The Mazda 3 Rear Motor Mount 2.0: Back & Better

We here at CorkSport are proud to announce the relaunch of the Mazda 3 Rear Motor Mount.

Yes, you read that correct, this is a re-launch. At CorkSport we push ourselves to design and develop new and interesting products every day, with that, we try new and innovative manufacturing designs and methods in an attempt to create exceptional, competitive, cost-effective products for our loyal customers.

Sometimes those new and innovative manufacturing methods end up not being as awesome as we originally expected. This is just part of the designing and learning process. Let’s get into the details.

The original, let’s call it V1, Mazda3 RMM used a new-to-us manufacturing method of applying the polyurethane to the billet aluminum body called vulcanizing. The billet aluminum body and the steel sleeves are mounted in a fixture then liquid polyurethane was poured into the assembly and cooled until the polyurethane had set to the final hardness.  This process appeared to be very promising; each part was set up identically, it was nearly impossible to have any missing parts not sent to you, and most importantly the polyurethane was adhered to the billet aluminum body and therefore could not fall out.  More on that last bit later.

We moved forward with the manufacturing method and had a few samples made with various polyurethane durometers ranging from 60A to 80A.  After various testing, we determined that 70A was the best compromise of response and NVH (Noise, Vibration, Harshness) experienced by the driver. We continued testing for a few months to verify long-term durability and found no issues.  Hooray! We moved forward with production to get this new great Mazda6 RMM out the door to you.

Unfortunately, it appears that our testing period just wasn’t quite long enough.  Eventually, the polyurethane would fail but fail in a style we had never experienced before.  Long story short, polyurethane has excellent compression strength compared to the tensile strength.  The polyurethane was being pulled/split apart due to the forces of the engine.  

Now we had a few options of how to redesign the Mazda 6 Rear Motor Mount after going through the failure analysis.  

  • We could have simply stuck with the same design and just increased the stiffness of the polyurethane.  Increasing the durometer rating of the poly increases the tensile strength, but this would have resulted in an unsatisfactory driving experience for you which was unacceptable.  
  • The other option was to start from scratch again to create a new design that did not compromise the driving experience or the durability; with challenge comes innovation.

Again we went through many different designs, with the greatest challenge coming in the form of retaining the polyurethane pucks.  Typically the polyurethane pucks are retained by whatever the mount is bolting to, but with the Mazda motor mount, the steel sleeves extend far past the outer edge of the polyurethane pucks.  This leaves the pucks free to slide out of the billet aluminum body and cause a major failure.  

Using the conventional polyurethane puck style, we developed a design that would work, but more than doubled the number of parts needed which increased the chance for something to go wrong and drives up the cost.  This design is shown below:

 

The red arrows show the direction the conventional polyurethane puck would slide out of the body.  The red circles show the puck retention system to hold the washer and pucks in the body.  This retention design required many parts to be successful.

With the cost going through the roof we had to go back to the drawing board. There had to be a better way… and there was.  

The third major iteration shown above solved the problems of the V2 design and got us away from the vulcanized polyurethane of the V1 design.  Things were looking good.  With the V3 design, the polyurethane pucks are pressed into the billet aluminum body.  The pucks have ribs, shown with the red circles that are just large enough to keep the puck in place, but small enough to let the puck be pressed into the body.  

With this, we were able to make some clever designs to the RMM to keep it centered in the engine and chassis brackets on the vehicle.  The smaller diameter puck extends out to the ends of the steel sleeves; this keeps the entire rear motor mount centered.  The large diameter puck retains itself in the body and allows the associated steel sleeve free to slide for easy installation; shown with the red arrows.

Now… does it work? YES! Pretty fantastically, we might add!  

We have had this design on a handful of vehicles, one of those being the CorkSport Mazda 3 Racecar during the SCCA Run-Offs at Indianapolis Speedway.  Other than some dirt and grime, the tested RMM looks great.  

You were probably expecting this blog to be all about the details and reasons you should buy this performance RMM for your Mazda 3, Mazda 6, or CX-5.  All those details can be found on our website, and I invite you to check them out.

What we really want to get across here is this:

First and foremost, we will always do the best we can to take care of you and your car if there is ever an issue or concern with your CorkSport part.  

Second, if you are a driving enthusiast, if you go driving for the sake of just driving, then you need this RMM in your life. It will completely change and improve your driving experience, plain and simple.  

-Barett, CS Engineering

 

Introducing: The CorkSport Performance Polyurethane Exhaust Hanger Kit

The exhaust system on your Mazda is a loved and cherished part of your car’s character and performance.

It emits glorious sounds that keep you entertained and smiling from ear-to-ear, but if you can believe it, is only attached to your Mazda by a few soft rubber hangers.

Yes, your hard earned stainless steel exhaust is ONLY suspended by small pieces of rubber…

Here at CorkSport, we think it’s time that you show your exhaust system some love… it’s time to take the rubber off.

We present to you: the CorkSport Performance Polyurethane Exhaust Hanger kit.

This kit replaces the four rubber exhaust hangers that would otherwise be used to mount and suspend your CorkSport Performance Exhaust System; the two rear hangers on the axleback section and the two mid-pipe hangers.

