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 Hypermiler Join Date: Dec 2007 Location: Eastern CT, USA Posts: 1,070 Lean Burn Civic - '97 Civic HX Team Honda 90 day: 51.92 mpg (US) Thanks: 78 Thanked 87 Times in 63 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. __________________ Check your tire pressure - keep it up !! We've learned that diet has a closer relationship to cancer than we ever thought. Please see this Wikipedia article on The China Study. Driving Lean Burn '97 Civic HX, lotsa mods by now! '89 Volvo 240 is semi-retired. I did love that car though! Last edited by brucepick; 03-30-2008 at 09:06 PM..