Opacity Meaning

Rev Jules · 7th January 2019, 16:04

On my MOT certificate it has figures (Arithmetic average of the Opacity 0.35 m1.
what does it mean.

Rev.

stocktake · 7th January 2019, 16:11

Opacity is the degree to which smoke blocks light, and the basis for measuring the amount of smoke coming from a diesel-powered vehicle. Poorly maintained or malfunctioning engines are sometimes the cause of excessive smoke.

bl52krz · 7th January 2019, 16:15

Hi Jules. It is something to do with the smoke emitted. Opacity is the ability to either ‘see through’ it or not. I think it is a measurement of the smoke that comes with the accelerator being pushed to the floor and whether the opacity (thickness’ of the smoke) is within a certain limit. This is really all guesswork, but opacity is the ability to see through whatever you are looking at like water that is dirty,bonfire smoke and the like.

cengar · 8th January 2019, 15:13

If you look on your info plate inside the door you will see a figure in a box lower left that is the maximum allowed in the smoke test difference between that and MOT figure shows how clean or not. No figure in box then limits are non turbo 2.5 turbo 3.0

7th January 2019, 16:04	#1
Rev Jules This is my second home Rover 75 Tourer+ Join Date: Mar 2011 Location: Radcliffe on Trent Posts: 10,709 Thanks: 7,308 Thanked 3,929 Times in 2,051 Posts	Opacity Meaning On my MOT certificate it has figures (Arithmetic average of the Opacity 0.35 m1. what does it mean. Rev.

7th January 2019, 16:11	#2
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,587 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	Opacity is the degree to which smoke blocks light, and the basis for measuring the amount of smoke coming from a diesel-powered vehicle. Poorly maintained or malfunctioning engines are sometimes the cause of excessive smoke. __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

7th January 2019, 16:15	#3
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,387 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Hi Jules. It is something to do with the smoke emitted. Opacity is the ability to either ‘see through’ it or not. I think it is a measurement of the smoke that comes with the accelerator being pushed to the floor and whether the opacity (thickness’ of the smoke) is within a certain limit. This is really all guesswork, but opacity is the ability to see through whatever you are looking at like water that is dirty,bonfire smoke and the like. __________________ Great Barr, Birmingham. Last edited by bl52krz; 7th January 2019 at 16:16.. Reason: Beaten by another Dave. Cheers Stocktake.

8th January 2019, 15:13	#4
cengar Loves to post rover 75 saloon cdti Join Date: Mar 2010 Location: Trelights Posts: 351 Thanks: 158 Thanked 168 Times in 123 Posts	If you look on your info plate inside the door you will see a figure in a box lower left that is the maximum allowed in the smoke test difference between that and MOT figure shows how clean or not. No figure in box then limits are non turbo 2.5 turbo 3.0