Author Archives: bowtie6

Final Pics of the New TR6 Frame

Here is a final set of pictures of the new frame serving as bowtie6’s backbone. The body has now been permanently bolted on, so this is the last set…

Some misconceptions have surfaced as to the origin of this frame. Suffice to say this is NOT (repeat, IT IS NOT) a RATCO frame. Those folks produce a nice aftermarket frame but this one is all bespoke and designed for the ECOTEC and the solid rear axle specifically.

Why so many entries on this blog about the frame? Well, simply put: I am very proud of it. My cousin Jim Thompson has put together a very clever, lightweight and strong frame using modern frame-building techniques and materials while being able to retain some of the original TR6 bits.

The front suspension is almost all stock TR6. The “A” arms, ball joins, steering rack, sway bar, trunions, hubs and rotors are all stock Triumph. The calipers are Wilwood. The springs/shocks have been replaced with coilovers. The coilovers offer several advantages: no spring compressors, spring interchangeability and the ability to control ride height. However, they are not cheap but worth every penny.

The rear is all new and it is trick! The axle is an 8” Ford, custom sized. It was cut on both sides and custom cut axles have been sourced from Moser. The gears are from Motive; posi-traction (of course) with a 3.80 to 1 ratio. Disc rotors and calipers are used on the rear end (with full emergency brake capability using the original TR6 cables and lever), as well as matching coilovers. There is a four point suspension holding the axle in place with Heim ends on all four control arms. We tried polyurethane ends, but they did not survive the power from the ECOTEC. Enter the Heim ends. Again, only the best have been purchased. These are precision ground steel (normally used on sprint cars) along with special boots to keep debris out. Brake and fuel lines are all hand made, hand fitted and hand formed from stainless tubing; with teflon lined, braided lines going to all four calipers. Again, only the best has been sourced.

This is the second frame built using this design. The first frame is under Jim’s TR4 and it has proven to be astounding. It is very stiff – gone is the ‘flex’ that the original frame exhibits. The new frame is made from much stronger square tubing. This tubing is a solid square, not a “U” channel with a cap spot-welded as in the original design from Triumph. I repeat, this is very strong stuff.

Finally, the ECOTEC 2.4 litre engine sits on special plates (on the frame side) that allow the use of the original Solstice engine mounts as well as tranny mount. The mounts are really nice because they are made with rubber to help isolate vibrations. Furthermore, the GM mounts have a locking mechanism that if the rubber ever fails the engine will only rock a very small distance and the locks keep it from making undesirable and expensive damage.

Finally some thoughts:

I realize this frame has nothing in common with the ‘original’ frame. My condolence to the purists – but the idea is performance and this frame works and works very well.
I’ve read where folks discuss the shortcomings of the AISIN gearbox and say the gearing is all wrong. Depends what you want to do: bowtie6 is not built as a drag car. Yes, first gear is a bit tall and that might not sit well with folks. I don’t mind it. From the experience gained from my prior setup and my cousin’s TR4, the car excels like a dream in second, third and fourth. These three gears are quite simply awesome. What about fifth? Well, suffice to say that at speed and in fifth gear all you have to do is punch it and the car will take off.
The last thing about the new frame has come as a bit of a surprise to me. In my cousin’s TR4 the steering “effort” has been reduced significantly. The “far-back” engine placement has something to do with this. But there is also the extra pressure of the original spring pushing on the “A” arms that has been deleted. The new “feel” is much more positive, lightning-quick and a delight to use at parking-lot-speeds.

Here is the final picture gallery of the frame prior to the body being permanently installed.

ECOTEC in a TR6

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Today was a milestone.

bowtie6 had a trial fit of body, new frame and ECOTEC engine. The following pictures show what this all looks like.

Yes, there has been some “shaping” done to the body. The area past the firewall was in need of change to make room for the oil filter (on the driver’s side) and the thermostat housing (on the passenger’s side). For anyone thinking about doing this to a “stock” TR6: beware. There will be some work required on the firewall as well as the battery box tray on the stock TR6. Since bowtie6’s firewall had already been modified, this was a small change. Under the experts hands of my cousin Jim Thompson, there was some welding involved and voilà – the engine fits.

Once all that work was completed, I mixed up some of DuPont ChomaOne single stage urethane red paint and the bare areas were re-painted. This took some doing but the result is awesome. Tonight the new areas are drying and the plan is to bolt the new frame to the body permanently tomorrow.

Well… Here is what an ECOTEC looks like in a TR6 with a custom frame underneath it. Note how far back the new engine sits. This change is highly desirable in moving the weight back. This is indeed a great day!

ECOTEC, Meet Gearbox; Gearbox, Meet ECOTEC…

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bowtie6‘s ECOTEC permanently met the new AISIN 5 speed Solstice gearbox. It took some doing to get the right bolts because they were not supplied with the Mallett “take out” engine. But, after some searching, I found the nine metric bolts that hold the two together. Here are some pictures (and a little extra) of the event. The clutch actuator has been installed, the only thing missing is the special metal pipe that fits on the side of the hydraulic actuator. This pipe will be modified so I can use my Camaro clutch master cylinder. I’ll pics on that later.

BTW, the header you see has all been hand made from stainless tubing. The bung for the O2 sensor will be on the other side of the flange. Take a look:

bowtie6‘s New Frame – Check It!

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The new custom frame is done.

After much anticipation, the new custom frame is finished. It has taken a lot of work by my cousin Jim and I could not be happier. There are plenty of pictures – they are at the bottom of today’s entry in a gallery, but first here is what we have:

The frame looks different from the original setup. This was done for several reasons, but mainly for strength. The next was the ability to mount the rear solid axle. One of the main concerns I always had in the back of my mind was whether the hubs/halfshafts would fail. This time, the new axle will handle all the power on tap with no reservations. This time, the diff is posi-traction with a 3.80 to 1 ratio.

The rear calipers I had on the old frame have been adapted to work with the new axle. As you will see, the front calipers are the same Wilwood’s from the original build. The original mounts were retained. All brake lines going to the calipers are the ones used in the past build – braided teflon lined. And, there is also a picture below showing the location of the Wilwood proportioning valve. All brake lines have been scratch made from stainless tubing fitted by hand. They look killer!

Coilovers have been used on all four corners. This part took a bit of research and the spring rates took some careful consideration. These are the same settings used on my cousin Jim’s TR4. Not only do they look awesome but they perform equally well. They are quite pricey but just the fact there will not be any more spring compressors involved makes it worth the trouble.

The ECOTEC 2.4 engine is now mounted using the original Solstice mounts. Special pads were made to go on the frame and this is where the mounts anchor. Ditto for the transmission mount. This is all done with a very specific purpose: to make room for the exhaust and have nothing ‘hanging’ below the frame.

There is a ton of more subtle details – I am sure you will find them. If you have any questions/comments drop me a line. Here is the new frame gallery. Enjoy!