Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - SuperMID calibration methods ? / overinflation valve stem failure

brucepick · 03-30-2008, 12:19 PM

My guess is maybe a bad valve stem was the cause.
Valve leaked causing tire to lose pressure.

I'm not sure if it can go this way but - - -
Pressure loss causes temperature rise which causes heat built up due to expansion of air in tire. This causes increased pressure - until the rubber fails, then you lose the pressure.

I found a pressure gauge rated accurate to +/- 1 psi. From Accu-Gage company in Ohio or thereabouts, brass case, dial gauge. I found them by a web search so that works - but I bought it locally. Now made in China but they still say accurate +/- 1 psi. Nearly $15 but money well spent.

03-30-2008, 12:19 PM	#4 (permalink)
brucepick OCD Master EcoModder Join Date: Dec 2007 Location: Eastern CT, USA Posts: 1,936 Outasight - '00 Honda Insight Team Honda Gen-1 Insights 90 day: 54.18 mpg (US) Thanks: 431 Thanked 396 Times in 264 Posts	My guess is maybe a bad valve stem was the cause. Valve leaked causing tire to lose pressure. I'm not sure if it can go this way but - - - Pressure loss causes temperature rise which causes heat built up due to expansion of air in tire. This causes increased pressure - until the rubber fails, then you lose the pressure. I found a pressure gauge rated accurate to +/- 1 psi. From Accu-Gage company in Ohio or thereabouts, brass case, dial gauge. I found them by a web search so that works - but I bought it locally. Now made in China but they still say accurate +/- 1 psi. Nearly $15 but money well spent. __________________ Coast long and prosper. Driving '00 Honda Insight, acquired Feb 2016. Last edited by brucepick; 03-30-2008 at 09:06 PM..