When I purchased the 3 motors en block, the seller was under the
impression that all were FC's.. however he had not done any teardown and
frankly I am at a loss to determine the difference looking at the external
aspect of the 4 port FC's and FD's...The only clue that jumped out at me was
the corner seal springs, otherwise they looked and felt similar (no scale
handly).
Hi
Dave,
I looked at
your picture of the cannibalized engine, and can see enough to say that it's
not an FD. The FD did not use the crank angle sensor that I
see in the picture, and the water pump housing was much different. So,
assuming all your engines have very similar looking front
covers, I'd say they're all 2nd gen.
Next
problem, is figuring out what year the engine is. As you can see from
the chart, there are two listings for 2nd gen turbo engines, and they used
rotors that were different in compression, and weight. If I had to take
a wild guess, I'd say that maybe the second engine you opened up was the
later 89-92 version, which "may" have had the improved corner seal
spring. Again, that's just a SWAG. Here's what you can do
though- get access to a scale that's accurate enough to tell the
difference between 9.54 lb, and 10.04 lb. Finish tearing down the
second engine enough to get the rotor out, and clean it up. Now you can
weight that rotor, and the original one from the first engine. If you're
luck, the will weigh the same.
Good
luck,
Rusty (no
fair putting your thumb on the
scale)