320 or 360
- Thread starter Bill Rusk
- Start date
mongo
Registered User
Bill Rusk
BENEFACTOR
Sandpoint, Idaho
Well, after a great deal of thought and consideration I have elected to go with the 0-360.
I had a memory of my ill fated trip on floats where I found the ABSOLUTE ceiling of my 0-320 hot-rod cub to be 10,200' (approaching Great Falls, Montana). As a result I could not go over the mountains, I had to go through the Rogers Pass adding time and miles. The mountains were about 9,500' but I did not want to cross at 10,200 when I was literally hanging on a pin trying to keep the plane at that altitude. I know the prop also plays a factor here. It was a cool day as well, in the summer my performance would have been worse. My mission (hopefully) includes lots of mountain lakes in the summer and I may see high density altitudes thus the more power the better. Now the next issue becomes, how to get the most Hp for the weight. Who makes the lightest 0-360?
I have heard all kinds of claims regarding the weight difference between narrow deck, wide deck, tapered fin cyls, narrow deck cyls Vs wide deck cyls, New ECI Vs older engines.
I went to the engine shop today and did a little mythbusters testing,...........
Narrow Deck case, Mid 60's vintage, with banana plates, = 52.3 pounds
Wide Deck case, Mid 60's vintage, A2B = 49.0 pds
Wide Deck case, Mid 60's vintage, B1A = 48.5 pds
Wide Deck case, Mid 70's vintage, E2D = 49.85 pds
Wide Deck case 2010 vintage =53.95 pds
So the narrow deck is not necessarily the lightest case and it is certainly not 8 pounds lighter as one person said. The max difference here is 5.5 pounds. Mostly between the older case and the newest case. Several folks did say that the case has gotten progressively heavier over the years and that does seem to be true.
Narrow deck Cyl, with valves and springs only, 19.3 pounds
Wide deck cyl, " ", 19.45
Wide deck cyl, " ", 19.0
Wide deck cyl, " ", 19.60
So if we average the wide deck cyls we get 19.35. That is not a significant difference. So wide deck cyls Vs narrow deck cyls are a wash.
The new ECI tappered fin cyls are 4 ounces lighter than the std cyls according to Monty Barrett. Thus 1 pound total for the engine.
Banana plates for the narrow deck case (included on the case weight above) are 1.6 pounds
Through studs for the cases above (included in the above weights) are 1.8 pounds
I thought I would throw this out there for folks to consider, and also to tie up this thread.
If you are researching threads on engines you might also want to look at this thread......
http://www.supercub.org/forum/showthread.php?41932-Hot-rodded-engines-Do-they-really-work
This thread, and the Hot-rodding engines thread, also tie into my thread on Building a Javron Cub.......here
http://www.supercub.org/forum/showt...g-a-Javron-Cub&highlight=Building+Javron+Bill
Hope this helps
Bill
I had a memory of my ill fated trip on floats where I found the ABSOLUTE ceiling of my 0-320 hot-rod cub to be 10,200' (approaching Great Falls, Montana). As a result I could not go over the mountains, I had to go through the Rogers Pass adding time and miles. The mountains were about 9,500' but I did not want to cross at 10,200 when I was literally hanging on a pin trying to keep the plane at that altitude. I know the prop also plays a factor here. It was a cool day as well, in the summer my performance would have been worse. My mission (hopefully) includes lots of mountain lakes in the summer and I may see high density altitudes thus the more power the better. Now the next issue becomes, how to get the most Hp for the weight. Who makes the lightest 0-360?
I have heard all kinds of claims regarding the weight difference between narrow deck, wide deck, tapered fin cyls, narrow deck cyls Vs wide deck cyls, New ECI Vs older engines.
I went to the engine shop today and did a little mythbusters testing,...........
Narrow Deck case, Mid 60's vintage, with banana plates, = 52.3 pounds
Wide Deck case, Mid 60's vintage, A2B = 49.0 pds
Wide Deck case, Mid 60's vintage, B1A = 48.5 pds
Wide Deck case, Mid 70's vintage, E2D = 49.85 pds
Wide Deck case 2010 vintage =53.95 pds
So the narrow deck is not necessarily the lightest case and it is certainly not 8 pounds lighter as one person said. The max difference here is 5.5 pounds. Mostly between the older case and the newest case. Several folks did say that the case has gotten progressively heavier over the years and that does seem to be true.
Narrow deck Cyl, with valves and springs only, 19.3 pounds
Wide deck cyl, " ", 19.45
Wide deck cyl, " ", 19.0
Wide deck cyl, " ", 19.60
So if we average the wide deck cyls we get 19.35. That is not a significant difference. So wide deck cyls Vs narrow deck cyls are a wash.
The new ECI tappered fin cyls are 4 ounces lighter than the std cyls according to Monty Barrett. Thus 1 pound total for the engine.
Banana plates for the narrow deck case (included on the case weight above) are 1.6 pounds
Through studs for the cases above (included in the above weights) are 1.8 pounds
I thought I would throw this out there for folks to consider, and also to tie up this thread.
If you are researching threads on engines you might also want to look at this thread......
http://www.supercub.org/forum/showthread.php?41932-Hot-rodded-engines-Do-they-really-work
This thread, and the Hot-rodding engines thread, also tie into my thread on Building a Javron Cub.......here
http://www.supercub.org/forum/showt...g-a-Javron-Cub&highlight=Building+Javron+Bill
Hope this helps
Bill
Last edited:
aktango58
FRIEND
9aa9
Ignorance alert:
are there narrow deck o-360'? or are you quoting the o-320 part weights?
Please remember Bill, in Alaska, a high mountain lake for fishing is normally a DA of about 500'... and in the early am we often see -500 in our lakes:smile:
As Bushwheel Bill says: Magical Air!
are there narrow deck o-360'? or are you quoting the o-320 part weights?
Please remember Bill, in Alaska, a high mountain lake for fishing is normally a DA of about 500'... and in the early am we often see -500 in our lakes:smile:
As Bushwheel Bill says: Magical Air!
skywagon8a
MEMBER
SE Mass MA6
Bill, I was not aware of the tapered fin cylinders until my new IO-550 showed up from Continental with them installed. After thinking about why? It became clear to me that, since the hottest part of the cylinder is at the head, it would make sense to reduce the fin diameter towards the base. This will provide more even cooling through the cylinder walls thus reducing distortion and increasing efficiency. You might label this as "tuned cylinder walls".
