911 motor topic, Fan housing/shroud |
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911 motor topic, Fan housing/shroud |
worn |
Jan 3 2017, 03:06 PM
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#21
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can't remember Group: Members Posts: 3,157 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
OK, my tag line says the 911 is out of action and that must change. I have torn apart and rebuit the whole engine but the fan shroud is cracked, seeing as how it is magnesium. I bought a nice used one and it has the same casting number as the old one. But it is different.
In both the support vanes go to a mounting flange for the alternator. The hole the alternator goes into is the same diameter. The difference is the hole that the alternator fits into is deeper in my cracked original and shallower in the new one. PET says there was a change at the 80 year and I have an '80 SC. With the shallower hole the alternator goes in less and the studs for fastening just barely fit through. No room for a nut. Also, I think the fan would be rather out in the shroud. What I am trying to find out is how to get an alternator to fit the thick flange newly purchased shroud. One question is which is newer and which is older. Here is a photo of what Vertex sells (but doesn't make) You can get spacer rings for alternators that normally go with a shroud with a hole that is shallower. Help?! |
mb911 |
Jan 4 2017, 02:44 PM
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#22
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914 Guru Group: Members Posts: 6,872 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
I am actually knee deep into looking at recasting these in magnesium as replacement s..
Worn you got your answer there and if need be I can have a spacer made for you.. Just let me know. |
worn |
Jan 4 2017, 04:26 PM
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#23
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can't remember Group: Members Posts: 3,157 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
I am actually knee deep into looking at recasting these in magnesium as replacement s.. Worn you got your answer there and if need be I can have a spacer made for you.. Just let me know. This is what I did new year's eve. My son wanted a new manifold for a Lotus 907 engine he is megasquirting using 4 motorcycle injector bodies. Round at the injector to oval ports. That took making cores. This and the other pour both worked. Making the molds to sand cast the later die cast alternator housings would be a bit harder. Doug decided to make individual runners and weld the castings together to the flange he just cast. There are 914 pistons in the mix and a bit of Audi... |
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