[Flieger]

Originally Posted by GH85Carrera

I am oh so very lucky. A good friend has all the machine tools right in his main barn. He was between projects so he just got right on my engine. He has built over 1,000 911 engines so he is not a beginer like me. The tough part is keeping him from going overboard.

He let me drive his 78 911 which is a 3.0 liter engine. It pulls as hard as a 3.2. Since it was his car I did not push too hard. We swapped seats and he took off. After he was rolling he stood on it and I watched in horror as he when right past the redline and ran it up to 7,800 RPM.

He did it several times. He said it is no problem with the right internals. That engine has 30,000 miles on it and he does that all the time.

I am sure I don't want to spend that much but "while I am in there" there area few tricks we can do for no real extra cost. Nothing goes out to be done. He does it all right there.

The redlines on the early motors (7300) are based on valve springs. If you get modern, stiffer springs you can prevent valve float up to 8000 rpm and beyond. If you look at the mean piston speed of the early engines they are quite moderate even at redline.

Redline on later motors I think is based on the CIS capabilities.