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? for the engine gurus............. (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by jim in sd on August 05, 2001 at 20:22:24:

creative thinking once again,...in the past i've built several very high output v-8s using basic hotrod technology...ie, pocket porting,unshrouding the valves, increased valve size,.increased cam lift and duration...compression etc....
point being.........i've picked up a spare 3.5 head that i'm currently doing valve pocket cleanup on,..2mm larger valves on intake and exhaust,..e34 535 cam,gasket matching intake ports....
on the v-8s it was common to surface the head, along with new pistons for increased compression. if memory serves me right....for every 10 thousands removed from the heads surface there was almost a 1/2 point increase in compression.
if.......i were to mill a sufficient amount of material from the head to bring compression up to say 9/9.5 to 1....would it be possible to regain the proper cam relationship (timing) by use of an adjustable cam sprocket..?

input from the gurus would be greatly appreciated...!!!!!


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