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#1
March 13th 2011, 14:06
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I think you forgot the ultimate reason: ring sealing. Because they are a stronger design, they stay round better, so ring sealing will be better over time and especially on slight overheating occasions.
All aspects had been mentioned why they are stronger, but not what 'stronger' means to operation  A disadvantage (besides cost due to maching) could be that since they are thicker in some places, the cylinder tends to run hotter. In how far the slightly larger fins help there is difficult to determine. 
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#3
March 13th 2011, 15:21
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Thanks gents. Sounds very interesting.
Been lurking around GL for many years and i'm using your impressive work to help motivate me to finish my stalled GL project. I have a totally restored and painted shell (4 genuine qtrs, 2x doors, etc, etc) in my garage along with a solid but unpainted pan. Oh and a 901 box  Just need to find the time to assemble.
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#4
March 14th 2011, 02:19
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Git 'er done Bruce! I know exactly what you mean, this project has taken far too long. I'm hoping to get it on the road this year.
@ Wally: you're absolutely right about the sealing.As far as the temperatures are concerned we will have to see. I don't think they will be any hotter than stock cylinders though and the 911 fan should keep the temps down also.
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#5
March 29th 2011, 13:21
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Hi The reason that deutz cylinders are so good is because they are made from ductile iron. this is a form of cast iron that is also maleable. I once dropped a cylinder and it bent. Being in a hurry I hammered the dent out and re honed it. it was perfect. this translates into the ability to hold boost better
Armand
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