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[Fot] TR4 Lemons race car project restarting

Subject: [Fot] TR4 Lemons race car project restarting
From: apackard68 at att.net (Andrew Packard)
Date: Sun, 8 Jan 2017 15:46:05 -0800
References: <0697AD95-E87C-4BC4-BD02-9AE9B30D4335@att.net> <CAMmo4o9qiHvGvi0R7fv49H-ZAf6O1k4U2_75NTUVxbUEKQgrDg@mail.gmail.com> <5E240330-F139-4B65-9389-6C6DFC1E95C1@me.com>
Scott,
Thanks for reply.  We have GT6+ engine. We'll be using all TR6 stuff for the 
throw out bearing so hopefully few issues there, but we'll keep track of this 
additional potential issue.
Andy


On Jan 8, 2017, at 6:20 AM, Scott Janzen wrote:

> I also run a Tr4/6 box in my GT6.  As Andy says, you need the TR6 engine 
> plate, and probably an extended pilot bushing (mine extends out to the face 
> of  the GT6 flywheel).  Clutch splines are different so you may need to use a 
> Tr4/6/7 clutch disk, or have one made.  Though it?s expensive, the gear ratio 
> issue can be addressed with a Moss Europe close ratio set, which greatly 
> raises 1 and 2, three slightly and leaves 4 unchanged.
> 
> TR6 slave cylinders mount forward/below, GT6 rearward/above - not sure how it 
> will fit in your car.  Modifications are needed to the shifter fork and shaft 
> to accept the tapered bolt from the reverse direction for the GT6 
> configuration, and a new bracket to hold the slave cylinder.
> 
> The TR6 box is bullet-proof compared to the GT6 box - do not consider going 
> that direction.
> 
> Timing chain/gear - I think they are interchangeable - look on the Wishbone 
> Classics website or call Scott Harper at Team Triumph or any other supplier.
> 
> I assume you are starting with the later GT6 engine - not the early narrow 
> port engine?  GT6+ should be the later/better one.  
> 
> On Jan 8, 2017, at 8:08 AM, Jason Sukey via Fot <fot at autox.team.net> wrote:
> 
> Hi Andy, 
> I ran a TR gearbox in my GT6 street car for quite a few years.  The gear 
> ratios aren't as sweet as the GT6 box, but it's a nice stout piece.  The TR6 
> rear plate is what you need.  I'd stick with the GT6 flywheel though, it's 
> lighter than the TR flywheel.  They use the same pressure plate, so no 
> worries, just use a TR6 clutch disc.  You will need to make a custom pilot 
> bushing. 
> 
> Jason Sukey
> 
> On Jan 8, 2017 12:18 AM, "Andrew Packard via Fot" <fot at autox.team.net> 
> wrote:
> Hello from Bay Area:
> 
> We have finally restarted our TR4 24 hours of Lemons race car project.  
> Initially we were going to use a rotary drive train from an RX7, but have 
> since abandoned that and returned to a Triumph drive train.  Thanks to Jeff 
> Durant, we now have a GT6+ engine.  We have a 4 speed TR6 tranny to start, 
> but after a test fitting on the GT6+ engine it's a close but not quite a fit. 
>  The main concern is that the starter mounting area does not match up.
> 
> What are the options for this combo?  Do we need to use TR6 flywheel and rear 
> engine plate to make this pairing work?  Have other used this?  What 
> alterations/combos are required to make this work?
> 
> Second question:
> I do not see two row timing chain and sprockets for sale for the GT6+.  Are 
> the TR250/TR6 components compatible?
> 
> Thanks for the support of the group as we work through our issues to get a 
> 100% Triumph powered TR4 on the track!
> 
> Andy Packard
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