1934 Chevrolet Tudor

[Gampy]

Curious how long the probe is on that sensor ... Is it still in the stream (and by how much) or does it end in the adapter?

[34EV1L]

Curious how long the probe is on that sensor ... Is it still in the stream (and by how much) or does it end in the adapter?

Should have taken a photo before I put it in. The tip of the probe does go further than the adapter by at least 5mm.

Hope that helps.

[vlad01]

When I had my adapter made it was 12 X 1.5 straight thread with a flat face for the copper washer. And the outside was what ever imperial thread it happened to be but tapered so it would lock in just before the flat washer face went flush with the manifold. So the depth of the adapter was the same as the alloy thickness. That way the probe was well into the coolant.

[Gampy]

5 * .039 = .195 ... That's pretty short, though it might be enough.

Vlad01, don't know what y'all call it, we (US) call it Pipe Thread ...

For those that don't know, Pipe Thread is a tapered thread, to intentionally thread bind pipe fittings causing them to tighten and seal.

[vlad01]

All I know it was non standard US pipe thread not the normal BSP we have here hence why I had to have it custom made. Even when I tried to get the coolant drain plugs and oil gallery plugs it was hard to find here, nothing fit until I worked out it was something other than BSP. NTP or something like that I recall it was called. Had to special order it.

[antus]

So many pipe standards. BSP is British Standard Pipe (thread), and most common in au, and NPT is National Pipe Thread, the American one Gampy is talking about. Both are tapered, and are close enough to each other to make you think you have the right thing sometimes when you dont. BSP is quite common in AU but NPT turns up a lot in cars for obvious reasons. You often see T pieces with either BSP or NPT on one end of the T and one each of the other two on the side so you can plug in American sensors in to BSP vehicles etc, but its hard to eyeball whats what in such a T on the shelf.

[vlad01]

Yeah I couldn't find NPT plugs for my car in any stores, ended up ordering them from somewhere and that is what ended up fitting. It was confusing as all the other sensors were metric threads, including metric tapered thread on the MAT sensor. And since the engine has metric threads externally imperial internally I thought it had to be BSP as that is imperial in my eyes. Didn't really know there was another imperial pipe thread since I never used it in any other field.

[Gampy]

Thread hell ... And I don't mean just Pipe, all of them!

Sure would be nice (or would it??, Hmm!) if we all used the same thing.

To us here, seeing BSP looks like an NTP that someone has crammed in the wrong hole and rounded off the peaks and valleys of the thread, BSP has rounder peaks and valleys, while NTP has sharp peaks and valleys, this is accomplished on the BSP by having a steeper angle on the threads, the thread pitch is the same.

[vlad01]

Pretty sure the rounded thread is to allow room for teflon tape without the thread cutting through it. A lot of the cheap pipes at the hardware store have sharp threads and the tape just cuts up to bits when tightening it.

[v6bucket]

NPT is very common in hydraulics & easy to pick up in places like Pirtec etc. NPT on some sizes has 1 less thread than BSP, both BSP & NPT are available in tapered or parallel thread forms.