Pelican Parts Forums - What car is a better buy: a rebuilt 2.7 (74-77) or an SC that has never been rebuilt

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- - What car is a better buy: a rebuilt 2.7 (74-77) or an SC that has never been rebuilt (http://forums.pelicanparts.com/porsche-911-technical-forum/610130-what-car-better-buy-rebuilt-2-7-74-77-sc-has-never-been-rebuilt.html)

Quote:

Originally Posted by Flat6pac (Post 6052977)

The cost involved of rebuilding a 2.7 vs. a 3.0, the 2.7 requires way more $ at the machinist because of the intrinsic problems of the magnesium. Case savers, dilivar head studs, line bore and the price of specific bearings, decking the twist out.
Save your money, sell the core and buy a 3.0 and a cooling system if the car doesnt have it.

Bruce, I am learning as I go here; that makes sense, thank you for the information.

One thing I don't understand from what you said:

Quote:

Originally Posted by Flat6pac (Post 6052977)

Most of the mid cars had air installed at the dealer so there is no factory cooling for the engine. If the 77 has a console there is a factory cooler installed was the norm.

Does that mean the pre77 middies had AC installed at the dealer, and therefore do not have the trumpet cooler in the passenger side front fender?
And does it mean that the 77 with AC has a trumpet cooler installed from the factory?

My 77 has AC (though it is deleted now :) ) and the trumpet cooler is where it is supposed to be. This last week it actually got up to the 80s F here in Rochester, NY, and I was able to get the motor to 210 with some flat out runs on the highway. When I got back home, I felt the trumpet cooler, and it was only slightly warm. I am wondering if I would need to upgrade the cooler with the weather so mild in this part of the country.

to reconcile the price differences, you have to examine the risk distributions for each type of engine, and then assign a dollar value to each risk distribution... then you try to figure out (from the records) how each particular example of the two types of motors deviates from the average (expected value) for each distribution -- simple, right?

if you are a machinist and have free access to all the tools you need, then buying a cheaper 2.7L motor is a no-brainer (I told a bicycle machinist to do just that)

if you are willing to take a chance (more chance than with an SC motor), then get the cheaper 2.7L motor

if not, get the SC if it is a good example.

PS - Mg cased 2.7L motors get bonus points for low miles (but why were the miles low?) and for never, ever having had thermal reactors on them

above is one reason the '74 cars are often sleeper bargains, tho people are starting to figure that out