EGT probe size (already searched)
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EGT probe size (already searched)
My question is this. It says in the Defi manual that the fitting is 1/8PT. I know PT stands for pipe thread but what is the 1/8 stand for? I assume it's not diameter in inches becase the drill bit needed to drill the hole is 21/64" which is much bigger than 1/8". Can someone please explain this to me?
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1/8 Pipe Thread is right. Thats what is for Greddy (and I assume most other) EGT gagues.
If you look in any tap and die set (metric or standard) there is almost always a tap labled 1/8 pipe on it.
One thing I should mention with a pipe thread tap is the farther you thread it is, the larger the hole becomes, so, keep test fitting your probe so that you don't go too far.
If you look in any tap and die set (metric or standard) there is almost always a tap labled 1/8 pipe on it.
One thing I should mention with a pipe thread tap is the farther you thread it is, the larger the hole becomes, so, keep test fitting your probe so that you don't go too far.
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Originally Posted by ItsFast
1/8 Pipe Thread is right. Thats what is for Greddy (and I assume most other) EGT gagues.
If you look in any tap and die set (metric or standard) there is almost always a tap labled 1/8 pipe on it.
One thing I should mention with a pipe thread tap is the farther you thread it is, the larger the hole becomes, so, keep test fitting your probe so that you don't go too far.
If you look in any tap and die set (metric or standard) there is almost always a tap labled 1/8 pipe on it.
One thing I should mention with a pipe thread tap is the farther you thread it is, the larger the hole becomes, so, keep test fitting your probe so that you don't go too far.
#7
Wow, so many 'mechanically inclined' people here and no one knows what pipe tap is? Designated PT sizes are the amount of diameter change per inch of thread. 1/8" pipe tap means that there's a diameter change of 1/8" per inch of thread. Larger hole size allows a good solid start, and then the narrowing makes it at the least water tight.
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#9
Originally Posted by M00kiE
1/8 is the thread size then and is unit-less... (e.g. 10-32, 1/4-20, etc.) It's not the diameter of the hole.
I suppose I should add that it is indeed the size you want to use, not whatever anyone would recommend or the metric equivalent or anything like that, if the installation guide says 1/8" PT then that's what you use. The post about checking it was right, check every half turn of the tap once threads are established all the way through whatever you're tapping. If you're cutting into something ~1/8" thick you'll probably be properly cut as soon as you're past the entry on the tap. (section with smaller diameter and no real cutting edges.) Use tap oil. It'll keep you from cross threading and really screwing things up. After each half turn back it out and run it in and out a few times before checking, this will remove any burrs and keep you frrom over cutting the hole.
Last edited by Spartacus51; Nov 18, 2005 at 11:38 AM.
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