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saw a little red sportscar (unsure of make, it was a convertible and really small, think it was british) sitting on the side of the street with a lower balljoint that had thrown in the towel. Must have hit some of the potholes in the previous intersection, it's a pretty ugly one. I suspect it was more of a horrible mechanic failure than a horrible mechanical failure, the guy said he'd never replaced the balljoints in the 15+ years he'd owned it.
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Nov 30, 2011 18:12
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KozmoNaut posted:It's also completely irrelevant for anything other than high-end racing series. The only way to pump in the moisture is to use a direct pump like the 12v cigarette lighter plugin deals. Any system that uses a tank is going to have a moisture trap and dry air performs almost identically to nitrogen, since it's already 78% nitrogen. I would say nitrogen is a scam unless you're in an aircraft.
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Nov 30, 2011 21:41
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Pure (I think) nitrogen gets used in F1 tyres to reduce the amount of tyre pressure change with temperature, presumably because pure nitrogen has a slightly higher specific heat than air. If you're not an F1 team there's probably not a whole lotta reason to use nitrogen except to empty your bank account a bit faster.
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Nov 30, 2011 22:25
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Mr.Peabody posted:The only way to pump in the moisture is to use a direct pump like the 12v cigarette lighter plugin deals. Any system that uses a tank is going to have a moisture trap and dry air performs almost identically to nitrogen, since it's already 78% nitrogen. I would say nitrogen is a scam unless you're in an aircraft. I'm using one of these cheap foot pump dealies, so I'm filling my tires with however humid air is around me at the time. Doesn't seem to affect anything.
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Nov 30, 2011 23:23
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some texas redneck posted:A broken CV joint would just result in the car coasting to the side of the road, possibly with chunks of the joint or bearings hitting the road. If it's a 2000 Lexus it's almost definitely a lower ball joint failure. Unfortunately they can fail by 75k miles, so you can find plenty of horror stories on the Lexus forums.
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Nov 30, 2011 23:47
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In Formula 1, Ferrari actually used HFCs (R404a) and CO2 in their tyres for a while for improved heat transfer from the tyre to the wheel. I think it might actually be a form of phase change cooling, with the freon evaporating from the inside surface of the tyre and condensing on the rim. http://formula-one.speedtv.com/article/speedtvcom_exclusive_f1_racecar_engineering--secrets_of_the_f2007 I give it 5 more years until it catches on as an optional extra. Ballcock fucked around with this message at 01:02 on Dec 1, 2011 |
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Dec 1, 2011 00:58
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KozmoNaut posted:I'm using one of these cheap foot pump dealies, so I'm filling my tires with however humid air is around me at the time. Doesn't seem to affect anything. The compressor I use for filling the tyres on everything is built from old truck parts. I doubt it does much in the way of moisture trapping. No problems here.
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Dec 1, 2011 01:09
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KozmoNaut posted:It's also completely irrelevant for anything other than high-end racing series. It doesn't even have to be high-end. Tire pressures will vary greatly in any racing, and anything helps. For someone doing track days or even SCCA/NASA type amateur racing, you could be qualifying in the chilly early morning under cloud cover, and racing just after noon when the sun hits the pavement and everything gets sweltering.
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Dec 1, 2011 02:45
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SNiPER_Magnum posted:It doesn't even have to be high-end. Tire pressures will vary greatly in any racing, and anything helps. For someone doing track days or even SCCA/NASA type amateur racing, you could be qualifying in the chilly early morning under cloud cover, and racing just after noon when the sun hits the pavement and everything gets sweltering. Dude that ran the Dunlop truck around here pretty much said straight up (to a large group of customers) unless you're running top of AMA then it's not going to make a difference.
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Dec 1, 2011 03:20
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Ballcock posted:I give it 5 more years until it catches on as an optional extra. ...or until ricers figure out a way to fill their tires with R134a refill cans from Autozone.
