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Author Topic: Rear crossmember  (Read 84 times)
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squiglyzigly
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« on: June 09, 2024, 02:17:18 PM »

I think the rear crossmember is an overlooked component that is easy to improve if you have access to a welder.
It’s a fairly flimsy open box design that I think should be boxed in like Lancia did on the Delta and Thema.
Seeing as the transverse tie rod links mount centrally it makes the flimsy design vulnerable to twisting under hard cornering. As well as giving the rear suspension a more solid base when cornering I think it can be easily modified to stiffen up the rear chassis a little, a bit like a lower strut brace.

I’ve already made one for my HPE but that is some way off of being driven.
So this week I had to drop the rear crossmember to gain access to the fuel pipes that have started leaking on my VX coupe and whilst I was there I decided it was time to strengthen the crossmember and test my theory.

So this is my freshly painted idea.


* IMG_5638.jpeg (432.68 KB, 1280x960 - viewed 32 times.)
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VX HPE (resto started Sept ‘21)
Beta Saloon 2.0l s2 1979 (completed July 2020)
Beta coupé VX (completed April 2017)
squiglyzigly
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« Reply #1 on: June 09, 2024, 02:30:56 PM »

As the spare wheel well is only around 20mm above the center of the crossmember I fabricated a small sturdy bracket that bolts the center of crossmember to the spare wheel well.

Then bolt it all back up and give it a spin.

As expected car car felt significantly different. The immediate feeling was a bit like some kind of mass-damper had been fitted to the car. It feels more sturdy and better built. I know my car has a good rust free chassis as I’ve been under it for over 30 years (Not continually of course, I do come out for tea and beer) and purchased the car from a customer based on the condition on the chassis.
Then as I drove down the nearby roads admiring this new found sturdiness over speed bumps and pot holes I came across a roundabout.
Tip it in, squeeze the throttle and it digs in like a razorshell. It feels like the car has undergone a small all over upgrade.

All in all, I like it and there’s no downside.



* IMG_5635.jpeg (734.76 KB, 2100x1576 - viewed 32 times.)
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VX HPE (resto started Sept ‘21)
Beta Saloon 2.0l s2 1979 (completed July 2020)
Beta coupé VX (completed April 2017)
Nigel
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« Reply #2 on: June 09, 2024, 06:06:22 PM »

Hi again Ian,

Based upon your findings I'm sure I'll be doing something very similar to mine.

I like the additional centre support as well. The HPE probably has a deeper distance
to cover, but that's doable.

Cheers, Nigel
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1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
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