Home › Forum › Ask A Member › Unburned Fuel collection
- This topic has 28 replies, 16 voices, and was last updated 8 years, 7 months ago by
amuller.
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August 15, 2017 at 10:30 pm #63178
There are reed valves, which I removed for pictures sorry. They screw on the other side of those filters. Allow fuel/oil out, but nothing in.Not a dumb question at all!
August 16, 2017 at 12:20 am #63189The tubes leading to the reeds are of a precise diameter to allow just so much to escape. Since they are the same diameter both crankcases leak equally.
August 16, 2017 at 2:08 am #63198Wayne,
Yes, one motor can shut down and tilted up while underway with this set up.
I just lucked out while looking through some of my sailboat gear and found this old bronze & stainless turnbuckle with rotating joints at each end rather than ridged eyes or forks.
Very pleased about how that worked out.
Pays to keep old junk around around sometimes huh?August 16, 2017 at 2:18 am #63200amuller,
Sorry no experience with the V-4’s…..yet.
One 60 hp waiting in my barn for it’s wake-up call though!August 16, 2017 at 2:20 am #63202Thanks to all for the interesting input and experiences,Bill.
August 16, 2017 at 2:29 pm #63220Actually, the pressure loss is very small, and happens whether the conversion is made or not. The only difference is where it goes
August 16, 2017 at 4:16 pm #63229Boy, I like the idea of converting to fuel pump and using the pressure line as a fuel return line to the tank. This is testing my resolve to keep my engines as original as possible.
August 16, 2017 at 8:30 pm #63243Anonymous
Frank, I was trying to figure who you were replying to about pressure drop.
Also, anyone heard of doing this conversion to a green tank Mercury?
Kirk
August 17, 2017 at 12:59 am #63272IN 1967 the government did testing in FLA a 40 hp OMC was used it had 40 % plus unburned fuel loss overboard the US gvt passed a law as a result of the testing requiring the outboard mfg to recirculate unburned fuel no overboard dump by 1969 so anything prior dumps fuel that can be recovered I did a test on a 58 fat fifty I had heard that a 6 gal tank was gone in 20 mins at idle or WOT at 1500 by my calculations it was true I plugged off the overboard dump and ran the scavenge into a container I calculated a very rough 55% unburned fuel loss
August 17, 2017 at 3:26 am #63281There is loss from the crankcase drains, and there is loss from the cylinders themselves–mixture mixing with exhaust. Are we talking both here, or only the drains?
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