Pyrometer Thermocouple size

[WOT]

I am about to order a EGT guage and have a question about what size thermocouple to get. I have been told that a 1/4" probe will last longer than an 1/8" probe. What concerncs me is how much restriction I am putting in the exhause manifold (am mounting pre-turbo). Will a 1/4" probe cause too much restriction? Anybody have any longevity infomation about either?

Thanks

Bob

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2000 QuadCab, 4x4, 2500, 6spd, Intense Blue Pearl, No mods as of yet!

 

[illflem]

I have never heard of longevity nor restriction being an issue with either size. The 1/8" probes respond faster than 1/4", but the 1/4" responds plenty fast for our application. I think it just boils down to personal preference and what is available with the type of gauge you buy.

 

[Alan Reagan]

There is not that much difference in the probe sizes. I prefer the 1/8 cause it's a smaller hole in the manifold (if you are going pre turbo.

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2001 HO 6 spd 2500, 4. 10 LSD, Towing Package, Electric Brakes, SPA EGT/Boost Gauges, Fog Lights, Real Backup Lights, Molded Running Boards

 

[Archive]

I have run both no problem either way #ad
.

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2001 RAM H. O. 6Sp 2500 SLT 4x4 Quad Cab, 4Wheel Disc, 4. 10 Limited Slip, Fog Lights, Muffler removed, Silence Ring Gone, K&N RE-0880, Skyjacker 2. 5 lift Class 2, Custom Pro Fab Trackbar(sweet), EGR Flares. THIS IS NOT A HOBBY,THIS IS AN ADDICTION !!! MAINLINING DIESEL !!!