SMA HAS ROUGH ENG ON TKOF MAKES EMER LNDG.

Narrative

AFTER TKOF ON RWY 11; CLBED TO 700 FT; REQUESTED EBOUND DEP AND WAS CLRED ON COURSE. BEGAN L TURN; CONTINUING CLB. HEARD AND OBSERVED ON TACHOMETER A MOMENTARY 100-200 RPM LOSS WITH PWR RETURNING TO CLB PWR. FIRST THOUGHT WAS PERHAPS UNDETECTED WATER IN FUEL (HAD CLEAN FUEL PREFLT). WITHIN 5 SECONDS RPM DECREASED TO 2000 AND ENG BECAME ROUGH. AT THIS POINT ALT WAS STILL 700 FT. ADVISED TWR OF ROUGH ENG AND WAS CLRED TO LAND ON ANY RWY. WAS IN A POS TO BE ON A BASE FOR RWY 24. FLEW STRAIGHT TO THE RWY WHILE EXECUTING EMER CHKLIST. CARB HEAT/MIXTURE/FUEL PUMP (VERIFY ON)/PRIMER LOCKED/SWITCH TANKS/ TRY DIFFERENT MAGNETOS; NO CHANGE. SET UP SHORT FINAL AND LANDED RWY 24; SLIGHTLY FAST. ACFT SECURED. SPOKE WITH CRASH CREW AND TWR. GNDED ACFT PENDING INSPECTION BY MAINT. OVER THE NEXT DAY HEARD 2 CFIS PROCLAIM IT WAS 'CARB ICE;' THAT ACFT WOULD BE RUN UP AND HIGH SPD TAXI DONE AND IF ALL OK ACFT WOULD BE FLOWN. CLUB OWNER/MGR SAID 'NO-WAY' AND ACFT HELD FOR MAINT. ACFT CHKED AND FOUND 1 CYLINDER HAD LOST COMPRESSION AND POSSIBLE IGNITION PROB AT THAT CYLINDER. ACFT IN REPAIR AT THIS POINT. OH YES; PREFLT AND PRE TKOF RUN-UP WERE NORMAL. OBSERVATIONS: GLAD EMER PROC WERE AUTOMATIC/INSTINCTIVE. GLAD TO HAVE HAD SOME PWR THAT ALLOWED RETURN TO ARPT. SOMEWHAT DISAPPOINTED WITH ATTITUDE OF 'FELLOW' CFIS THAT PROB HAD TO BE CARB ICE. CARB ICE DID NOT FIT EVENTS. FOR THE FUTURE: KEEP EMER PROCS SHARP. WHEN TEACHING EMER PROCS WILL BE REINFORCED EVEN MORE. HAPPY/THANKFUL MY 12 YR OLD SON AND I SURVIVED MY FIRST 'PWR PROB!'