CNC Engineered Gas Flowed Cylinder head

[allanr5gtt]

hi there just seen this advert on ebay.
what is the your point of view on using a cnc to porting the head?
how is porting the head done normally?
what do you think of the flow chart?

thanks allan

http://cgi.ebay.co.uk/Renault-Clio-1...item414e789f91

[JohnAldridge101]

CNC in my opinion is the better way to to it, the old fashioned way was done by hand using a die grinder, the beauty of CNC is that all the ports will be matched exactly giving (possible) exact power outputs on each cylinder, and if your developing several heads together it is far quicker and easier let a machine do the hard work and to 0.005mm accuracy.

http://www.youtube.com/watch?v=kcERvWYUNUw

[Ashy]

I tell you what they must have some good kit to achieve those tollerances!

I wish I knew how to operate a 5-axis CNC's I'd be in work all weekend making bits!

[Andrew Cooke]

I tell you what they must have some good kit to achieve those tollerances!

I wish I knew how to operate a 5-axis CNC's I'd be in work all weekend making bits!

and for only an extra £100 they'll make it even better by finishing it by hand....

[Scoff]

When I saw "Andrew Cooke" as last poster I clicked on this thread knowing I'd be rewarded either by something incredibly factual or something comically summarizing

[Bunje]

if we had five axis where i work i think i would be there every weekend maching any thing and everything aswell. unfortunatly we only have 3 axis comes in quite handy for some bits tho

[JohnAldridge101]

and for only an extra £100 they'll make it even better by finishing it by hand....

i dont get it

[JohnAldridge101]

I tell you what they must have some good kit to achieve those tollerances!

I wish I knew how to operate a 5-axis CNC's I'd be in work all weekend making bits!

the bridgeport i use at work has .0001" increments (.0025mm) quality bit of kit but only 3 axis

[Scoff]

i dont get it

RTOC sense of humour

It's Ric wood motorsport so there should be no doubt it'll be a nice job.

[Ashy]

the bridgeport i use at work has .0001" increments (.0025mm) quality bit of kit but only 3 axis

We just spent £500k on a Mazak u8800 which will achieve positional (& repeat) accuracy of 7microns! I doubt you will get anywhere near 2.5microns (tenth of a thou) on a Bridgeport! maybe your decimal place in in the wrong place?

[allanr5gtt]

hi all just stripping a engine in the garage and took off the manifolds and it looks like and head had some work done to it or is this how they came std from the factory?

https://www.rtoc.org/boards/album.php...pictureid=6608

[allanr5gtt]

https://www.rtoc.org/boards/album.php?albumid=963

as its not a cast finish? it looks like it's been manchine at some point?

[p30esteves]

I ve bought a f4r engine in uk and the engine head has the same finish as yours, it looks the same as yours.

[Adey aka Ewok]

thats what f4r heads look like