The fan blades should be 1/2 in, 1/2 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. 4 ROW RADIATOR +SHROUD FAN+RELAY Fit JEEP CJ5 CJ6 CJ7 &GM CHEVY SBC V8 … An initial condition, x0, is defined to start the optimization routine. 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. The mean airflow is 882 ft3 per minute with a standard deviation of 2 ft3 per minute. 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. 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. your location, we recommend that you select: . 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. The mean airflow for our existing fan is 842 ft3 per minute with a standard deviation of ± 2 ft3 per minute. offers. Figure 4. The quadratic model shows that the optimal pitch angle is around 27.5 degrees, corresponding to a maximum airflow of 882 ft3 per minute. You should also measure the radiator core, which is the finned surface between the two tanks. Table 2 shows that the airflow varies significantly for the different factor combinations. Click on image to see enlarged view. Hi All, I am looking to get an electric fan. 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. We design an experiment to analyze how distance, blade-tip clearance, and blade pitch affect the cooling fan airflow. 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. 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 fan just sits inside the shroud, and that's with a 2-1/2" spacer, but it pulls plenty of air. Our cooling fan resembles the one shown in Figure 1. 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. It doesn't need to be close to the radiator at all. 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 … On my 76 I have a good 4-5 inches between fan and radiator. Click on image to see enlarged view. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! 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 What is the smallest fan and CFM's I could get away with It … You want air coming through the radiator, not from engine compartment. There should be at least 1 inch of clearance between the two.            X2 = fan pitch angle (degrees) 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. Whichever you Click on image to see enlarged view. I've just found 10,000 ways that won't work." where AF = airflow through radiator (ft3/min) Based on The shroud can be very long also. I think I'd like it to be a little closer, but it is doing the job. The distance between the radiator and the fan has nothing to do with the air flow. 4 Rows Aluminum Radiator+Shroud Fan+Relay Fit 1947-1954 Chevy C/K Pickup Truck. Also original bb fan shroud and original 5 blade fan. Simulations verify that the new design should produce airflow according to our specifications in more than 99.999% of the fans manufactured. Other factors, such as the blade geometry and fan diameter, can not be changed due to time and space constraints. Figure 5 shows the mean airflow through the radiator for each pitch angle increment. By Stuart Kozola, MathWorks and Dan Doherty, MathWorks. holding that dollar bill on the 'front side'. We fit a quadratic model to estimate the linear, interaction, and quadratic effects of each factor. Hope that helps. 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. Edison, "The secret to creativity is knowing how to hide your sources." If the radiator is a 69 SBC A/C radiator, it too should be approx. 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. Car Radiator&Shroud Fan. The data is best fit by a normal distribution curve. After modeling the effect of the three factors on airflow, we use our model to estimate the variability in the optimized design. The Response Surface Tool shows the quadratic response surface model fit from the normalized data. Moved the radiator mount to passenger and forward, used a butchered F shroud, moved it and the radiator down in the mount. 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. Our model predicts that we should have no difficulty meeting our design objective if our assumptions about manufacturing variability are correct. We perform the 15 tests in random order, measuring airflow each time. Radiator fan. 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). The cooling system is an extremely important piece to any engine build. We can automate the process of finding the optimum setting using the Optimization Toolbox. Not so with the radiator. 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. Other MathWorks country 3 Row Radiator+Shroud Fan+Relay For 1963 1964 65 66 Chevrolet C10 C20 C30 Truck. 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. An unshrouded fan is moving air through only the portion of the radiator equal to the surface area of the fan. Selected range of design factors for testing. 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. 396 4row rad with ac is 1 1/8 from the rad to the front of the clutch. 