I recently realized that the KR-2 that I purchased has a very restricted exhaust system. The engine exhaust ports are 1.5" while the exhaust pipes are 1.0". (Champs and Cubs have 1.5" exhausts.) This means that the exhaust area is reduced by about 50%. This is on a Continental A65 (65 H.P., 171 cu. in.) engine. This same basic engine model produces up to 80 H.P. at higher rpm.
Does anyone have an opinion on the effects (power, engine life, temperature, etc.) of this restriction? I have 4 pipes and no mufflers or other restrictions. I temporarily installed Champ exhausts with no change in static RPM (2200). I couldn't fly because I couldn't install my cowling. Ken Jones N5834 24.8 test hrs, 15.2 to go.
