27 Jan 23, 14:12 pm

Recent Posts

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As I get older, I find that I am also richer higher up but weaker lower down  :whistle:
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*Originally Posted by TallyRex [+]
As far as altitude goes, FI cures the problem as it senses the amount of oxygen in the air and adjusts accordingly. Carbs don't do that
I forgot to mention that part. Yes, carbs have no feedback so have to be set up for the relevant altitude the vehicle will see. One of the problems Isle of Man TT racers used to have was the difference between sea level at Douglas and the road over Snaefell. They could only go for an average setting so the bikes would run a bit rich on the Mountain stretches and a bit weak lower down.
Keith
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As far as altitude goes, FI cures the problem as it senses the amount of oxygen in the air and adjusts accordingly. Carbs don't do that
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Atmospheric conditions is a bit too broad a term, IMO. Air temperature would be better and clearer. Oil viscosity changes with temperature so in every circumstance it thins as the engine temperature rises. Modern oils have additives to combat this so the 10-40 designation effectively means that it has the same properties as a straight 10 oil when cold and a straight 40 when hot.
The engine has to turn over at a certain, minimum speed to start so oil drag when cold matters. Back in the dim and distant, when single viscosity oils were still a thing, my old single had to be changed from 50 to 30 for winter or the kickstarter would struggle to get it to that minimum speed. Likewise with a modern bike but now it's a combination of the power of the starter motor and the battery capacity. Will the bike start before the battery is flattened? Changing to a lower viscosity oil helps that. The actual starting viscosity will be similar to that of the 'summer' oil's because the nominal ratings will be set at a standard, lab temperature. That the upper stated viscosity is probably lower in winter isn't likely to damage the engine because if the weather's that bad (a) you won't be pushing the engine and (b) the engine temperature will be kept lower by the colder air drawing extra heat away.
Hope this helps.
Keith
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Mods and Appearance / Re: Black Widow Exhaust headers - photos!
« Last post by Nibis on Today at 04:12:21 am »
Well, I always say go big, or go home, so I ordered a full black widow set up and the stacks for the air box. It's supposed to get up to 50 on Saturday, so I'll get that ECU out and off to Steve on Monday. Just need to make the decision on the wheelie control.
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Accessories and Products / Re: brake pads EBC
« Last post by burchy on Yesterday at 07:13:41 pm »
Ok I stand corrected.  Pictures I was shown must have been "generic"
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Accessories and Products / Re: brake pads EBC
« Last post by Claude on Yesterday at 06:30:25 pm »
*Originally Posted by burchy [+]
Both pads are the same overall shape.  The only difference I can see is that one has a groove down the centre, the other hasn't
Wrong. Picture below is from EBC catalog.

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Accessories and Products / Re: brake pads EBC
« Last post by burchy on Yesterday at 06:03:08 pm »
Both pads are the same overall shape.  The only difference I can see is that one has a groove down the centre, the other hasn't
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I was checking the user's manual for the engine oil then I saw this sentence: "Although 10W-40 engine oil is the recommended oil for most conditions, the oil viscosity may need to be changed to accommodate atmospheric conditions in your riding area." There is also a table showing what kind of oil to use under different temperatures. But it only shows the temperature. Nothing else, yet, they say "atmospheric conditions", not "temperature". Are there any other conditions to worry about when it comes to engine oil choice? (like atmospheric pressure based on altitude).

PS: I'm asking this question because a friend of mine had an old car. It stopped working properly after he traveled to a city at a lower altitude. A service guy had to adjust the carburetor to make it run again. Maybe the engine oil also gets affected by the altitude?
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