I am requesting a machine shop to create a stud that will let you install a knock sensor mount on the factory NB2 location.
The stud will be m8x1.25 on one end and m10x1.25 on the other end.

As this would be 'one-off', does anybody want one allocated for them before I only have 4-5 made? A mild steel stud would be ~$12 shipped. I am waiting for a quote on how much it'll cost to be made in stainless steel.

EDIT: The stud's been made. Please send me a PM if you are still interested

 

If you get a batch made, I'll take one.

 

I do! I have a 1990 and the location I tried hacking it on to isn't working either. Is this bolt made to mount it onto the engine mount location?

 

The NB's (not sure about the other generations) have a factory knock sensor that's threaded for m10x1.5. It's near impossible to find a step stud that goes from M10x1.50 to M8x1.25 as such, I needed to have one custom made. This might be an NB block exclusive option.

 

I think 1.8L exclusive. My OBD2 NA8 block is tapped for it, need to confirm on my 95 block.

 

Just weld two bolts together. That's what I did.

 

If you make them, I'll take two.

 

Buy a motorcycle rear view mirror adapters. Thats what Flyin Miata sells as a kit. I bought mine on amazon.

 

I use , it's M10x1.25 however, for engine mount location like the old FM kit.

 

I was considering using that as well and I have no doubts the engine mount location works... but for not much more work, I could retain the location that Mazda picked for the oem sensor. I also read placing the knock sensor closer/in-between cylinder 2/3 was ideal.

 

Made something like this at work. Took a 10x1.5 bolt, turned it down and threaded it with a die, cut the m10 bolt head off. Very effective, and for knock sensing, I would suggest this over welded bolts, however I’ve done that in a pinch.

 

I would be interested if stainless. Is the nb knock sensor thread pitch 1.25 or 1.5? Weird mazda would thread that particular hole .5 but rx7's use the opposite. Seems they would be the same. I was thinking of using this and just tapping for m8x1.25: https://www.belmetric.com/metric-thr...rrmslo1fobmpf0

 

Damn,, I am probably out then. I totally forgot the 1.8 had a dedicated mounting location. I am on a 1.6 for now unless someone know a super affordable 1.8 dealer!

 

mcmaster.com

You're welcome

 

Update for people who are interested. The shop gave me a 2-3 week lead time. It will be made out of 316SS. There was a $2 price difference in Mild Steel VS 316SS and so for the additional rust prevention, I figured SS would be better for the small increase in price. Once I get the part, i'll sell each at $12 shipped.

 

So to confirm this will let you fit a standard Bosch knock sensor to the nb2 location (that if I'm recalling correctly also exists on the NA8 blocks?) I.e. M10 for the engine side and M8 for the knocked side? If so put me down for one!

 

Yup, M10x1.25 on one side and M8x1.25 on the other.

 

Sign me up for one of these too! Been holding off on a knock sensor too long but this is too easy.

 

+1

 

Tack two bolts...