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already sent by (output started at [ROOT]/includes/functions.php:3887) RS Motorsport :: Classic Speed Restored • View topic - Pinto CNC head ?
Part No: CNCA2 Status: Special Order Only. Item Price: £761.70 Surcharge: £100.00 Price: £861.70 £1,012.50 (exc.Vat) (inc.Vat)
Description: CNC HEAD ASSEMBLY 2.0 PINTO RACE
Other Info: BUILT WITH 44.5mm INLET VALVES AND 36.2mm EXHAUST VALVES. UNLEADED VALVE SEATS ALSO FITTED. MACHINED ON CARB HEADS. PRICED ON AN EXCHANGE BASIS. 48cc IN COMBUSTION CHAMBER
Hi
Really enjoy this forum and thought it was time i contributed
The poms dont know it all !!!!!!!!!!!!!!!!!!!!!
The following pics are of the"prototype/ pratice" CNC head we did here in
Melbourne
After many many hours we developed a progam to cut the shapes shown
This head is ruined but it was the means to actually getting it right
We have done 4 more with a little beter welding job and a program that got rid of all the lumps and bumps shown
One of these heads is having some serious porting done including raising the inlet port about 10 mm and flow benched evetually to go on a mk2 rally car ,another got droped and busted a busted a cam tower (fixable)
The other 2 i am doing a more conventioal job on and i will use on my motor
The photos of the exhaust ports are shapes we are mucking about with that can be CNC machined for 25mm or so in from the maniflod face,the programming for this is still a work in progress
This was done on a 3 axis machining centre and the good heads took just over an hour each to do once we got it right
I can not take credit for the shape, it is comination of Esslinger in the States, David Vizzard in the UK, and Rob Baker here in Melbourne
If anybody is still slightly interested i will post some pics of a finished head
No flow figures yet as there is not a finised head, the first 1
that will be flow benched is the raised inlet port jobbie
The style and quality of the porting , valves, seats, guides and any other variables you can think will inflence this so whatever this head flows will not directly relate to any other head
This shape should offer other benifits as well as impoved flow around the valves
Re the size of the chambers no two heads are the same as the final program
only just cleans up the chamber roof unlike the the one in the photos
which has had .120" taken of the face and the roof raised maybe .060"
while we adjusted the shape and the pitching and mucked about
Depending upon the thickness of the head they are 38-40 cc's ( smaller)