Moroso NC Aluminum Coolant Expansion Tank
2006-2015
PART NUMBER: 61-2037
DESCRIPTION
Forever fix the risk of your NC motor overheating because of a stock expansion tank failure. The NC is the ONLY generation of Miata where the overflow is a pressurized critical part of the cooling system and when the original plastic version fails you can have the motor quickly destroyed with overheating, often before the driver has a chance to notice the temp gauge spiking upwards. This all metal tank prevents that potentially very expensive failure.
9/2020 Update: Our Coolant Expansion Tank is now endorsed by Mazda Motorsports as a recommended part of the cooling system upgrades for all Spec MX-5 Race Cars!
Direct replacement for your factory plastic coolant expansion tank. Made in the USA, all aluminum with beautiful TIG welding. Constructed with internal baffles and a machined aluminum neck that takes a factory cap. All of the inlets and outlets are positioned to match up with the factory hoses. The tank mounts to the same location as the factory tank and is built with the same dimensions for an easy fit. Includes view window on the side to check coolant level.
OPTIONAL Cap:
Option is to add a high performance CSF 20 psi radiator cap. These tanks are compatible with the factory cap, so replacing the cap is not mandatory, but if you need a replacement for your used factory cap then this is the best option, and higher pressure than the factory 16 psi cap!! A true high performance cap to match your high performance expansion tank.
NEW optional satin black powdercoated finish offers a more subtle option than the bare aluminum. The satin black is a low-gloss finish that looks right at home in the NC engine bay, unlike a wrinkle or high gloss black that matches nothing around it. Some other examples of powdercoated tanks done by individuals or other shops make the mistake of coating the nipples where hoses and cap attach. That is a no-no! This premium powdercoating is done at the factory the correct way with all critical areas properly masked so that you get a great looking finish without compromises.
Stock plastic tanks are ticking time bombs because as they age they crack and when they crack the coolant pressure is lost and the motor overheats. Unlike the earlier Miata where an overflow leak was not big deal, the NC relies on this tank to be a pressurized part of the cooling system, as soon as a crack forms pressure loss causes the engine to overheat and the motor is usually destroyed. We have NC Generation Miata arriving on flatbed tow trucks every week with blown motors because the owner didn't change the plastic tank until too late. So we decided it was time for a "lifetime" solution. This tank is the solution. It will not fail over time like the factory tank, and looks great as well!
Installation NOTES:
CLAMPS: While the factory squeeze-clamps on the hoses can be re-used, they get weaker the more they are removed/installed and having a tight seal on all the hoses is important since this tank is pressurized. We recommend changing the squeeze clamps out for worm drive hose clamps which can be found at any auto parts store. #4 worm clamp (x2) for the top two nipples, #10 worm clamp (x1) for the bottom.
CAP: You might need to very slightly adjust the 'tangs' on the factory radiator cap to fit the new metal neck with same tension as it did on the factory softer plastic neck, takes a few seconds to do with pair of needle nose pliers.
Great write-up of the install process over on the Revlimiter blog:
https://revlimiter.net/blog/2017/02/goodwinmoroso-nc-coolant-expansion-tank/
YES, there is a view window on the side so you can see coolant level, see it in that window and you are good to go!
Optional satin black powdercoated finish!
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Customer Reviews
Moroso NC Aluminum Coolant Expansion Tank
I went straight for this aluminum tank since it's recommended by Mazda for racing and mainly since Goodwin racing is dedicated to the Miata! They get dibs if I need something that is required.
Anyways remove the battery cover as it's in the way.. have a bucket under the tank location as you will lose about a half cup or coolant. Buy a siphon mechanism from Walmart or wherever for under $15 to siphon the coolant into a bucket to reuse (I used a big pickle jar lol). Be sure to buy some clamps, more specifically for the tube under the tank as it didn't fit for me. The 2 above can be reused although I already had 2 new ones on hand so I replaced them.
Also one review I read about this, someone had said the stock coolant cap didn't necessarily fit and recommended that you buy it with a new cap. I had already bought FM 16psi cap and that fits perfectly. Lastly, I added a little more than a half cup of coolant due to spilling some.
