2 exhaust issues

tweiss3 · 10-18-2010, 07:45 AM

First, where do you guys get you o2 sensore. i was just quoted 210 from mazda and there are only 6 left in the usa? Will the bosch from autozone work well? Will it hold up to the egt?

Second, is there some kind of trick to keeping the flanges tight. I now from the header flang to the tailpipe have fresh grade 8 hardware, new stainless exhaust piexes and coper gaskets. I am forced to tighten everything every 2 days cause it keeps loosenong and its getting annoying.

Please excuse my typos, my android phone isnt as rasy to type on as my old tp2.

Boosted FC · 10-18-2010, 09:00 AM

The Bosch will work just fine. Try using some lock nuts & see if that helps on the exhaust.

NoDOHC · 10-21-2010, 09:43 PM

The stock ECU runs pretty fat, I doubt that the EGT will hurt any sensor. I think all narrow band O2 sensors are the same anyway (with the exception of heating techniques).

The 'secret' to the exhaust flange tightening is to beat the car around for a while, pull it into the garage and immediately tighten the extremely hot bolts to a very snug level.

You should check your engine mounts, a bad engine mount will cause exhaust pipe loosening.

I doubt that your stock engine torques hard enough into good mounts to do much flexing of the exhaust.

tweiss3 · 10-21-2010, 10:16 PM

I think my trans mounts and engine mounts are pretty warn. What I have been doing is every few nights, really run the car the last 2 minutes of my commute and then toss it on the ramps and tighten the hell out of the extremely hot hardware. I do think you may be on to something with the motor/trans mounts, mine seem loose. I guess thats the next upgrade.

project86 · 10-22-2010, 08:02 PM

Go polly!!!

rxspeed7 · 11-03-2010, 10:02 PM

Copper rtv on the nuts and bolts along with locking washers. That should pretty much eliminate any type of loosening your experienceing.

Zack.

RETed · 11-03-2010, 10:30 PM

Quote:

Originally Posted by rxspeed7

Copper rtv on the nuts and bolts along with locking washers. That should pretty much eliminate any type of loosening your experienceing.

That's a real stupid thing to do.
Copper RTV is only good for like 700F intermittent - see package.
It turns to dust on a rotary exhaust, unless you're talking about fasteners back in the rear muffler.

Also, no locking washer on the market can handle high heat.
Locking exhaust nuts are the only solution.

-Ted

RotorDad · 11-04-2010, 01:14 AM

Nothing wrong with the Bosch O2 sensors.

rxspeed7 · 11-04-2010, 07:23 AM

That's what I thought he meant. I know on the header it'd be useless but on anybof the flanges after the header I don't quite think they get that hot. Shoot I know of someone that's been building aviation and road race rotaries since before I was born that uses mearly tub and tile silicone for header gaskets and doesn't have a single issue with it. The heat may be there but on a n/a it's such a low pressure area that a leak isn't that likely. Iirc and exhaust leak will actually pull in outside area through the scavenging effect.

Rotary Related · 11-15-2010, 02:20 PM

The bosch sensors work fine. I know that was already stated but just incase you still doubted it there you go.

You can get them with the stock connector on them at Autozone for just a few more dollars then one without one. Buy the one with the connector. I am currently trying to get ahold of the factory sensor connectors at this time and they will be available seperately as soon as I get them. All will be converted to S5 spec connectors as they are really just a better piece anyways.

10-18-2010, 07:45 AM	#1
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio Posts: 319 Rep Power: 16	2 exhaust issues First, where do you guys get you o2 sensore. i was just quoted 210 from mazda and there are only 6 left in the usa? Will the bosch from autozone work well? Will it hold up to the egt? Second, is there some kind of trick to keeping the flanges tight. I now from the header flang to the tailpipe have fresh grade 8 hardware, new stainless exhaust piexes and coper gaskets. I am forced to tighten everything every 2 days cause it keeps loosenong and its getting annoying. Please excuse my typos, my android phone isnt as rasy to type on as my old tp2. __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles

10-18-2010, 09:00 AM	#2
Boosted FC Rotary & Boost Addict Join Date: Feb 2008 Location: Dallas, Ga Posts: 203 Rep Power: 18	The Bosch will work just fine. Try using some lock nuts & see if that helps on the exhaust. __________________ '05 Copper 6s, '87 TII RX7...248whp & 224wtq @ 12lbs

10-21-2010, 09:43 PM	#3
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	The stock ECU runs pretty fat, I doubt that the EGT will hurt any sensor. I think all narrow band O2 sensors are the same anyway (with the exception of heating techniques). The 'secret' to the exhaust flange tightening is to beat the car around for a while, pull it into the garage and immediately tighten the extremely hot bolts to a very snug level. You should check your engine mounts, a bad engine mount will cause exhaust pipe loosening. I doubt that your stock engine torques hard enough into good mounts to do much flexing of the exhaust. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

10-21-2010, 10:16 PM	#4
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio Posts: 319 Rep Power: 16	I think my trans mounts and engine mounts are pretty warn. What I have been doing is every few nights, really run the car the last 2 minutes of my commute and then toss it on the ramps and tighten the hell out of the extremely hot hardware. I do think you may be on to something with the motor/trans mounts, mine seem loose. I guess thats the next upgrade. __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles

10-22-2010, 08:02 PM	#5
project86 Can't.Make.Up.My.Mind. Join Date: May 2009 Location: Murfreesboro, TN Posts: 1,377 Rep Power: 18	Go polly!!! __________________ '90 GTUs Stay up to date with my photography '06 Toyota Highlander Hybrid '10 Toyota Prius "Initial Success or Total Failure"

11-04-2010, 01:14 AM	#8
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va Posts: 591 Rep Power: 17	Nothing wrong with the Bosch O2 sensors. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.

11-15-2010, 02:20 PM	#10
Rotary Related Good stuff at low prices Join Date: Oct 2010 Location: TX Posts: 52 Rep Power: 16	The bosch sensors work fine. I know that was already stated but just incase you still doubted it there you go. You can get them with the stock connector on them at Autozone for just a few more dollars then one without one. Buy the one with the connector. I am currently trying to get ahold of the factory sensor connectors at this time and they will be available seperately as soon as I get them. All will be converted to S5 spec connectors as they are really just a better piece anyways. __________________ Visit us at: www.rotaryrelated.com or find us on facebook