Have stock Super Cub 150. Engine overhauled 200 hours ago. Before overhaul, oil temperature always on low side - less than 180F. Since overhaul, oil temperature has become a problem. It has become very sensitive to the ambient temperature. Figures would roughly be the following:
Ambient 0C/32F Oil Temp settles 180F. Ambient 10C/50F Oil Temp settles 190F. Ambient 20C/68F Oil Temp about 210F. Ambient 30C/86F (unusually hot for where I live) Oil Temp can get to 235F!!!
I only have CHT reading on cylinder 4 - also seems hot 200 to 220C - although not sure how accurate the CHT instrument is.
Have tried various things - Oil Cooler gets hot so presumably Vernatherm working OK - Oil Temp gauge calibrated for accuracy - Baffles carefully reworked.
The Cowling setup on the Cub seems very inefficient with a large gap around the oil cooler allowing ram air into bottom of cowling - also large air gaps in air intake area around the starter ring and so on - but this doesn't seem to be a problem for most Super Cubs.
Any ideas?
Would a baffle fabricated around the oil cooler to only allow ram air through the cooler and not around it be of any use.
Any thoughts gratefully received.
Ambient 0C/32F Oil Temp settles 180F. Ambient 10C/50F Oil Temp settles 190F. Ambient 20C/68F Oil Temp about 210F. Ambient 30C/86F (unusually hot for where I live) Oil Temp can get to 235F!!!
I only have CHT reading on cylinder 4 - also seems hot 200 to 220C - although not sure how accurate the CHT instrument is.
Have tried various things - Oil Cooler gets hot so presumably Vernatherm working OK - Oil Temp gauge calibrated for accuracy - Baffles carefully reworked.
The Cowling setup on the Cub seems very inefficient with a large gap around the oil cooler allowing ram air into bottom of cowling - also large air gaps in air intake area around the starter ring and so on - but this doesn't seem to be a problem for most Super Cubs.
Any ideas?
Would a baffle fabricated around the oil cooler to only allow ram air through the cooler and not around it be of any use.
Any thoughts gratefully received.