But why is polyurethane better?

Well there’s a few reasons:

  • First, polyurethane is more durable and heat resistant than rubber so the hangers will perform better for a much longer period of time.
  • Second, and most important, the polyurethane used in the CorkSport Performance Kit uses a stiffer compound compared to the OE. The polyurethane hangers have 75A durometer stiffness vs the OE rubber at as low as 50A durometer. The increased stiffness helps minimize the movement of the exhaust while still providing the necessary flex between the car chassis and the exhaust system.

All-together, this means your performance exhaust system for you Mazda 3, Mazda 6, or Mazda CX-5 will not be able to move around under the car during spirited driving such as back roads, auto-crossing, or whatever motorsport event you prefer.

Keeping your exhaust system in places reduces your chance of damaging your beloved Mazda or the exhaust; it’s a win/win.

-Barett @ CS

PS: In addition to these hangers, we also carry the following other exhaust hanger options:

CorkSport Headlight Leveling Link

It’s fair to say that we all love the look of a lowered car, especially when it’s your car right? However what we don’t love is lowered headlights, but sadly that’s a result of your ride’s new look. There are less desirable ways to fix the new lowered headlight issue and there are correct ways. Here at CorkSport, we wanted to provide you the correct method to get your headlights back in line.

Light Leveling Kit | CorkSport

Continue reading “CorkSport Headlight Leveling Link”

The New CorkSport Mazda 3 Rear Motor Mount

Feel like your SkyActiv-powered Mazda is lacking a bit of throttle response and driver feedback?

We hear you, that’s why we’re introducing the all new CorkSport Race Rear Motor Mount for 2014+ Mazda 3 and Mazda 6, as well as 2013+ Mazda CX-5.

CorkSport Mazda 3 Rear Motor Mount

Manufactured from 6061-T6 aluminum and anodized, the CorkSport Race RMM is strong, durable, and lightweight. What truly sets the CorkSport Race RMM apart from the competition goes to the 70a polyurethane. This RMM does not use polyurethane inserts that can loosen up and degrade. The 70a polyurethane is poured directly into the mount for a permanent bond with the aluminum body and bushing collar.

CorkSport Mazda 6 Rear Motor Mount

More than a handful of prototypes have been tested to ensure that the product arriving at your door is the very best it can be. We tested different durometer polyurethane from 60a to 80a (as well as different bushing sizes) to find the maximum improvement of throttle response and driver feedback without excessive noise, vibration, and harshness. Check out one of the prototypes below.

CorkSport Mazda CX-5 Rear Motor Mount

Now you might be thinking: “How does a motor mount improve throttle response and driver feedback?” In FWD vehicles it is typical for the engine to be oriented in a transverse layout. This means the engine is parallel to the axle centerline, whereas in a longitudinal layout (typical of V8’s and RWD vehicles) the engine is perpendicular to the axle centerline. Anyway, the engine/transmission applies a rotational force (torque) to the drive shafts, in turn rotating the wheels/tires forward.

“For every action there is an equal and opposite reaction.” – Newton’s third law of motion.

The amount of torque applied to the wheels is equal and opposite to what is applied to the engine itself, but what keeps the engine from just rotating? Enter the engine mounts. Unfortunately, the OEM engine mounts are very soft, so the engine is able to move and rotate substantially while driving. This makes for a very plush ride inside the cab, but sacrifices throttle response, driver feedback, and really the general driving experience. Replacing the RMM drastically reduces the amount of rotation the engine is allowed which in turn forces more of the engine’s torque to the tires sooner instead of just rotating the engine in the engine bay. This holds true for any action that affects the engine: throttle inputs, up-shifting, down-shifting…etc.

CorkSport Mazda 3 Rear Motor Mount

For just $129.99 you can’t go wrong. Improve your vehicle’s performance with the CorkSport Race RMM, and pair it up with the CorkSport Short Shift Plate and Shifter Bushings for the ultimate performance package!

-Barett, CS Engineering

Barett Strecker-01

Product Release – CorkSport Camber Plates for the 2014+ Mazda 3, 6 and 2013+ CX5

 CorkSport Camber Plates

CorkSport is proud to release Camber Plates for the 2014+ Mazda 3, 2014+ Mazda 6 and the 2013+ CX5.

Axm-3-303-Camber-Plates-blog600b

Our camber plate kit is an ideal option for people that are looking to enhance their driving experience with precision camber settings. Whether tuning your Mazda for performance or track, these camber plates will allow the precision adjustment. The CorkSport Camber Plates have been designed with solid pillow-ball bearings and housing that reduce unwanted upper strut mount deflection and are ideal for racing or high performance driving.

Mazda Camber Plates

The CorkSport Camber plates are engineered and CAD designed for precise fitment then CNC machined from anodized aluminum.  The Camber Plates can be installed without modification to the strut tower but camber adjustment will require removal of the strut assembly. Alternatively, with just minimal cutting of the strut tower camber can be adjusted with just a small hex wrench.

Precision adjustment, durable design, and a great price all add up to the best Camber Plate on the market.

Order yours today – CorkSport Camber Plates – Only $359

Camber measurements will vary depending on vehicle model.