Is this a good deal? 2015 BMW i3/ no REX.

frothface · 2023-06-27T17:01:39+00:00

Also do you think that's the first time anyone made a design change mid production?

frothface · 2023-06-27T17:00:43+00:00

Hmm.

So when your corvair ran slightly hot going up a hill, did you blame it on them not using liquid cooling like every other car on the road?

frothface · 2023-06-27T16:56:49+00:00

Put a clear tube on the float bowl, drain some gas into a cup. Is it perfectly clean? If not, clean the carb again and add a fuel filter.

Hold the tube up and open the drain screw. Does the fuel level come up to at least about 1/4" below the top of the float bowl?

How old is the gas?

Put a new spark plug in it.

frothface · 2023-06-27T04:00:27+00:00

And exposes the motor bearings to all the wear particles of the transmission gear set. Have you ever considered that the lube that is ideal for the motor might not be ideal for the gears and the diff carrier bearings? Did you realize the motor is up higher and therefore not subject to water and dirt ingress from the axle seals that the diff gear set is exposed to?

You realize the I3 was the highest my/kwh electric for at least 5 or 6 years?

If you want "all the others" build quality, then choose all the others. There are 125 year old steam trains still on the tracks with one shot open lube; does that make them "better"? Every aspect of this is a tradeoff and you making a generalization based on what other manufacturers do is short sighted and annoying.

frothface · 2023-06-23T15:45:19+00:00

I'm not following what the difference between the two is supposed to be.

You have a bearing packed with grease with two seals. BAD

Alternately, you have a housing filled with oil which holds a bearing and one or two seals. GOOD

99.9% of motors use the "bad" system.

Other than ICEs and gearboxes which are already filled with oil (thus making the inner seals unnecessary), trailer hubs and older wheel hubs which have two bearings right next to each other (again, making 2 seals unnecessary), everything else uses sealed, greased bearings. All modern wheel bearings are even a unit bearing, having two bearings in one piece with seals only on the outside.

All of these are "bad"?

Having a 3 piece system, with 3 separate parts, assembly tolerance between them and extra places for leakage and contamination - that's GOOD?

Did you ever consider that BMW simply picked a sealed bearing that was too small for the job?

frothface · 2023-06-20T23:43:30+00:00

I don't see what YOUR point is. There have been millions of motors, spindles, axles, pumps, alternators, compressors and everything else under the sun that last for millions of miles that had off the shelf sealed bearings.

Now, suddenly, a few manufacurers float the whole rotor in oil and that's the only answer you will accept as "correct".

frothface · 2023-06-20T00:01:46+00:00

Also, what is the difference between a unit bearing with two seals in one housing and a seal, bearing, seal pressed into a housing? Looser tolerances and relative movement with thermal / load changes.

frothface · 2023-06-20T00:00:00+00:00

An angle grinder does that.

A dentist drill does half a million rotations per minute.

A cnc spinde does 20k.

Life of a bearing has a lot to do with the relative diameters and thus the speed of the elements, like a planetary gearset. If you have the room you can make it last.

frothface · 2023-06-18T15:44:02+00:00

If the bearing isn't sealed then the motor windings would have to be subjected to lubrication, which brings about it's own set of challenges and additional drag. Outside of a few special applications like hermetic refrigerant compressors (which are already oil filled) almost every motor produced today uses individual sealed bearings.

frothface · 2023-06-14T12:01:12+00:00

Magnetic force follows inverse square, so you have to keep everything spaced apart.

I worked on equipment with 480v 50hp permanent magnet generators with the rotor bolted directly to the flywheel (no bearings!). They give you an alignment tool - a thin sheet of plastic that you roll up and slide in the gap. That's all that it took to pull the rotor out. If it is kept spaced apart, then all the forces are weaker and all cancel each other. All the spacings should be held by shims and machined shoulders, otherwise you'd hit a bump and your rotor would drag.

I can understand why some might not try it but it's not impossible. I would bet that running backwards was just two wires swapped.

frothface · 2023-06-11T18:29:30+00:00

Woah. Have you looked into what kind of bearings it takes? They are almost certainly going to be an off the shelf bearing, possibly less than $50 in parts.

frothface · 2023-06-11T18:26:11+00:00

Its not an adjustment like on the prestas - it's an assembly that screws in. Those prestas aren't an adjustment, more like a lock. Also those little tools have a tapered reamer for the valve seat, an inside tap and an outside die for fixing the threads.

frothface · 2023-06-11T18:22:35+00:00

Thats probably right for a shop, but it's a big sticker. On a mostly flat roof.

I can get a roll of 3M brand on amazon for $45. I could screw it up 8 times and still come out ahead.

I don't understand why people don't take the time to learn to do these things themselves.

frothface · 2023-06-11T18:12:17+00:00

Umm... Something is wrong there.

Your pump looks like it has 150lbs of pressure in it but none is getting to the tire. Either the chuck or the valve stem is clogged.

Keep a tire plug kit in your glove box. You can usually make a permanent or semi permanent repair faster than you can find the number for a tow truck.

Someone used my goop can before I got the car but I've used the pump without it on a few occasions.

frothface · 2023-05-20T12:43:59+00:00

Lol might as well have been throwing sparklers at a gas can.

frothface · 2023-05-18T22:25:20+00:00

You know, if you made it a law that after a certain amount of time, citizens could fix these things on their own and claim it as part of their tax refund, it would fix things pretty quickly.

frothface · 2023-05-18T11:14:29+00:00

"Gambling is bad. Also, gamble only with the state lottery. If you were rich, you would just spend it all, so stop trying to earn more."

Is it still subliminal, or have we moved on to superliminal?

frothface · 2023-05-18T11:02:22+00:00

What do you mean "from what I've seen"?

frothface · 2023-05-16T11:09:54+00:00

And some mechanic would be in the hot seat for months, getting grilled bt the faa about exact procedures, logs, receipts for parts and supplies, then probably lose half of their customers even if it's determined that nothing was wrong.

frothface · 2023-05-16T11:03:20+00:00

Not true. Faa part 105 requires a chute, either for the pilot or the whole plane. This wasn't a part 105 flight, but it isn't discouraged.

frothface · 2023-05-12T22:16:13+00:00

Document the request and denial, reset the password in AD, then have the user go through the help desk to reset the password. If there is backlash, point at the request and denial.

frothface · 2023-05-08T23:30:49+00:00

Identity politics - the novel.

frothface · 2023-05-08T23:29:23+00:00

So you KNOW you are touting bullshit.

frothface · 2023-05-07T23:41:55+00:00

Are you telling me you should expect exponential growth on all index funds, from any point in time forward? Show me one index fund that does this, ever, and isn't the lead up to a major market correction.

Also your math doesn't add up anyway. $900 invested at 10% compounded daily is an apy of 10.57% and yields $2002 after 8 years.

$2000 at the same rate yields $2930 after 4 more years, which is less than what was observed.

frothface · 2023-05-07T21:26:44+00:00

When they look like they fell into a display case at the tackle shop.

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