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Dec 1, 2011 04:01
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SNiPER_Magnum posted:It doesn't even have to be high-end. Tire pressures will vary greatly in any racing, and anything helps. For someone doing track days or even SCCA/NASA type amateur racing, you could be qualifying in the chilly early morning under cloud cover, and racing just after noon when the sun hits the pavement and everything gets sweltering. Yeah, this and that. If you check and adjust your tire pressures regularly, you're not going to see a benefit from nitrogen. Unless you check your tire pressures annually, or you're driving an actual race car, you can get as good a performance as by just checking and adjusting your tires 4 times a year.
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Dec 1, 2011 05:21
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some texas redneck posted:A broken CV joint would just result in the car coasting to the side of the road, possibly with chunks of the joint or bearings hitting the road. When the front right CV went out on my Subaru, that's pretty much exactly what happened. That was the day I found out that the vehicle speed sensor is attached to the drivetrain before it connects to the wheel, so my speedo said I was going 85mph when I was pretty clearly running about 85mph less than that. But yeah, no smoke or wheels exploding or anything like that, just a nice leisurely slowdown accompanied by horrific grinding noises from the right side of the car and horrific swearing from my mouth. Ballcock posted:In Formula 1, Ferrari actually used HFCs (R404a) and CO2 in their tyres for a while for improved heat transfer from the tyre to the wheel. I think it might actually be a form of phase change cooling, with the freon evaporating from the inside surface of the tyre and condensing on the rim. Street racers will call cars with it "Hella Iced" and there'll be all sorts of web forums devoted to how many BHP you get for every degree the temperature in your tire drops. Then Weapon R will start selling blue billet aluminum valve caps that say "ICE" on them, "for an aggressive performance look sure to impress and intimidate."
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Dec 1, 2011 08:00
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Skyssx posted:Yeah, this and that. If you check and adjust your tire pressures regularly, you're not going to see a benefit from nitrogen. Unless you check your tire pressures annually, or you're driving an actual race car, you can get as good a performance as by just checking and adjusting your tires 4 times a year. 4 times a year is probably a bit too lenient. I check mine every couple of weeks and I usually have to add .1 bar or so. That could add up over a three-month period.
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Dec 1, 2011 12:01
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Rujo King posted:When the front right CV went out on my Subaru, that's pretty much exactly what happened. That was the day I found out that the vehicle speed sensor is attached to the drivetrain before it connects to the wheel, so my speedo said I was going 85mph when I was pretty clearly running about 85mph less than that. But yeah, no smoke or wheels exploding or anything like that, just a nice leisurely slowdown accompanied by horrific grinding noises from the right side of the car and horrific swearing from my mouth. That sounds much more laid back than my subaru. I've had an axle seize. That makes horrible voilent drivetrain shaking and apparently breaks your pitch stopper bracket.
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Dec 1, 2011 12:46
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KozmoNaut posted:4 times a year is probably a bit too lenient. I check mine every couple of weeks and I usually have to add .1 bar or so. That could add up over a three-month period. You have a slow leak, probably at the bead. My v70 needs 2 psi every week or so on one wheel, I submerged it in a kiddiepool & found the leak, but it needs a new or refurbished wheel and 
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Dec 1, 2011 13:41
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Cakefool posted:You have a slow leak, probably at the bead. My v70 needs 2 psi every week or so on one wheel, I submerged it in a kiddiepool & found the leak, but it needs a new or refurbished wheel and
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Dec 1, 2011 14:04
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Geoj posted:...or until ricers figure out a way to fill their tires with R134a refill cans from Autozone. It'll get even better when they learn that propane is a better refrigerant.
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Dec 1, 2011 14:56
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Cakefool posted:You have a slow leak, probably at the bead. My v70 needs 2 psi every week or so on one wheel, I submerged it in a kiddiepool & found the leak, but it needs a new or refurbished wheel and It's always been like that, on three different sets of tires and two different sets of wheels. Both the original tires on steelies, winter tires on steelies and summer tires on alloys do it. But oddly enough, even after having been stored all winter (4 months), the winter tires had only lost .2 bar.
