SP 250 seat belts

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SP 250 seat belts

Post by NeilB » Fri Aug 04, 2017 5:44 pm

Hi, Can anyone recommend which seat belt arrangement to install and where to buy it? I don't really want the intrusion of an inertia system and would prefer a three point harness.

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Vortex O'Plinth
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Re: SP 250 seat belts

Post by Vortex O'Plinth » Fri Aug 04, 2017 6:03 pm

Probably the most robust installations are from Quickfit. To be properly effective, all the belt anchorages should be taken back to the chassis. Locally reinforced attachments to the glassfibre body almost certainly won't meet the requirements of BS3524. That's not to say there aren't many SP's with just such attachments, since seat belts are not obligatory on the car - Bryan Purves can supply such anchorage kits.

Quickfit do a custom inertia reel installation for the SP250, but it's not cheap - around £1000 I believe - but it does conform to the BS.

Andy Middleditch
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Re: SP 250 seat belts

Post by Andy Middleditch » Fri Aug 04, 2017 9:43 pm

I used the Quickfit three point aircraft style belts with Bryan Purves' stainless steel reinforcing fit. I'd recommend both.
Andy Middleditch

'B' spec Dart.

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Re: SP 250 seat belts

Post by NeilB » Wed Aug 09, 2017 9:23 pm

Thanks guys. Quick fit it is. Your help is much appreciated.

David S
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Location: Forest of Dean

Re: SP 250 seat belts

Post by David S » Sat Aug 12, 2017 8:42 am

Well, you need seat belts, just look at the top of the windscreen and think!

On mine I fitted 'static' belts.
I made some long steel liners for the wheel side of the rear wheel arches and anchored the tops under where the hood folds.
I also made a top hat arrangement to fo inside the transmission tunnel just in front of the back seat for the fixed part with a fastening clip on.
The bottom of the door post has a decent place ot attach to [i can't rememebr what just now].
I think inertia reels get in the way of the hood.

Some attach them to the rear bumper mounts for extra safety.

hope this helps

Ian Slade
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Re: SP 250 seat belts

Post by Ian Slade » Sat Aug 12, 2017 10:34 am

The two lap fixings will pick up existing chassis bolts for B/C spec cars, whether A specs will pick up a chassis bolt outboard of the seat I'm not sure, if using modern type solid clips each side of the tunnel then a right angle mounting is required. The shoulder strap mount on the wing does not need that much under wing reinforcing, the direction of load is mainly horizontal and would require considerable G to pull a 2" (50mm) washer through the wing, if it did pull through I suggest the engine would be sitting on your lap and you would be dead anyway to worry about it.
Owner since the 70's, Genghis is slightly to my left.

Geoff Douglas
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Re: SP 250 seat belts

Post by Geoff Douglas » Tue Aug 15, 2017 6:29 pm

A quick word about personal experience with inertia reel belts in the SP.

Over the course of 35 years with the one car I've "matured" from static lap and diagonal belts with the once customary reinforced shoulder attachment on the inner rear wing just lateral to the top of the rear seat back cushion; via inertia reel with the reel mounted on the floor behind the outer side of the seat (facing inwards) and a shoulder level belt loop attached to the B post using a plate mounted behind the hood frame attachments; to, most recently (during a DIY interior re-trim using a Bryan Purves kit of parts), inertia reel with the reel again attached to the floor behind the outer side of the seat (but facing forward this time), with the belt loop mounted to the rear inner wing mounting point with reinforcement again. This works better than either of the earlier two choices, particularly given the freedom of movement that inertia reel belts permit, and a more convenient positioning of the shoulder belt coming from the wheel arch rather than the top of the B post.

I've used Securon belts for both inertia reel set-ups, with two floor mountings to the chassis on either side behind the seats, and using cable mounted inner belt buckles this time rather than webbing mounted buckles, partly because I've used Newton Commercial front seats and cable buckle fittings enable easier one handed engagement of the belt tongue. The original seats have also been retrimmed and can be re-used if required. The final result is more comfortable than either of the earlier arrangements, partly due to the non-original front seats of course, but also due to the most comfortable inertia reel arrangement.



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