Starting with an open chamber U67 L20B casting - it doesn't really matter which head I started with as long as it is a big port one, you'll see why in a sec.
Aiming to make a really, really powerful 2L datto:
Got it all stripped down, seat inserts & guides out back to a bare alloy casting, then out with the TIG welder & spend a couple of hours making rods disappear:
Snip some time while I straighten out the head (bent about 1.5mm from all the welding), then on to the mill, rough the welds down to .040" from the original face & then peen the bejesus out of the welds to compact & work harden the softer welds:
Mill it down to a clean surface:
Top face gets a light skim to get it nice & flat:
Same goes for manifold face:
That's that bit done:
Now I've got a clean slate casting to play with, I'll be putting in my own design combustion chambers & doing some other stuff as well, I'll post some pics as I go.
Aiming to make a really, really powerful 2L datto:
Got it all stripped down, seat inserts & guides out back to a bare alloy casting, then out with the TIG welder & spend a couple of hours making rods disappear:
Snip some time while I straighten out the head (bent about 1.5mm from all the welding), then on to the mill, rough the welds down to .040" from the original face & then peen the bejesus out of the welds to compact & work harden the softer welds:
Mill it down to a clean surface:
Top face gets a light skim to get it nice & flat:
Same goes for manifold face:
That's that bit done:
Now I've got a clean slate casting to play with, I'll be putting in my own design combustion chambers & doing some other stuff as well, I'll post some pics as I go.
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