Exhaust probe.

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Mar 22, 2008 | 10:46 PM

officer131

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Joined: Dec 2007

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From: Metro Detroit, MI.

Exhaust probe.

Just installed the pillar gauges in the X. Reading the directions and suggestions on the board here. Were would I find the "R" on the drill bit for the probe hole. What size would that be ex: 1/4 or what?

Mar 22, 2008 | 10:56 PM

Izzy351

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Joined: Feb 2007

Posts: 14,541

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From: Dallas-Ft. Worth

It would be where it normally is. Here are the details on an R bit:
8.6106mm -- .339" -- R -- 1/8"-27 NPT

Check out the size chart here (R is quite ways down the list):
http://bobmay.astronomy.net/misc/drillchart.htm

Here's another good page:
http://www.sheldonbrown.com/tooltips/taps.html

Mar 22, 2008 | 10:59 PM

IDPisan

Elder User

Joined: Sep 2006

Posts: 627

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From: Middleton, Idaho

If you are going to tap it the size is a 21/64 drill bit. Start smaller and work your way up use a shop vac to suck out the shavings.
Hope this helps!

Mar 23, 2008 | 01:02 AM

hosemandc

Senior User

Joined: Jun 2006

Posts: 423

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From: Kodiak AK

I used a 21/64 and it works great. Drop the front driveline and save yourself some trouble. You can get it done with out dropping it but what a hasle. Be careful not to tap too far.