Manifold wall thickness vs EGT NPT size

Manifold wall thickness vs EGT NPT size

06-24-2004, 04:22 PM

#1 (permalink)

PaulG1

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Join Date: Apr 2004 Location: Sacramento, Ca Posts: 48

Manifold wall thickness vs EGT NPT size

Need some help.

I ordered a Pricol EGT gauge which came with a 1/4" NPT probe thread instead of the 1/8" it was supposed to have.

So a few questions before I return it.

1. Is there any advantage of the 1/4" NPT over the 1/8" NPT?

2. What is the wall thickness of the exhaust manifold in a 95 12V where the NPT will screw into (1/8 NPT has 27 threads per inch vs 18 TPI for the 1/4" - seems more threads in a thin wall is better).

3. Drilling a smaller hole is much easier and weekens the manifold less - does this make sense?

Thanks again for the help - hate it when the wrong hardware arrives.

Thanks,

Paul

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95 3500 QC, 2WD, 5spd, stock + unidentified higher flow injectors (mild), BD brake, 58K miles, towing 6500lb 25ft 5er

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