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#1
05-11-09, 20:31
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Flathead CO level at idle.
Hi, Can anyone tell me the correct Carbon Monoxide level at idle to expect on an 8BA flathead running a holley 94 carb. I have set her up using a colourtune, idle speed and timing are spot on but I am running about 6% CO at idle on a hot engine, which I am thinking is a little high.
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2pdr Tank Hunter Universal Carrier 1942 registered 11/11/2008. 3" Mortar Universal Carrier 1943 registered 06/06/2009. 1941 Standard Mk1 stowage Carrier, Caunter camo. 1941 Standard Mk1 stowage Carrier, light stone. 10 cwt wartime mortar trailer. 1943 Mk2 Daimler Dingo. 1943 Willys MB. 1936 Vickers MG carrier No1 Mk1 CMM 985. 
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#2
06-11-09, 00:11
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Crikey thats getting a bit techo isn't it?! Any oil burning or air leaks in the exhaust will upset any readings. 6% is a little on the high side but if its happy there i wouldn't be concerned. About 3% to 4% would be pretty good but old engines, low compression, bad combustion chamber etc. Just wind mixture screws in till it goes off song, then out till same & set screws in middle of that.
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T33285 Mk1 Universal Carrier, Wolseley 1941 GMC 1942 CCKW 121922-2 Diamond T 968A 1082 Diamond T 968A 2834
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#3
06-11-09, 02:03
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Only old-truck guys could say this...
.... Just wind mixture screws in till it goes off song, then out till same & set screws in middle of that......
"Till it goes off song" (amazingly accurate use of the language)
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Charles Fitton Maryhill On., Canada too many carriers too many rovers not enough time. (and now a BSA...) (and now a Triumph TRW...)
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#4
06-11-09, 04:15
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Quote:
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Model U.C. NO-2 MK II.* SERIAL 25680 HULL 24699. LOWER HULL 24742. ENGINE TL-26707-F. C.D. 2609. BUILT MAR. 25, 1944. CT 266677 Former WASP
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#5
06-11-09, 04:18
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Quote:
If your engine is running smoothly without blowing smoke, you can try to reduce it a little by turning the idle screw to the leanest point, or even replacing the jets with a smaller size, but you might have to just face the fact that these engines pollute a bit.
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#6
06-11-09, 05:47
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Emissions aint they great!
Due to the fact our respective governments are dreaming up new ways of taxing us, including hitting us for carbon emissions, you want to be doing your fair share of emitting to get your money's worth.
Turn the thing till it gets rich!! Aim for CO of 40-50%. Heck we only use 20% of the oxygen in a breath!
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Pax Vobiscum.......may you eat three meals a day & have regular bowel movements.
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#7
06-11-09, 06:54
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Swiss Chris aka Christoph Zimmerli - Driving Switzerland's only Aussie F15 www.wheelsandtracks.com >> Condor A580 M+85691 (1952), Swiss Army Motorbike (unrestored) >> F15 1942 Aust (Cab 13) ::: restored by Keefy
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#8
06-11-09, 09:44
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Quote:
 Threads now merged. H.
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Regards, Hanno --------------------------
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#9
06-11-09, 16:17
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There have been some emissions testing on Antique Cars
Hi All
I do remember that there has been some recent emissions testing done on antique cars in the US with in the last few years which included a Ford Model A and I think some Ford V8s. I'll do some searching and see if I can find the test results. As to fuel air testing I know that there was equipment back in the early 50s because my father had a test unit which he used to tune up high performance big block Lincoln flat head V8s. Family had a 49 Lincoln running a 337 bored to 350 flat head. Engine was rated at 150 HP by the time he finished playing it was producing 150 HP+ delivered to the ground at the rear wheels. So all the testing was for power not necessarily clean air. Cheers Phil
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Phil Waterman `41 C60L Pattern 12 `42 C60S Radio Pattern 13 `45 HUP http://canadianmilitarypattern.com/ New e-mail Philip@canadianmilitarypattern.com
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#10
07-11-09, 00:46
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Quote:
Paul
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#11
08-11-09, 04:57
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We have emission testing in this province, even for vintage vehicles. When I took my Dodge M152 (flathead Chrysler 6 cylinder) through the first time it failed. I didn't really expect it to pass but I wanted a baseline. After a valve cleaning and new head gasket it passed with about 30% of the maximum allowable emissions.
The idle test results were 314 out of 972 ppm for hydrocarbons and 2.26% for CO with a maximum allowed of 4.90%. NOx was never measured.
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#12
08-11-09, 10:45
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thanks guys.
Hi, Thanks Guys for the replies, here In the UK, I understand there is an upper limit of 4.5% CO for this vintage of vehicle, however as a track laying vehicle and because of its age there is no requirement to pass an MOT. I will tweek those mixture screws in a little and aim for about 4.0% CO in air keeping it 'on song'.
Many thanks Kevin.
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2pdr Tank Hunter Universal Carrier 1942 registered 11/11/2008. 3" Mortar Universal Carrier 1943 registered 06/06/2009. 1941 Standard Mk1 stowage Carrier, Caunter camo. 1941 Standard Mk1 stowage Carrier, light stone. 10 cwt wartime mortar trailer. 1943 Mk2 Daimler Dingo. 1943 Willys MB. 1936 Vickers MG carrier No1 Mk1 CMM 985.
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