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Registered
Join Date: Aug 2009
Location: Tennessee
Posts: 115
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2.7 Backdate to 2.4
I have a 71 911E garage-queen, week-end driver with a 74 2.7 7R case engine. No history on the engine. Case studs are pulling from the case. Instead of putting $1k in machine work on line-boring and case savers for the 2.7 case . . .
Could I build a 2.4 engine using a used 2.4 case and heads, new or good used 2.4 pistons/cylinders, and assuming all is OK, reuse the crank, rods, cam towers, cams, etc. of the 2.7 in the new engine? Selling the 2.7 case and heads should be close to a wash on parts costs. No plans to autocross or race. Just want a strong, reliable, long--lasting engine. Is the 2.4 case likely to need line-boring? Thanks for the continued help.
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Tennessee911 |
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12-15-2011, 01:58 PM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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JMHO, but ANY mag case needs the "Full Monty" to be reliable anymore due to age & heat cycles.
Its not cheap, bit there isn't an alternative if you want it to be durable. Line-bore to standard and reface parting lines, case savers, and decking are all mandatory to get a good mag-cased engine so the crank turns freely and doesn't leak.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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12-15-2011, 02:36 PM
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