Rick's rebuild Update- good news so far

[Rick B]

The machine shop has finished their inspection. Need alot of work on the case, but all normal issues for a 40 year old engine (rebore, clean, squitters, inserts, replace exhaust studs that I broke, etc). I plan on shuffle pins, but need help on deciding several other options.

The P&Cs need replacing, so I will go with the Nickies in 87.5MM size to give a displacement of 2.39 (same as 1970 ST). Probably will use ARP head bolts and rod bolts.

Still thinking about the cam. Machine shop said that the cam needed regrinding. Talked with Camgrinder: he recommended the DC30 profile as this is built on the E cam and has the same lobe centers as the E. Should not need to change the MFI. What are the thoughts on the forum: Stay with stock E or change to DC30? I definitely cannot afford mods on the MFI pump.

Porting and polishing is expensive. Bruce Anderson's book suggests that it is money not well spent for a street car. the stock E ports of 32mm or widened to 36MM? What is the experience of the forum?

Balancing is the next question. Is it needed? If I balance, i will need to buy the clutch kit now rather than later. Is the OEM clutch OK, or should I look for an upgrade?

What about a lighter flywheel? does this make sense in a street car?

Thanks in advance for the comments. I have been following the several threads on 2.2 / 2.4 rebuilds, and decided on the 1970 ST displacement as a result of comments from the forum. As these are expensive decisions, I rely on the comments from the experts on the forum to make the final decisions.

Rick

[dtw]

Sounds like a great motor. Are you considering going up to the 70.4mm crank and rods while you're in there?

I'm running DC30 cams and 9.8:1CR pistons on 70.4mm crank, it makes for a really fun engine. After running some calculations, I opened my intake ports up to 34mm. My MFI pump is modified, but I think you could probably get away with your E pump no problem.

After building this motor, I definitely had to add an external cooler - something to keep in mind. I see you're semi-local - PM me if you want a ride sometime. I'm usually at the PCA coffee on Saturday mornings. I've got some factory cooler/line/thermostat setups too, if you need one.

[Flieger]

Porsche engines are well balanced from the factory. When you change pistons/rods/etc. you, the engine builder are tasked with balancing to Porsche specs. Clutch parts are generally "zero-balanced" separate from the engine to allow replacement without causing bad vibrations. Engine internals are done together- rods, pistons, pins, crankshaft.