thcosh Posted December 15, 2020 Share Posted December 15, 2020 On 12/14/2020 at 2:55 PM, Trujillo said: Of course with external gauges, you have to wonder if they themselves are accurate. The day when people will wonder and understand how wrong they think, the world will be full of smart people. Not yet to happen. Link to comment Share on other sites More sharing options...
Andrew Dwyer Posted December 15, 2020 Share Posted December 15, 2020 39 minutes ago, Dante99 said: It is great you check the temp but why is that releveant to this thread about pressure? Just a little test to see if anyone actually reads my posts, thanks for being attentive . ???? 1 Link to comment Share on other sites More sharing options...
jvs Posted December 15, 2020 Share Posted December 15, 2020 1 hour ago, boonchu said: I filled my tyres with nitrogen, 400bt first time after that free top ups. I just drive to the tyre shop where I filled the tyres and get the free tyre pressure check and free top up of nitrogen. Don't even have to get out of the car. Yes they ought to do that after they took 400 baht pressure out of your wallet! You got scammed!At least in my opinion. Link to comment Share on other sites More sharing options...
EVENKEEL Posted December 15, 2020 Share Posted December 15, 2020 Can't be bothered with the air at stations so I bought my own compressor. Only 4500 bht and can be had for cheaper. I don't understand why the service stations have these electronic gismos. 1 Link to comment Share on other sites More sharing options...
Slain Posted December 15, 2020 Share Posted December 15, 2020 I the UK the advice is always check with your on pressure gauge because the petrol station one is probably out due to heavy use. Link to comment Share on other sites More sharing options...
whaleboneman Posted December 15, 2020 Share Posted December 15, 2020 7 hours ago, Dante99 said: It is great you check the temp but why is that releveant to this thread about pressure? Boyle's law? 1 Link to comment Share on other sites More sharing options...
Dante99 Posted December 15, 2020 Share Posted December 15, 2020 4 hours ago, whaleboneman said: Boyle's law? Science is great but you do need to understand when it is applicable and Boyle's Law is certainly not useful in this situation. Link to comment Share on other sites More sharing options...
dingdongrb Posted December 15, 2020 Share Posted December 15, 2020 12 hours ago, EVENKEEL said: Can't be bothered with the air at stations so I bought my own compressor. Only 4500 bht and can be had for cheaper. I don't understand why the service stations have these electronic gismos. I bought one years ago. It's great not just for tires but I use mine to blow out all the dust from my PC and NAS. Link to comment Share on other sites More sharing options...
KhaoYai Posted December 16, 2020 Share Posted December 16, 2020 Service station gauges have been suspect for many years - just blow them up over the required amount and use your own gauge to correct the pressure as you let it out. 1 1 Link to comment Share on other sites More sharing options...
whaleboneman Posted December 16, 2020 Share Posted December 16, 2020 1 hour ago, Dante99 said: Science is great but you do need to understand when it is applicable and Boyle's Law is certainly not useful in this situation. I guess humour not allowed now? But in fact, Boyle's law is applicable and it is why you should check tire pressure when they are cold. Link to comment Share on other sites More sharing options...
Bill97 Posted December 16, 2020 Share Posted December 16, 2020 1 hour ago, dingdongrb said: I bought one years ago. It's great not just for tires but I use mine to blow out all the dust from my PC and NAS. Plus to blow dry your motorcycle, truck and hairy regions. 1 Link to comment Share on other sites More sharing options...
