Author Topic: Building a Lowcost 7 by Arthur Dent  (Read 6284 times)

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Offline Ultra

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Building a Lowcost 7 by Arthur Dent
« on: October 24, 2006, 12:42:10 AM »
http://www.autopuzzles.com/cfeature4.htm

By Arthur Dent
So why build a sevenesque style sports car? Well I’ve always liked the rawness of the Lotus Seven but the prices of the originals are way out of my price range, the modern replicas like Caterham, Westfield, Birkin, etc even more so. Well one day I was browsing the local book store in the automotive section and came across a book with a Seven on the cover with the title 'How to Build Your Own Sports Car for under £250' by Ron Champion. Flipping through it casually I got very excited and eagerly partly with $50 Cdn or so (it is much cheaper online). Ron detailed how he and his son had built a Seven (larger than a true Lotus but very, very close dimensionally to a pre-litigation Westfield) from a pile of scrap metal and a rusted Ford Escort MkII. The frame was welded up from 1”x1” hollow steel square tubing, most of the mechanical bits from the donor and major body panels either flat aluminum or bolt on fiberglass pieces. A lot of work to be sure but each individual step looked do-able. Between having kids, buying other cars and family budget constraints it was a couple of years until I was able to begin.


Sure the book budget was hopelessly off but most reasonable folks reckoned a basic one could be built for a couple thousand dollars. Sure beats a used Civic or something. The first stumbling block is a donor car – the book went with a Ford Escort MkII with front spindles from a Ford Cortina MkIII, neither of which was sold in North America. Really any small-engined rear wheel drive car would do but there were drawbacks to each (for example a Chevette has useable front spindles but a massive transmission and torque tube rear, old Corollas have strut front suspension, etc). There was no “perfect” donor.
Luckily there is an active and knowledgeable Locost community on the internet. Initially I did a pile of research and was able to determine that Hyundai used to assemble old Ford Cortinas for sale in their home market. When they developed their first car on their own, the Hyundai Pony, they used an early Cortina rear axle which happens to be the same as the Ford Escort MkII (as used in the book). Hyundai also built the Stellar in the Eighties, which was essentially a Ford Cortina MkIII with a styling again by Italdesign and engine and transmission from Mitsubishi. So the front spindles could be sourced here. Unfortunately for Americans these cars were never sold in the US due emissions standards. Originally I figured I was doing a budget build so I bought a 1986 Hyundai Stellar GSL with 1.6L Mitsubishi 4G32 engine and 5spd transmission as my main donor. I sourced a low mileage Pony axle, Honda motorbike muffler, Minilite style wheels and a Triumph Spitfire gas tank. I was ready to build the frame.

Then I learned that my wife was pregnant again with our third so I decided to look at pre-made frames due to the new time constraints. Luego, which is one of the bigger names over in the UK, has a distributor in Innisfail, Alberta, about an hour and half drive from me. I ended up buying their demo pile of parts that included frame, fiberglass body panels, aluminum side panels, steel floor, and suspension bits. It was more money than I had originally planned to spend on the whole car initially but the quality was very good. I hauled the frame and other pieces home in the back of my wife’s minivan, which caused a few curious looks for other drivers. I quickly got it to “rolling chassis stage” or would have if I had any tires on my rims. Since I spent all this money on the frame I couldn’t possibly put in an old Hyundai motor could I? Of course not so one thing lead to another and I decided that I’d need to upgrade my choice of power plant. Size a real concern in a Seven – especially height but I think I’ve found my ideal engine that will be revealed in the next update when the deal goes through for sure.
“Honi soit qui mal y pense”


Click the pic....... Name the car

Offline Otto Puzzell

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #1 on: October 30, 2006, 04:36:06 AM »
Awesome project. Keep us posted!
You wanna be the man, you gotta Name That Car!

Offline porridgehead

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #2 on: October 30, 2006, 08:13:42 AM »
Without question, please keep us informed. This is one of the automotive projects on my life list. There's something about creating not just a car from scrap, but a wickedly handling, immensely involving car. Of course, growing up in a town that had a Super Seven replica manufacturer may have had something to do with it. In fact, I think that seeing the tiny, scuttling 7s blat about town was what fueled my lifelong automotive interests. They were, and remain, like no other car that I have ever seen.
Measures with mics, marks with chalk, cuts with axe, beats to fit and paints to match

Offline Otto Puzzell

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #3 on: December 06, 2009, 09:37:08 AM »
Featured (again) on the front page!  8)

http://www.autopuzzles.com/
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Offline Arthur Dent

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #4 on: December 08, 2009, 02:12:02 PM »
Hmmm ... well over due for an update. The upcoming baby mentioned at the end is now 2 1/2 - car still isn't done though.

Part 2

After getting what is charitably called a kit (more accurately described as a pile of parts) I needed get one with it and find an engine. The Hyundai motor was tossed in the quest for more power. Initial candidates included:

    * early Miata - unfortunately Miatas hold their value really, really well around here so there was no chance of getting a donor Miata or used drivetrain for reasonable money. I did look into used engines from Japan, the price was excellent but they did not include any of the accessories or ECU which would have added up quickly. Using a Escort GT 1.8L motor with a Miata transmission would have been another option.
    * Alfa Romeo - I briefly considered these but finding a good one and future parts supply seemed to be a bit of hassle.
    * Toyota 4AGE - available in either 16 or 20 valve at reasonable prices they are a common choice for Seven builders. No real negatives to these except the proper bellhousing is slightly hard to find (from rwd Corolla GTS now sought after by the drifter crowd).

