Re: Fan Clutch to Radiator Distance 07-20-06 02:47 AM - Post# 972016 In response to MG66Biscayne I don't know if this will help. Selected range of design factors for testing. 21 inches horizontal on the radiator side. Hey guys. Actually..yes it will make a difference. Choose a web site to get translated content where available and see local events and Radiator Shroud Fan. I have a stock SBC 350 in a 1931 Model A Sedan. Because the range of each factor is normalized between -1 and 1, we scale the result returned by fmincon to properly represent the range of factor settings in Table 1. Table 1. Green lines show the model fit, red dashed lines show the 95% confidence interval, and the purple vertical cross-hair lines show the current values of the selected factor and response, which can be interactively changed to evaluate the model. The fan blades should be 1/2 in, 1/2 Figure 1. 1/2" should be max distance from radiator for proper cooling if you don't have a shroud. Figure 2. Einstein, http://www.chevynova.org/TomWilliamsCollection.html, Gen4Novas : 1975-1979 Chevy Nova Resource Directory, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I have a brand new radiator and no A/C (yes, it is getting a wee bit hot driving in Houston...), and I have about 2" from the front edges of my 6 blade flex fan to the to the radiator (standard, non-clutched fan). To find the optimum fan performance, we use the fmincon function from the Optimization Toolbox to solve our constrained optimization problem: The optimization function, f, is the quadratic equation with the coefficients (s.beta) from the regression performed in regstats. 1970 Nova 396...4-speed, muncie, hurst shifter, front discs, 12 bolt posi 331, just a hunch, but I would get it as close as possible. A garage full, Karen says she is a Nova widow. 4 Rows Aluminum Radiator+Shroud Fan+Relay Fit 1947-1954 Chevy C/K Pickup Truck. Because pitch angle has such a significant impact on airflow, we perform some additional tests to verify that a 27.3-degree pitch angle is optimal. This will allow mounting of the fan(s) without compromising the core of the radiator. The shroud can be very long also. 3. A correct OER® Authorized reproduction of the original style radiator fan blade which was installed as original equipment on various GM models with 18 diameter, 7 blade fan. Rated 4 out of 5 by Fdo62 from The product look is excellent I had problems installing this Blade fan, because the distance between radiator - water pump not enough. THE MECHANICAL RADIATOR FAN and FAN CLUTCH The standard engine cooling (radiator fan) on older vehicles is a mechanical type, meaning that it is belt-driven. Figure 3 shows how much each factor contributes to the total airflow. The mean airflow for our existing fan is 842 ft3 per minute with a standard deviation of ± 2 ft3 per minute. Click on image to see enlarged view. Figure 6 summarizes the result of our Monte Carlo simulation. Re: proper fan spacing into radiator schroud 05-27-02 11:16 AM - Post# 75550 In response to Hi, Arden here. We designed an experiment to investigate the effect of three performance factors: fan distance from the radiator, blade-tip clearance, and blade pitch angle. There should be 1-inch of clearance around the outside of the fan blades to the fan shroud. The quadratic model shows that the optimal pitch angle is around 27.5 degrees, corresponding to a maximum airflow of 882 ft3 per minute. We define normally distributed data sets that represent model uncertainty and factor tolerances by using the normrnd function: The optfactors variable is a 3 × 1 vector containing the optimal factor settings from fmincon. Click on image to see enlarged view. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. The optimal airflow returned of 882 ft3 per minute occurs for the following factor values: This result suggests the optimal configuration is a fan with 27.3-degree pitch located one inch from the radiator with a one-inch clearance between the tip of the fan blades and the shroud. We used MATLAB, the Statistics and Machine Learning Toolbox, and the Optimization Toolbox to improve the performance of an engine cooling fan through a Design for Six Sigma DMAIC approach. Figure 4 shows a response surface plot of our airflow data generated from the quadratic model. JavaScript is disabled. Works great. your location, we recommend that you select: . For example, on a '32 Ford, the area of a 15.50" fan is about 189 sq. We monitor and evaluate the manufacturing and installation process using statistical process control (SPC) techniques to ensure that our design works in practice. Besides getting a shroud, what would be the best way to close this distance? The data is best fit by a normal distribution curve. Simulations verify that the new design should produce airflow according to our specifications in more than 99.999% of the fans manufactured. Engineers and scientists use a variety of approaches to improve or design quality into products. We use a variable pitch test fan, varying the pitch angle in 0.5-degree increments from 15 to 35 degrees, and measure the airflow. Moved the radiator mount to passenger and forward, used a butchered F shroud, moved it and the radiator down in the mount. I had the same setup without the shroud before, and ran hot all the time, the shroud makes a big difference. The cooling system is an extremely important piece to any engine build. Now, the power difference of my new engine is extremely evident. I recently did an engine swap in my 73 Nova from the original Inline 6 to a 350 SBC. Cooling fan mounted behind the radiator and enclosed by a shroud to direct airflow through the radiator (image courtesy of Novak Conversions). Pitch is the dominant factor. 