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latest update: my builder found a tiny crack in one of the valve guides. So he's moving onto a spare head. I couldn't see the damned crack, but its there - shine really bright light and squint hard, and there it is. Who knows how long its been there, or how it'd affect things in the long run, but well, there you go. Ask for detail, and you get it, but this build is DRAGGING on and on!
He wasn't happy about the crank clearances on #2 and #3 (he felt there were too tight and he wants exactly .038mm oil clearances, so the block cradles were shaved some ridiculously small amount on those, and now he's happy.
I dropped off a Trust twincore radiator and an HKS Racing BOV (the SSQV leaks over 1.8bar unless you connect the vacuum hose to the throttle bodies instead of the balance pipe (but then the valve doesn't really ever open, causing surge).
New piston wrist pins were fabricated and weigh about 5g apiece more than the HKS pins that had runout. Can't have everything I suppose.
We had a discussion about the squish pads. He wasn't keen on removing them for an interesting reason I hadn't heard before - on top of the lower C/R, he said exhaust gas velocity would go down (and we want fast exhaust gases to spool them turbos!). I guess that's why on the Z-Tune only the intake pads are removed.
Another two weeks...at least.
If anyone wants a head with FULL port work (but one cracked valve guide), PM me.
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