The silly little question thread ...
#827
Drifting
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They make a bold statement about the aluminum being superior. I would like to know in which way? Other than corrosion and damage due to neglect and mistreatment the aluminum should be no better and as I stated worse due to the added weight. It appears to not be treated or coated so if the fan is mistreated the same as the magnesium version it will be in no better shape in 20 years.
Buy a factory unit take care of it and it will last as long as you continue to take care of it. Also the picture is for the 11 blade earlier 911 or turbo version. Our cars use the 12 curved blade version
Buy a factory unit take care of it and it will last as long as you continue to take care of it. Also the picture is for the 11 blade earlier 911 or turbo version. Our cars use the 12 curved blade version
#828
Rennlist Member
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So long as there are no cracks or extensive corrosion you should be good to go for years to come. Magnesium gets a bad rap but it is a fantastic alloy. I spent the past 6 months helping a local foundry that pours aluminum, elemental copper, brass and bronze to pour aluminum based magnesium alloys. We essentially tried an entirely new sand and process and so far the results are better than expected. I have been considering redesigning and manufacturing valve covers in mag alloy so they should not warp like the factory ones and see how that goes. I might consider other projects as well but honestly for what it takes to cast a mag fan housing it would still be cheaper to buy a factory unit at $327.71 from suncoast than i can manufacture them for. The valve covers at $229.62 each I can easily better that price after a redesign but it will be a while before I get to it.
#829
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I think I got lucky. My mag. valve covers are still in good shape and no leaks. I have a spare set of Aluminum lowers, but don't even really need them.
I may just sand blast and PC my covers and call it done.
I may just sand blast and PC my covers and call it done.
#832
Rennlist Member
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It will be a few months since the holidays are here before I have exact figures but preliminary numbers to manufacture a set is less than the cost of one new cover from Porsche. I would not post anything here without discussing it with IB first. But the possibilities are good that this will happen by the summer. If it works out I might consider attacking some other aluminum parts in magnesium for weight savings if there is interest.
#833
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while cleaning/painting my cooling fan, I noticed two small hairline cracks on the face of my fan....is this safe to use and is it possible to glue/weld together? is there someway to salvage it? thank you
#834
Rennlist Member
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Originally Posted by luckyJ
while cleaning/painting my cooling fan, I noticed two small hairline cracks on the face of my fan....is this safe to use and is it possible to glue/weld together? is there someway to salvage it? thank you
#835
Race Car
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Originally Posted by John McM
I had the same crack. My mechanic said it wasn't in urgent need of replacement but when the bearing needed replacement as well I just bought a new assembly. In my aviation days we drilled the end of cracks to stop them spreading. Not sure it's wise to do the same with magnesium.
Ever seen what happens? It's not pretty, especially if it happens when you are spinning the motor fast...
Just sayin. If there is a crack, you just replace it immediately. It's one of those things...
#836
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I'm about to take the AC bracket off to gain access to the passenger side timing chain cover/gaskets...but this crank pulley bolt is tricky....if I try to turn it CCW, then the crank pulley moves in sync and I read somewhere that this could cause internal damage...
what is the proper procedure to unbolt this please? thank you
what is the proper procedure to unbolt this please? thank you
#837
Race Car
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You have to use a special tool that grips the heads of the cap nuts to loosen that bolt.
The tool is expensive but there are plans for one on rennlist somewhere
The tool is expensive but there are plans for one on rennlist somewhere
#838
Race Car
#839
Rennlist Member
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I'm about to take the AC bracket off to gain access to the passenger side timing chain cover/gaskets...but this crank pulley bolt is tricky....if I try to turn it CCW, then the crank pulley moves in sync and I read somewhere that this could cause internal damage... what is the proper procedure to unbolt this please? thank you
#840
Rennlist Member
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That is a strange place for it to crack and no doubt was the result of some mechanic screwing up at some point.