detail, I am wondering
> what is the best action to take with what I assume will be to trim the
> inner ram airduct baffling to increase airflow to these cylinders
> without hurting the airflow on cylindeers #3 & #4.
> Do I work front to back, or back to front and how much do I take off?
> Thanks for your time and consideration.
> Jeff Paris 2 Jabs one in a Zentith the other in a Europa. Rochester NY
> *
>
>
> *
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | What is the relationship between |
High cylinder temps and propeller pitch?
Today, I got the first good flight out of my Europa with the Jabiru 3300L. This
is the seventh flight and I only have two hours on the engine. I have been
chasing high cylinders temp and high oil temps. I'm getting close to having the
oil temps under control. Most of it is getting the opening around the oil
cooler correct. Right now 4 & 6 are running high CHT at full power. I'm only
getting about two to three minutes of operation at these power settings. The
RPM is starting to come up and I got 2900 for almost a minute.
EGT's are within 50 degrees of each other. I have a stock needle and seat. Not
sure what the numbers are.
The reason I'm asking is I had a Navion and the prop company pitch it too high
and my CHT were to high. Once I had it re-pitched the CHT came down and the oil
temp came down.
I'm thinking I should do the same for this engine. Decrease the pitch on the ground
adjustable prop.
Does anybody have any ideals or suggestion?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=378164#378164
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|