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12G940 Porting

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#1 Schaf_1

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Posted 27 July 2020 - 07:29 PM

Any opinions about this porting?
It is okay?
Will it give a boost on performance?
Bigger intlet vales will be added.
https://share-your-p....com/4747dff81c

#2 nicklouse

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Posted 27 July 2020 - 07:31 PM

Any opinions about this porting?
It is okay?
Will it give a boost on performance?
Bigger intlet vales will be added.
https://share-your-p....com/4747dff81c

where? needs much work doing before it is even used.



#3 mini13

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Posted 30 July 2020 - 07:19 AM

well,

 

I assume thats the centre two exhaust ports from the seat pitting, cetranly the seats will need to be re cut to make the head usable. really we need more pics of the head, but mainly the most import place to pay attention to is the valve seat and lead into it (throat). another easy improvement is to back cut the valves to match the seats.

 

I m no expert, but I know enough to know its easier to send the head to turbophil than bother trying to do it myself!



#4 MiniMadRacer

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Posted 31 July 2020 - 06:11 PM

I tend to agree, we all "tried" porting and polishing back in the day to gain a few horses over our competitors, and probably through more luck than judgement we may have succeeded. Today with heads no longer a throw away commodity picked up for £5.00, and porting now an established art, I would leave it to the experts..//as a racer we went for out and out power not giving a monkeys to driveabilty or fuel consumption... those days are well and truly over.. 



#5 MiniMadRacer

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Posted 31 July 2020 - 06:15 PM

As a bit of a side issue.. where you can spend time and add value is careful measuring of clearances on the build... to me thats not an art its an exact science.. a clearance is either 3 thou as required or its not 3 thou...so I would spend my time on getting that side correct and letting the experts do the bit I "cant" do



#6 rock1day

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Posted Today, 06:32 PM

I think your work is pretty good but having guides, 3 angle seats, skimming and unleaded inserts fitted will cost a fair bit though.

 

Try Peter Burgess in Derbyshire, his work is good and reasonably priced  







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