The case reinforcement pieces are placed in a stainless steel pot and liquid nitrogen is poured in.
The ultra-cold liquid nitrogen shrinks the parts. This is so a tight press fit can be obtained between them and the block without excessive force that could distort the case halves.
The supercooled case reinforcement inserts are now ready to be installed.
The super-chilled inserts are installed in order from inside to outside to minimize stress on the cases. The insert is placed on top of the deck. You can tell that this sucker is frosty. I want to try liquid nitrogen to cool my beer!
With the hot case, the cold insert goes right in with a few light taps of a hammer. The insert is hammered down until the insert positively bottoms on on its machined register in the block.
8 comments
Hi Guys,
Love this article – I’ve got one question about the sequence of steps, specifically the CTP Cryogenics treatment step coming in after the torque plate hone/bore. If the tensile strength of the metals are going to be increased would that mean that the same torque rating on the head studs would create less distortion and negate some of the benefits of using a torque plate while machining?
Thanks,
Nick
No.
Our Cryogenic services should come after rough boring, if needed, but before final honing.. Torque ratings should not be altered from specs.. All building techniques should be done to the highest standards not matter what. It is the same as procuring the highest quality parts one can despite sending parts for DCT (deep Cryo Treatment) and other enhancements such as WPC or DLC..etc
As a note, we did not measure any dimensional differences in our cases before and after cryo treating.
Do you notice any differences between the machine work done by Outfront on the video build and and IAG on this one? if so which would you recommend for a Subaru engine build?
They are both high quality jobs but from seeing the process firsthand, IAG has more control over their processes and more state-of-the-art machining centers. IAG also uses deck reinforcements using the same cast metal as the block which is more thermally compatible with the original case. IAG has the 14mm stud option vs 12.5mm. IAG has the receiver groove for O-Rings. These are incremental differences.
What effect , if any does the wpc treatment have on oil retention on the bores?
The dimpled texture probably improves it.