551 A race oddity

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rkclodhopper
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551 A race oddity

Post by rkclodhopper » Tue May 29, 2018 10:49 am

Looking good Ben, coming along nicely.
It will be interesting to see how effective your bonnet venting is, certainly the rectangular outlet will be good, it certainly works well on Nicks car. Previously at high speed the front edge of the bonnet would lift, possibly due to a bit of higher pressure under it but certainly a low pressure area above it, whichever it doesn't lift now and the intercooler has a good flow through it. Im'e not sure your NACA duct will work where it is though, its in the same low pressure zone as the big hole so the flow might be the reverse to what you want.

Richard



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551 A race oddity

Post by CNHSS1 » Tue May 29, 2018 11:15 am

Re the IC outlet hole, a vertical gurney lip will help the extraction too, only 5mm ish high, across leading edge and sides, 'trips ' the flow over the aperture so none can try and enter and helps venturi effect. Looking mega by the way 8) will get over when I'm back mate with mould :)


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BigBobPilot
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551 A race oddity

Post by BigBobPilot » Tue May 29, 2018 6:26 pm

reliant-reviver wrote:
Tue May 29, 2018 8:02 am
Out of interest where did you source your vinyl from? Eldest bro has nearly finished wrapping his new car bit I was surprised by how much the vinyl cost and he said it was difficult to source from companies as a private individual. Might just be fancy vinyl though.

The vinyl wrap was from here:

http://www.mdpsupplies.co.uk/vehiclewrapping.asp


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 » Tue May 29, 2018 6:37 pm

rkclodhopper wrote:
Tue May 29, 2018 10:49 am
Im'e not sure your NACA duct will work where it is though, its in the same low pressure zone as the big hole so the flow might be the reverse to what you want.
The rectangular hole is only the I/C outlet, it will be ducted to the I/C and sealed around the bonnet. I was planning to add a gurney flap on the front of the aperture as Craig mentioned, but I haven't decided if it will be attached to the bonnet or the ducting yet. The airflow throught the coolant radiator & oil cooler will have other outlets; the raised passenger floor & the tansmission tunnel being the major ones, as they will both have outlets at the back of the car, where the air pressure will be low, to help draw the air through.

The NACA duct is an inlet for the turbo cooling, so will be ducted as such, there will be no airflow connection between the I/C outlet & the NACA duct under the bonnet, extending the I/C gurney around the sides of the I/C outlet will help ensure there is no connection between them above the bonnet, but the airflow direction would probably be enough anyway. Once the ducting / boxing around the turbo is place the main air flow route will be in the NACA duct, past the turbo & out the louvres.

I just haven't made all the ducting under the bonnet yet.


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 Jun 10, 2018 12:43 pm

The SS1 now has a drivers footwell / floor again.
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I’ve made this in steel, to afford my feet greater protection if / when I run over a kerbing or anything else at a race track if I come off the tarmac. I’ll be fitting a flat floor to the car anyway, but the whole drivers side is now steel, level with the bottom of the chassis. The section under the seat is welded in, but the front section is bolted. It will need some tags on the bottom, so the forward section of the flat floor can be bolted to it, then I need to take it out for painting, & make a decent (waterproof) interface to the original tub at the front edge. The rest will be sealed with silicone to the chassis along the sides & rear edges.

Next up was a new seal edge for the passenger door. This is a 90 degree flange bolted to the chassis. Unfortunately I need to take the door bar out to fit the upper riv-nuts.
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I’ve put a bit a door seal on to show the idea.
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There is a corresponding modification on the passenger door inner
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Although looking at the picture of the door, I may have blundered with the position of the flange... I should have looked at the door when I made the flange, rather than rely on memory!


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 Jul 14, 2018 10:46 pm

Hasn't it been hot! Not conducive to working on cars, even when the year is sliding by & I’m still yet to hit a race track with this thing. I been favouring enjoying a shady spot in the garden with a cold cider.

However, today it was on to un-doing some previous work. I mentioned that before taking the car to the rolling road, I tried fitting the rear wings, but the inner wheel arches were hitting the spring dampers. This is all my own stupid fault, I’d fitted up the inner wheel arches when the cars had 1” box section steel in place of the spring dampers, to maintain a fixed ride height. I had the car set low, so that I could modify the arch to allow the 10” wide wheel to pass it. However, the inner arch was too far inboard & tipped inboard, so hit the springs.

I’ve cut the inner wheel arches in half again (front to back), and mounted the inner portion to the car, making a new bracket that holds the arch to the tub.
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It's bolted from the outside at the moment, but I'm going to reverse the bolts so that they are fitted from inside the tub, so that I can take the wing & inner arch off as an assembly, without having to split them. I need to re-think the brackets to hold the rear of the wheel arch to the chassis too, some simple folded ali brackets should do the trick. The inner arches are helping to hold the wing out far enough so that they clear the tyres, fo there's a bit of compression going on.

The outer section was bolted to the wing, then offered up. I’ve now got the two halves tagged together ready for glassing up (again). A job for tomorrow.

The suspension now moves through its articulation and runs past the wing (just), it all seems pretty solid, but some of the filler on the top of the wing (where its spaced out) has cracked & raised up, so I need to flat it off & re-lacquer those areas.
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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 BigBobPilot » Sun Jul 15, 2018 10:03 pm

I had all the rear end body work all bolted up with the mandatory inconsistent & large panel gaps.
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All back off again now though, so I can mat the 2 halves of inner wheel arch back together again.

