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Registered
Join Date: Dec 2002
Location: Long Beach, CA
Posts: 1,263
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Bad to build 2.7 on 4R case?
I have a really nice, low mileage 4R case. I have seen a 2.7 built on a 4R case, and it seemed to work well. However, there is a lot less metal around the no. 1 bearing in the 4R, so I wonder whether it would be strong enough after opening up the cylinder spigots. Opinions?
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02-19-2006, 05:30 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,119
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ask Henry
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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02-19-2006, 07:05 PM
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Registered
Join Date: May 2003
Posts: 3,346
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I had a 2.7 Carrera RS replica engine done with a 4R case. It lasted 10 years and then developed a crack. The crack was due to excessive windage mods inside the case not lack of material at #1 bearing. I also have a friend with a 2.7 on a 4R case with no problems. I'd say for street use it should be fine. If you race or want to use more than 7000 RPM get a 7R.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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02-20-2006, 06:39 PM
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