SHS Cylinder Head — Version 2 and 3, O-Ring Sealed
SHS Cylinder Head — Version 2 and 3, O-Ring Sealed
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DETAILS
DETAILS
- description
The cylinder head is the face the nozzle seals against, so a tired one leaks air the rest of the gearbox has already done the work to compress.
Leaks here are easy to miss because nothing sounds wrong. The symptom is inconsistent readings over a chrono rather than an obvious failure, which is why it tends to get replaced last instead of first.
Fitting one is also the moment to look at the nozzle, since the two seal against each other and wear as a pair.
Specifications
| Specification | Detail |
|---|---|
| Type | Cylinder head |
| Material | CNC machined aluminium |
| Fits | Version 2 and Version 3 gearboxes |
| Seal | O-ring sealed |
| Sold as | Single cylinder head |
Good to know before you buy
Worth changing whenever the gearbox is already open. It is cheap next to the job of getting back in there.
Frequently asked questions
How do I know the old one has gone?
Inconsistent chrono readings with no other obvious cause are the usual sign. A visibly flattened or hardened o-ring is a giveaway.
Does it fit both Version 2 and Version 3?
Yes, the manufacturer lists both. Check it seats squarely in the cylinder before closing the shell.
Should I change the nozzle at the same time?
It is worth it. The nozzle and cylinder head seal against each other, so a worn nozzle undoes a new head.