installing headers!

hello just a couple questions about installing a secondhand headers on a civic ek1 sedan with a d16y4 engine

the headers look similar to this..

would i need a head gasket and is it easy to install? just bolt on and go?

sorry for the noob question

Yup,just bolt on and go.You will need an exhaust gasket.

Personnally I would have another bung made for the 02 sensor where the 2 pipes go into 1.That way the 02 sensor reading is of the 4 cylinders,not just 2 (where it is now).That way you have a true-er reading.

so that sensor thing that hanging out of the header will only read 2 cyclinders not 4??
cant i just use my old exhaust gasket lol!

yep, as Beeza stated, straight bolt on and make another plug for the O2 sensor just before the connection to the cat.

I might re-use the exhaust manifold gasket. OEM gasket is good enough.

thanks for the help guys, shall get into it soon!

yea i think the old owner stuck the sensor to read less oxygen (1/2) of what is actually released from the engine output so the ecu thinks the engine is running lean so it adds more fuel = more power? (correct me if i'm wrong, it could be the other way round = fuel economy wise?)

Yes,and I forgot a gasket at the other end too.Some gasket sealant is good to use too!

Quote:

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Originally Posted by redmugenjazz

yea i think the old owner stuck the sensor to read less oxygen (1/2) of what is actually released from the engine output so the ecu thinks the engine is running lean so it adds more fuel = more power? (correct me if i'm wrong, it could be the other way round = fuel economy wise?)

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redmugenjazz!

It's how they come,stoopid!

Those headers look really good!

Quote:

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Originally Posted by beeza

Personnally I would have another bung made for the 02 sensor where the 2 pipes go into 1.That way the 02 sensor reading is of the 4 cylinders,not just 2 (where it is now).That way you have a true-er reading.

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It wont make any difference whether it's reading 2 cylinders or 4 cylinders..... it's only a narrowband oxygen sensor

Quote:

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Originally Posted by redmugenjazz

yea i think the old owner stuck the sensor to read less oxygen (1/2) of what is actually released from the engine output so the ecu thinks the engine is running lean so it adds more fuel = more power? (correct me if i'm wrong, it could be the other way round = fuel economy wise?)

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FYI you make more power from running leaner and it doesnt read any different being where it is atm

Quote:

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Originally Posted by ZeForce

It wont make any difference whether it's reading 2 cylinders or 4 cylinders..... it's only a narrowband oxygen sensor

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Thanks ZeForce but I'm confused cause this is what I've learnt...

Quote:

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Originally Posted by beeza

Thanks ZeForce but I'm confused cause this is what I've learnt...

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Theoretically reading from all 4 cylinders is better, in practice it wont make any difference