In the end I found a 4AGE motor with twin Weber 40DCOEs that had just recently been rebuilt. Had it shipped to the Montana border. Perfect! Now all I need was the illusive bellhousing and transmission. I was then able to find one in Saskatoon (six hundred some kms away) and it even came with a motor attached. I bought a little Mazda B2000 truck to retrieve them. The Montana pickup went as smoothly as can be expected. Picked some budget racing seats at the same time. The transmission was a bit more interesting. So I drove my $400 truck to Saskatoon during the coldest time of the year. The temperature plummeted to -40C (interestingly its the same in F) and met a guy late at night and pass the transmission plus an extra parts motor from his truck to mine. Felt a bit like a gangster making an illicit deal. Luckily my wife's Uncle lives there and we are able to stay the night for a visit. Even more amazingly the old truck starts up in the morning without being plugged in over night. A little less fortunately a huge snow storms blows through but i am able to make it home safe and sound. The truck is soon sold for the same $400 as my insurance company is demanding a safety inspection it has no hope of passing.

All the loot home safe and sound.





Since I have to attach the transmission to the good engine I figure now is as good a time as any to replace the clutch even though the one from the parts engine looks serviceable. The last thing I want to do is pull engine right away for a clutch job after getting it on the road. That goes smoothly but I won't be able to test the results until much later.

I'd previously bought myself a MIG welder so now was the time to learn. I watched the video that came with the welder and gathered up some scrap metal to practice on. It did not go well. The welder would just pop and leave something resembling popcorn on the metal. Weeks later and after much aggravation and self doubt I finally figured out that there was a pile of copper wire that was making the wire feed very erratic. I'd used the copper coloured wire before so I assume my unit was used and returned at some point. No wonder it wasn't working. With that sorted I was able to fabricate my engine and transmission mounts. Everything fit under the hood - just!

Front suspension was very straight forward and I was able to just bolt parts on - one of the very few areas where buying a "kit" paid off. I was able fabricate the rear axle mounts and eventually manhandle the axle in. A rolling chassis (just add wheels) now.



Offline Arthur Dent

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #5 on: December 08, 2009, 02:28:15 PM »
Part 3

Needing wheels are tires I spent a lot of time searching for cars that fitted my bolt pattern of 4x108mm - some Fords, old Alfas, Saabs, etc. I finally settled on some 13" Minilite style wheels from eBay and wrapped them in some performance rubber. Later I bought some 14" Superlights as well. Rolling chassis at last. Of course another house move interrupted progress once again. This time badly as the new house didn't have a garage at all. I was able to keep it at my sister inlaw's but unfortunately it was quite a drive to get there. Progress went from a stroll to a crawl but I was able to source a few bits and pieces like a radiator fan, Caterham rear lights, dune buggy front lights, etc. Its amazing how many parts such a basic car needs. Wiring was attacked yet and went quite well considering I'd never done anything much electrical besides clean dirty connections on my old Spitfire. The radiator fan was the first thing to move by itself which gives great self satisfaction. The signal lights took a bit more effort as there a minor error on the loom wiring diagram.

A zillion other small tasks like mounting seats, creating handbrake system, fabricating windshield and dash consumed some more precious build time.

Getting us to the present date I also have mostly completed the braking system after lots of frustration sourcing the proper fittings. Remaining is exhaust system (I've built one but not happy with it), wipers, electrical details, drive shaft and probably a few other details that will soon become apparent. I hope to be on the road this summer ... I said that about this time last year too.

A few photos of how more or less it looks now:





and a whole set of photos with details here: http://www.flickr.com/photos/daveseven/sets/72157594420123373/

Offline Otto Puzzell

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #6 on: December 08, 2009, 03:05:14 PM »
Hey - looking good. Much closer to 'done' than before. Has it been that long since Part 1?

 
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Offline Arthur Dent

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #7 on: December 08, 2009, 03:47:48 PM »
Just over three years  :(

Offline Otto Puzzell

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #8 on: December 08, 2009, 03:50:33 PM »
Wow - time flies.

I can only imagine large helpings of joy and smiles resulted from the now 2 1/2 year old addition to the family.

Not much longer before the littlest Dent can start wielding a wrench.  :D
You wanna be the man, you gotta Name That Car!

Offline Arthur Dent

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #9 on: December 08, 2009, 04:14:34 PM »
I think the smallest Dent was born with a wrench in his hand. The only one of the three boys to take an interest in cars.

Offline Otto Puzzell

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #10 on: December 08, 2009, 04:33:08 PM »
Same for the youngest Utz. And she's a girl!
You wanna be the man, you gotta Name That Car!

Offline Arthur Dent

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Re: Building a Lowcost 7 by Arthur Dent
« Reply #11 on: December 08, 2009, 04:39:10 PM »
Even better!