17.
17.CRS.
16.
16.S
Valve Installation Instructions
ProX Titanium Engine Valves are manufactured to the highest quality standards and specifications. By using the latest state of the art Titanium material and coating, the valves have improved properties over the original item. We would like to support you to achieve maximum durability. Titanium is a very exotic material which requires you to work after following installation instructions.
1mm
o
45
Installation instruction
1. Do not touch the valve surface with your bare hands, use gloves or pre lube the valve with engine oil, these precautionary measures will reduce the risk of corroding the coating. 2. Never use a lapping compound on a new valve, take a dummy valve to do this grinding operation. 3. Please take notice; during every rebuild the valve seats must be machined, this to assure a 100 % valve to seat contact and making the seat free from the hardened shell. The width of the contact zone on a valve seat with the valve face should be at least 1mm. In general the angle is 45°, however consult the O.E.M. specification first. 4. New valve seats should be soft, material as Nodular Iron, Bronze, or Beryllium-Copper, all heat treated to Rockwell, RC32 or less. Most of the original valve seats used in combination with titanium valves are made of such an alloy. Attention : After every rebuild the seat is getting thinner which makes the heat transfer worse, increasing the natural hardening process. The back set position of the valve (Recess) after every time one machines the valve seat, worsening the engine’s breathing. Besides of reducing the engine’s efficiency this also effects the cooling down effect negatively. 5. Use only original valve springs or ones with forces not exceeding the originals.
NOTES
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