Bill97 Posted December 16, 2020 Share Posted December 16, 2020 1 hour ago, whaleboneman said: I guess humour not allowed now? But in fact, Boyle's law is applicable and it is why you should check tire pressure when they are cold. What does it have to do with variations in the pressure readings on gas station air filling equipment? Our topic Link to comment Share on other sites More sharing options...
trevoromgh Posted December 16, 2020 Share Posted December 16, 2020 On 12/13/2020 at 1:29 AM, Trujillo said: If you go to a gas (petrol) station and put air in your tires, the first reading seems to indicate what pressure is currently in the tire (before the pump starts). So, when you hit your target air pressure -- let's say 32 psi -- the pump beeps and you remove the air chuck from the tire stem. Okay. The tire ought to have the pressure now that you just put in and was recorded on the digital display, right? But if you immediately put the chuck back on the tire stem, the display reads far less (like 27 psi) than it just did when the tire was "full" to the pressure you programed in. Shouldn't the tire read the same as what it just registered immediately after you finished "filling" it? Mystery.... Smile you're going to be on next months "Candid Camera" episode Link to comment Share on other sites More sharing options...
chilly07 Posted December 16, 2020 Share Posted December 16, 2020 If you can hear air going into the tyre it should stay at that pressure. I always check with my own gauge as those tyre towers are often innacurate 1 Link to comment Share on other sites More sharing options...
Trujillo Posted December 16, 2020 Author Share Posted December 16, 2020 Thanks Russell17au for solving this question. It all makes sense now. By the way, I don't know if it's just me but the tires in my car deflate on their own. The tires on my scooter deflate on their own. The tires on my chopper deflate on their own (although not as badly as all the other vehicles). The tires on my bicycle deflate on their own. Paying to put nitrogen in the tires of my car would be silly. Every two weeks I'd have to refill them. 1 Link to comment Share on other sites More sharing options...
GregTN Posted December 16, 2020 Share Posted December 16, 2020 After reading this thread I went to fill my tires at the local PTT and after reaching the desired PSI of 36 I reattached the hose and it was still reading 36. Apparently certain designs of air pumps cause that issue as previously stated. Link to comment Share on other sites More sharing options...
thailandbeachisland Posted December 16, 2020 Share Posted December 16, 2020 1 hour ago, GregTN said: After reading this thread I went to fill my tires at the local PTT and after reaching the desired PSI of 36 I reattached the hose and it was still reading 36. Apparently certain designs of air pumps cause that issue as previously stated. clearly, it has always been like this for me ! I wonder if the OP could understand how wrong he is ?! Link to comment Share on other sites More sharing options...
KhaoYai Posted December 16, 2020 Share Posted December 16, 2020 (edited) 8 hours ago, Trujillo said: Thanks Russell17au for solving this question. It all makes sense now. By the way, I don't know if it's just me but the tires in my car deflate on their own. The tires on my scooter deflate on their own. The tires on my chopper deflate on their own (although not as badly as all the other vehicles). The tires on my bicycle deflate on their own. Paying to put nitrogen in the tires of my car would be silly. Every two weeks I'd have to refill them. If any of those are tubeless (probably only your car), it is very likely a bead leak. That is where corrosion or dirt is causing a leak on the bead of the tyre (where it seals). This is very common on alloy wheels. I have even found a minute crack on an alloy before that was causing a slow puncture - kerbing is the usual culprit. However, on tubed tyres - I had a similar problem with my Honda Scoopy - it seemed to puncture regularly and the tyres deflated slowly in between punctures. I got sick of it and took a closer look at what was going on - it turned out that when I'd had a 'genuine' puncture, the bike shop up the road kept replacing the tubes with cheap rubbish ones. Both back and front tubes were leaking very slowly from the 'rubber weld' where the valve stem is attached to tube. I went to a bike shop and asked if there was more than one quality of tube - there was. I bought a pair of decent quality tubes and I've never has a problem since. In future I'll repair punctures myself. Edited December 16, 2020 by KhaoYai Link to comment Share on other sites More sharing options...
Monkeyrobot Posted December 17, 2020 Share Posted December 17, 2020 Just buy one of those tyre pressure gauges at you local auto store the ones about 6 inches long and look like a pen , I always keep one in my glove box , also always check your tyre when they a cold; those gauges at the gas stations are not that accurate if they have been dropped and un calibrated. Fill you tyre then use the gauge to check against the gas station gauge. Link to comment Share on other sites More sharing options...
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