[Fot] GT6+ engine in a TR4

[Andrew Packard]

Thanks for all the responses!

Based on the replies, we'll try and move the engine back a few inches to allow for the use of the stock steering arrangement.  That may allow the TR4 cross piece to be used.  When we got the car, it already had a 13b rotary swap in it with tags indicating last on the road in 1991, so we have no TR4 motor to go back to and we are locked into using the TR4 frame.  We've moved away from the rotary concept and are down the 6 cylinder TR solution path.  

I'll be glad to update the group as we make progress and hit the next hurdle.

Andy

On Feb 20, 2017, at 1:41 PM, John Styduhar wrote:

> Isn't the TR4 frame very similar to a TR6 frame? No, except it is made from very thin box section.  The TRA IRS is similar.  The rear axle setup, front and rear suspension , engine mounts, etc. are different.
> Shouldn't the 6 cylinder motor fit in similarly as a TR250 motor?  The TR250 engine is the same as the TR6, not the GT6.  The TR250 and TR6 frames are very similar if not the same.
> The 6 in a TR6 is a snug fit with about 1/2" clearance from dampener to steering rack.
> Would just adding TR6 mounts solve this problem? You will need to figure out where to fasten the TR6 mounts to the TR4 frame.  The TR4 engine mounts are located on the inboard spring towers which are probably to forward to the 6 cylinder engine. 
> The TR6 transmission is the same dimensions as the TR4 transmission.  Yes the cases are very similar but you will need to fab up the rear trans mount location and probably a custom length driveshaft
> 
> 
> On Mon, Feb 20, 2017 at 11:34 AM, Charly Mitchel via Fot <fot at autox.team.net> wrote:
> Isn't the TR4 frame very similar to a TR6 frame?
> Shouldn't the 6 cylinder motor fit in similarly as a TR250 motor?
> The 6 in a TR6 is a snug fit with about 1/2" clearance from dampener to steering rack.
> Would just adding TR6 mounts solve this problem?
> The TR6 transmission is the same dimensions as the TR4 transmission.
> Charly Mitchel
> TR6 #44
> 
> ----- Original Message ----- From: "Bill via Fot" <fot at autox.team.net>
> To: "Andrew Packard" <apackard68 at att.net>
> Cc: "'Friends of Triumph' Triumph" <fot at autox.team.net>; "John Sisler" <jsisler at cruzio.com>
> Sent: Monday, February 20, 2017 7:15 AM
> Subject: Re: [Fot] GT6+ engine in a TR4
> 
> 
> Don’t move the rack unless you are prepared to either do a lot of engineering or to drive a car that steers itself—generally in the wrong direction. You’ll get lots of bump steer. the car probably has all it needs already. Much easier, and generally better, to move the engine back and maybe down a bit. You’ll need a shorter driveshaft, and none of the stock engine and transmission mounts will work, but that’s easy to fix and the weight bias will be much better.
> Bill
> 
> On Feb 19, 2017, at 9:32 PM, Andrew Packard via Fot <fot at autox.team.net> wrote:
> 
> Hi FOT'ers
> 
> We lowered the GT6+ engine with TR6 tranny into the TR4 this weekend, quickly discovering the steering rack position needing to go forward and the need for an engine mount solution.  I turned to Tony Vigliotti at Rat-co for advice and provided pics to him.  I'm looking forward to his response and guidance as Tony has always been extremely generous with his time and advice.
> 
> I also wanted to reach out to this group to understand if anyone had made this swap and what their solution was for the fitting issues.  I'm thinking we could just weld in an added cross member and move the steering rack mounts forward by attaching to this new piece.  For the engine mounts, I have no idea what the stock mounts are in a TR4 so I don't know if fabrication or stock parts solutions are needed to secure the engine.  Any specific examples of your solutions are appreciated. Please remember this is a 24 hours of Lemons project and we are looking for an extremely cheap and DIY solution.
> 
> Andy Packard
> Bay Area CA
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