Cobra "R" water pump
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Joined: Dec 2000
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From: EL Sobrante, CA ,
Cobra R water pump
They have a closed empeller witch helps them move more coolant, but there not recomended for towing, a stock water pump has an open empeller.
not a good explanation but its the best I can give, I have one on my Lightning and it works great.
not a good explanation but its the best I can give, I have one on my Lightning and it works great.
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Joined: Mar 2003
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My understanding is that since they are more efficient, they can be underdriven and still give the same coolant flow, thereby taking less horsepower.
Bought my pump and pulley, from MAD at www.madenterprise.com/f150.htm great prices, the best service.
Bought my pump and pulley, from MAD at www.madenterprise.com/f150.htm great prices, the best service.
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Joined: Jul 2001
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From: Ft Lauderdale, FL, USA!
I heard on the "other" HD site that the cobra pump robs HP. A couple people did a dyno test without and with pump and conclusion was it waste a waste of money. Just second-hand info...so you might want to research a bit more.
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Joined: Mar 2003
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No argument with that conclusion UNLESS the pump is underdriven, to take advantage of the higher efficiency.
Remember, power consumption on a centrifugal pump varies as the square of the speed. Therefore, if one reduces the speed by 20%, the load requirement decreases by approximately 40%.
Remember, power consumption on a centrifugal pump varies as the square of the speed. Therefore, if one reduces the speed by 20%, the load requirement decreases by approximately 40%.
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Joined: Mar 2003
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OK.
Based on information I have gleaned from other posts on this subject, the Cobra pump puts out a substantially greater coolant flow than a stock pump but in doing so it consumes additional HP.
However, by slowing it down with an underdrive pulley we can apparently reduce the power consumption to less than that required by the stock pump and still maintain better coolant flow.
Most underdrive pulley setups use a smaller drive pulley to achieve the end result. On the Modular Motor this is a NO NO because that would require a smaller diameter Harmonic Damper since our belts run on the Damper OD. Ford probably spent over a million bucks developing the damper for these engines.
SO, the only way we can do it is by going to a larger diameter pulley on the pump.
Based on information I have gleaned from other posts on this subject, the Cobra pump puts out a substantially greater coolant flow than a stock pump but in doing so it consumes additional HP.
However, by slowing it down with an underdrive pulley we can apparently reduce the power consumption to less than that required by the stock pump and still maintain better coolant flow.
Most underdrive pulley setups use a smaller drive pulley to achieve the end result. On the Modular Motor this is a NO NO because that would require a smaller diameter Harmonic Damper since our belts run on the Damper OD. Ford probably spent over a million bucks developing the damper for these engines.
SO, the only way we can do it is by going to a larger diameter pulley on the pump.
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Joined: Mar 2003
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Our SOHC and DOHC 4.6 and 5.4 V8's and the V10 and one of the V6's are called "Modular" by FoMoCo.
This is due to the interchangeability of parts such as rods, pistons, valves, etc., everything except those parts that change when the engine has more cylinders, i.e., block, heads, crank and cams.
This is due to the interchangeability of parts such as rods, pistons, valves, etc., everything except those parts that change when the engine has more cylinders, i.e., block, heads, crank and cams.
