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Author Topic: A few exhaust questions
Teamfour Verified Driver Made Donation to Website
Member

Region: WDCR
Car #: 04
Year : 1993
Posts: 519
Status: Offline
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Yesterday I dropped a wheel off a curb and hit the curb with the exhaust. Now the area where the forward part of the exhaust slip fits on the short pipe off the manifold is slightly loose. I noticed there is a clamp there that looks like it should have a bolt through it. No bolt though. I looked at another 1.6 and there was no bolt on that one either. Are we both missing a bolt?

What exactly is considered to be the "down pipe"? Is this the pipe that the O2 sensor is mounted in?

I have a LC1 wideband sensor to install. What is the best area to weld the bung?

TIA

--------------------
Lee Tilton
1993 Meowta #04
Brimtek Motorsports/ Team Four Racing
Team Four Racing

Tyler Dahl Verified Driver Series Champ
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Region: Utah
Car #: 70
Year : 1991
Posts: 169
Status: Offline
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There is a 4" 12mm headed bolt that goes through the clamp and holds the downpipe to a bracket on the bell housing.

The downpipe is the piece that attaches to the exhaust manifold and the cat.

I mounted my wideband sensor in to the collector of the exhaust manifold.

--------------------
Tyler Dahl
Race Engineering
Miatacage.com
Carbotech

George Munson Verified Driver
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Region: 83
Car #: 127
Year : 90
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Answer to the first question is "Yes" you are both missing bolts that hold the clamp

Next on my 1.6 I mounted my wide band sensor in the O2 sensor hole and then clamped the stock O2 sensor to the down pipe.

Teamfour Verified Driver Made Donation to Website
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Region: WDCR
Car #: 04
Year : 1993
Posts: 519
Status: Offline
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Thanks guys!

--------------------
Lee Tilton
1993 Meowta #04
Brimtek Motorsports/ Team Four Racing
Team Four Racing

Eric Barbaric Verified Driver
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Region: Kansas City
Car #: 95
Year : 1991
Posts: 311
Status: Offline
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I've read that the bolt is important to have in there, as it provides some needed support.

Without it, "they" say that the balance of the exhaust system will flex, causing cracks in the exhaust manifold.

I'm not sure if cracks in the manifold would be a performance advantage or disadvantage.

Tyler Dahl Verified Driver Series Champ
Member

Region: Utah
Car #: 70
Year : 1991
Posts: 169
Status: Offline
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A cracked Exhaust manifold is a disadvantage

--------------------
Tyler Dahl
Race Engineering
Miatacage.com
Carbotech

   

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