Hi gang.
Today, the wifey and me loaded up the -7 for a 3-day trip to Sweden, but we didn't get far: start, runup and takeoff-roll normal but at 500', we both felt a slight vibration and I noticed the EGT on #2 was approx 650*F.
CHT on #2 where at the same level as the others: about 400*F.
I turned back towards the field and entered downwind.
The vibration got slightly worse when reducing power to about 15'MAP on downwind.
The #2 EGT continued to show beetween 600 and 650, varying slightly with power.
There where also a few pops heard, and to me they seemed to come from the exhaust system.
The pops continued during base and final, both on low powersetting (15 MAP) and idle.
After taxi inn, I tried to do a mag check but the engine sounded rough when I advanced power from idle, so I only did a quick mag check at 1500 RPM before shutting down.
The roughness where present at both mags, when tested separately, as well as on "both".
After shutdown, I pulled the cowl and checked the P-mag timing: both bang on.
Then it was time to call it a day, accept the fact that the great weather forcast for the next few days, where not to be spent flying in Sweden.
My plan is to check the compression as the next step. I'm thinking that this must have something to do with cyl 2. Maybe sticky valves?
The engine has about 41 hrs TT, I'm still using mineral oil and running it hard.
I'm certainly no engine expert so I'm wondering if anyone have some advice regarding what to check to determine the cause?
Today, the wifey and me loaded up the -7 for a 3-day trip to Sweden, but we didn't get far: start, runup and takeoff-roll normal but at 500', we both felt a slight vibration and I noticed the EGT on #2 was approx 650*F.
CHT on #2 where at the same level as the others: about 400*F.
I turned back towards the field and entered downwind.
The vibration got slightly worse when reducing power to about 15'MAP on downwind.
The #2 EGT continued to show beetween 600 and 650, varying slightly with power.
There where also a few pops heard, and to me they seemed to come from the exhaust system.
The pops continued during base and final, both on low powersetting (15 MAP) and idle.
After taxi inn, I tried to do a mag check but the engine sounded rough when I advanced power from idle, so I only did a quick mag check at 1500 RPM before shutting down.
The roughness where present at both mags, when tested separately, as well as on "both".
After shutdown, I pulled the cowl and checked the P-mag timing: both bang on.
Then it was time to call it a day, accept the fact that the great weather forcast for the next few days, where not to be spent flying in Sweden.
My plan is to check the compression as the next step. I'm thinking that this must have something to do with cyl 2. Maybe sticky valves?
The engine has about 41 hrs TT, I'm still using mineral oil and running it hard.
I'm certainly no engine expert so I'm wondering if anyone have some advice regarding what to check to determine the cause?