Aston heads roll...

[yeti]

Actually, they're just being machined

Can't wait to see mine in progress like this, Rosie's owner is a lucky fella

BamfordMike said:

Her engine is now removed and lucky too, new internals ready and waiting…



The OEM 4.3L parts replaced for Steel connecting rods, 4.7L pistons and crankshaft. For our build process the engine internals are lightened and balanced, each rod is weighed and the heaviest rod machined down to the lightest rod weight, same for the pistons, each component is weight matched to within 0.1g spread heaviest to lightest. The flywheel and crankshaft damper pulley are balanced and then as one complete assembly the damper pulley, crankshaft and flywheel are spun up at speed on a test rig to be able to dynamically balance the complete assembly. This means the normal lumpy idle quality and general vibes from the engine are eliminated to return silky smooth refinement yet much faster on throttle responsiveness too. The elimination of vibration on pedal box, floor pan, seat frame, steering wheel and door frames (all places parts of the body touch) is noticeable and almost, you can sit in the car and not feel the engine running – and here is the proof – not just the reserve of Rolls Royce engines, but should the right care in manufacture be applied, RR quality is possible anywhere..!

http://www.youtube.com/watch?v=9xfjYRV8O5E

here are clutch and flywheel, and the all important power unleashing Bamford Rose exhaust manifolds and cats waiting for Rosie's rebuild.




Next up, the engine block and internals in build... Build artwork courtesy of Bamord Rose Bruce.


Block newly machined from 4.3L / 86mm displacement / bore to 4.7L / 91mm displacement / bore



Block with crankshaft installed



Block with crank rods and pistons





Now onto the cylinder heads.

For all prior Bamford Rose GT4 racing engine builds which blow the competition out of the water, we have digitised that winning combustion chamber and porting / flow modifications.



This pattern can then be programmed into CNC operation



http://www.youtube.com/watch?v=4E_0xNPCXfc

And then stand back with fingers crossed, and watch the bruiser of a CNC machine follow the pattern..!



http://www.youtube.com/watch?v=8OILN2L6jW4

And after polishing by hand (well, we cant make a craftsman redundant by a machine..!) a cylinder head and combustion chamber ready to breath fire is created..!







Stay tuned for the next update of project Rosie…!

[paddy328]

I love things like this

[George29]

yeti said:

Can't wait to see mine in progress like this

Is yours ever going to get done Lewis? I'm sure you were the first one to go in and it still isn't done!

[yeti]

George29 said:

yeti said:

Can't wait to see mine in progress like this

Is yours ever going to get done Lewis? I'm sure you were the first one to go in and it still isn't done!

They have the block, the heads, the crank and most of the components, it's a true prototype so nothing exists for it and some bits, like head gaskets have been made as one-offs.

But it will come... It wil be 6.5 litres... And it will make 100bhp/litre. The maths are simple

[mikey k]

yeti said:

They have the block, the heads, the crank and most of the components, it's a true prototype so nothing exists for it and some bits, like head gaskets have been made as one-offs.

But it will come... It wil be 6.5 litres... And it will make 100bhp/litre. The maths are simple

It will be worth the wait

[PiloteAM]

Loving the attention to detail

One of the reasons I have such confidence in BR is that they are so open with what they do, describing it in such detail.

[robgt]

Purdey is off for a little fettling quite soon. I shall miss her dreadfully though I am sure the end result will be worth the wait.

[mjk1]

Very impressive, speaking as an RR engine designer!

[Stonic]

Yeti... With all that engine work was there no temptation to add some form of forced induction as well. I'm assuming the internals would take it and it requires a total remap anyway. Would have thought it could get you to 750-800hp without crazy levels of boost.

[mikey k]

Stonic said:

Yeti... With all that engine work was there no temptation to add some form of forced induction as well. I'm assuming the internals would take it and it requires a total remap anyway. Would have thought it could get you to 750-800hp without crazy levels of boost.

Now that's going to open a can of ........
In theory its a good plan

[yeti]

Stonic said:

Yeti... With all that engine work was there no temptation to add some form of forced induction as well. I'm assuming the internals would take it and it requires a total remap anyway. Would have thought it could get you to 750-800hp without crazy levels of boost.

Drivability coupled with my ability would not make that a great idea. 800bhp is unuseable, but 650... yeah, I might squirt tha out every now and again

We toyed with a 7 litre plus conversion which would have required a crank milled from scratch, but otherwise no more cost really. But you're into realms of talent or electronic stability aids that I don't possess for the former and Aston/BR don't possess for the latter. I also would always take natural aspiration over forced induction in the same way as I would take a manual over a robotic system any day. Brute force is always better when deployed in the traditional fashion

650+bhp in a DB9 Volante should be OK really

Edited by yeti on Wednesday 15th May 20:20