Techsan02

I don't have an opinion on shock cooling, because I don't know enough about it other than the opinions on the different forums. It is usually a hot debate that leads to some pretty significant bashing. However this article said if you don't initially bring the MP below 18" you can't shock cool the engine no matter the speed or altitude. Thanks for all the comments so far. It's good to see what everyone else does and what has worked for them. I'm still learning how to fly this machine and like advice coming from mooney specific pilots. Here's that article if anyone is interested. http://www.mooneyland.com/how-to-land-a-mooney-properly/

What is everyone's typical descent configuration in regards to MP and RPM in your C models. I've read so many things and so many different theories on other forums. I found what I thought was a good article and it said bring the MP back to 17 and RPM to 19 and as you descend it will give you 19 squared. I have been doing that now and seems to work fine. I've read many people that leave the RPM at their cruise setting and just adjust MP. When I am about to enter the pattern I do bring prop FULL forward. I have ready that some people don't due to engine wear and drag. It also helps slow you down if it's not full forward according to some. What is everyone's take and does engine life really take a hit by having prop full forward continuously throughout the landing phase? If there has been another thread that has covered this feel free to link it. I did not find one.

Thanks for the continued replies. I did not have any fluctuations in oil pressure. But I did have mixture full rich with carb heat on. I also was not familiar of the night problems with auto engine roughness. I hope that's not common knowledge cause I can't say I've heard of it. It's good to know others have experienced it and it seems to be nothing major! Great responses!!

Thank you for the replies. I did have carb heat on starting at the beginning of my descent and mixture rich. I have never noticed this, and it was about every 30-45 seconds and short in durations. No vibration but more of a pulsating or surge. It was just eye opening because I hadn't noticed it yet in flight. Just had the right mag fixed due to the last guy who obviously did not know what he was doing. Possibly need mag overhaul or spark plugs.

I have a question as a brand new Mooney pilot. I have lurked on the site for quite some time and learned some valuable information. Real quick, I currently fly a M20C with the Johnson Bar, and have all of about 10 hours in this airplane so I am still learning it. Unfortunately, a search of the forum didn't yield my answer. Last night I took a short 39nm trip to another airport and back. On the way back during my descent (of all about 1500 ft.) I began to feel what I can only describe as a "pulsating" coming from the engine. It is not what I consider "roughness". All of my engine instruments were in the green and I was not losing RPM's. Visually everything looked perfect. I will thing happening at night made it even more worrisome. I made it back no problems and when I got on the ground did a quick run-up and no issues. It seemed like a loss of power the way it felt, but nothing showed that to be the case. RPM was around 2300 in the green and MP maybe around 18". This happened quickly mind you as I started the descent. As I got close to entering the pattern I applied full prop and the "pulsating" continued. I hope with this limited information maybe someone can point me in the right direction. I will probably have someone look at it, but thought I would see what possibly is going on.