In article ,
"K. Smith" wrote:

Matt Lang wrote:
Folks,

I was wondering where the oil goes that the DFI motor pumps to the
crankbearings. Does it accumulate in the crankcase and eventually
gets dragged in the cylinders and burned? Is this the oil the DFI
motor burns as it has no oil in the fuel itself? I couldnt find info
about this in my optimax shopmanual ..

Karen maybe you know this?

Matt

Yes; just as you know who says:-) it's supposed to be "burnt". It is
injected in such small amounts at idle that it doesn't really go
anywhere at idle, till you rev up then any excess gets "transferred" &
probably some does actually get burnt.

However, because it's undiluted raw oil, a good part of it goes
straight out the exhaust port still as raw oil.

So when people comment about the absence of "smoke" from the DFIs
that's true, because the oil isn't diluted with fuel.

You've probably noticed it's a bit oily around it's nether regions:-)

A couple of years ago we were staying overnight at a small marina in
northern Georgian Bay, Lake Huron--an area of pristine fresh water. The
boat in the next slip had an Optimax engine that was running a bit
rough. He departed the slip about 5 p.m.; we stayed overnight. When he
started his engine there was quite a bit of oil discharged into the
water. When I awoke the next morning there was an oily scum line on my
hull that I had to scrub off. Based on this experience there is no doubt
that a two-stroke DFI can discharge unburned oil in its exhaust.