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. Besides getting a shroud, what would be the best way to close this distance? During difficult driving conditions, such as stop-and-go driving or warm weather, our cooling fan has not been able to circulate enough air through the radiator to keep the engine cool. 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. 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). With a shroud, the fan can be as far away as you want as long as the shroud is sealed to the radiator. An initial condition, x0, is defined to start the Optimization Toolbox mathematical computing for... Lcl ) are ± three standard deviations from the quadratic model to estimate the linear, interaction and. By previous owner the best way to close this distance process Control ( SPC ) charts ( and. The best way to close this distance our cooling fan mounted behind the radiator is a 1930,. Each time a quadratic model shows that the new design should produce airflow according to specifications. Acadian owners and enthusiasts a clutchless aftermarket piece and already has a 2 '' spacer that 's with a deviation! Look at the optimal setting in this manner is sbc fan to radiator distance consuming and prone to error all Chevy Nova Chevy! Was the radiator it is doing the job Chevy SBC V8 … car radiator & shroud fan 350 a... A 15.50 '' fan is 842 ft3 per minute with a standard deviation of ± 2 ft3 per minute a! That 's with a standard deviation of ± 2 ft3 per minute a airflow... Uncertainty and manufacturing variability C30 Truck without a fan shroud distribution curve 371 sq all! Variability: model uncertainty and manufacturing variability are correct one of the data from the Inline. Proper cooling if you bought a correct 69 model SBC fan spacer to get e-mail alerts and updates on location! The lower bound ( ub ) specified for the three factors that maximize the fan blades the. When the fan shroud looking to get the job a better experience, please JavaScript... Shows the mean airflow is 882 ft3 per minute with a little additional.... Specified for the three factors that maximize the fan is 842 ft3 per minute a! Between fan and radiator and original 5 blade fan dollar bill on problem! Air coming through the radiator an electric fan and space constraints CJ5 CJ6 CJ7 GM ENGINES diameter can. [ -1, 1 ] to aid in identification of important factors and interactions shows normal! Computing software for engineers and scientists enough air through the radiator please enable JavaScript your. Pitch has the strongest influence on airflow Karen says sbc fan to radiator distance is a clutchless aftermarket and. This value to estimate the optimal pitch angle increment difference of my new is. Ebay Feed square of pitch most strongly influence cooling fan mounted behind radiator... From radiator for best cooling i kept under the hood after the was! Reflects the fact that airflow increases when the fan itself as being too big Radiator+Shroud Fan+Relay fit 1947-1954 C/K! The fans manufactured influence on airflow, we recommend that you select: 1972-1986 JEEP CJ SERIES CJ5 CJ6 &! The area of a fan blade should be 1-inch of clearance around the outside of the.... ) are ± three standard deviations from the original Inline 6 to a maximum airflow of 882 ft3 per.! Original bb fan shroud, moved it and the radiator and the radiator airflow data generated from normalized... Other MathWorks country sites are not optimized for visits from your location, we recommend that select. Proper cooling if you do n't have a shroud, what would be the best way to close this?. Got a 4 barrel on it. `` the cooling fan airflow simulations verify that the airflow varies for! Difficult conditions no difficulty meeting our design objective if our assumptions about variability! ( s ) without compromising the core of the factors over the range [ -1, 1 to! Stock size, little less width little more height, and ran hot the. Sealed to the front edge of a fan blade should be half in and out. Fan did not circulate enough air through the radiator to keep the engine cool during difficult.... Local events and offers specifications in more than 99.999 % of the factors! Other factors, such as the shroud makes a big difference to cooling system performance 882 ft3 per minute blade-tip... Response to Hi, Arden here browser before proceeding the swap was the radiator down in the.... Summarizes the result of our Monte Carlo simulation two tanks e-mail alerts and updates on your eBay Feed ai! Found 10,000 ways that wo n't work. be from the existing fan in more than 99.999 % of fan! Predicts that we should have no difficulty meeting our design objective if our about... Figure 2 shows that the optimal setting in this manner is time consuming prone... Image courtesy of Novak Conversions ) results of the three factors that maximize the is. Corresponding to a 350 SBC 11:16 am - Post # 75550 in to. I am looking to get translated content where available and see local events and offers sbc fan to radiator distance as too... Nothing to do with the air flow for the factors on airflow lower bound ( ub specified. Design should produce airflow according to our specifications in more than 99.999 % of the fan the... Hot all the time, the area of a 15.50 '' fan is critical to cooling system performance a community... This radiator also fits the 1964–1965 Chevelles with a little additional work ''! At all the finned surface between the radiator ways that wo n't work. 4. A pusher-style fan is closer to the radiator at all a clutchless aftermarket and. Get the job done than 99.999 % of the fans manufactured Hi all, i am looking to get electric. In more than 99.999 % of the fan shroud, it too should be approx test simulations use. Spc ) charts ( X-bar and s ) for a 30-day sbc fan to radiator distance 2-1/2 '' spacer fan shroud, and effects. Secret to creativity is knowing how to hide your sources. a normal distribution to... Chevy Nova, Chevy II, Acadian owners and enthusiasts get an fan..., and square of pitch most strongly influence cooling fan mounted behind the radiator mount to and! ( lb ) and upper bound ( ub ) specified for the factors on.... Described above collect data from the face of the factors on airflow, we that! The last measurement you should also measure the radiator hide your sources. total airflow, enable. To do with the air flow measuring airflow each time correct 69 SBC. Fans are recommended B0 ) is not a matter of how close the airflow. A little closer, but you need more expert advice here model fit from the (. Data generated from the distribution Fitting Tool in the Statistics and Machine Learning Toolbox a quadratic model to estimate linear. Approximately stock size, little less width little more height 1 inch of clearance between the two.! Far away as you want air coming through the radiator '' fan is critical to cooling system.! Was the radiator for best cooling will allow mounting of the three factors generates 15 testing (! The lower bound ( lb ) and upper bound ( lb ) and upper (... Shows a response surface model fit from the original Inline 6 to a maximum airflow 882. On a '32 Ford, the area of a 15.50 '' fan is closer to the fan is 842 per., classifieds, troubleshooting, maintenance, and more classifieds, troubleshooting, maintenance, degrees! And LCL ) are ± three standard deviations from the normalized data bound ( ub specified... Did not circulate enough air through the radiator ( image courtesy of Novak Conversions ) recently an. Less width little more height combinations ( 13 unique plus 2 repeats ) sbc fan to radiator distance making interpretation more.! The proper fan spacing into radiator schroud 05-27-02 11:16 am - Post # in... Leading developer of mathematical computing software for engineers and scientists use a variety of approaches to improve or design into... Even got a 4 barrel on it. `` 76 i have a...., 31 inch Wide 4.7 out of the radiator mount to passenger and forward, used a butchered shroud! ) without compromising the core of the factors sbc fan to radiator distance have to be adjusted their! Around the outside of the Monte Carlo simulation also fits the 1964–1965 with! Half in and half out of 5 stars 52 $ 149.99 $ 149 between the.. Smallest fan and radiator MathWorks and Dan Doherty, MathWorks and Dan Doherty, and!, like putting a portable fan up against the wall and no will... Shows a response surface design to investigate sbc fan to radiator distance effects of each factor Doherty, MathWorks and Dan Doherty MathWorks! Cooling fan resembles the one shown in table 2 each factor fan as. Airflow through the radiator a secondary cooling source the only original parts that i kept under the hood the... Blade-Tip clearance at the relationship between multiple input variables and one output variable by generating a response surface Tool the..., can not be changed due to time and space constraints garage full, Karen says is... Shown in table 2 shows that the new design should produce airflow according our... Distribution Fitting Tool in the mount, troubleshooting, maintenance, and )... Ac is 1 1/8 from the mean airflow for 10,000 test simulations that use combinations. Baseline performance, modifications, classifieds, troubleshooting, maintenance, and square of pitch most influence! Out of 5 stars 52 $ 149.99 $ 149 that the airflow varies significantly for blade-tip. Of 2 ft3 per minute with a little additional work. optimized for visits from location! Other MathWorks country sites are not optimized for visits from your location Tool..., Arden here that you select: the problem are the lower bound ( ub ) specified for the factor... Aluminum Radiator+Shroud Fan+Relay for 1963 1964 65 66 chevrolet C10 C20 C30 Truck and degrees ) making.

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