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Post by Tobyjugs on May 16, 2015 18:23:08 GMT 1
I am lucky enough to have two LC's one runs on premix and the other uses the oil pump. I have been playing around a lot with the premix engine so have regularly seen the inside of the carbs and block etc. Yesterday i was doing some maintenance, on the other and noticed a long trail of oil coming out the carb and into the engine. This got me thinking about the different ways the engine gets lubricated.
If oil used in the injection system is not mixing so well, i would expect more hangs around the main bearings and big end bearings.
With premix it gets spread all over the place as it totally mixed with the fuel, dare i say it, more cylinder and small end bearing lubrication?
At the end of the day it all goes out the pipe.
What are your thoughts on this???
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Post by 4l04ever on May 16, 2015 18:45:28 GMT 1
I run premix on all my bikes. Less to go wrong. Easier to work on the bikes.
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Post by alistair64 on May 16, 2015 19:01:13 GMT 1
I run premix on all my bikes. Less to go wrong. Easier to work on the bikes. Agreed. You only need one engine to seize due to an airlock in the pipe to go off the idea of using the pump for good! It was an RS100 many years ago, but still very costly to repair. I always kept the tank topped up, so no idea how it got there. |
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Post by arrow on May 16, 2015 19:03:08 GMT 1
My thoughts are premix is a compromise, its not correct for all speeds and loads. If you want to oil the motor correctly at full bore then use 20:1, but you will have to live with the smoke when pottering around. Premix is old hat, goes back to the times before big companies got a load of engineers together to develop a much better all round working system. Just my opinion.
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Post by steven on May 16, 2015 19:08:05 GMT 1
Hi,
I run premix too, I have seen with my own eyes what happens when a pump fails.
There are enough things that can go wrong with a 35 year old bike, I see removing the pump as one less thing to concern my self with when out and about on it.
steven.
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Post by Tobyjugs on May 16, 2015 19:10:40 GMT 1
I agree that injected is better at metering the oil out at the correct rpm. Just fitted overhauled pump to engine. The cable was found to be frayed, The last check 2 months ago cable was ok. Thats what maintenance is for Ha Ha.
What do people think about the different ways in which the oil is mixed into the petrol?
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Post by arrow on May 16, 2015 19:18:46 GMT 1
I agree that injected is better at metering the oil out at the correct rpm. Just fitted overhauled pump to engine. The cable was found to be frayed, The last check 2 months ago cable was ok. Thats what maintenance is for Ha Ha. What do people think about the different ways in which the oil is mixed into the petrol? I guess premix has to be more complete mixing 'cos its already mixed. But the contents of the oil tank still end up coming out of the exhaust. |
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Post by Tobyjugs on May 16, 2015 19:22:16 GMT 1
I'm thinking maybe you get more bottom end lubrication before it leaves. I should have made some pictures for people to see.
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Post by arrow on May 16, 2015 19:26:32 GMT 1
I'm thinking maybe you get more bottom end lubrication before it leaves. I should have made some pictures for people to see. Interesting. I can see this being a large thread. |
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Post by Tobyjugs on May 17, 2015 14:03:05 GMT 1
I forgot about the reeds this would break that oil trail up into tiny droplets.
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Post by Delbert on May 17, 2015 19:34:09 GMT 1
some good opinions , I wonder what the percentage of engine failures is for those on premix versus a pump !
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Post by steve h on May 17, 2015 21:47:34 GMT 1
I wonder how many engine failures can be attributed to a correctly set up, fully serviceable pump.
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Post by arrow on May 17, 2015 23:59:59 GMT 1
I wonder how many engine failures can be attributed to a correctly set up, fully serviceable pump. Not many I would have thought Steve. What might be a good idea is to go back to piston port and non power valve motors. No chance of a reed petal breaking up or a servo motor failure... More complexity requires more maintenance, but we strive for more complexity. Look at the Cars we are driving now compared to 30 years ago, we moan when a sensor goes down but its OK to produce 170 bhp and do 50 mpg. Wandering a bit of topic there, sorry. |
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Post by bare on May 18, 2015 4:01:14 GMT 1
My Pumps work Fine.. no complaints whatsoever.
However I also add in ~2/3% oil to the fuel.
Admittedly a bit of a PITA but it works for me.
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Post by wolfboy1 on May 18, 2015 6:53:44 GMT 1
owned and ridden a few 2t's over the last 10 year's all on pump , only trouble i've had is an oil line come adrift on my rgv 250 , about 10 miles after a top end rebuild .................... BANG  |
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Post by arrow on May 18, 2015 7:26:10 GMT 1
My Pumps work Fine.. no complaints whatsoever. However I also add in ~2/3% oil to the fuel. Admittedly a bit of a PITA but it works for me. Wow, that's oily! At 2.5% extra added that's about 13.3:1 at full bore with the pump as well. Happy days. |
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Post by wallcraft on May 18, 2015 19:56:37 GMT 1
I used to run pre- mix on my tuned 4lo, what a pain in ass that was being shackled with mixing and thinking what if I run out here or there!
Arrow came to rescue with his uprated production pump. So with with new cables and pump and 1200 miles of thrashing I'm more
than happy.
In this day and age for what we do on the roads with modern oils and a uprated oil pump, for me it's a win win.
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