Working out a BEC project, several questions so far.

[Reliant]

Its progressing slowly

I had to redesign the laser cut parts to tweak the chassis set up a bit so thats taken a bit longer due to the backdoor laser cutting supplier I have, that plus life in general.

I also needed to fix my car since i need to trailer the chassis to the welders 😅

As soon as anything substantial is done I will put it here.

Thanks for the interest and advice

[Chris-S]

Glad it’s ticking along still, despite the distractions and side-projects. Sometimes life feels like a bad adventure game doesn’t it - just when you think you’ve reached a landmark, you find you have to do some other, apparently unrelated and random thing in order to proceed.

I’ll keep checking in and wait patiently

[Reliant]

Hi

I do have a generic chassis question however.

Before finalising the plans I have struck something I'm not certain about.

Is there a way to get an idea of suspension travel needs ?

Basically i have approx 2 inch of wheel hub movement up and 2 inch down before encountering any major clearance issues between the half axles and chassis rail.

I have no idea whether that is ample enough (just in case) for a light coilover fitted track car or if I need to anticipate more.

[Reliant]

Riiight.

I've had a bit of spare time so I've spent it on working out some more on this project. It needs to be well on its way by the end of the year because i would like it fully functional by 2020.

Current headscratching is regarding the brakes.

The OE system has two 18mm piston brake cylinders upfront, and one 17mm piston brake cylinder on each side at the back.

So basically Reliant balanced out the bias almost equally.

I tried to keep that in mind while searching for caliper alternatives.

Here is what i have come up with :

Front :

A mix and match :

Ford Fiesta mk3 caliper (49 mm piston)
Renault Twingo mk1 disc (240 mm)

All hosted by a morris minor rim (excellent as it is 4x101.6 PCD and big 14 inch diameter) it will need widening however because stock it is 3 inches wide and to preserve closest possible to stock tyre diameter i need to use a 155 tyre so i think i need around 4.5 meaning i need to slot the center into a modern rim hoop)



The disc just needs to be machined (overbore to fit snugly on the Reliant hub so it will be naturally centered).


Back :

I tried to find the smallest diameter piston calipers possible (within reason) and after hours of search and realising that most car use the same parts regardless of year brand or model, heres what i came up with :

Fiat Uno turbo calipers (30mm piston)
Fiat rear discs (227 mm diameter)

I havent quite got 50/50 in piston diameter total front/rear so i might need a bias knob but the fact that the rear discs are smaller in diameter means less leverage so in theory less power at the back ?

The BMW hubs are getting redrilled (to 4x98, like the Renault 5 turbo rims I am using for the car) and turned so they fit into the discs that are also 4x98 being Fiat items.

I also received all the steel for the chassis, I figured it would be better to build it new and not have to faff around welding a chassis that originally is galvanised...

Edited by Reliant on Saturday 18th May 14:31

[Reliant]

Chassis getting tacked together and i got all the necessary parts laser cut (steering box and body mounts namely)





Next step is cutting into the rear of the rails to slip in the BMW axle bar

[Reliant]

More progress it's starting to look serious now. Trying to set the motor in and work out the mounts.










Am I right in thinking that the engine needs to be slightly tilted to the rear for alignment with the diff ?

If so, any angle recommendations ?

[Reliant]

Looking desperately at £500 and up CNC flat oil sumps, i was lucky to score this modified rewelded one on ebay for 170



Engine height level therefore set, i figured out all the tabs and spacers needed to fit the engine.

Just waiting for the parts and all the chassis will be tacked and sent to the welder

Edited by Reliant on Thursday 17th October 16:35

[Reliant]

Chassis is finally fully welded

Brake, fuel, coolant lines and wiring are next on the to do list to be set up

[Erazor]

Just found this build and great work, here is my take with my Bond Bug, ZZR1400 into a Quaife reversing box to a BMW 318i LSD using MGTF swinging arms and hubs.