Cosworth YB Turbo Into Elan

[stevebroad]

Steve,
All looking good. Are you using the effect of the air coming off to rear to suck hot air out of engine bay?

Bearing in mind that we don't have a wind tunnel:

The mid bonnet vent is located in the low pressure area thereby allowing the higher pressure under bonnet air to exit. This air is directed towards the top of the screen so avoiding a high pressure build up at the bottom of the screen. Reducing the pressure at the bottom of the screen allows the rear bonnet vent (which is also aimed at the top of the screen) to work more efficiently.

Once the car is running I will do a tuft test to see if this actually works

[pauljones]

I see. Sounds good.
Was just curious to be honest.
Loving the progress and thought train. Loads of little ideas coming together nicely.

[stevebroad]

Steering wheel innards:

[pauljones]

14 years in the making Steve, and all you got is a steering wheel!!

Damm good looking wheel mind you. Fully functional too.

[gav]

Steve

That's nuts - which one is the ejector seat?

Gavin

[pauljones]

BRMO

Big Red Middle One

[stevebroad]

Steve

That's nuts - which one is the ejector seat?

Gavin

Picked this beauty up but it is rather too heavy (the chair, that is )

[stevebroad]

14 years in the making Steve, and all you got is a steering wheel!!

Damm good looking wheel mind you. Fully functional too.

Thanks

I have also got a switch panel.

And a glove box door

[stevebroad]

Since my last post a lot has happened. The wring is almost complete, which is a big deal, and bloody expensive!

Also, I decided that engine and suspension access was restricted so I designed and fabricated a flip front out of prepreg carbon. The mould had some issues under vacuum and heat so a fair bit of repair was needed to the bonnet, hence the tattiness of it bit this will be dealt with in due course.

[gav]

Blimey I thought I was making progress - but this is great

Must have been a huge mould to do all of that in one go. Despite your trouble, it looks really good

Which way does the air go into your rad? From the top down or the bottom up?

Cheers
Gavin

[stevebroad]

Hi Gav

My problem is that I keep thinking of new stuff to do

Mould is in 4 pieces.

Bolted together, joint lines filled.

Carbon laid in mould.

Bagged up.

Cured.

The problem was caused by the foam filled reinforcement ribs on the bonnet area. With a vacuum pressing on both sides of the mould the ribs formed a barrier so the the uneven pressure caused the mould to deform along the reinforcement lines! The really annoying thing is that they weren't even needed

[nmauduit]

The problem was caused by the foam filled reinforcement ribs on the bonnet area. With a vacuum pressing on both sides of the mould the ribs formed a barrier so the the uneven pressure caused the mould to deform along the reinforcement lines! The really annoying thing is that they weren't even needed

did you cured in all in one step or did you add the reinforcement after the outside is cured ? or could it be that the plastic was too tight around the reinforcements?

awsome in any case... probably not noticeable at speed, and it may even have unexpected effect on drag (like for golf balls...)

[stevebroad]

The problem was caused by the foam filled reinforcement ribs on the bonnet area. With a vacuum pressing on both sides of the mould the ribs formed a barrier so the the uneven pressure caused the mould to deform along the reinforcement lines! The really annoying thing is that they weren't even needed

did you cured in all in one step or did you add the reinforcement after the outside is cured ? or could it be that the plastic was too tight around the reinforcements?

awsome in any case... probably not noticeable at speed, and it may even have unexpected effect on drag (like for golf balls...)

The mould was air cured. If I had then post cured it in the oven without vacuum it may have fared better. However, with a pressure differential of around 14.5psi I am not really surprised that 4 layers of fibreglass distorted. The mould is made from 6 layers, but 2 are over the reinforcement, another mistake. Oh, well, live and learn.

Looked horrible so I am in the process of smoothing them out.

[nmauduit]

Oh, well, live and learn.

yes, thank you for sharing, I would not have thought such an effect to be noticeable...

[stevebroad]

Oh, well, live and learn.

yes, thank you for sharing, I would not have thought such an effect to be noticeable...

The deformation was over 5mm high and 50mm wide, so quite noticeable.