Lotus Elan

Concentric Slave

PostPost by: "Stan Aarhus" » Wed Jul 31, 2002 3:32 am

Hi All,
My S3's clutch release arm is pretty ratty at the throw out bearing end
(I could probably weld it up if I had to) so this gives me a good excuse to
pursue the concentric slave approach. It has been suggested that the Saab
900 Turbo concentric slave cylinder is the easiest to adapt, Since the Saab
part new costs less than the (unobtainium) clutch release arm, I believe
that it is worth investigating.

I'm pretty sure that someone out there has already done this conversion, but
I am wondering if anyone has specific drawings, measurements and other
information for what is needed. I do not have the Saab part yet, this is a
feasibility check. Here is what I know so far:

I would have to use the later pressure plate where the convex throwout
contact engages the bare clutch fingers.

So much for what I know, now what I don't know.

Can the existing input shaft housing be adapted?
If not, is there another housing that can be adapted?
What is the slave piston travel using a standard S3 master cylinder, which,
I believe has a 5/8 inch bore?

Thanks in advance!

Stan A.
"Stan Aarhus"
 

PostPost by: "kstrutt1" » Wed Jul 31, 2002 7:49 am

Stan,
I have done this on a sierra five speed gearbox and a Ford Scporpio
cylinder which I believe may be similar to the SAAB part, although
the parts are not interchangeable the principle should be, I retained
the original oil seal housing and machined the front face back such
that there is a flat mounting surface and the nose is removed. I then
made a alloy carrier for the slave cylinder which bolted on top.
my drawings should still be in my folder in the files section.

Kevin.



--- In [email protected], "Stan Aarhus" <[email protected]> wrote:
Hi All,
My S3's clutch release arm is pretty ratty at the throw out
bearing end

(I could probably weld it up if I had to) so this gives me a good
excuse to

pursue the concentric slave approach. It has been suggested that
the Saab

900 Turbo concentric slave cylinder is the easiest to adapt, Since
the Saab

part new costs less than the (unobtainium) clutch release arm, I
believe

that it is worth investigating.

I'm pretty sure that someone out there has already done this
conversion, but

I am wondering if anyone has specific drawings, measurements and
other

information for what is needed. I do not have the Saab part yet,
this is a

feasibility check. Here is what I know so far:

I would have to use the later pressure plate where the convex
throwout

contact engages the bare clutch fingers.

So much for what I know, now what I don't know.

Can the existing input shaft housing be adapted?
If not, is there another housing that can be adapted?
What is the slave piston travel using a standard S3 master
cylinder, which,

I believe has a 5/8 inch bore?

Thanks in advance!

Stan A.



"kstrutt1"
 

PostPost by: tvacc » Wed Jul 31, 2002 12:42 pm

I believe the guys at JAE have already done this and have the parts...

Tony V
-----Original Message-----
From: Stan Aarhus [mailto:***@***.***
Sent: Tuesday, July 30, 2002 11:32 PM
To: Lotus List; ***@***.***
Subject: [LotusElan.net] Concentric Slave


Hi All,
My S3's clutch release arm is pretty ratty at the throw out bearing end
(I could probably weld it up if I had to) so this gives me a good excuse to
pursue the concentric slave approach. It has been suggested that the Saab
900 Turbo concentric slave cylinder is the easiest to adapt, Since the Saab
part new costs less than the (unobtainium) clutch release arm, I believe
that it is worth investigating.

I'm pretty sure that someone out there has already done this conversion, but
I am wondering if anyone has specific drawings, measurements and other
information for what is needed. I do not have the Saab part yet, this is a
feasibility check. Here is what I know so far:

I would have to use the later pressure plate where the convex throwout
contact engages the bare clutch fingers.

So much for what I know, now what I don't know.

Can the existing input shaft housing be adapted?
If not, is there another housing that can be adapted?
What is the slave piston travel using a standard S3 master cylinder, which,
I believe has a 5/8 inch bore?

Thanks in advance!

Stan A.
Tony Vaccaro
http://www.lotusowners.com
LOONY (Lotus Owners of New York)
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