VHM

De Vlonder 208
5427 DH Boekel
The Netherlands

Tel. +31(0) 492 32 45 95

info@vhm.nl

Cylinder head volume measuring of VHM
Volume measuring

Manual cylinder head volume measuring

This manual describes how to measure volume of a combustion chamber.

  1. Remove cylinder head from cylinder and make sure that piston and combustion chamber is clean.
  2. Check correct piston height. In this example the piston height is -0.5 mm. This means that top of the piston is 0.5 mm below the cylinder deck, when piston is at top dead centre.
  3. Mount cylinder head on cylinder and tighten bolts.
  4. Move piston at top dead centre (TDC).
  1. Fill pipet with liquid to 0 ml level.
  2. When liquid is in pipet, it has a curve at the top. Liquid level is determined by reading bottom level of the curve.





  1. Fill combustion chamber with liquid till top of the spark plug hole.
  2. It forms a meniscus or curvature.






  1. If meniscus is concave, or pointing downward, then bottom of meniscus is below top of the spark plug hole. This is not correct, adjust fluid level with more liquid.
  2. Here you can see that liquid is below top of the spark plug hole. This is not correct.



  1. Here you can see that liquid is leaking over the top of the spark plug hole. This is not correct. Use a pipet to draw some liquid out.







  1. The correct level of liquid is when there is a convex meniscus, or upward pointing meniscus. Liquid is a little bit curved over the top of the spark plug hole.
  2. Here you can see that liquid is a little bit over the top of the spark plug hole. This is correct.




  1. Now you can read volume on the pipet graduation. Measured volume is 11.40 ml = 11.40 cc with a piston height -0.5 mm.

    Measured volume of 11.40 cc is not the volume of combustion chamber.
  2. Measured volume is volume of combustion chamber including volume of the spark plug hole.
  3. Volume given for all VHM inserts is volume of combustion chamber including volume of the spark plug hole.


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VHM

De Vlonder 208
5427 DH Boekel
The Netherlands
CC (KvK): 16076527
Tel. +31(0) 492 32 45 95
Fax +31(0) 492 32 20 84
info@vhm.nl
www.vhm.nl