Great product and I appreciate the installation videos. My original tank was 17 years old and yellow. I knew it was only a matter of time before it cracked.
Quick and easy install. Looks better and gives peace of mind that it won't crack.
After purchasing my MX5, I spent an excessive amount of time trying to figure out what modifications I would do first. It wasn't hard to figure out that replacing the coolant expansion tank would be first on the list. Destroying a low mileage motor if that yellowed factory tank ever ruptured wasn't my idea of a good time. The cheapest route would be to replace it with another factory plastic tank. In the middle were a few different aftermarket tanks of indeterminate origin. The most expensive option would be to make a "buy once and cry once" decision to purchase and install a Moroso-made aluminum tank. I decided to spend the money, as this was a low-mileage car that I planned on keeping for a long time.
I don't regret that decision for a minute. The tank was shipped out quickly and installation was easy. The thick paneled aluminum construction with what appears to be tig-welded joints adds a hand-fabricated look to at least one part of the engine compartment. Having a Moroso tank is also a dog whistle of sorts to other Miata owners that you are serious about your car and willing to do things right the first time.
The purchase was made from Good-Win Racing simply because they had the best price I could find. I am happy to report that every aspect of the purchase was easy and trouble-free. After the sale, I wrote to Good-Win for their advice about purchasing other products for my car and Brian wrote back with a detailed answer in under an hour. Sadly, customer service like this is almost impossible to find these days and it is refreshing to find. Buy with confidence, both in the product and from Good-Win.
Compared to the other expansion tanks, this is way more expensive but worth it. Build quality is excellent and it's internally baffled correctly like the OEM tank to prevent aeration and sloshing of the coolant. Other aftermarket tanks do not have this feature. Minor nitpick is that the cap is very hard to get on. I wouldn't hesitate to pay the extra money for this product over other expansion tanks.
Great product! Fit and finish are terrific.
Replacing the lower spring type hose clamp is required as the tank nipple is too large. The other spring type clamps work, however I decided to replace them all.
The higher pressure cap also works well!
Good fit, easy install. On the hose clamp comments - it'd probably be nice to have them as an option, but mine were fine.
Very nice part just installed it today looks great with the new Goodwin brushed aluminum strut tower brace that I purchased earlier this year. It's a good idea to buy those worm drive clamps it makes it a lot easier to install, the old top spring clamps were not tight enough and the bottom spring clamp is too small to fit over the new tanks tang. I wish I would have bought the power steering reservoir tank also with all the shiny bits it looks old and out of place. Well, I'll save that for next year!
Rick
Tank was in the plans but my old tank unexpectedly moved my plans up. After searching reviews online I decided to go with this tank. It was exactly as I thought it would be and looks really nice in an otherwise kinda dull looking engine bay. Shipping was fast. Was very happy.
I have not installed this yet. However, many decades ago I worked for a Ford sub-contractor in England welding car seat frames. The units per hour per welder demand was ridiculous, and to meet that production demand the welders had to crank up the amperage and "stitch together" the components so as not to 'burn through' the components. The welds were not uniformly pretty.
The welds on the Moroso tank are beautiful, indicating that production quality for Moroso far outweighs numerical quantity.
This is a very nicely constructed part.
Love it! It was easy to install. Suck out all of the fluid in the coolant tank and unhook it with some towels underneath to catch what fluid remained. Put the new one in and refill the tank. The only suggestion I have is that Goodwin should have an option to order with the new clamps. The extra $5-6 would save us from having to drive around trying to find them.
Bought this as my coolant tank had gone yellow, plus my engine has already been replaced once under the previous owner. To me this is definitely a buy once, cry once product in that you never need to worry about the coolant tank exploding... ever. Installation went well although the mounting tabs on the coolant tank were a little finicky to get over my mounting points on the car. Note that you'll also probably need to run different hose clamps to make sure your coolant lines stay nice and tight.
It looks beautiful in the engine bay and I highly recommend not cheaping out on this portion of your engine.
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