A few other odds & ends sorted too.


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 MikeyBikey » Sun Jul 15, 2018 10:18 pm

BigBobPilot wrote:
Sun Jul 15, 2018 10:03 pm
I had all the rear end body work all bolted up with the mandatory inconsistent & large panel gaps.


reminds me of my austin rover montego...

:lol: :lol:


Is we sideways yet...

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551 A race oddity

Post by nickkeyser » Mon Jul 16, 2018 2:10 pm

Looking good! Is the rear bumper on two aero catches?



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551 A race oddity

Post by BigBobPilot » Mon Jul 16, 2018 4:48 pm

nickkeyser wrote:
Mon Jul 16, 2018 2:10 pm
Looking good! Is the rear bumper on two aero catches?
No, it's screwed on with riv-nuts added to the rear armature for a bit more stability. The bonnet pin at thr back are just for the boot lid.


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 » Mon Jul 23, 2018 11:47 pm

After some distractions on my coupe, I got back to the SS1 again this weekend. The rear wheel arches are matted up again, after having to undo my previous mod, due to a blunder on the spring damper clearances.
IMG-20180722-WA0000.jpeg
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The photo was stage 2 of the matting, I did the top first, with the two halves tagged together. Then the under side. It shows the amount ot the lip cut-away for tyre clearance too. There was a little matting job on the tub to do too. I had to work quickly with the resin, as even with a reduced amount of catalyst for the ambient temperature, the resin was going off quickly in the heat.

There were a few little brackets to make to add to the passenger floor support (for heat shield & floor fixings) & the drivers side foot-well (for flat floor mounting). With a little production line done, they were welded in. and a bit of painting done, I’m lacking photos here, so there’ll have to be a catch-up. However, most of the heat shield over the exhaust is in place, although I needed some bigger washers for the heat shield material, which were bought today along with some other supplies on short round trip this evening.

I needed to get the passenger door mounted, and it seemed to take an inordinate amount of time trying to get it to clear the trailing edge of the front wing whilst still vaguely lining up with everything else. Lots of on & off, and folks will look at it and comment on crap shut lines! Followed by working out what I want to do with chopping the corner of the door away where the exhaust pokes through. It will be re-created & re-formed in aluminium sheet across the corner, to avoid burning GRP. But I want it to work with the heat shielding on the chassis (as opposed to the door) so that heat & fumes are not coming in to the car.

My revised flange for the re-routed door seal (over the top of the exhaust) also needed some modification & then thinking about how the whole passenger floor will fit in around this area. There’s a bit of structural support required to mount the plumbed in fire extinguisher, which will also act as another mount for the raised floor. I think I’m clear on what I want now, so that it will also be out the way of future rear suspension mods; so there’s more fabrication & GRP work to come to make a sealed cockpit again.


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 » Tue Jul 24, 2018 9:29 pm

The new washers are now swapped in on my heat shield. I've left it over-long at the back until I work out how much is needed around the exhaust tail pipe.
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A bit prep then painting done
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Then I started making some card templates for bits of GRP & aluminium.


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 » Mon Aug 06, 2018 9:35 pm

A bit more done on the SS1 over the weekend:

Rear wings all reassembled & fitted, with supports to tub / chassis, with clearance to the spring dampers this time...
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5mm spacers between body support tubes & wings (red bits)
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Which gives plenty of space for the wheel to move in to bump
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The drivers door is back on & re-adjusted, as I’d had to remove the hinges after last fitting it. This also included having to make up a couple of spacers to get the swing clearance to the front wing.

The holes in the floor on the drivers side are filled, with an aluminium plate at the rear
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and a little GRP matting required at the front of the new steel floor, before both that & the rear panel get sealed in place, & seal around the tub to the chassis.
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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 BigBobPilot » Mon Aug 06, 2018 9:48 pm

I’ve made a mounting for the fire extinguisher, which also doubles up as a rear mounting for the new passenger side floor (which will be at the same level as the tunnel). It’s just tacked together for trial fitting, which is good, as it needs a little adjustment to get it to fit properly at the tunnel end. You can see it's too high at the tunnel, it did fit perfectly before I added the folded sheet bracket to the tube. I may need to add a mount on for the heat shielding over the exhaust tail pipe too, where it runs out the door.
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And with the fire extinguisher in place, pretty much opposite the drivers seat (along with the battery) to help balance the weight of the car.
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I ended up cutting off the original piece of tub GRP that ran down the tunnel top. I decided trying to use the inner skin from the boot lid as a floor section was going to take too much modification to fit; it was supposed to save me time, but I thought it would be easier to make new & run it straight over the top of the tunnel as an easy mounting point. It should also look tidier & I can incorporate a couple of features to aid air flow over the top of the heat shield to help keep heat off the floor & out of the cabin, whilst stiffening it at the same time.

There's a card template for the cover over the diff access hole (there's not much of this tub left!)
Last edited by BigBobPilot on Wed Aug 08, 2018 9:10 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 efi_sprintgte » Wed Aug 08, 2018 8:12 pm

Who needs tubs any way :D


JC

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