is there any difference in measuring oil and water temp? surely they both will pretty much give u the engine temp which is what one wants. _________________ 94 mc28 SE
Oil temp wont tell you much as the gearbox is completely seperate. _________________ If you dont like the way that i ride.....Stop trying to keep up!!!!!
Depends. Water temp is more accurate since water reacts to temp changes much quicker. You're right in that the oil will take longer to reach 'normal', but it will also take longer to reflect and change up or down.
Oil is also designed to work effectively over a large range these days, so even though it's not fully warm, it's still protecting.
Oil is also not pumped round the head to cool it, whereas water is. The water should be hotter as that's what cools the combustion chamber.
Basically, water temp is the crucial one! _________________ MC21SP Plaything
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Dave Ett wrote:Depends. Water temp is more accurate since water reacts to temp changes much quicker. You're right in that the oil will take longer to reach 'normal', but it will also take longer to reflect and change up or down.
Oil is also designed to work effectively over a large range these days, so even though it's not fully warm, it's still protecting.
Oil is also not pumped round the head to cool it, whereas water is. The water should be hotter as that's what cools the combustion chamber.
Basically, water temp is the crucial one!
Quick science lesson - Actually Dave it's the opposite - I think you'll find that Oil will warm up ("react to temp changes" as you say) much faster than water as the Specific Heat Capacity of Oil is about half that of liquid water ie. It takes twice as much energy (Joules) to heat water by the same amount as oil.
The water probably does heat up quicker in the case of a l/c 2-stroke though as it is being pumped around the heat source (cylinders) while the gearbox oil is warmed more slowly by conduction through the engine.
I think you're right re. water temp being more important though - this will tell you if the piston / cylinder area is warmed up sufficiently - afterall this is where the vast majority of 2 stroke failures occur.
Sorry if the post was a bit nerdy. I'm a chemistry graduate thinking about going into teaching so couldn't resist.
I liked the post! Then again, as people often like to remind me, I'm a geek!* I do like to see the more technical discussions here on this Forum though.
*I imagine Fontyyy found it interesting too! _________________ Andy.
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You ruined that last post with the extra comment in parentheses! I'd have appreciated, "Though I was for most of it..." - much more subtle! _________________ Andy.
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Its more about dead-time really rather than heat transfer... hey all the engineering training in the world can't help me shoe-horn an '18 loom into a '16, but thats another thread _________________ '87 MC16
ahug030 wrote:
Its more about dead-time really rather than heat transfer... hey all the engineering training in the world can't help me shoe-horn an '18 loom into a '16, but thats another thread
Best send it all to me then, and I'll use it instead of the PGM-III stuff I have for the MC16 project!! _________________ Andy.
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Andy, is it feasible to do this? I just bought a pgm-2 loom for a decent price and a set of '18 carbs. I checked it out last night, in some places the connectors are just different but wires (at least their colours) are the same, but in others the two looms don't seem to be analogous... _________________ '87 MC16
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- Actually Dave it's the opposite - I think you'll find that Oil will warm up ("react to temp changes" as you say) much faster than water as the Specific Heat Capacity of Oil is about half that of liquid water ie. It takes twice as much energy (Joules) to heat water by the same amount as oil.
