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Registered
Join Date: Sep 2005
Location: So. Cal.
Posts: 11,243
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Conv. of 72 2.4 to 2.2 p/c's
I have just purchased a 72 911 T Targa. The engine was gone through top to bottom 3000 miles ago and the p/c's were changed to 2.2's. Can you tell me why? I understand this is a common change, but I don't know why.
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09-21-2005, 08:10 PM
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Registered
Join Date: Jan 2003
Location: Dublin, CA
Posts: 6,269
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Increases compression.
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Sergio The GT Lid Whisperer PCA 42yrs / Ex-RGruppe #197 '19 718 Cayman S (9th Porsche/1st with PDK) '14 Subaru Forester XT (Porsche support vehicle) |
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09-21-2005, 08:18 PM
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Registered
Join Date: Sep 2005
Location: So. Cal.
Posts: 11,243
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2.4 to 2.2
Do you know what this typically does to horsepower? IT's a 72 T w/ MFI.
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09-22-2005, 06:23 AM
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Stressed Member
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It depends on whhich 2.2 pistons were installed. They could be T or E. Assuming E, a guess would be 5 HP. S would result in a compression ratio too high for pump gas and single plug ignition. Hopefully, the engine builder set the compression ratio at about 9.8:1. this would be done by piston choice and deck height adjustment. High compression is more significant for torque production than HP.
-Scott
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'70 911E short stroke 2.5 MFI. Sold  '56 Cliff May Prefab |
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09-22-2005, 06:52 AM
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1970 Porsche 911E
