Boomba Racing

iTrader: (6)

Objective

The objective of this experiment is to determine flow rate capacities of an OEM CZ4A fuel rail and a Boomba Racing CZ4A fuel rail.

Theory

As a volume of fluid passes through a given surface over a certain period of time, a volumetric flow rate can be calculated. In order to simplify equations, the surface will be assumed to be a flat, plain cross section. It is also safe to assume that the fuel rail holds a fixed volume. Consider the flow to be steady, and no fluid accumulates. Therefore, conservation of mass holds true since the amount of fluid flowing into the fuel rail is equal to the amount of fuel flowing out of the fuel rail. Density of the fluid will not change within the fuel rail.

Equipment List

OEM CZ4A Fuel Rail
Boomba Racing CZ4A Fuel Rail
Brown & Sharpe Electronic Caliper Part No. 00590090/Serial No. 2P 2854 06

Procedure

Part A

Upon visual inspection of the two fuel rails side by side, there is a size difference of the inlets as seen in Fig. 1 below.


Measure the inlets on both the OEM CZ4A fuel rail and the Boomba Racing fuel rail. For illustrative purposes, Fig. 2 and Fig. 3 depict measurements based from the Brown & Sharp Electronic Caliper.


Reconfirm measurements with use of gauge pins.

Part B

Remove the fitting supplied on the Boomba Racing fuel rail that allows mating of OEM fuel lines to rail and measure the inlet. Again, Fig. 4 is attached for illustrative purposes.


Data

Part A

OEM Fuel Rail diameter:
Inlet: 0.193 [in]

Boomba Racing Fuel Rail diameter with Fitting:
Inlet: 0.228 [in]

Part B

Boomba Racing Fuel Rail without Fitting diameter:
Inlet: 0.690 [in]

Analysis of Data

Flow rate for this experiment can be defined as:


In order to compare these two fuel rails side by side, velocity is chosen to be a constant to express flow rate characteristics.

Cross-sectional area of a circle can be defined as:


Part A

OEM Fuel Rail average cross-sectional area:
Average: 0.029 [in^2]

Boomba Racing average cross-sectional area with fitting:
Average: 0.041 [in^2]

Part B

Boomba Racing average cross-sectional area without fitting:
Average: 0.374 [in^2]

Discussion of Results

With velocity being the same, then as cross-sectional area increases, so would the flow rate. Looking at each fuel rail individually, the maximum flow rate able to be achieved would be at the minimum area. It so happens that it would be the inlet of the fuel rail that causes the most restriction.

Part A

OEM Fuel Rail area:
Minimum: 0.029 [in^2]

Boomba Racing Fuel Rail area with fitting:
Minimum: 0.041 [in^2]

The Boomba Racing Fuel Rail with fitting has a cross-sectional area that is 1.4 times larger than that of the OEM Fuel Rail.

Part B

Boomba Racing Fuel Rail area without fitting:
Minimum: 0.374 [in^2]

The Boomba Racing Fuel Rail without fitting has a cross-sectional area that is 12.8 times larger than that of the OEM Fuel Rail.

Conclusion

Keep in mind that these results are for the two fuel rails tested. Since these products are both mass produced, tolerances have to be tight. However, there may be a slight variation from piece to piece. This experiment tried to isolate as many variables as possible and employed different measuring techniques in order to minimize errors. Assumptions made were viable in this experiment, since tolerances were to the 0.001". Any neglected variables would fall into these tolerances.

The Boomba Racing Fuel Rail has the potential to outflow the OEM Fuel Rail by 1.4 times with the fitting and by 12.8 times without the fitting, since the flow rate and area exhibit a linear relationship.




This may seem like quite trivial work, but we here at Boomba Racing put this much time and thought into evaluating each of our products before any production begins. Rest assured that everything is designed, manufactured, assembled, and tested in house.

BIGLOU58

iTrader: (1)

nice write up very informative

scheides

iTrader: (10)

Great info, this is next on my list! Hopefully give me some headroom on my FIC1680/walbro400/BAP setup with the EF4

Hiboost

iTrader: (9)

Do you guys recommend any specific kind of AN fittings to be used with your fuel rails?

Boomba Racing

iTrader: (6)

I'm glad this was of help.

Will definitely help in the head room department.

We make our own AN fittings and adapters that you could take a look at.

Boomba Racing

iTrader: (6)

Oh just remembered, some fittings may be too large to fit the rail. Our fittings are a guaranteed fit.

eling99

iTrader: (55)

I'm going to get tuned next week and having 1100 injectors installed. Would it make a difference if a fuel rail is installed?

Boomba Racing

iTrader: (6)

It will not make a difference tuning wise.

It will, however, give you more head room to play around with. It would be a lower IDC with our rail vs. OEM.

scheides

iTrader: (10)

Can you post some pics? I don't necessarily. Are about seeing the ones that don't fit, but if you guys have a nice fitting/hose setup for a fpr I'd be way interested!

Boomba Racing

iTrader: (6)

Keep in mind that we include a plug for the FPR in our kit if you ever need it.


Other fittings may be too large to fit into this location. Notice the clearance. This is our O-8 to AN-6 fitting.


We also have FPR Adapters, both straight and 90 degree elbows (pictured)


Turns it into a female AN-6.


Need a male end? Not a problem with our O-6 Male to AN-6 Male fitting.

Don't want AN- ends? We have a solution for that as well, we offer clamp style and push lock style barb fitting ends!

scheides

iTrader: (10)

Nice, do they come in black? Your -6 fpr adapter plus a 90 degree hose adapter would be perfect for an aftermarket fpr, should be a very easy add-on.

Boomba Racing

iTrader: (6)

The FPR Adapters come in Natural, Red, and Black finishes. Our fittings come in Red and Black.