Does anyone know of a thermostat neck flange that's available? I'm trying to build a straight pipe w a fill cap but I can only find these with built in ast tanks. Do the s5 aluminum pipes fit the fd?

Thanks!

 

I'm trying to figure out exactly what you're asking for... (but then again, I just had a bunch of caffiene, so I may be running on 'tard mode )

Are you looking for an oem filler neck, or an aftermarket one? If you're looking for OEM I could sell you my old one, as I'm running a modified filler neck/ast combo..

The s5 filler necks do fit the FD, they are used by people who want to delete the AST.

 

Lol, I'm talking about the entire piece. Exactly like your modified ast piece minus the ast! I guess you could call it the thermostat housing. I currently have the oem fd piece with the fc filler neck. I'm looking for a housing flange to make my own housing.

The fd housing appears too tall to clear the hood on the 20b when moved forward. Thinking a straight pipe with a filler neck welded on would be great.

 

Ah! I gotcha. I'd have to ask Brian where he got the mounting flange he used for mine.

Mine for comparison sake:

And the flange you want (with a good reason NOT to use cheap AN fittings ):

 

Dude, that's exactly what I'm looking for minus the bottle.

 

Apparently Brian just fabricated mine out of some metal stock, so I can't give you a quick and easy source

Maybe just give your fabricator the stock neck to take measurements from and he/she can fab you one to match the stock dimensions.

 

Well I appreciate the help. If the S5 3 bolt neck is the same, then I could chop off the flange from an aluminum version neck. Just need to confirm the bolt pattern.

 

I don't believe there's a pre-made flange anywhere. The S5 neck stock is plastic, I know aluminum ones are sold but I think they're aftermarket. I'm not sure where they are available from or how much they run.

Also, the '86-88 S4 RX-7 ran an aluminum water neck but it's a 2-bolt flange, not even close.

Dale

 

Here you go...


FD3S Thermostat Flange/Outlet - Turblown Engineering

 

99.00 seem a bit over priced IMO.
You could make one for maybe 30.00

 

OK,
Was just providing Monsterbox a source.

 

Thanks Dale,

Do you know if the 3 bolt pattern of the S5 flange is the same as the FD? If so I'm going to purcahse an aluminum S5 and have welded a radiator filler cap.

 

Spot on, thanks alot. Price is high, but it is billet aluminum and prob at least an hour of time to fab. I may try to use a cheaper s5 aluminum neck if possible, but this is the option.

 

I want to say that Pro-Jay sells a thermostat cap conversion to NPT for the 3rd gen, but cant find it on ttheir page. Here's a link to what I am talking about:

Mazda RX7 Thermostat Removal / Hex Style / Water Pump Adapter Flange

 

Fendamonky (or anyone else who knows) is there a certain height to weld the AST to the neck? Like should there be 2" above the neck so the neck doesn't suck in air? I just don't want to get mine too high or low..

 

We have them being laser cut now, be available in a week or two.

Just like the one in this picture 1/2" aluminum, 1.5" ID

We have a 1.75" ID in stock but you would then need to weld on a reducer down to 1.5" if you are planning on using the factory diameter hoses/radiator.

 

^ OoOoOo I may need to get one of those! Hopefully thats not going to be 99.00! :-)

 

$40.00 + shipping

 

I will need to pick one of these up for sure!

Anyone with feedback on where to weld this on to the overflow?

 

I used a Moroso 1.5" dia. filler, cut and welded it on

 

coincidentally, I just ordered an s5 aluminum neck and this Moroso pipe, planning to cut and have weld exactly like you Wish I knew about the laser cut flange earlier on.

Thanks

 

That was a mistake, since the S5 is not remotely the same bolt pattern

 

That looks awesome... Why didnt they do this from the factory? The surge tank setup is just cluttered!

 

Cool, keep us posted when yours in 1.5" is available

 

1.5" ID Flange now available 13B-REW Thermostat Housing Flange