1928 Oil Return Tube

[RonLey]

I tried the search but didn't find my answer. What are the disadvantages of running the early 1928 valve cover with the higher return? I understand that it kept more oil in the area. There was obviously a reason it was changed pretty early but haven't found the answer. The other question is what was the length of the tube? I have always ran the later style but came across the '28 style at a swap meet. Just curious. Thanks.

Ron

 

[Bob C]

The oil return pipe and valve cover weren't changed until May 1929.
According to the Service Bulletins, page 342, it was done to keep oil away from the
valve springs and reduce oil consumption.

Bob

 

[RonLey]

Thanks Bob

 

[Tom Wesenberg]

Higher oil would give a little more pressure to the mains. It wouldn't be much though.

 

[Ron in Quincy]

The earlier blocks also did not have a oil passage way to the rear cam bearing from the oil chamber; the Service Bulletins also covers how to drill this passageway.

Ron

 

[katy]

The other question is what was the length of the tube?

The short tube is 14 1/2" centre to centre of the bolt holes, the long one is 15".
Overall length is aprox 1 1/2" longer.
My measurements, they may be out a smidge.