---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Thu 07/12/12: 4 ---------------------------------------------------------- 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 _____________________________________ Time: 12:16:04 AM PST US From: Claire and Gary Eady Subject: JabiruEngine-List: Auto-response 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 _____________________________________ Time: 02:36:49 PM PST US From: "Jeffrey J Paris" Subject: JabiruEngine-List: 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 _____________________________________ Time: 04:43:01 PM PST US From: Paul Mulwitz Subject: Re: JabiruEngine-List: 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 _____________________________________ Time: 08:02:21 PM PST US Subject: JabiruEngine-List: What is the relationship between From: "AirEupora" 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? 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