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Dec 1, 2011 16:01
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InitialDave posted:It'll get even better when they learn that propane is a better refrigerant. I can't wait for this to become a thing. Someone alert the Darwin Awards.
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Dec 1, 2011 16:17
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stump posted:Pah, one wheel on my E46 does down from 35psi to 15 in a week or so! Thank god I'm putting my winter tyres on this weekend, and my summer wheels are getting new rubber in the new year. the rear right tire on my red jeep will go from 50psi to 10 in a matter of days... I know it has something stuck in it but I can't find it, and it's a nearly worn out stock tire anyways. When I have some time I'm gonna throw one of the ones from the yard on it. Till then, I pump it up every few days (I only fill it to 50 so it lasts a day or two longer, it's supposed to get 35psi.) I really hate that one, depending on what day it is I'm either in the 'gently caress working on this stupid thing' mood or the 'whip it till it dies and then junk it' mood. Now that I think about it, they're basically the same.
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Dec 1, 2011 16:18
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GnarlyCharlie4u posted:I can't wait for this to become a thing. Someone alert the Darwin Awards. Mercedes has done it for a long time. Propane, Propene, Propylene, Butane, and Isobutane make great refrigerants. Not particularly dangerous, considering there's a tank of several gallons of hydrocarbons behind the driver already... What harm in a few more ounces up front?
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Dec 1, 2011 16:29
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...at 30-100 psi. I'd probably still do it though.
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Dec 1, 2011 16:32
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GnarlyCharlie4u posted:I can't wait for this to become a thing. Someone alert the Darwin Awards. It's is a thing, and it's not particularly dangerous at all. Most of the R12 replacements (like Freeze-12) are mostly propane. It's a lovely substitute for R-12, but actually works a bit better than R-134a in the right application. revmoo posted:...at 30-100 psi. Try 200+ when compressed in an AC system. Propane's vapor pressure is 150 PSI at 90F/32C. So your gas grill tank is holding that pressure of propane all summer long. Edit: revmoo wasn't talking about refrigerant pressures at all, now....was he? I'm a dumbass. Motronic fucked around with this message at 16:48 on Dec 1, 2011 |
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Dec 1, 2011 16:40
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revmoo posted:...at 30-100 psi. I too have a persistant leak(someday I'll have it remounted and new valve stem, its one of the two...) and I do the same thing. The plate in the glove box says "32 PSI cold" and SOP for me is 36 PSI "hot" but I fill the problematic one to 40. Sidewall says max inflation 45PSI so I'm not concerned there, and I figure the slight overinflation for part of the mileage evens out the wear for the day or two that its down around 24psi before I top it up again...
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Dec 1, 2011 17:11
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Cakefool posted:You have a slow leak, probably at the bead. My v70 needs 2 psi every week or so on one wheel, I submerged it in a kiddiepool & found the leak, but it needs a new or refurbished wheel and That's a great idea! Thanks dude 
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Dec 1, 2011 18:39
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Motronic posted:It's is a thing, and it's not particularly dangerous at all. Most of the R12 replacements (like Freeze-12) are mostly propane. If I could actually repair the leak in my AC system myself, I'd be tempted to try propane. The volume is probably quite a bit larger than the amount that occasionally does a surprise disassembly of sections of the intake from time to time, but is it really much worse than r134a? I wish I could buy that poo poo off the shelf here. I've seen it in hobby stores but only with the airbrush. It'd be too tempting to get an aircon refill kit into the country a piece at a time to save hundreds of $ whenever the stupid thing shits itself.
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Dec 2, 2011 03:30
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^ I think Motronic was saying propane is lovely as a substitute for R-12. IIRC propane works better than R134a in a R134a system.
