robert14

George, a few days ago I posted a review of my high oil temp problem on my m20E: "High differential oil temperature between factory guage and EDM 700. I typically see 230 deg oil temps while climbing and 225 while cruising. I happened to come across SB M20-182 and the associated kit on the Mooney web site. Mooney sold me the kit for about $240 and overnighted via UPS. It took my mechanic 6.5 hours to install. The outcome is extrodinary. My oil temps, even during climp are now 200 or 199, on the EDM 700. My factory guage shows a steady 190 to 195 deg. That is a 25 deg drop in oil temp. My CHTs have gone down almost 40 degs. Before you spend the money on a new cowl, you might want to try the Mooney kit. The price is right. I also have the actual data downloaded from my EDM 700. Robert

I just purchased the Mooney engine cooling kit mod as specified in Mooney Service Bulliten M20E-182-1. Does anyone have any experience with this mod? Thanks.

PePerry, another data point: there is a pilot report of a 1967 M20F on the internet. Go to Google and search for "Mooney M20F report". The report will be the first item listed. The report includes oil and CHT temperatures recorded from test flights of three different M20s: an M20C, an M20 E, and an M20F. These are measurements taken from the factory guages. I do not believ the M20E oil temp, 160 deg. Probably a bad sensor or guage. But the M20F temps are interesting. They were getting between 195 and 205 during the climb, the same as I am seeing on my factory guage.

PePerry, I also talked to the folks who do my oil analysis, Lab One Aviation. They told me 20 to 30 deg difference was normal based on their discussions with their other customers. If you are having oil analysis done, you might talk with them to get their thoughts. Just another data point. My Mooney mechanic told me that my temps are normal for M20Es and Fs.

PePerry, we are both seeing a 30 deg difference between the two probes. Interesting. My veritheum is set to 85 deg C (185 deg F). Do you know what yours is set to?

PePerry, I also talked with the JPI guy. He assured me that a 20 deg difference was normal. That is probably as good as it is going to get. What about your CHTs between the left and right side? Are the left ones hotter then the right ones? You may have to download and plot the CHTs to verify the difference.

Thanks for the help Stacey. One more question. CHTs 1 and 3 run within 5 deg of each other. CHTs 2 and 4 run within 5 degs of each other; however, 2 and 4 run 40 to 50 deg hotter then 1 and 3. Is this normal?

A year ago I purchased and upgraded a 1965 M20E, including the addition of an EDM-700. The engine has 500 hours SMOH. The readings from my EDM-700 and factory guages have always been different. The EDM-700 tempature sensor is screwed into the right front of the engine block right behind the prop. The factory temperature is on the back of the engine near the oil filter. The guages have been calibrated, the oil cooler is new, and the 85 deg C ver... has been removed, tested and replaced. All the hoses are new. Here is the scenrio: 1. At room temp, in the hanger, they read the same. 2. At runup, they both are the same until about 160 deg. 3. At climb-out, 120 MPH, the EDM-700 temperature begins to climb above the factory guage. 4. At cruise and 25-25, the factory guage is reading 222 deg while the factory guage is at 200 deg. 5. If I close the cowl flaps, the temperatures go up to 228 (EDM-700) and 205 (factory guage). 205 deg is well within the green on the factory guage. 228 would be on the edge of the green on the factory guage. 6. Mixture does not effect the temperature. 7. After landing and engine shut-off, the EDM-700 temperature compares withing one degree of my handheld IR sensor pointed at the temperature probe on the front of the engine at 195 deg F. The factory guage is reading 185 -190 deg F. Any thoughts on this temperature difference? Does anyone have any temp data from their 65 M20E? Is the location of the probes causing the diffeence?