Mechanical mysteries
Discussion
Done a service on my dad's 1.0 yaris and he's quite happy with it, saved him £40 in labour and also taught him what the jobs of each filter and engine oil do. My dad just adds petrol and goes, knows how to change a spare tire but that's it really.
But it got me thinking
What would happen if...
You don't put on the oil filter?
If you screw on a container so that the oil doesn't filter but recirculates instead?
Put the ignition coil on the wrong cylinders (must be quite stupid to do that it's literally numbered lol)
Have no air filter?
How long could the car drive without an oil pan?
I can do basic maintainance on cars with some confidence, so a yaris I will be happy to do. And I know these questions would be a disaster to the engine but I was just thinking
But it got me thinking
What would happen if...
You don't put on the oil filter?
If you screw on a container so that the oil doesn't filter but recirculates instead?
Put the ignition coil on the wrong cylinders (must be quite stupid to do that it's literally numbered lol)
Have no air filter?
How long could the car drive without an oil pan?
I can do basic maintainance on cars with some confidence, so a yaris I will be happy to do. And I know these questions would be a disaster to the engine but I was just thinking
Ignition leads around the wrong way, spark will not be on compression stroke, you might be lucky to even get it to run, certainly it'll run poorly, stall easily.
Bypassed oil filter - it'll run fine for quite a while I should imagine, but its life would be shortened as debris not caught by the filter moves around the engine and attacks bearings, bores, rings. It'll just run out quicker
No oil pan - it'll run until residual oil dries up, bearings will get hot due to lack of lubrication and start to bind, which will make them even hotter, eventually something will seize and the result won't be pretty.
No air filter, I'd guess that muck ingested would cause premature bore/ring wear. It'll run ok but over time lose power. On a modern engine you'd probably find the air mass meter dies first as it can no longer do its job when coated in muck, especially a "hot wire" type.
Bypassed oil filter - it'll run fine for quite a while I should imagine, but its life would be shortened as debris not caught by the filter moves around the engine and attacks bearings, bores, rings. It'll just run out quicker
No oil pan - it'll run until residual oil dries up, bearings will get hot due to lack of lubrication and start to bind, which will make them even hotter, eventually something will seize and the result won't be pretty.
No air filter, I'd guess that muck ingested would cause premature bore/ring wear. It'll run ok but over time lose power. On a modern engine you'd probably find the air mass meter dies first as it can no longer do its job when coated in muck, especially a "hot wire" type.
Crafty_ said:
Ignition leads around the wrong way, spark will not be on compression stroke, you might be lucky to even get it to run, certainly it'll run poorly, stall easily.
Bypassed oil filter - it'll run fine for quite a while I should imagine, but its life would be shortened as debris not caught by the filter moves around the engine and attacks bearings, bores, rings. It'll just run out quicker
No oil pan - it'll run until residual oil dries up, bearings will get hot due to lack of lubrication and start to bind, which will make them even hotter, eventually something will seize and the result won't be pretty.
No air filter, I'd guess that muck ingested would cause premature bore/ring wear. It'll run ok but over time lose power. On a modern engine you'd probably find the air mass meter dies first as it can no longer do its job when coated in muck, especially a "hot wire" type.
Unless it’s a wasted spark system and you do it just right so it won’t matter if the coils are swapped. Bypassed oil filter - it'll run fine for quite a while I should imagine, but its life would be shortened as debris not caught by the filter moves around the engine and attacks bearings, bores, rings. It'll just run out quicker
No oil pan - it'll run until residual oil dries up, bearings will get hot due to lack of lubrication and start to bind, which will make them even hotter, eventually something will seize and the result won't be pretty.
No air filter, I'd guess that muck ingested would cause premature bore/ring wear. It'll run ok but over time lose power. On a modern engine you'd probably find the air mass meter dies first as it can no longer do its job when coated in muck, especially a "hot wire" type.
Running without air filter depends on the environment I think. Lots of dust will cause engine wear quickly.
Crafty_ said:
No oil pan - it'll run until residual oil dries up, bearings will get hot due to lack of lubrication and start to bind, which will make them even hotter, eventually something will seize and the result won't be pretty.
I suspect that "eventually" will be sooner, rather than later 
Crafty_ said:
I'm surprised the Toyota lasted as long as it did, poor thing. Might just be an old junker but for some reason the wanton destruction annoys me!
To be fair, they did say the same in the video....but still it answers many questions. Although there are plenty of other similar videos too. Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff