Drill and tapping...

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guesswho
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Posts: 212
Joined: Sat Dec 13, 2008 8:42 pm
Location: philadelphia

Drill and tapping...

Post by guesswho »

Hey guys, I have a Prodrive downpipe I am going to drill and tap for an 02bung. Does anyone know what size drill bit and tap I need to do this?

Is there a specific depth I have the set the bung at? Thanks in advance!
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PhyrraM
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Joined: Thu Aug 11, 2005 4:34 pm
Location: Lake Elsinore, CA

Post by PhyrraM »

Generally speaking you usually buy a bung and have it welded on. The wall of the exhaust tubing is most likely too thin to reliabley tap, and the O2 sensor needs a flat surface to seal against, much like a spark plug.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
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guesswho
First Gear
Posts: 212
Joined: Sat Dec 13, 2008 8:42 pm
Location: philadelphia

Post by guesswho »

The downpipe has a bung already welded into it, but the diameter is too small. I just the need to know the size drill bit and tap I need.
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Buffman
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Joined: Sat Sep 13, 2008 1:59 am
Location: MI

Post by Buffman »

M18 x 1.5 mm.. What kind of 02 are you trying to use. Most are all the same size, unless the DP is smaller than it should be.
1992 Legacy LS Special Wagon..
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