The V8 Owners Forum -

Does anyone know what thread size this air temperature sender is? It's for a Megasquirt ECU and is approximately 16.7mm outside dia.

Follow up question ... Any idea where I can get one nut and two washers so i can fix it in my air intake?

Thanks.

M18 x 1.5 is the common one.

Most common way to mount it is to get a threaded bung (Ebay, etc) and weld or glue that to the housing.

Where you actually situate the ATS is open to debate.

Pretty sure those air temp. sensors in your pic have a tapered pipe thread (3/8 NPT I think?) meaning you cannot get a nut to suit:(

conrod wrote:Pretty sure those air temp. sensors in your pic have a tapered pipe thread (3/8 NPT I think?) meaning you cannot get a nut to suit:(

You will find 3/8" npt nuts on ebay.

All npt, bspt and bspp fittings will have a nut available for it.

Think the answer is it depends on the sensor you use.. I know mine is 18mm as I have the tap I used for it on my home made ally trunking, and it's the only one approaching that size I possess.

But 14mm appears to be another common size.

http://cgi.ebay.co.uk/200911963744

Hi
I have one of those, it is 3/8 NPT I just mounted a piece of 10mm ally inside the manifold and tapped that, the tap came from china for about £10 and was with me in under a week, they are very pricey from the UK!
Best regards
Mike

Thanks all and I see that 3/8 NPT is 17.145mm so near enough my measurements so I'll try and get a nut and washer.

The only place I can mount it is in the (Hotwire) rubber inlet hose (immediately after the air filter) to the plenum so I think I'll go for a nut and washer connection. Otherwise it would have to be a tap directly into the plenum casing and that's not easy as my bonnet is so close. It won't fit into my air filter either.

If that does not work a new hose is not the end of the world.

Finding one is not easy! Can't find a nut anywhere (apart from USA) so anyone any ideas, please.

(It does seem that they are used for electrical junction boxes, though.)

American NPT would be a taper thread surely ? So not likely to get a nut ?

Just buy a tap and tap the hole, or a chunk of metal or whatever you need to screw it into.

certainly any electrical product within Europe should be metric, M16, M20 and M25 being most common.

richardpope50 wrote:Finding one is not easy! Can't find a nut anywhere (apart from USA) so anyone any ideas, please.

(It does seem that they are used for electrical junction boxes, though.)

Most usual electrical size was 3/4" now 20mm - but that is miles too big. I dunno what the actual thread size is or indeed type - that is what the conduit boxes are called. There's probably a wider range of nuts available from a decent plumber's merchant, if it is BSP.

How about cutting the trunking hose and inserting one of the tubes with a threaded bung from Ebay? That's more or less what I did - but to replace the AFM.

Or just buy a sensor with a more standard thread size ?

Thanks for suggestions but seems an expensive nut all ways round.