oem vs gm performance water pump?
10-17-2012, 08:02 AM
#23
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Finally got around to taking a look at fan / pulley clearance on my car. With the Alradco radiator, stock water pump, and stock fans, I have about 3/4" clearance from the pulley to the fan shroud. And the thermostat housing is even closer - maybe 1/8-1/4".
10-18-2012, 08:09 PM
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If this wasn't a $750 piece of jewlery I would love to give it a try, even allows you to retain the original belt configuration with a pulley that looks like it would fit for us aluminum radiator guys.
http://www.texas-speed.com/p-24-mezi...mp-55-gpm.aspx
http://www.texas-speed.com/p-24-mezi...mp-55-gpm.aspx
10-18-2012, 08:43 PM
#26
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If this wasn't a $750 piece of jewlery I would love to give it a try, even allows you to retain the original belt configuration with a pulley that looks like it would fit for us aluminum radiator guys.
http://www.texas-speed.com/p-24-mezi...mp-55-gpm.aspx
http://www.texas-speed.com/p-24-mezi...mp-55-gpm.aspx
12-04-2012, 08:27 AM
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Had to pull things apart to replace the alternator, and since I had to drain the coolant already I pulled the water pump to look at this again.
With the Alradco radiator, there's ~5.25" from the block (the spots where the water pump mounts) to the radiator fan shroud. The stock pump is basically that same height (as you can see in the attached pic), but because the pulley is set back from the end of the pump shaft, it clears the fan shroud by ~0.5".
I got in touch with Evans Cooling Systems, as they make high flow LS pumps. It looks like their online catalog hasn't been updated since 2010, at which point they were only making an LS1 style pump (with the big, bullet nose pulley) - EP30913. However, since then they've added a shortened pump (since the Vettes and new F-bodies use a shorter, CTS-V style pump), the EP30913-S, which is in their LS1/LS6 brochure. David Wright, a Technical Sales Manager, sent me the two pics below. He didn't have a picture to show me, but he said the stock LS2-style pump (our pump) is about another inch shorter than the EP30913-S. In other words, for those of us with a fat radiator, even the "short" pump isn't short enough. I just shot him a reply email asking if there's anything they can do for us, so we'll see what he has to say.
Stock CTS-V pump (AFAIK, same for LS6 and LS2):
Evans Cooling pumps (EP30913-S on left, stock LS1 in middle, EP30913 on right):
Height difference between "short" and "normal" Evans pumps:
With the Alradco radiator, there's ~5.25" from the block (the spots where the water pump mounts) to the radiator fan shroud. The stock pump is basically that same height (as you can see in the attached pic), but because the pulley is set back from the end of the pump shaft, it clears the fan shroud by ~0.5".
I got in touch with Evans Cooling Systems, as they make high flow LS pumps. It looks like their online catalog hasn't been updated since 2010, at which point they were only making an LS1 style pump (with the big, bullet nose pulley) - EP30913. However, since then they've added a shortened pump (since the Vettes and new F-bodies use a shorter, CTS-V style pump), the EP30913-S, which is in their LS1/LS6 brochure. David Wright, a Technical Sales Manager, sent me the two pics below. He didn't have a picture to show me, but he said the stock LS2-style pump (our pump) is about another inch shorter than the EP30913-S. In other words, for those of us with a fat radiator, even the "short" pump isn't short enough. I just shot him a reply email asking if there's anything they can do for us, so we'll see what he has to say.
Stock CTS-V pump (AFAIK, same for LS6 and LS2):
Evans Cooling pumps (EP30913-S on left, stock LS1 in middle, EP30913 on right):
Height difference between "short" and "normal" Evans pumps:
