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Message
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)
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