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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,072
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oxygen sensor placement ,1994 Harley
Question for the ever giving and knowing brain trust here-
Where is the best place for this oxygen (AFR) sensor ? I have part A ok , - front cylinder. Next- They say maybe 15 inches away from header flange . Or perhaps 6 " depending on engine temps.... What works best ? Reading the instructions is for the generic engine. They want a few deg of tilt so nose dwn and tail up. Got that. But the wording of how far away for this engine, that engine, and of course no mention of a old V twin .LOL To me me it looks like about 8" dwn from the header flange at the 1st bend would be it. Will that be too hot? I thought i would ask B4 punching holes and welding in bungs. Thanx!
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-18-2015, 01:45 PM
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Air Medal or two
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Also
should the bung be angled ?
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-19-2015, 12:48 AM
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Registered
Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
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Due to air flow, rear cylinder runs warmer. Would it make sense to get UR data from that pipe?
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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06-19-2015, 05:52 AM
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Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
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Quote:
Leave one bung plugged and move the sensor back and forth after tuning to see if any significant difference shows up in cyl 1 vs cyl 2
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1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 |
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06-19-2015, 06:39 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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I assume that you have only 1 sensor. What style exhaust are you running? Duel independent pipes or 2-into-1 setup?
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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06-19-2015, 06:43 AM
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Air Medal or two
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Asphaultgambler - 2 into one (thunder headers )
Johnsjmc - I like that idea of a bung in each pipe, and swapping back and fourth. LakeCleElum - From what i have read the front is more important then the rear as it always runs leaner. If that is satisfied , the rear is what it is unless i convert to some kind of fuel injection .(not going to) The more I think about it all - Once dialed in perhaps just remove the sensor and gauge. Keep it for a tool. This is a wide band sensor and will supposedly last awhile even with leaded fuel. The directions are all over the place as for placement location. Next Should it have a angel built into the bung so the nose sort of faces the tail pipe ?
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-19-2015, 10:26 AM
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Registered
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Location: London Ont Canada
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If using a 2 into 1 the placement for a single would be just after the collector. However tuning will only produce an average mixture between the 2 cyls. I would still do 2 bungs and use the sensor for tuning then after satisfied with the results you can remove it and put it in your toolbox as a tuning tool.
I don,t know if there is any way to compensate for a lean vs rich cyl when only using a single barrel carb. so tuning will be still a compromise.
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1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 |
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06-20-2015, 09:27 AM
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Air Medal or two
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well...I am still in a quandary of the placement or distance from header flange...Thats my biggest question with it all..
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-20-2015, 03:58 PM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
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I would put the 1 sensor just after the 2-1 merge into the collector. Although, as I stated before, unless you have fuel injection - not a fan of these as long -term use. You would be surprised how that chunk of metal hanging inside the exhaust tube has a negative effect on flow. You should weld the bung just on top on the tube, not through to the inside lower to be out of sight. Then once you have the mixture set - remove it and plug it.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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06-22-2015, 07:33 AM
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Air Medal or two
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OK
On my way to do something here.... Thnx
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-22-2015, 09:12 AM
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