Home › Forum › Ask A Member › Oil ratio for a Scott Atwater 16 › Re: Oil ratio for a Scott Atwater 16
June 20, 2016 at 1:24 pm
#38654
quote Fisherman6:
I picked one of my motors to use as a test mule. It’s a 62 Johnson 5.5 I rescued from the parts pile.
This test might take quite a few years as your test motor has needle bearings on the big end of the connecting rods and is of the same design as the later six horse motors which ran on 50:1 with sleeve type bearings on the cranks main journals. To give a motor a real test, you’d want to sacrifice a 1960 or earlier 5.5 with sleeve (friction) type bearings on the rods.
One thing I know, I’ve seen several 5.5 and 7.5 horse motors over the years with a connecting rod hanging out the side of the block but never a blown six horse when these motors were using a 50:1 mix with dino oil. 🙁
I wonder if full synthetic would have saved this motor.