The parameter while of course not the only one is important because the narrow space in PSA engine limits the size of valves.
The reason why they stay with it is simple - they don't have any other choice.
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The intake, exhaust, turbo, cooling etc. are replaceable parts, it could be optimized as needed, but engine block is main part, part where you start. if you get "wrong" block, you can optimize it whatever you want - it still be worse engine. Also decisions can be wrong.
Ryan Champion
The @vwrallytheworld R5 Polo testing today past the @BelowZeroIce lake in the hands of @GronholmM...
It will be a while until KMS gets their hands on a Polo R5.
https://translate.google.com/transla...r-p-rally.html
Petter Solberg RX
Well that was a fun Friday! It was fantastic to be back behind the wheel of a rally car and working with @volkswagenms on the new Polo R5 today
Any videos of Petter testing?
Edit: forund a short one https://www.facebook.com/PetterSolbe...6359397572922/
Who was in the right seat?
edit: Veronica Engan.
guess we will see the testcar on ewrc next week.
Interview about Proton Iriz R5 :
https://www.lemagsportauto.com/rally...iriz-r5/29570/