Gentlemen,
I’m writing this thread to solicit advice on upgrading my 911T 2.2 engine.
I am starting to purchase the parts and materials for my engine rebuild and need advice on what route to take regarding my displacement increase method.
My goal is more power and a reliability/longetivity. I’m not looking to build a monster, but would like something that performs like an “E” or better and am willing to perform modifications that will result in a bulletproof engine (or as close as you can with a 50 year old magnesium case!!!)
I would like to either increase my displacement to 2.5 liters by performing the modification recommended in the BA book, by installing 90mm RS P&C’s and performing the necessary case modifications, or to 2.4 liters via a set of 87.5mm Nickies with 9.5:1 JE pistons.
I want to keep my “T” crankshaft and 66mm stroke.
Will the 87.5mm Nickies fit in the small spigots without machining? If so, would this be my best course of action as far as keeping stresses down on a 50 year old case? Or is it ok to do the 2.5 upgrade with the case modifications and expect longetivity after machining the spigots to 97mm?
If I go the 2.5 route, would you choose to stick with the “T” Camshafts or regrind to “E” or Solex? I am planning to send the Camshafts and Rockers to Webcam for grinding/polishing/rehardening/rebushing if I upgrade the cam profiles, and WILL upgrade to “E” or Solex if I go with the 2.4 build as well as purchase a set of Pauter rods for the extra insurance with the higher rev limit (keeping the “T” crankshaft because I cannot find a reasonably priced counter weighted crankshaft.)
Any thoughts are greatly appreciated. I have spent months reading and keeping notes on the various options and realize there is a lot of information on these upgrades, but am hoping for some good recent advice, as many threads are 10+ years old and there appear to be more options available and I have not found anything on the 87.5mm option with an “E” or Solex grind...
Thanks and Happy Thanksgiving!
Oliver Garthwaite
Portland, Maine