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Thread: Bleed System Alternative?
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04-07-2021, 08:57 AM #16
Yes, when the airflow is so low, the fuel droplets that drip off the reeds don't get picked up by the airstream... they just run down the side of the port to the bleed pickup. At higher rpm (airflow) the droplets should fly right by the bleed pickup in the air rather than running down the port.
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02-13-2022, 11:44 AM #175000 RPM
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Still trying to understand this bleed system. Its puzzling to see different routings on different motors, but my question now is what prevents all the crankcase pressure to just ooze out of that little check valve nipple? Something must control it somehow.
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02-13-2022, 03:34 PM #18
It doesn't matter which side of the reed blocks fuel is injected into the system. It puddles between the reed block and the rod slot.
You have (or want) to evacuate that area by either timed / external hoses or find a way to cut drainage ditch's that run down hill from one side of the rod slot to the other .. which ain't happenin
The bleed lines are 1/8" ID and the fitting inner orifice .. much smaller. The cylinder volume of a typical 3.0L outboard is aprox 500 cc. The crankcase volume is roughly three times that size. A leak .. yes. But you'd be hard pressed to move 1500 cc thru that lil hose on every descending stroke. A non-issue .. they seem to do more good than harm.
Seems like it took em a decade to finally get it right, then they quit making two-strokes ..
Ohhh what a few degrees of drill rotation make :
Don't give em too much credit on the Opti's. They use the same boss that all the previous carb / EFI blocks used. But instead of drilling the bleed line fitting into the transfer port, they missed the port and broke thru the sleeve just below and between the transfer and boost ports into the cylinder. Like any two stroke, there is a hurricane of air moving in the crank case. And while Opti parts seem to look a bit more .. ahh .. colorful, apon inspection, they do get enough oil to survive.
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02-13-2022, 06:16 PM #195000 RPM
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So question relating to the "timing"... For example, in the engines (i.e. carbed) I have been working on lately the bleed lines pair together like this (intake-port): 4-1, 6-2, 5-3, 1-4, 2-5, 3-6. Most of the pairs differ by 180 degrees of rotation, but a couple of them are different, like 120 or 240. Why are they not all consistent?
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02-14-2022, 12:22 AM #20
1 , 3 and 5 are on one side , 2 , 4 and 6 are on the other. Look at it like two individual three-cylinder motors and it will make more sense.
Although .. I think it was the 1999 ish 300pm that tied three together on one side at the reed blocks .. looped under, where it met the other three and only one line went to one transfer on that side (if I remember correctly). Dont matter which one it is, I route them all like a 2005 300x , or just do away with it all together.
Why .. Pppffftttt ... They released some dumb **** on the public over the years. No rhyme or reason for it other than .. let the masses figure it out for us.
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02-14-2022, 11:11 PM #215000 RPM
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So I get that cylinders 1, 3, and 5 are on the starboard bank, and cylinders 2, 4, and 6 are on the port bank.
Also, that a port should be matched up with a reed on the opposite side, but it look like that is not true for #2 and #3. So switching those makes sense to me.
(Port to Reed):
1-4
2-6 (2-5 makes more sense to me)
3-5 (3-6 makes more sense to me)
4-1
5-2
6-3
I may try switching those two and see how well it runs.
...and yeah I saw how some engines connect several of them together, I still think there is hokiness to this system.
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02-15-2022, 06:04 AM #22
On our wet reed race motors we connect all the bleeds together and then run that back to the tank. Just another option.
'95 STV "The Blue Goose"
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02-15-2022, 07:32 AM #235000 RPM
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02-15-2022, 09:19 AM #24Screaming And Flying!
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They are clearing the puddled fuel at the reeds, OMC and Merc same problem same fix
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02-15-2022, 10:06 AM #255000 RPM
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I remember my Dad running the oiler line to the top bearing as someone mentioned earlier in this post. Is that a simple modification to make? anyone have images of such?
STV Pro Comp Ski| 200 Merc
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02-15-2022, 06:42 PM #265000 RPM
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02-15-2022, 08:46 PM #27
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02-16-2022, 04:58 AM #28Screaming And Flying!
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02-16-2022, 07:12 AM #29
Mercury is the same way….check valve let’s the crankcase pressure push it out
'95 STV "The Blue Goose"
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02-16-2022, 08:03 AM #305000 RPM
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