Adjustable pedal box help needed

[Ronart boy]

I'm building a Mk1 Ronart W152. this kit came with a fixed pedal box. To make the car more usable, as it has fixed seats, I am wanting to change the fixed box to one that moves forwards and backwards. Has anyone done this before, if you have, could you provide me with details of the design and set up that was acceptable with IVA so that I can fabricate something similar.

I seem to recall that the Marcos had a system that used a screw rod and a turning handle fixed under the dashboard, and some modern cars have an electronic system.

Thanks
Howard

[Steve_D]

Is the pedal box floor mounted or under dash mount?
Floor would be easiest.
I would make it fixed for IVA then mount it on runners later.

Steve

[JontyR]

Ronart boy said:

I'm building a Mk1 Ronart W152. this kit came with a fixed pedal box. To make the car more usable, as it has fixed seats, I am wanting to change the fixed box to one that moves forwards and backwards. Has anyone done this before, if you have, could you provide me with details of the design and set up that was acceptable with IVA so that I can fabricate something similar.

I seem to recall that the Marcos had a system that used a screw rod and a turning handle fixed under the dashboard, and some modern cars have an electronic system.

Thanks
Howard

My interpretation of the IVA rules is that you can have the pedal box moving for adjustment, but the bias bar needs to be fixed. Whereas before it needed to be a fixed bar, you can have an adjustable bar but it needs to be lockwired into place for the IVA.

As for designs, you have a choice:
1. a worm drive, depending on the level of fine adjustment you need will be dictated by the thread on the screw. I would go for a coarse thread over a fine.
2. a plate with a series of holes. This would probably be more acceptable since you have to physically go into the footwell to make the adjustment. I would make sure you have a failsafe though and double bolt it...even lockwire as the last thing you want is for the pedal to disappear as youd be up that creek!!

Maybe though, as Steve says, just make everything fixed and then look to move it after.

[Equus]

JontyR said:

As for designs, you have a choice:
1. a worm drive, depending on the level of fine adjustment you need will be dictated by the thread on the screw. I would go for a coarse thread over a fine.

As per the Marcos:

JontyR said:

2. a plate with a series of holes. This would probably be more acceptable since you have to physically go into the footwell to make the adjustment. I would make sure you have a failsafe though and double bolt it...even lockwire as the last thing you want is for the pedal to disappear as youd be up that creek!!

As per the BAC Mono:

[NoCorseChris]

Only complaint I had with the Marcos pedalbox when we had one was that when we got the car, the whole assembly rattled about a bit due to lots of clearance between the tubes & 'runners'. Easily sorted by drilling a 7mm hole though one wall of each tube, one hole near each end, welding an M6 nut over said holes then putting nylon screws in - instant adjustable clearance. If you wanted really fancy you could always use needle roller bearings I suppose.

[Ronart boy]

Thanks everyone, the infor is a great help. The box is top mounted but has a series of holes to allow the pedal spindle to fitted in differing positions, Like it has been suggested, it may be best to have this as post IVA modification

[Fastpedeller]

Ronart boy said:

Thanks everyone, the infor is a great help. The box is top mounted but has a series of holes to allow the pedal spindle to fitted in differing positions, Like it has been suggested, it may be best to have this as post IVA modification

I may be completely incorrect.... but it's worth checking if something (ie seat or pedalbox) HAVE to be adjustable for IVA? as to have no adjustment means it limits the driver(s) somewhat, and may not be IVA acceptable. Different shoes in many sole thicknesses

[Steve_D]

If the seating position is way out from 'standard' if there is such a thing the tester may want you to demonstrate that you can have full control of the vehicle. Just because that position does not suit him/her would not be a reason for failure. I don't know of any requirement for the seat to be adjustable. The closest I can think of is being able to see the mirrors and have suitable vision from the driving position.

Steve