Eugene
IN CONSIDERATION OF BUM-COMFORT
The standard bench seat in a Seven is in my opinion (I know, not in many others) a better solution to seating in a Seven than the more 'trendy' sports seats. I say this as one who has driven over 100,000 miles in a Seven over the past 1 and ½ decades.

My basic reasoning is that a bench seat can be made to provide the perfect seating arrangement, unlike the 'sports' seat, which in my experience sits the posterior far too high and with little support in the correct places. Obviously this is not true of the full race seats, especially the individually formed ones, but those of you who know me of old will know that I always try to find the cheap alternatives whenever possible.

However, the standard bench seat is far from perfect. It lacks shaped support and still positions the posterior too high in the vehicle. But with a little work it can be made near perfect.

I first performed the following modifications back in 1989 after a tour around Europe, where the original seats had myself and passenger, Steve Porter (how's it going mate?) stuffing sweatshirts in various places to lessen the pain.

A recent rebuild of my car with a different chassis brought with it new bench seats. While these are more shaped then the old they still proved to be next to useless. So, after revisiting my old 'modified' seats once more the new ones were thrown out.

In Cross-section the basic bench seats as something like the following.

Original seat profile
The base for the squab and backrest are of thick plywood and the foam padding shapeless and thick.

I have found, after numerous empirical tests, that the plywood can be reduced in thickness to ¼ inch without effect, although I have left the backrest alone, as I do not require additional cockpit length. I have also reduced the base squab foam height by ½ while raising the height of the front to almost twice the height, producing more of a 'bucket' to sit into rather than on top of. On the backrest I added lumbar support to prevent strain on the lower back. This is something that is recommended by back specialists to aid holding a good 'lordosis'.

The seat covering is easy to remove by carefully extracting the staples from around the edges and I have found they can easily be reused (the covers that is) over the new shaped seats, and re-stapled into place. The best thing for cutting the foam has proven to be an electric carving knife (don't tell the rev-limiter!).

The results are something like the following. I did try to photograph the seats, but it's a bugger trying to photo black vinyl!

New seat profile
When seated my head is now well below the role bar (standard item not FIA) and I feel I am wearing the car rather than sitting in/on it. The reduction in foam within the squab seat area has been offset by the use of thin plywood, allowing the seat base to flex but providing more strength and support than the ally floor.

I have also found the above conditions improved further when I decided to rebuild Eugene with a Long Cockpit chassis but maintaining the bench seats. The result is a seating position even lower with a better feeling of being within the car not on top of it as by maintaining the 'short cockpit' seat squabs I have been able to increase the rake or angle of the rear backrest by spacing the backrest lower edge away from the rear of the cockpit, making the seating position more reclined.

And as someone who suffers with a bad back I can guarantee the modifications work.



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Eugene - upclose and personal

DANGER
No one gets off this planet alive!