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what was wrong with the VH45 infinity engine?
nothing is wrong with it at all! it's a fantastic engine but the vee is a little flatter than the 1UZFE - hence making it wider in the block. not that this is a problem, but the heads are also MASSIVE due to the std DOHC timing belt arrangement per bank- this combined with the extra block width and flatter vee make it physically too wide to fit between my chassis rails and leave enough room for an exhaust. the 1UZFE has a centre cam gear arrangement which means the timing belt only has to drive one cam, with the centre gear driving the other.
as it is, the 1UZFE is a tight fit !
and yes, i think cryogenics is a definite improvement over heat treating - mainly due to the fact there are no warping issues whatsoever, because it compresses the 'slag' created from the casting process into malactite (it sounds like that anyways - i know it starts with 'm') which is 4x stronger.
anyone who thinks the deep freeze is a gimmick should have a look at why the metals on the space shuttle are stronger after being in space than when they left earth - and although re-entry heat is around 700