Bulent,
What did you do to make it compatible, then? I would be interested in
seeing pictures....Tracy did tell me the 3rd gen flywheel does not fit
his redrive, either. Did you modify the one you had?
Marc W.
Hi Marc,
The 20B/Cosmo flywheels have few differences:
1 The ring gear is wider (teeth are longer )
2 The teeth are beveled on the back side since the starter engages from the
back
3 The holes do not match Tracy's pulse dampener.
I wanted to keep the starter and the bellhousing. So I made a disk from
1/8"
cromaloy to fit just inside the ring gear and matching holes for the
existing ones on the fw. Than match drilled holes to fit Tracy's pulse
dampener. Nothing special. All the dimensions are in front of you. All you
have to do is cut the disc and match drill 9 holes. I have no pictures
since
I never thought I'll need them.
Bulent
Gee, that sounds too easy. The flywheel [flex plate] you describe sounds idential to the
20B and to the 13Brewtt auto tranny types. Thanks for the information.
Marc W.
The 20B and Cosmo FW are identical Marc.
bulent
It think we should be clear here. "The 20B and [13B] Cosmo [flex plates] FW are identical"
Perhaps the Cosmo 13B had an optional manual transmission using a flywheel.
I don't really know.
Paul Lamar
To be even clearer:the 1993-1995 13Brewtt auto tranny models
also has the same identical flex plates and starter arrangements as the 20B.
Marc W.
Here's my two cents worth on this thread-
I bought a '93 j-spec 13brewtt, I don't know what it was out of- could have
been a cosmo, maybe an RX-7, I don't really know. What I do know is that it had
a manual flywheel, which bolted onto the counterweight. I have since switched to a deep-
dish(that's what I call it) automatic flex plate, which bolts right on to
the counterweight. I find all this discussion of counterwieghts spot
welded onto flywheels/flexplates a little confusing, since I only have
my engine to look at for comparison.
I don't know if this illuminates anything for anyone, or if I'm just
confusing things. All I know is- the manual flywheel was a balanced
assembly- that is, it had no counterweight attached. So I assume that
the separate counterweight provides the balance and whatever flex
plate or flywheel you put on is ok, since it does not provide any counterweight.
Brian Trubee
Brian,
That's exactly right. On my 20B using Tracy's re-drive, I replaced the 20B flex
plate with a 13B flex plate, using the 20B counterweight. If its out of
balance, you would never know it. It runs
as smooth as anyone could expect. Hope this helps some.
Mark S.
I want to also define our terms here. A flex plate is found on auto
TX's and a flywheels is found on manual TX's. Please don't confuse
the issue by using the term flywheel for flex plates or vice versa.
The first picture is a flexplate.
The second picture is a counter weight.
The third picture is a flywheel.
Paul
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