In order to satisfy our needs of a fuel system with (4) injector ports on the secondary fuel rail, we turned to the fueling experts at Radium Engineering. When it comes to fuel systems, Radium has highly-engineered solutions for virtually any application on the market. They are constantly innovating and creating amazing products that work extremely well and make the lives of their customers and builders better.
We went with their Top Feed Fuel Rail Conversion, Mazda 13B-REW Secondary to satisfy our needs for (4) fuel injectors on the secondary rail. We used Radium’s Top Feed Fuel Rail Conversaion, Mazda 13B Primary because of the large -8AN inlet and outlets, which will match the sizing of our fuel line.
Radium’s direct-mount Fuel Pulse Damper normalizes the fuel pressure reading by using an internal diaphragm to absorb the oscillating pulses created by the opening and closing of the fuel injectors. This pulse damper has many additional benefits such as reducing idle surge due to high flow injectors, and often improving or solving issues with erratic lean air/fuel ratio spikes which can create ‘stumbling’ of the engine that are difficult to tune out.
I really like Radium’s Direct Mount Regulator. This compact fuel pressure regulator mounts directly to the fuel rail which makes packaging very clean and simple. This regulator features the first tool-less pressure adjustment with a simple knob that allows for quick and easy pressure adjustments.
Radium’s Low Profile Swiveling Fittings are extremely well-built with an improved “banjo-fitting” design that reduces pressure loss, looks great, and opens up a lot of packaging options that are not possible with standard 90-degree fittings.
The stock primary fuel injector ports are located on the center iron of the engine block.
Radium’s Top Feed Conversion, Mazda 13B Primary Fuel Rail Kit includes these high quality, anodized billet aluminum o-ringed injector seats, which are the nicest injector seats that I have seen on the market. This further showcases the attention to detail that Radium puts into their products.
We then installed the Deatschwerks 1,500cc injectors, Radium Engineering primary fuel rail and included thermal spacers to reduce heat transfer from the block into the fuel rail. We used -8AN ORB to -8AN Male Radium Low Profile Swivel Banjo Fittings to connect the fuel lines to the primary rails.
We then attached the Radium Fuel Pulse Damper to the -8AN ORB port on the primary fuel rail. I really appreciate and am a fan of the level of engineering that Radium puts into their products. The location of the Fuel Pulsation Damper clears the factory and many aftermarket upper intake manifolds, in a clean and simple packaging that does not add a lot of extra lines and complexity to the fuel system.
7 comments
I am still here, consuming every FD update. This thing gets more awesome with every post!
Thank you 🙂
Great series. What’s the story with aluminium fuel hardline and ethanol-based fuel? My (limited) understanding is that aluminium needs to be anodised at minimum to protect it from the jungle juice.
Yes, ethanol can corrode aluminum, particularly when it contains water or in high-concentration blends The alcohol reacts with the metal to form aluminum alcoholate, causing white, chalky corrosion, pitting, and potential, severe damage to fuel systems.
Thank you. E85 is hygroscopic and will absorb water which can lead to aluminum corrosion only if it sits for long periods of time. Raw ethanol is generally safe for aluminum. Since we will not store or let the car sit with E85, running the aluminum hard lines will not be a problem. We will also be running drums of Ignite ethanol, so that further reduces this concern.
Very cool updates.
As part of the testing you’re doing for the single pump setup, how does the cost of making the larger aluminum fuel feed line compare to adding a 2nd fuel pump and using the stock feed line?
There are many solutions to a given problem. We wanted to find the maximum power the 415 LPH DW400 fuel pump can support on a rotary without fuel line restrictions. Once we reach that point, we will turn to a brushless single pump solution based on the layout of our fuel starvation solution in the previous article.