396 4row rad with ac is 1 1/8 from the rad to the front of the clutch. Also original bb fan shroud and original 5 blade fan. The Box-Behnken design with three factors generates 15 testing combinations (13 unique plus 2 repeats), as shown in Table 2. An initial condition, x0, is defined to start the optimization routine. approximately stock size, little less width little more height. The large linear pitch coefficient indicates that a greater pitch angle generally results in higher airflow, while the large negative quadratic term indicates that the relationship between pitch angle and airflow is not strictly linear. Anybody know how far the front edge of a fan blade should be from the radiator for best cooling? Test results from the variable pitch test fan. Next, measure the distance between the radiator core and the closest engine component. Selecting the proper fan is critical to cooling system performance. We use this value to estimate the effect of noise on our model. Fan blade sets deeper into shroud on the 4 row vs the 3 row due to the difference in the depth of the radiator mounting bracket and fan blades are closer to radiator core on the 4 row. We will first measure the current cooling fan performance to establish a baseline, and then determine the design factors that we can alter to improve the fan’s performance. 4 ROW RADIATOR +SHROUD FAN+RELAY Fit JEEP CJ5 CJ6 CJ7 &GM CHEVY SBC V8 … X3 = tip clearance between fan blades and shroud (inches). Click on image to see enlarged view. We set the distance and blade-tip clearance at the optimal values. Table 2 shows that the airflow varies significantly for the different factor combinations. Hope that helps. Our initial fan did not circulate enough air through the radiator to keep the engine cool during difficult conditions. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Edison, "The secret to creativity is knowing how to hide your sources." I am not sure I should post here. A quadratic model fit to the test results estimates a maximum airflow of 882 ft3 per minute at a pitch angle of 27.5 degrees, which verifies the accuracy of the optimal pitch angle calculated in our optimization. You want air coming through the radiator, not from engine compartment. Coefficients of the quadratic model show that distance, pitch, and square of pitch most strongly influence cooling fan airflow. 1972-1986 JEEP CJ SERIES CJ5 CJ6 CJ7 GM ENGINES. Without normalization, the coefficients of the factors will have to be adjusted for their unit values (e.g. Figure 6. The negative coefficient for distance reflects the fact that airflow increases when the fan is closer to the radiator. Visual display of the data from the Distribution Fitting Tool in the Statistics and Machine Learning Toolbox. We estimate that the cooling fan must pull in at least 875 ft3 per minute through the radiator to cool the engine adequately during difficult conditions. We can look at the relationship between multiple input variables and one output variable by generating a response surface plot. Figure 7. To measure baseline performance, we collect data from the existing fan. Click on image to see enlarged view. Car Radiator&Shroud Fan. The mean airflow is 882 ft3 per minute with a standard deviation of 2 ft3 per minute. Table 1 shows acceptable upper and lower bounds for the factors. We used our test data to estimate optimum values for each factor, resulting in a design that produced airflows beyond our goal of 875 ft3 per minute. Factors that we can modify and analyze for effects on fan performance include the fan’s distance from the radiator, the tip clearance between the fan blades and the shroud, and the blade pitch angle. Our model predicts that we should have no difficulty meeting our design objective if our assumptions about manufacturing variability are correct. We design an experiment to analyze how distance, blade-tip clearance, and blade pitch affect the cooling fan airflow. Other MathWorks country ; the core of the radiator is approximately 371 sq You should also measure the radiator core, which is the finned surface between the two tanks. Whichever you The fan is a clutchless aftermarket piece and already has a 2" spacer. The plots confirm what the coefficients already reveal: Effects of the blade pitch angle, distance, and blade-tip clearance are, respectively, nonlinear, linear, and negligible. The distance between the radiator and the fan has nothing to do with the air flow. "Anyone who has never made a mistake has never tried anything new." Radiator core. I know what you are getting at, like putting a portable fan up against the wall and no air will flow. Just needs to fit the shroud. My car is a 1930 coupe, my radiator fan was replaced by previous owner.
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