Going w/TBI: where to put O2 sensor bungs? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mt Al · 03-07-2005, 09:26 PM

My exhaust looks like rusted lace...mighty full of holes and in need of replacement.

Since I need O2 sensors for a TBI system (www.affordable-efi.com) does anyone know where to put them? I'm thinking right in the collector. Do they point up, down, sideways, does it matter?

Thanks for the help!

*dtlilly* · 03-07-2005, 09:48 PM

Those sensors should be put within several inches of the collector. Some have drilled and tapped the manifold, but failure with cracks and leaks are common. They should be pointed in such a way that you will be able to get a wrench on them to get them out fairly easy. Sounds like a cool project, I almost went with a 350 TPI set-up on ol'Reb (71 GMC 4X4), but decided to sell everything instead.

**VetteVet** · 03-07-2005, 11:06 PM

Here's one on a cobra pipe I found on googlehttp://www.quickkeys.com/Cobra/photo-drivetrain.htm

VetteVet

4x4Poet · 03-08-2005, 01:33 AM

I read somewhere that O2 sensors must be mounted with the sensor end pointing down or above sideways to keep from ruining the sensor early. I think because, if the sensor is mounted pointing up, more exhaust crud will settle on the tip due to gravity. Haven't had a chance to verify this. Maybe muffler shops know this. Or EFI sources, like the one you linked.

*dtlilly* · 03-08-2005, 01:38 AM

Quote:

Originally Posted by 4x4Poet

I read somewhere that O2 sensors must be mounted with the sensor end pointing down or above sideways to keep from ruining the sensor early. I think because, if the sensor is mounted pointing up, more exhaust crud will settle on the tip due to gravity....

That makes sence to me.

03-07-2005, 09:26 PM	#1
mt Al Registered User Join Date: Aug 2001 Location: Bozeman, Montana Posts: 243	Going w/TBI: where to put O2 sensor bungs? My exhaust looks like rusted lace...mighty full of holes and in need of replacement. Since I need O2 sensors for a TBI system (www.affordable-efi.com) does anyone know where to put them? I'm thinking right in the collector. Do they point up, down, sideways, does it matter? Thanks for the help! __________________ '72 GMC 1/2T 4x4 1500 Super Custom pickup (current) past rides were: '70 Chev 2wd farm truck '71 GMC 2wd 1/2T 402 nice! '72 Chev 2wd 1/2T 396 '72 GMC 3/4T 4x4 2500 Super Custom suburban. Bozeman, Montana

03-07-2005, 11:06 PM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,723	02 sensor location Here's one on a cobra pipe I found on googlehttp://www.quickkeys.com/Cobra/photo-drivetrain.htm VetteVet __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

03-08-2005, 01:33 AM	#4
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	I read somewhere that O2 sensors must be mounted with the sensor end pointing down or above sideways to keep from ruining the sensor early. I think because, if the sensor is mounted pointing up, more exhaust crud will settle on the tip due to gravity. Haven't had a chance to verify this. Maybe muffler shops know this. Or EFI sources, like the one you linked. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

03-07-2005, 09:48 PM	#2
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	Those sensors should be put within several inches of the collector. Some have drilled and tapped the manifold, but failure with cracks and leaks are common. They should be pointed in such a way that you will be able to get a wrench on them to get them out fairly easy. Sounds like a cool project, I almost went with a 350 TPI set-up on ol'Reb (71 GMC 4X4), but decided to sell everything instead.



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