cooling

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Re: cooling

Postby Adam » Thu Oct 27, 2011 4:07 pm

Caligula is correct. However, OEM pumps are less reliable; pumps with plastic impellers break and pieces of plastic flow through the system and metal impeller pumps will seize over time. The Stewart pump corrects these problems. BMW's standard parts warranty is 2 years.
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Re: cooling

Postby JFM325is » Thu Oct 27, 2011 6:52 pm

Well I think the question that Cali is bringing up is, is the 30% more flow really worth the extra 150$? Is there anything else about the Stewart pump that would be better then say the regular metal impeller?
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Re: cooling

Postby Adam » Fri Oct 28, 2011 9:50 am

JFM325is wrote:Well I think the question that Cali is bringing up is, is the 30% more flow really worth the extra 150$? Is there anything else about the Stewart pump that would be better then say the regular metal impeller?


That's what I just addressed. The improved flow isn't necessary, but the pump is more reliable. A BMW pump with a metal impeller is a fine product, but over time the bearings will seize. The Stewart pump will likely last longer. However, a BMW pump is still a quality product and should work fine for years.
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Re: cooling

Postby JFM325is » Fri Oct 28, 2011 9:12 pm

The pump I posted also has lifetime warrenty so if they do seize then I can get a new pump. Grrraaahhh this is confussing now. I guess I need to step back and look at what I want to do to this car then decide.
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Re: cooling

Postby Caligula » Fri Oct 28, 2011 9:42 pm

Just to be clear, im not talking about the original plastic, or OEM replacement metal impeller. Im referring to the BMW brand grey composite pump. It goes for around $75 as opposed to $50 or so for the metal impeller from Graf or Geba.
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Re: cooling

Postby JFM325is » Sat Oct 29, 2011 4:04 am

What do think about the pump that I posted Cali?
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Re: cooling

Postby Caligula » Sat Oct 29, 2011 4:46 am

The ad says a metal impeller, but in the pic they have the BMW composite pump. My only issue is that there are two metal impeller pumps, one by Graf, one by Geba. For the life of me i cant remember which one is which, but one has a thin stamped metal impeller, and the other has a heavy cast impeller. You want the one with the thin impeller, ive seen it time and time again that the bearings will go out on the heavier cast pump after 2-3 years of use.
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Re: cooling

Postby JFM325is » Sat Oct 29, 2011 7:43 pm

I looked up the part number that was given on the site and turner motorsports said it was the composite pump, here's the part number #11517527910 and here's the link to turner confirming http://www.turnermotorsport.com/p-1030- ... l-bmw.aspx
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Re: cooling

Postby JFM325is » Sun Oct 30, 2011 4:53 am

Also if I get mishimoto radiator it will take away my expansion tank. Would it be smart to add this item as well to my cooling overhaul list?

http://www.AndysAutoSport.com/bmw/1992_ ... 11640.html
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Re: cooling

Postby Caligula » Sun Oct 30, 2011 4:18 pm

You still use your normal expansion tank.
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Re: cooling

Postby JFM325is » Sun Oct 30, 2011 8:31 pm

Cool
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Re: cooling

Postby Adam » Mon Oct 31, 2011 7:11 pm

My regret is that I installed a Zionsville Autosport Fat Boy, increasing cooling capacity, and the Stewart pump, increasing flow. I live in Maryland and in the winter it takes a while for the car to warm up. That may not be a problem for you guys in SoCal, but it's something to think about.

JFM325is, I have a used water pump that was in my car for 11 months when I took it out and installed the Stewart. I got carried away with cooling parts and bought the Stewart when I really didn't need it. Let me know if you want to buy a used pump.
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Re: cooling

Postby JFM325is » Tue Nov 01, 2011 12:41 am

Thanks Adam but I already decided to go ahead and buy the kit that I originally posted. I'll write a review and let you guys know what's up once I get it and install it
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Re: cooling

Postby wilholl » Fri Dec 23, 2011 10:20 pm

Caligula wrote:The ad says a metal impeller, but in the pic they have the BMW composite pump. My only issue is that there are two metal impeller pumps, one by Graf, one by Geba. For the life of me i cant remember which one is which, but one has a thin stamped metal impeller, and the other has a heavy cast impeller. You want the one with the thin impeller, ive seen it time and time again that the bearings will go out on the heavier cast pump after 2-3 years of use.


or fail in about 10 months (catastrophic failure) fan blades flying everywhere, little rollers from the bearing flying everywhere, belts twisted and tore up. Luckily, somehow, the aluminum radiator survived!
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