Figure 6. 1/2" should be max distance from radiator for proper cooling if you don't have a shroud. Based on A key component of an engine’s cooling system is the cooling fan, which circulates air through the radiator to dissipate excess engine heat. Visual display of the data from the Distribution Fitting Tool in the Statistics and Machine Learning Toolbox. Einstein, "I have not failed. The quadratic model shows that the optimal pitch angle is around 27.5 degrees, corresponding to a maximum airflow of 882 ft3 per minute. For a better experience, please enable JavaScript in your browser before proceeding. Table 2 shows that the airflow varies significantly for the different factor combinations. 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. Hey guys. Besides getting a shroud, what would be the best way to close this distance? ; the core of the radiator is approximately 371 sq Thanks, good info guys, I think its just over an inch now, will have to check again, .......man you learn something everyday, esp. The quadratic model applied to our factors has the following form: AF = B0 + B1X1 + B2X2 + B3X3 + B4X1X2 + B5X1X3 + B6X2X3 + B7X12 + B8X22 + B9X32, For example, on a '32 Ford, the area of a 15.50" fan is about 189 sq. Accelerating the pace of engineering and science. Just needs to fit the shroud. We fit a quadratic model to estimate the linear, interaction, and quadratic effects of each factor. Our task is to determine if the current cooling fan design can be modified to deliver the required airflow without increasing the power consumption of the electric drive motor (120W) or modifying the surrounding interfaces. 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. Our model predicts that we should have no difficulty meeting our design objective if our assumptions about manufacturing variability are correct. It ain't even got a 4 barrel on it.". "Anyone who has never made a mistake has never tried anything new." It is not a matter of how close the fan is to the radiator. I had the same setup without the shroud before, and ran hot all the time, the shroud makes a big difference. This radiator also fits the 1964–1965 Chevelles with a little additional work. I have a stock SBC 350 in a 1931 Model A Sedan. We can automate the process of finding the optimum setting using the Optimization Toolbox. Without normalization, the coefficients of the factors will have to be adjusted for their unit values (e.g. After modeling the effect of the three factors on airflow, we use our model to estimate the variability in the optimized design. We designed an experiment to investigate the effect of three performance factors: fan distance from the radiator, blade-tip clearance, and blade pitch angle. 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. I am not sure I should post here. Moved the radiator mount to passenger and forward, used a butchered F shroud, moved it and the radiator down in the mount. 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. We can look at the relationship between multiple input variables and one output variable by generating a response surface plot. 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. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. We designed an experiment to investigate the effect of three performance factors: fan distance from the radiator, blade-tip clearance, and blade pitch angle. We design an experiment to analyze how distance, blade-tip clearance, and blade pitch affect the cooling fan airflow. Radiator core. Cooling fan mounted behind the radiator and enclosed by a shroud to direct airflow through the radiator (image courtesy of Novak Conversions). Coefficients of the quadratic model show that distance, pitch, and square of pitch most strongly influence cooling fan airflow. Cold Case 64-67 Pontiac GTO Super Duty Aluminum Radiator Shroud Fan Kit AC, AT or MT CCR-GPG38ASK (0) Reviews: Write first review Description: Cold Case 64-67 Pontiac GTO Super Duty Aluminum Radiator AC, AT These COLD-CASE radiators are Tig welded 100% aluminum and absolutely beautiful. Table 1 shows acceptable upper and lower bounds for the factors. Click on image to see enlarged view. We use the regstats function from the Statistics and Machine Learning Toolbox to fit the quadratic model to the data and plot the coefficients to show which factors have the greatest effect on airflow (Figure 3). 4 Rows Aluminum Radiator+Shroud Fan+Relay Fit 1947-1954 Chevy C/K Pickup Truck. approximately stock size, little less width little more height. A garage full, Karen says she is a Nova widow. your location, we recommend that you select: . On Raul, (350, V-belt drive) we used a 7 blade BB fan from an early '80's pickup, IIRC ~18". 3 Row Radiator+Shroud Fan+Relay For 1963 1964 65 66 Chevrolet C10 C20 C30 Truck. in. 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. 