551 A race oddity

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Nick
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551 A race oddity

Post by Nick » Thu Aug 09, 2018 9:38 am

Do you really think the fire extinguisher will balance your weight :shock:


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551 A race oddity

Post by BigBobPilot » Thu Aug 09, 2018 5:40 pm

Nick wrote:
Thu Aug 09, 2018 9:38 am
Do you really think the fire extinguisher will balance your weight :shock:
Not on it's own no. But it's all accumulative.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Sat Aug 11, 2018 11:44 am

Thinking of George Formby songs,
When I'm makin' windows...
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Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by swoakes » Sat Aug 11, 2018 12:05 pm

I need to replace mine soon Ben As it is cracked.

What did you use? Any tips?


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551 A race oddity

Post by BigBobPilot » Sat Aug 11, 2018 1:02 pm

It's not finished yet, but its 4mm (as per MSA minimum thickness 5.20.8 ) Clear Polycarbonate sheet.

If you're happy with the fit of the current one, make a paper template from that to transfer to the new sheet. I had to go from scratch, as the old rear window was broken.

I've just bolted the flat centre section then gradually bent it round, then heated it a bit to help and get the final bolts in. I've gone for counter sunk M4 bolts, rather than the more commonly used number plate bolts, just to get it all flush, time will tell if that's a good idea.

Once it was bolted in, I've heated the corners up & left it. So I don't know if it's helped it take a set. I will need to pull it out and silicone it in place.


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SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by swoakes » Sat Aug 11, 2018 6:57 pm

Cheers Ben :wink:


Steve Oakes
SS1 DET Sprint Car

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1985 SS1 1600
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551 A race oddity

Post by BigBobPilot » Sun Aug 26, 2018 3:59 pm

The combined rear floor support & fire extinguisher mount is finished & bolted in. The rear of the heat shield is bolted to it, I was thinking of cutting this short, but I’ve decided to leave it long to protect the floor & the fire extinguisher. I need a bit more heat shield material to fit over the tail pipe.
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For the passenger floor, my original plan was try to re-use the boot lid inner skin, it is roughly the right size & shape and I thought it would save me time. Here' a reminder of what it looked like
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After taking a good look at it, there were 2 main issues:

1. I was going to have to make a lot of modifications to make this work, therefore negating any potential saving of time.
2. With the lateral tubes of the floor support frame, there would be no longitudinal airflow between the heat shield & the floor, to keep the floor cool.

So with the above, I felt my time would be better spent making a new floor, which should look like it was supposed to be there too. After taking a few measurements, I made up a buck from some plywood, hardboard and chipboard. The plan is to have the smooth side underneath as the mounting face & for air flow, with the unfinished side upwards, to match the rest of the tub (or what’s left of it); therefore I could mould straight off the buck.
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All the gaps & edges were filled with silicone sealant, which was cleaned up after the above photo, the counter sunk screws were also skimmed over. I wasn’t too precious about the surface finish of the buck, as no one else will ever see the surface of the moulded part.

After a quick polish and an application of PVA release agent, 1 layer of gel-coat & 2 layers of 300g matting were applied, with a bit of extra matting in a couple of key areas. Then left over night to cure.
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The moulding released quite easily from the buck, the gel coat is grey, all the blue is PVA releasing agent.
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Untrimmed it weighs in at 3kg, which is the same as the boot skin & piece of tunnel next to it, but the new moulding has the mounting features already. The longitudinal rib is for both stiffness & to provide airflow between the floor & the exhaust heat shield.
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Last edited by BigBobPilot on Sun Aug 26, 2018 9:02 pm, edited 1 time in total.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Sun Aug 26, 2018 4:14 pm

A bit of a wash on the moulding to get the PVA off
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Then some marking & trimming, with the floor in & out a few times, here it is on the buck
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and in the car, the black marked rectangle at the back is where the battery is, I’m going to cut an access hatch here.
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and at the passenger door, where some more of the moulding needs to be trimmed, but I need to make the boxing to the new door seal flange, over the top of the tail pipe.
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There is still a gap between front of the floor & the bulkhead, this needed to be a separate piece to allow for assembly, it also needs to be bolt in, to allow the exhaust to be removed. Therefore more parts to be made here. The interface to the tub down the tunnel needs a flange matting on to the tub. Other interfaces need sorting and the fixings fitted, but the bulk of the big hole is now filled.


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by philhoward » Sun Aug 26, 2018 5:27 pm

Lovely work, Ben.


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551 A race oddity

Post by CNHSS1 » Sun Aug 26, 2018 7:05 pm

Blimey Go Faster, that's very pro-fesh-neal 8) 8)


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551 A race oddity

Post by efi_sprintgte » Sun Aug 26, 2018 7:14 pm

Top work mate


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551 A race oddity

Post by BigBobPilot » Sun Aug 26, 2018 9:20 pm

Hmm, the problem with chopping lots of bits off, is that you have to make lots of new bits...


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by barry_bryan » Mon Aug 27, 2018 3:05 pm

excuse the pun, that is really COOL Ben. top marks. Baz


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551 A race oddity

Post by reliant-reviver » Tue Aug 28, 2018 8:27 am

Lovely work, but the integration of a couple of isofix points for a child seat would have really sold it for me.


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551 A race oddity

Post by BigBobPilot » Tue Aug 28, 2018 6:22 pm

reliant-reviver wrote:
Tue Aug 28, 2018 8:27 am
Lovely work, but the integration of a couple of isofix points for a child seat would have really sold it for me.
No passengers in a race car, however small & light they are!


Ben

SS1 CA18DET race car in build
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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