Ne znam gde mi je njegova knjiga, ali Ljube ce videti da uslika posto je napravio kopiju.
Za sada nesto sto sam nasao online - ovde se prica o kompletnim std Jetronic motorima:
The 2,5liter has very good size valves, much larger proportionately than the 3liter. If you want something to improve, clean up the ports (not enlarge) increase compression ratio to the max compatible with the best commonly available fuel in your area (by shaving the heads), install the QV cams and a good free flow exhaust system, tailor the advance curve to what the engine wants and away you go. If all this proves too little for you, find a 3liter and do the same things. I don't know which solution is cheaper,but I strongly suggest you rebuild the engine and balance everything on your way to higher power-this way it will live longer and make more power!
Jim K.
3liter stock ports are 35mm. If you can have 40mm runners do it. Then, you can take the ports to ~36-37mm with std valves.
Hmmm, moguce je da sam malo pobrkao loncice vezano za glave jer vidim da je naveo kako je 2.5 glava bolje efikasnosti, ali za datu zapreminu motora sto ne znaci i da je boje resenje od 3.0 glave za 3.0 blok. U svakom slucaju, cekamo da Ljube iskopa onaj deo sa slikama...
Evo i njegovog crteza sa GTV6 foruma za prosirivanje kanala na 3.0 glavi za 46mm ventile.
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