Home › Forum › Ask A Member › 1950 Speeditwin 6039 Rods
- This topic has 27 replies, 6 voices, and was last updated 4 years, 3 months ago by Buccaneer.
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December 25, 2019 at 7:22 pm #189836
My post disappeared – I said some things to the computer that made my cat hide. second try . . .
The last superseding number is 276776, two specified. The Speedifour uses the same connecting rod. On the Speeddifour you can see the oil hole is on the short side of the offset, which is the port cylinder.
- This reply was modified 4 years, 4 months ago by seakaye12.
- This reply was modified 4 years, 4 months ago by RICHARD A. WHITE.
December 25, 2019 at 7:22 pm #189837My post disappeared – I said some things to the computer that made my cat hide.My fourth try . . .
The last superseding number is 276776, two specified. The Speedifour uses the same connecting rod. On the Speedifour you can see the oil hole is on the short side of the offset, which is the port cylinder.
December 26, 2019 at 1:18 pm #190023disappearing post
December 26, 2019 at 1:21 pm #190024third try
In the early 1940s the Navy saw a need for a high pressure portable firefighting pump. The highest power outboard at that time was the Evinrude Racing 460. Evinrude modified it to become the Storm Boat Motor, Johnson modified it to become the P500 Pumper. Being portable, it may not have a good source of water. Bubbles in the input caused periods of over the red line engine speed. Johnson designed a shorter heavy duty connecting rod for the pumper. After the war these Army Surplus pumps were snapped up and rebuilt to be used as racers. At one time Clyde Weisman (Wisco Piston Co.) furnished a high dome racing piston for the Speeditwin that used these shorter pumper rods.December 26, 2019 at 1:24 pm #190026fifth try
December 26, 2019 at 1:35 pm #190027One fuel tank was used while the other could be taken to be refilled.
- This reply was modified 4 years, 4 months ago by garry-in-michigan.
December 26, 2019 at 6:34 pm #190052Thanks Garry for the interesting information on the Speeditwin rod conversions
and history of the fire pumps. I have the Evinrude version of the firepump
using the Imperial Lightwin. It’s a little weak on compression and would
probably need new crankshaft main bushings to be a runner.I put the rods back in my Speeditwin today. I knew the crankshaft rod
journals were a little worn and etched, but noticed also today
that the rod shells are etched in spots also. Hope it will hold together
for a yearly ride, or until I run across better parts, or entire different motor.Happy New Year!
Prepare to be boarded!
December 26, 2019 at 6:49 pm #190054My reply disapeared 🙁
Prepare to be boarded!
December 26, 2019 at 6:50 pm #190055December 26, 2019 at 8:10 pm #190025
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