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in. Figure 3. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. 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 estimate the airflow for 10,000 test simulations that use random combinations of factor settings within the tolerance ranges described above. Click on image to see enlarged view. 3 ROW ALUMINUM RADIATOR & SHROUD FAN FOR 64-67 CHEVY CHEVELLE/ IMPALA 63-68. ; the core of the radiator is approximately 371 sq Not so with the radiator. Independent tests have shown that even with a pusher style fan mounted only 5/8 of an inch away from the face of the radiator, there is still a vast amount of air that escapes from around the skirt between the radiator and the fan blades. It doesn't need to be close to the radiator at all. 4 Rows Aluminum Radiator+Shroud Fan+Relay Fit 1947-1954 Chevy C/K Pickup Truck. One of the only original parts that I kept under the hood after the swap was the Radiator. We design an experiment to analyze how distance, blade-tip clearance, and blade pitch affect the cooling fan airflow. From the mean-square error of our model (an output of the regstats function), we determine that the standard deviation of the model is 0.96 ft3 per minute. Click on image to see enlarged view. However, interactively estimating an optimal setting in this manner is time consuming and prone to error. We use this value to estimate the effect of noise on our model. 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). Table 1. Other factors, such as the blade geometry and fan diameter, can not be changed due to time and space constraints. Edison, "The secret to creativity is knowing how to hide your sources." For a better experience, please enable JavaScript in your browser before proceeding. Figure 5 shows the mean airflow through the radiator for each pitch angle increment. A six- or seven-blade mechanical fan or a pair of electrical fans are recommended. The small coefficients for the blade-tip clearance terms indicate that this factor has little effect on airflow. A garage full, Karen says she is a Nova widow. Click on image to see enlarged view. 1 Simulations verify that the new design should produce airflow according to our specifications in more than 99.999% of the fans manufactured. Table 1 shows acceptable upper and lower bounds for the factors. Visual display of the data from the Distribution Fitting Tool in the Statistics and Machine Learning Toolbox. I've just found 10,000 ways that won't work." A few rules of thumb that we'll pass along from our experience: Don't use an electric fan as the primary fan on 4-core radiators. What is the smallest fan and CFM's I could get away with It … Figure 4. Based on Radiator core. . holding that dollar bill on the 'front side'. We expect the variability for the three design factors to be normally distributed with the following means and standard deviations: To estimate how variability affects our design, we use a Monte Carlo simulation. Save sbc fan spacer to get e-mail alerts and updates on your eBay Feed. The radiator is open to allow air to come through. Re: proper fan spacing into radiator schroud 05-27-02 11:16 AM - Post# 75550 In response to Hi, Arden here. your location, we recommend that you select: . Works great. Hey guys. Figure 6. 396 4row rad with ac is 1 1/8 from the rad to the front of the clutch. The quadratic model shows that the optimal pitch angle is around 27.5 degrees, corresponding to a maximum airflow of 882 ft3 per minute. Because this baseline performance does not meet our requirement of 875 ft3 per minute, we need to determine which design variables can be adjusted to improve the fan performance and achieve our target airflow. We designed an experiment to investigate the effect of three performance factors: fan distance from the radiator, blade-tip clearance, and blade pitch angle. The cooling system is an extremely important piece to any engine build. I will just give 2 Cents worth, but you need more expert advice here. Next, measure the distance between the radiator core and the closest engine component.            X2 = fan pitch angle (degrees) We fit a quadratic model to estimate the linear, interaction, and quadratic effects of each factor. Radiator Shroud Fan. Besides getting a shroud, what would be the best way to close this distance? Pitch is the dominant factor. By Stuart Kozola, MathWorks and Dan Doherty, MathWorks. The fan is a clutchless aftermarket piece and already has a 2" spacer. A key component of an engine’s cooling system is the cooling fan, which circulates air through the radiator to dissipate excess engine heat. Our initial fan did not circulate enough air through the radiator to keep the engine cool during difficult conditions. There should be at least 1 inch of clearance between the two. Now, the power difference of my new engine is extremely evident. The fan should be half in and half out of the fan shroud. The shroud can be very long also. The Monte Carlo simulation predicts that our new fan design will produce airflow greater than the goal of 875 ft3 per minute more than 99.999% of the time. 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. 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. Attach the fan to the small area around the core of the radiator where there is a metal lip that is approximately 1/4" to 3/8". Normal distribution fitted to results of the Monte Carlo simulation. 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. On Raul, (350, V-belt drive) we used a 7 blade BB fan from an early '80's pickup, IIRC ~18". We set the distance and blade-tip clearance at the optimal values. We need to monitor and control the manufacturing and installation process to ensure that our design is achievable and maintainable in the presence of manufacturing and installation uncertainty. 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. The last measurement you should check is the distance from the face of the fan to the radiator. There should be 1-inch of clearance around the outside of the fan blades to the fan shroud. I don't like the idea of dangling the radiator back away from the core support, I'd have to really bend the AT cooler lines and this also takes the radiator further away from the front of the car. The constraints on the problem are the lower bound (lb) and upper bound (ub) specified for the three factors. We normalize the factors over the range [-1, 1] to aid in identification of important factors and interactions. The fan just sits inside the shroud, and that's with a 2-1/2" spacer, but it pulls plenty of air. Hope that helps. where AF = airflow through radiator (ft3/min) 1972-1986 JEEP CJ SERIES CJ5 CJ6 CJ7 GM ENGINES. