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Re: Lots o questions

To: Joe Curry <spitlist@gte.net>
Subject: Re: Lots o questions
From: Barry Schwartz <bschwart@pacbell.net>
Date: Tue, 23 Nov 1999 08:06:44 -0800
>Undoubtedly, you ordered a clutch for the Mk1 and got the smaller one. 
>When it comes to the MkIV and 1500 clutches, it gets a bit dicier.  The
>reason is while the pressure plate is virtually the same, the disks are
>different, owing to the different splines on the transmission's pilot
>shaft.  The Disk for all the three rail transmissions has the same
>splines (10 of them).  The single rail transmissions have finer splines
>and therefore more of them.  If you order a 3-piece clutch setup be sure
>that you specify whether your transmission is a single rail (late
>Spitfire) or a 3-rail (early one).  You should get the one for the MkIV
>if you have a 3-rail tranny connected to the MkIV engine.
******************************************
Actually it's a slight bit diceier than that.  Up thru 1972, the disk is a
6-1/2 x 10 spline.  From 73-74 it's a 7-1/4 x 10 spline, and then (1975 on)
it becomes a 7-1/4 x 20 spline (single rail).  The pressure plate would be
sized accordingly, so up thru 72 it's a 6-1/2 incher, and from 73 on it
would be a7-1/4 inch.  Anything with a single rail transmission should be a
7-1/4 x 20 spline, but a 3 rail could have a 6-1/2 or a 7-1/4 dia x 10
spline setup depending upon what year flywheel (or engine) it has - 


Barry Schwartz (San Diego) bschwart@pacbell.net

72 PI, V6 Spitfire (daily driver)
70 GT6+ (when I don't drive the Spit)
70 Spitfire (long term project)


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