View Full Version : Thread on New Age uppipe sensor boss?

4th February 2003, 13:54
Can't remember if it's for EGT or O2 but I know there's a threaded boss on there.

I haven't got the uppipe yet but I need the thread spec to order a compression fitting for the thermocouple I'm going to use for measuring EGT.


4th February 2003, 16:51
I can't help you on this Andrew but if you didn't know it there are up pipes with two bosses for EGT and O2 sensors available on the market.

4th February 2003, 18:21
Thanks JIM,

I happened on a little used H&S uppipe for a good price so bought it, I think these only have 1 boss which is all I need.

It may be a little while before I get the uppipe and I'd like to have the EGT sensor fitting waiting for it.


4th February 2003, 20:52
I think, but can't be sure, that it's for an O2 sensor, and it's an M11 thread...it's quite large, certainly much larger than the typical 1/8th bsp that EGT bosses use!

14th February 2003, 10:18
Looks like its 1/2" or 7/16" BSP, its 20tpi according to my thread gauge, I'll go down to my local hydraulics specialist (my Dad) and see if they have anything to fit.


14th February 2003, 11:56
I think it's an M12 thread of some sort, perhaps M12 fine. THe standard exhaust studs are 5/16" UNF I think. so you could try one of those.


14th February 2003, 16:11
Thanks Paul,

Haven't had chance to try anything yet, forgot pop's away this w/e and I'll never find anything if he's not there!


24th February 2006, 17:09
bringing this to the top as i've got a helix (i think) uppipe with an EGT hole, which i cant work the thread out on..

again it looks like 7/16th 20tpi but its really loose until you tighten it fully down.

did you work out what it was ?

and what to use as
a) an adaptor to 1/8npt
b) egt k-type boss?

as i need to move the egt to pre-turbo really..


24th February 2006, 18:05
weld it up and then drill and tap it for 1/8npt

24th February 2006, 18:37

24th February 2006, 18:58

It's metric fine fella

dia I'm not so sure on so will keep quiet on that.

Mind you, welding the right boss on sounds a hellava lot easier... if you can weld of course. :D


24th February 2006, 19:12
thats the problem Andy (&Steven) coz it is SS i dont want to just take it to somewhere that has a mig etc.. dont sure on SS welders around here.

also, it has a nice big tapped hole, so why not use it.

metric - really? we couldnt find a thing to fit it that was, 7/16 was nearest.

fine - yep agree on that one smile.gif

need someone with EVERY conveivable tap ! tongue.gif

24th February 2006, 19:17
FWIW.. Steven, its quite hard to drill and tap a weld

Steve, who gives a fook if its migged.. its only a little bit of rust that may weld!!

Or you could just get a small roll of ss welding wire.


24th February 2006, 19:27
I was suggesting that way, because that is exactly what i did with my Gruppe S flexi up pipe over 2 years ago, which did a good few thousand miles with no problems.

I just migged up the hole, starting as far down as i could, then just re drilled incrementing the bit size gradually, and then tapped it with 1/8npt for the defis egt.

i then filed the rough bits off the inside of the pipe.

Took me an hour if that.

If i can weld it up satisfactorily, then anyone can.


24th February 2006, 19:40

time to find a welder then !

unless Andrew found a boss ?

24th February 2006, 19:54
Magnex up pipes come with a bag of bolts for "hole filling" but alas a loose one one day didn't so had to go across the road to the bolt supplier. 90% sure it was metric fine.
Although as Tim said in another post, I could have Pox on the brain as well. :D


Andrew Carr
24th February 2006, 20:11
The thread is 12x1.25mm.

I can send you a bolt if you like, is it Ok to put it in with Iain's WB sensor?


24th February 2006, 20:13
Steven, I know but sometime it can be a right pain in the arse.. not for the feint hearted that just try and force their way in with the correct sized drill bit, hmm that sounds like you tongue.gif

Also carbon steel taps dont really cut it (pardon the pun!)

24th February 2006, 20:22
Andrew .. is it ? redface.gif

bolt would be good (and yeah,ok) but i then need a boss or something! what did you do?

24th February 2006, 20:28

24th February 2006, 20:53
Indeed it be

I don't know what thread the MIG welder is, but it seems to fit every time ;)


24th February 2006, 21:01
lol @ Zen off on one already ;)

24th February 2006, 21:59
EGT is usually 1/8" BSP isn't it? Lambda is M18.

Farnell sell 1/8 BSP thermocouple mounting thingys too smile.gif (I'm using these on the new TVR exhaust)

24th February 2006, 23:50
yes Dave , and thats why i was like :confused: when i looked at the hole .. stick the 1/8th tap in and it almost falls through it ! redface.gif

need to get a new fitting too.... might have a look see waht they are like...

Andrew Carr
25th February 2006, 10:28
Originally posted by dnb:
EGT is usually 1/8" BSP isn't it? Lambda is M18.

Farnell sell 1/8 BSP thermocouple mounting thingys too smile.gif (I'm using these on the new TVR exhaust) Dave you are correct, I was just saying that the boss on the new age uppipe (and all the aftermarket ones I have seen) is M12x1.25.

I have some bolts of that size that can be used to either just bung the hole or be drilled and tapped to make an adaptor.


25th February 2006, 10:45
while you're all on EGT sensors, can you recommend a nice short K type, the ones we have at work are too long for where I want to stick em. :eek: :D


Andrew Carr
25th February 2006, 11:21
I had mine custom made by Thermodata (01462 811757), still a lot cheaper than RS/Farnell/TCDirect.

If you know roughly what you want I can give you a part code to tell them.

From memory a 100mm long 310s/s sheathed K-type, 2M glass braided lead with miniature TC plug AND 1/8bsp brass compression fitting was about 14.

They're not off the shelf though, expect to wait about 2 weeks for 1.


25th February 2006, 11:40
Arse...that sounds a far better idea than the TCDirect route I've gone down :(

25th February 2006, 12:13
Cheers for that Andrew, have found the website and I'll get the catalogue.


25th February 2006, 12:23
Fcuk me that's a part Number and a half, here you go..
TCM1FLKJ1D205L0075SM310PP2LL2000L1L6TT1FF2 :eek:


Andrew Carr
25th February 2006, 12:32
They don't seem to do email too well, better to ring them.

Here's a good one: TC MI FLK JG D30 SL0075 SM310 PP1 LL3000 LIL4 TT3 FF2


25th February 2006, 13:17
:D Cheers