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. MathWorks is the leading developer of mathematical computing software for engineers and scientists. If the radiator is a 69 SBC A/C radiator, it too should be approx. 21 inches between the tanks. Einstein, "I have not failed. Figure 2. It is not a matter of how close the fan is to the radiator. In most cases the mechanical fan is mounted to the water pump snout and is driven off of the same pulley that rotates the water pump. Click on image to see enlarged view. The negative coefficient for distance reflects the fact that airflow increases when the fan is closer to the radiator. sites are not optimized for visits from your location. Our model predicts that we should have no difficulty meeting our design objective if our assumptions about manufacturing variability are correct.            X3 = tip clearance between fan blades and shroud (inches). I had the same setup without the shroud before, and ran hot all the time, the shroud makes a big difference.            X1 = distance from radiator (inches) If the fan is too close to the radiator, that will reduce the effectiveness of the fan … With a shroud, the fan can be as far away as you want as long as the shroud is sealed to the radiator. This article follows one of the popular frameworks of Design for Six Sigma practitioners—DMAIC, for define, measure, analyze, improve, and control—to demonstrate how MATLAB, the Statistics and Machine Learning Toolbox, and the Optimization Toolbox can improve the performance of an automotive engine cooling fan. The mean airflow is 882 ft3 per minute with a standard deviation of 2 ft3 per minute. This radiator also fits the 1964–1965 Chevelles with a little additional work. approximately stock size, little less width little more height. I recently did an engine swap in my 73 Nova from the original Inline 6 to a 350 SBC. Anybody know how far the front edge of a fan blade should be from the radiator for best cooling? I am not sure I should post here. A pusher-style fan is best as a secondary cooling source. Without normalization, the coefficients of the factors will have to be adjusted for their unit values (e.g. 21 inches horizontal on the radiator side. Selected range of design factors for testing. If all that is correct, then we'd have to look at the fan itself as being too big. Test results from the variable pitch test fan. Figure 7 shows the first 30 days of production data for our new cooling fan, produced at a rate of five cooling fans per day. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! JavaScript is disabled. 4 ROW RADIATOR +SHROUD FAN+RELAY Fit JEEP CJ5 CJ6 CJ7 &GM CHEVY SBC V8 … ft3 per minute, inches, and degrees), making interpretation more difficult. 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. Choose a web site to get translated content where available and see local events and We can look at the relationship between multiple input variables and one output variable by generating a response surface plot. I have a stock SBC 350 in a 1931 Model A Sedan. 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. Radiator fan. An unshrouded fan is moving air through only the portion of the radiator equal to the surface area of the fan. It wobbles back and forth when i 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. 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. The constant term (B0) is not shown. Other MathWorks country Upper and lower control limits (UCL and LCL) are ± three standard deviations from the mean. "My car ain't no hot rod. It ain't even got a 4 barrel on it.". 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. 25790869 Electronic Radiator Fan Clutch - with Harness,Fits Chevy Trailblazer 2002-2009,GMC Envoy,Ascender,EXT,Bravada,Buick Rainier, 622-001, 15-40133, 15293048 Engine Fan … 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. 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. Also original bb fan shroud and original 5 blade fan. For owners of 1968–1972 Chevelles, the Flex-a-lite 58295 radiator and fan combination fits nicely, and it comes with a dual electric fan setup that moves The Statistics and Machine Learning Toolbox includes the Response Surface Tool (rstool), which lets you interactively generate response surface plots from your data. 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. 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. Actually..yes it will make a difference. Our cooling fan resembles the one shown in Figure 1. 3. Figure 4 shows a response surface plot of our airflow data generated from the quadratic model. My car is a 1930 coupe, my radiator fan was replaced by previous owner. This is easiest to do if you remove the belt-driven fan and fan shroud so that you can accurately measure the radiator and the distance between the radiator and engine components. To measure baseline performance, we collect data from the existing fan. 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. Hi All, I am looking to get an electric fan. I think I'd like it to be a little closer, but it is doing the job. Clearly, pitch has the strongest influence on airflow. We can automate the process of finding the optimum setting using the Optimization Toolbox. 1/2" should be max distance from radiator for proper cooling if you don't have a shroud. 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. 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To the radiator and enclosed by a shroud, it should be at least 1 inch of clearance between two! You want as long as the shroud makes a big difference the Statistics and Machine Learning.... Air will flow of electrical fans are recommended 73 Nova from the normalized data the smallest fan and CFM i! Know how far the front edge of a fan shroud and CFM 's i could get away with …! Automate the process of finding the optimum setting using the Optimization Toolbox how distance, blade-tip terms! Contributes to the data optimal values, maintenance, and blade pitch affect the fan! Least 1 inch of clearance between the two affect the cooling fan airflow not circulate enough air the. Original 5 blade fan classifieds, troubleshooting, maintenance, and quadratic effects of the.... Series CJ5 CJ6 CJ7 GM ENGINES it 's not going to get translated content available...

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