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Dec 2, 2011 04:05
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Geoj posted:^ Yes...that. I suck at explaining things sometimes. Propane works somewhat as well as R-12. It works much better than R-134a. So if you put it in an R-134a system (which is that same as an R-12 system with different oil and, more importantly, a larger evaporator and condenser to make up with the inefficiency of R-134a) it kicks rear end. Sometimes too much, and you end up freezing the evaporator. Even better is R-12 in an R-134a system. You can turn your car into a meat locker/reefer truck. As a bonus, Propane will mix with either PAG or POE oils (although POE is a better choice as it's more soluble in that then PAG). Sorry about the refrigeration 'sperge. It's plumbing for nerds, and I got into it several years back. Motronic fucked around with this message at 04:23 on Dec 2, 2011 |
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Dec 2, 2011 04:20
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KozmoNaut posted:I'm using one of these cheap foot pump dealies, so I'm filling my tires with however humid air is around me at the time. Doesn't seem to affect anything. You'll never notice, but the water vapor will expand and contract more than dry air with the temperature change in a tire. So you'll have a larger variation between a cold tire reading and warm tire reading than you would if you used dry air.
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Dec 2, 2011 04:25
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Mr.Peabody posted:You'll never notice, but the water vapor will expand and contract more than dry air with the temperature change in a tire. So you'll have a larger variation between a cold tire reading and warm tire reading than you would if you used dry air. I know, but the difference will be so slight as to not matter at all.
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Dec 2, 2011 10:33
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And as a bonus, the propane will let you know that your AC system is leaking automatically, with its odor-based warning system!
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Dec 2, 2011 11:40
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Actually, consumer-grade propane gas (and friends) is treated with an esther so it smells like "gas". Friend of mine is a chemist, and once the entire lab reeked of gas. They evacuated, until one on the guys thought it over, and realized that a byproduct of whatever he was making was the particular esther that smells like gas. (I'm no chemist, so the details are probably not quite right in this story.)
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Dec 2, 2011 12:27
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Sponge! posted:Mercedes has done it for a long time. Propane, Propene, Propylene, Butane, and Isobutane make great refrigerants. Not particularly dangerous, considering there's a tank of several gallons of hydrocarbons behind the driver already... What harm in a few more ounces up front? I mean in the tires. Please don't tell me that's actually a thing...
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Dec 2, 2011 18:20
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If propane is such a great refrigerant, why don't we use it instead of R-134a?
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Dec 2, 2011 18:29
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grover posted:If propane is such a great refrigerant, why don't we use it instead of R-134a? If I had to guess, the safest solution would be to blend propane with something else, but I don't know what kind of pressures R12 systems run as I've never serviced one. Seat Safety Switch fucked around with this message at 18:36 on Dec 2, 2011 |
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Dec 2, 2011 18:30
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grover posted:If propane is such a great refrigerant, why don't we use it instead of R-134a? It worse for the environment, and holds a lot of water vapor (which makes it a poor choice for the longevity of a refrigeration system). I don't think the "it burns!" parts is really any of it. I've never seen an actual reason from someone official - NHTSA, EPA, etc. But those are the reasons I can think of off the top of my head. Considering Freeze-12 and the other azeotroipc blends have so much propane in them, it's probably not safety related.
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Dec 2, 2011 18:45
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grover posted:If propane is such a great refrigerant, why don't we use it instead of R-134a? Imagine it leaking after a frontal collision on a car that's on fire. Lawyers alone would stop most companies from even trying it commercially.
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Dec 2, 2011 19:20
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Joe Mama posted:Imagine it leaking after a frontal collision on a car that's on fire. Lawyers alone would stop most companies from even trying it commercially. No - that's a feature!. If there's an accident at night, the emergency lighting system automatically deploys...
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Dec 2, 2011 19:24
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There is a remarkably small amount of propane in an ac system, not enough to worry about in a crash.
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Dec 2, 2011 19:53
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Cakefool posted:There is a remarkably small amount of propane in an ac system, not enough to worry about in a crash. Yeah. There are very few things that we could put in a car that are worse than leaking gasoline vapors since they are heavier than air. Hydrogen is even better (since it rises and will generally escape and be diffused.)
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Dec 2, 2011 20:00
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