Hydrocarbons, how clean is your engine?

Chappers 71 · 10-08-2016, 08:16 AM

Had my 335i mot,d today & I have been looking back over the previous emission tests, as the cars got older & the miles have clocked up my HC readings have gone down, I would have thought they would have gone up as the miles increased & the carbon build up to have got worse.

2011 44k HC 26 ppm
2012 58k HC 13
2013 71K HC 11
2014 81k HC 10
2015 90k HC 9
2016 100k HC 2

So I bought the car back in 2011 with a fresh mot, since then I have only used Shell V Power, is the reduction in HC due to the use of V Power petrol?

Would be interesting to know other people's HydroCarbon readings & what fuel used.

sparkymarky · 10-09-2016, 01:48 PM

Mine always reads 0 at mot time. 90k miles. 330d. As far as I know dpf still fitted. Mix of fuel mainly normal diesel with the occasional tank of supreme diesel.

AWSAWS · 10-09-2016, 05:01 PM

Probably due to the increasing content of ethanol in fuels.

The increasing amount of oxygen in the blend (from OH) in alcohols improves the efficiency of combustion. Less unburned hydrocarbons, CO, and more CO2.

Original VPower was ethanol free, now it' probably 5% or a bit more.

An EU directive was pushing for 15% but who knows what will happen following Brexit.

abeardo83 · 10-10-2016, 07:32 AM

Quote:

Originally Posted by AWSAWS

Original VPower was ethanol free, now it' probably 5% or a bit more.

An EU directive was pushing for 15% but who knows what will happen following Brexit.

Hopefully we'll go back to keeping all of the N Sea oil and petrol prices will go down... then we can all go buy v8's

...we can but dream!!

10-08-2016, 08:16 AM	#1
Chappers 71 Major General 5525 Rep 5,440 Posts Drives: Beige G31 40ix m sport Join Date: Feb 2016 Location: Kent, The Garden of England iTrader: (0) Garage List 2018 G31 xdrive 40i ... [4.00] 2006 E92 335i SE [9.50]	Hydrocarbons, how clean is your engine? Had my 335i mot,d today & I have been looking back over the previous emission tests, as the cars got older & the miles have clocked up my HC readings have gone down, I would have thought they would have gone up as the miles increased & the carbon build up to have got worse. 2011 44k HC 26 ppm 2012 58k HC 13 2013 71K HC 11 2014 81k HC 10 2015 90k HC 9 2016 100k HC 2 So I bought the car back in 2011 with a fresh mot, since then I have only used Shell V Power, is the reduction in HC due to the use of V Power petrol? Would be interesting to know other people's HydroCarbon readings & what fuel used. __________________ G31 40ix M Sport E92 335i. E36 328is coupe E39 540i V8 6SP manual E34 3.6 M5. E34 525i sport. VW Jetta Mk2 GTI 16v. 1679cc 1967 resto-cal beetle Last edited by Chappers 71; 10-08-2016 at 01:54 PM..
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10-09-2016, 01:48 PM	#2
sparkymarky Captain 103 Rep 709 Posts Drives: BMW M4 Join Date: Sep 2013 Location: Middle earth. iTrader: (1) Garage List 2006 bmw 330d M Sport [0.00]	Mine always reads 0 at mot time. 90k miles. 330d. As far as I know dpf still fitted. Mix of fuel mainly normal diesel with the occasional tank of supreme diesel.
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10-09-2016, 05:01 PM	#3
AWSAWS Colonel 283 Rep 2,343 Posts Drives: E92 GC Turbos, FBO, 335i DCT Join Date: Nov 2012 Location: Valhalla iTrader: (0)	Probably due to the increasing content of ethanol in fuels. The increasing amount of oxygen in the blend (from OH) in alcohols improves the efficiency of combustion. Less unburned hydrocarbons, CO, and more CO2. Original VPower was ethanol free, now it' probably 5% or a bit more. An EU directive was pushing for 15% but who knows what will happen following Brexit. __________________ GC Turbos, FBO, JB4, DCT, Port Meth injection, BMS Charge Pipe, NGK plugs. EBC brakes and pads, LED Angel lights, LED foglights, LCI rears OCC, Braided brake lines. Custom Diff Lockdown Kit, VTT inlets, TMAP, stage 2+ fuel pump 11.79@119mph (stock turbos) 11.74@129mph (GC Turbos)
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