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TurboKraft TurboKraft is offline
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Join Date: Mar 2005
Location: Phoenix, AZ
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TurboKraft makes its own adapters.
We have had to revise the inner bore dimension several times as the K27 castings aren't that precise -- not round, not consistent diameter from one to the next.

Often you have to lightly sand the compressor outlet to fit the adapter onto the turbocharger. We dry fit the adapter, and once it fits well, remove it and install the o-rings. Yes, lots of lube is required to prevent damaging the o-ring. The resulting seal is good as the o-rings are reasonably pliant.

Is this optimal? No, but it allows you to use a stock turbo-to-intercooler charge pipe and have a (mostly) stock compressor housing and removable adapter (ex: if you have to replace the turbo you can reuse the adapter).

We'll frequently forgo the inner o-ring and epoxy an adapter in place. The turbos can usually be rebuilt and if not, the cost of an adapter is minimal relative to the turbo job. When epoxied, they simply don't leak.

If you opt to not use an adapter and instead use a piece of 2" ID silicone hose, I suggest leaving a small retaining ring on the bottom of your charge pipe to help give a positive seal when the clamp is tightened. Hoses don't like to seal on tapered surfaces.

This is what we do when installing one of our Garrett GT35RE turbochargers.

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Chris Carroll
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Old 12-12-2011, 08:48 AM
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