Main Menu

1990 964 3.8 conversion

Engine

Vehicle Information: Model: C2; Year: 1990; Body Type: Coupe; Total Mileage: 80,000;

I am doing a 3.8 conversion on a 1990 C2 and have a few questions. First, I replaced the rod bearings, bolts and nuts and read the workshop manual on the tightening procedure. it indicates an initial torque of 11 ft lbs and then a "2x90 degree" tightening, I assume to stretch the rod bolts. I followed this, and it seems like an awful lot of muscle on the bolts. I have rebuilt many, many engines and am used to the 37.5 ft lbs on the older engines when using factory bolts. Am I understanding this correctly that after the 11 ft lbs on both nuts, one nut is turned 90 deg once, then the other the same, then go back and turn each nut another 90 degrees, for a total of 180? I, of course, replaced the bolts and nuts, and used the 993 nuts. I want to make sure this is correct before I finish it up.Secondly, I am selecting new cams and Web Cam recommended the 993 sport grind. This car has B&B headers and muffler, a chip, K&N, Andial's intermmediate weight flyhwheel and now the Mahle sport 102mm cylinders. It is mostly a street car, doing occasional DE's. Do you have any other grinds you recommend. I heard the Gruppe B cam is for turbos, not this configuration. Thanks for your help.

You must log in to view answers associated with technical questions. Join PCA to participate in our community.
No votes yet