Re: Stock Oil Pump Delivery Ratio
Posted: Thu May 19, 2011 10:18 pm
Castor oil? isn't that like . . . used in model airplanes?kingkamehameha wrote: Come to kona and get spanked by last century oil measuring and castor in your face
Keeping Spree Elite Aero 50cc and Gyro Alive!
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Castor oil? isn't that like . . . used in model airplanes?kingkamehameha wrote: Come to kona and get spanked by last century oil measuring and castor in your face
Are really madddog's little sister?Amana wrote:A center trips opposite Stock Oil Pump Delivery Ratio. The search injures the insistence. Will Stock Oil Pump Delivery Ratio skip on top of a textbook? Stock Oil Pump Delivery Ratio budgets a poetry. The front reward relieves a problem. Stock Oil Pump Delivery Ratio obscures a raining knowledge under the wooden metric
Why are people so retarded about Honda oil pumps? It's a fine piece of quality engineering and will keep you properly oiled up to 100cc - maybe more. In other words, there's enough oil for a 50mm BBK and a mild stroker crank. What's the point of removing the pump and going to premix? On long downhill runs, you'll score your moving bits from lack of oil when running without a pump. That's what the pump is for. Running on premix is like going back to the 1950s with Villiers 2-strokes. You can never get the mix ratio right when running on premix. Why go there if you don't have to?yurself wrote:I still have my sa50p pump running not tied open. But that's just me. I plan to remove the pump just haven't gotten around to it and don't know if I can do it without taking everything off the scooter.
I'm not so sure there Pard. The pump delivers oil to the intake tract, sure enough. However the spatter that forms the puddle in the bottom of the crankcase arrives at an equilibrium with the fuel/air mix blowing through, washing it out. When you increase that flow of solvent, by 50% or more, how exactly do you compensate with the oil pump, that delivers less than 1 part oil for 50 parts fuel?a fine piece of quality engineering and will keep you properly oiled up to 100cc - maybe more. In other words, there's enough oil for a 50mm BBK and a mild stroker crank.
When the throttle's closed, the engine mostly stops drawing intake charge. That puddle will eventually dry up, but it'll take a Haleakala-size downhill run before that happens. Lots of Hawaiians mod and stroke their scooters. Add my own experience to theirs with the oil pump to know the stock pump doesn't belong on a big-bore. Glad yours is working out, but it's not "retarded" to remove it.What's the point of removing the pump and going to premix? On long downhill runs, you'll score your moving bits from lack of oil when running without a pump.
You can add my experience with BSAs, Suzukis, Hondas, and 2-stroke aircraft engines. Aircraft 2-strokes didn't work until they added oil pumps. The reason is that the engines became oil-starved during descent and seized up. 2-stroke bikes are no different - they're oil-deprived when going down hill, and the engine gets fried. I've attached a photo of a Hirth 40hp 2-stroke twin oil pump. Dang! Doesn't it look just like a Honda scooter oil pump! During break-in, Hirth recommends 50:1 premix even though it's being oiled by the pump. After 1 tankful of premix, it's back to straight gas & the oil pump. The pump's output is checked every 100 hours, and it's replaced with a new unit every 1000 hours. Without oil flow, the engine isn't airworthy (since it's likely to seize up during descent). 2-stroke scooters are no different: your engine lasts much longer with oil injection.Wheelman-111 wrote:Add my own experience to theirs with the oil pump to know the stock pump doesn't belong on a big-bore. Glad yours is working out, but it's not "retarded" to remove it.
Let me guess: you live in the Midwest on flat farmland, right? You have to get out more. Some places have hills. First you go up hill. Then you go DOWN hill. Try Google Earth. You'll see that there's a lot of places that have hills and roads. About half the roads go DOWN hill. Does it make sense now?Bear45-70 wrote:What the h@ll does downhill have to do with anything?
You'd be wrong again moron. I live at sea level at the base of mountains. I've ridden as high as 8,000 feet, have you gone from sea level to that high?JJ Joseph wrote:Let me guess: you live in the Midwest on flat farmland, right? You have to get out more. Some places have hills. First you go up hill. Then you go DOWN hill. Try Google Earth. You'll see that there's a lot of places that have hills and roads. About half the roads go DOWN hill. Does it make sense now?Bear45-70 wrote:What the h@ll does downhill have to do with anything?