02s in header

vic guilmino · 12-27-2019, 10:27 PM

How far from the end of header should the 02 be placed

gmonde · 12-28-2019, 12:07 AM

most are as far back in the collector as you can get,, but a true reading should be in the primary tube of the leanest cylinder for your combo
collector readings will be leaner than in a primary tube ,,so when doing a dyno session apples for apples
if your on the dyno use the same sensor location

Sean Cour · 12-28-2019, 01:30 AM

Quote:

Originally Posted by vic guilmino

How far from the end of header should the 02 be placed

Two inches beyond the merge. If in SS, you want them pre the pan evac.

HR9121 · 12-29-2019, 09:39 PM

To add to what Sean said, 2" beyond the merge and it helps if you have somewhere in the neighborhood of 14 to 18" of collector beyond that.

Signman · 12-30-2019, 11:09 AM

Within 20 inches of the exhaust valve will be more accurate see less fresh air.

Shadylane · 12-30-2019, 12:05 PM

Tagging onto this thread. I put a different set of headers on my car that use slip tubes. I noticed the tube my sensor is in is leaking slightly. What can I use to seal it?
Kelly

Jim Kaekel · 12-30-2019, 05:26 PM

Permatex offers a high heat/sensor safe sealant.

vic guilmino · 12-30-2019, 08:03 PM

My are 9 from the end of collector

Duane Eiskant II · 12-30-2019, 10:23 PM

Mine are about 4” from the end. Never dynoed it, found the happy spot (fasted tune up down the track) and monitor it now for changes.

12-27-2019, 10:27 PM	#1
vic guilmino Senior Member Join Date: Dec 2001 Location: wv Posts: 882 Likes: 42 Liked 56 Times in 21 Posts	02s in header How far from the end of header should the 02 be placed __________________ Vic Guilmino 1129 STK

12-28-2019, 12:07 AM	#2
gmonde Senior Member Join Date: Nov 2007 Posts: 615 Likes: 56 Liked 166 Times in 59 Posts	Re: 02s in header most are as far back in the collector as you can get,, but a true reading should be in the primary tube of the leanest cylinder for your combo collector readings will be leaner than in a primary tube ,,so when doing a dyno session apples for apples if your on the dyno use the same sensor location

12-29-2019, 09:39 PM	#4
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,353 Likes: 112 Liked 2,869 Times in 641 Posts	Re: 02s in header To add to what Sean said, 2" beyond the merge and it helps if you have somewhere in the neighborhood of 14 to 18" of collector beyond that. __________________ James Williamson W200 J/SA

12-30-2019, 11:09 AM	#5
Signman Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 493 Likes: 14 Liked 199 Times in 74 Posts	Re: 02s in header Within 20 inches of the exhaust valve will be more accurate see less fresh air. __________________ Frank Ferrucci ?/SA 1271

12-30-2019, 12:05 PM	#6
Shadylane Member Join Date: Apr 2009 Location: Farmington, New Mexico Posts: 189 Likes: 169 Liked 119 Times in 39 Posts	Re: 02s in header Tagging onto this thread. I put a different set of headers on my car that use slip tubes. I noticed the tube my sensor is in is leaking slightly. What can I use to seal it? Kelly

12-30-2019, 05:26 PM	#7
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,222 Likes: 134 Liked 498 Times in 104 Posts	Re: 02s in header Permatex offers a high heat/sensor safe sealant. __________________ Jim Kaekel 3836 STK

12-30-2019, 08:03 PM	#8
vic guilmino Senior Member Join Date: Dec 2001 Location: wv Posts: 882 Likes: 42 Liked 56 Times in 21 Posts	Re: 02s in header My are 9 from the end of collector __________________ Vic Guilmino 1129 STK

12-30-2019, 10:23 PM	#9
Duane Eiskant II Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 496 Likes: 256 Liked 53 Times in 31 Posts	Re: 02s in header Mine are about 4” from the end. Never dynoed it, found the happy spot (fasted tune up down the track) and monitor it now for changes. __________________ Duane Eiskant 1354 Stock/Super Stock