Emulsifiable grinding oil for engine head resurfacing

Emulsifiable grinding oil for engine head resurfacing

The importance of emulsifiable grinding oil during engine head resurfacing

When we talk about engine head resurfacing, with a grinding wheel or abrasive sector, one of the aspects that most affect the quality of the finish is definitely the emulsifiable grinding oil used during this process.

Surely often we pay extreme attention to the abrasive grain, to the revitalization of the sector or of the wheel, to the speed of rotation and advancement, but a few times the importance of emulsion fluid is taken into account.

Therefore, speaking of refrigerant during the flattening of the heads, the aspects we have to take into account are mainly 3:

  1. Mixing ratio of water/emulsifiable grinding oil
  2. Output jet inclination
  3. Output pressure of grinding coolant
A used resurfacing machine is grinding an aluminum engine head
A Comec RP900 resurfacing machine is grinding an aluminum engine head

Mixing ratio water/emulsifiable grinding oil

To obtain maximum performances during the adjustment of the engine head, the emulsifiable grinding oil should be mixed in the correct proportions.

Normally, the theory provides a mix of water/emulsifiable grinding oil in a ratio from 4 to 9%.

However, at The Ultimate Tooling we recommend that you carefully follow the instructions given by the emulsifier manufacturer for an optimal blend.

Output jet inclination

Another particular consideration is the output jet inclinationthat the nuzzle must have when spraying the emulsifiable grinding oil on the grinding wheel.

Always referring to the theoretical advises, the correct inclination that the nozzle should have to reach the best achievable result is 20° with compared to the tangent of the grinding wheel.

The right inclination of the grinding coolant jet compared to the tangent of the grinding wheel should be about 20°
The right inclination of the grinding coolant jet compared to the tangent of the grinding wheel should be about 20°

Output pressure of grinding coolant

Lastly, but not less important, is the output pressure of the emulsifiable grinding oil.

The output pressure of the emulsifiable grinding oil mostly determines the flow rate of the grinding coolant.

We can translate the output pressure into the amount of emulsifiable grinding oil that will be into into the grinding wheel during the process.

This aspect significantly affects the temperature produced during resurfacing.

The grinding coolant speed is correct, only when the output pressure is approximately equal to the peripheral rotation speed of the grinding wheel.

Let’s try to refer to the data shown in the table below, where VM will be the peripheral rotation speed of the grinding wheel, while PK will be the output pressure of the grinding coolant:

VM (m/s)
PK Correct
PK Minimum
10 m/s
1 bar
0,6 bar
20 m/s
2 bar
1,2 bar
30 m/s
5 bar
3,2 bar
40 m/s
8 bar
4,8 bar
50 m/s
13 bar
7,8 bar
60 m/s
19 bar
11,4 bar

Advantages of the emulsifiable grinding oil

The advantage of an optimum mix of emulsifiable grinding oil could be resume into the following points:

  • Increased material removal
  • Improved surface finish
  • Reduced risk of burnt spots
  • Longer life of grinding wheel or abrasive sector

Final considerations

It should be specified that in some cases, as in the situation of tangential grinding machines, lot of people prefer to use pure and unmixed grinding grinding oil.

However, we want to point out that into engine repair, tangential grinding is mostly rare.

Also, we would like to clarify that we always suggest to use emulsion liquids from the best brands.

This will allow you to get the best performances of your resurfacing and to maximize the benefits listed above.

Tangential grinding machine
Tangential grinding machine

Conclusions

We hope we have gave you useful information, and we encourage you to share this article on social networks, using the relevant buttons below and we wait your comments that you can freely express in the comment section or contact us directly using the button below.

Recommended Posts