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Location: Fort Myers, FL
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2.7 Engine - aluminum vs magnesium case? What would you get?
I am going to get a new 2.7 engine for my 1972T. I am looking at two different engines, one that is an aluminum case (from the mid '60's) and a standard 2.7 mag case.
From purely the case perspective (all things being equal), and both built by knowledgeable rebuilders (case savers, ect.) Which case would you choose, and why? Thanks.
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1972 911t Sportomatic <----- bet your jealous |
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12-13-2007, 01:18 PM
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Go with the aluminum case if you can. Magnesium isn't as strong.
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12-13-2007, 01:19 PM
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Magnesium is a LOT lighter and the 7R big spigot version is very strong. If the case issues are addressed, it's a better "Fit" for your '72T which originally came with a magnesium case (a 4R or 5R). Only the very knowledgable would be able to tell that it's not original and they'd have to get under the car to do it. . . vs. AL which is immediately obvious.
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12-13-2007, 02:10 PM
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Depends, IMO, how fast you spin the motor. Anything 8K and over is pretty destructive to magnesiuam cases, especially on 70.4mm cranks. My guess is you are looking for an RS spec motor, so I'd go mag, as long as it is a 7R. They are light and look correct. If doing something exotic, like a 2.6SS, I'd absolutely go Ally.
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12-13-2007, 02:43 PM
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Quote:
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12-14-2007, 05:17 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
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Quote:
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12-14-2007, 05:29 AM
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Well, the 2.6SS has the same spigot as the 2.7RS ...
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12-14-2007, 06:01 AM
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3 restos WIP = psycho
Join Date: Feb 2005
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Quote:
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12-14-2007, 06:13 AM
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Hello there.
I'd ask the temeprature you expect to see. Mag is strong, and excellent below 180 degrees, when it suddenly softens. Cool ambients, cool oil, cool everything, and mag is great. Kind regards David |
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12-14-2007, 06:40 AM
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Quote:
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12-14-2007, 08:14 AM
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