396 4row rad with ac is 1 1/8 from the rad to the front of the clutch. Radiator fan. Simulations verify that the new design should produce airflow according to our specifications in more than 99.999% of the fans manufactured. We select a Box-Behnken response surface design to investigate the effects of the factors on airflow. If you ever see under the hood of a 70 Monte Carlo with a SBC; the shroud must be close to 2 foot long. However, interactively estimating an optimal setting in this manner is time consuming and prone to error. Chevrolet SBC/BBC Universal Aluminum Radiator, 31 Inch Wide 4.7 out of 5 stars 52 $149.99 $ 149. Radiator Shroud Fan. 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 … 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. By Stuart Kozola, MathWorks and Dan Doherty, MathWorks. Other factors, such as the blade geometry and fan diameter, can not be changed due to time and space constraints. I think I'd like it to be a little closer, but it is doing the job. Choose a web site to get translated content where available and see local events and 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. The fan should be half in and half out of the fan shroud. 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 small coefficients for the blade-tip clearance terms indicate that this factor has little effect on airflow. Also original bb fan shroud and original 5 blade fan. The fan blades should be 1/2 in, 1/2 Works great. According to the results, our manufacturing process is in statistical control, as indicated by the absence of violations of control limits or nonrandom patterns in the data over time. 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. The constant term (B0) is not shown. Figure 5 shows the mean airflow through the radiator for each pitch angle increment. Figure 3. sites are not optimized for visits from your location. You should also measure the radiator core, which is the finned surface between the two tanks. offers. 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. With a shroud, the fan can be as far away as you want as long as the shroud is sealed to the radiator. The fan is a clutchless aftermarket piece and already has a 2" spacer. Check it out as we show you the the secrets behind fan shroud fabrication by fabricating our own fan shroud for the radiator of our project shop truck - Street Rodder Magazine Test results from the variable pitch test fan. Click on image to see enlarged view. If the radiator is a 69 SBC A/C radiator, it too should be approx. 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. We used our test data to estimate optimum values for each factor, resulting in a design that produced airflows beyond our goal of 875 ft 3 per minute. Table 1. An unshrouded fan is moving air through only the portion of the radiator equal to the surface area of the fan. Car Radiator&Shroud Fan.            X1 = distance from radiator (inches) 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. We normalize the factors over the range [-1, 1] to aid in identification of important factors and interactions. The last measurement you should check is the distance from the face of the fan to the radiator. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Our cooling fan resembles the one shown in Figure 1. Other MathWorks country Hi All, I am looking to get an electric 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. Selected range of design factors for testing. We monitor and evaluate the manufacturing and installation process using statistical process control (SPC) techniques to ensure that our design works in practice. Figure 3 shows how much each factor contributes to the total airflow. Normal distribution fitted to results of the Monte Carlo simulation. 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 We perform the 15 tests in random order, measuring airflow each time. Two main contributors affect performance variability: model uncertainty and manufacturing variability. On my 76 I have a good 4-5 inches between fan and radiator. Hope that helps. 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. The mean airflow for our existing fan is 842 ft3 per minute with a standard deviation of ± 2 ft3 per minute. A six- or seven-blade mechanical fan or a pair of electrical fans are recommended. Save sbc fan spacer to get e-mail alerts and updates on your eBay Feed. There should be at least 1 inch of clearance between the two. 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. 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. Whichever you Click on image to see enlarged view.            X3 = tip clearance between fan blades and shroud (inches). JavaScript is disabled. Engineers and scientists use a variety of approaches to improve or design quality into products. 1964 65 66 chevrolet C10 C20 C30 Truck it should be max distance from the data. The job of noise on our model predicts that we should have no difficulty our... Karen says she is a Nova widow adjust factor settings and estimate the variability in the.! Chevelle/ IMPALA 63-68 the effect of the only original parts that i kept under the hood after the swap the. 75550 in response to Hi, Arden here we use our model to the! 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Of finding the optimum setting using the Optimization Toolbox car is a SBC... Factors, such as the blade geometry and fan diameter, can be..., corresponding to a 350 SBC would be the best way to close this distance the!