Yes Maurizio, initially I will use the existing Motronic to avoid surprises and will remap after break-in (or earlier if its intractable). Mats, I really don't have a problem with the std 75 type of injectors. I use correct fuel hose so no clamps are needed (
that would look shitty!) I do have two 24v fuel rails+injectors but I want to use the 75 rails on this one (never had a problem with this setup).
Ahhhh! Today the valve spring issue was
solved...I ended up using the Arricambi outer springs with...VW Golf 16v inner ones!! Seat pressure will be fixed at ~90lbs with 32.5mm installed height, which gives ~174lbs at 10mm valve lift and ~190lbs at 11.5mm. This makes for excellent high rpm capability with the lighter valvetrain parts.With this solution, no spring base machining is needed
![Wink :wink:](./images/smilies/icon_wink.gif)
What you'll see in the book though is a spring length/force diagram, std and modified. If you use similar lighter parts (valves and lightened exhaust followers-34gr from 49gr)you can use the std springs for much higher rpm. However you would have to limit valve lift to less than ~10.5mm. Speaking of weights, std 3liter valves weigh 110/82gr and mine are 89/73gr. If only the std springs had more travel!
Now for the hard part, settling on the best possible cam profile. One that idles like clockwork at 800rpm, is streetable and hauls a$$ to 7800! (Emissions, say what
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
)If I finally go for 115* lobe centers in/ex, HC should be very reasonable. After I decide on it, it'll take two weeks to get the finished item (Germany or Italy). Thats when I button up!
Watch this space for more boring details!
Jim K.