20 replies to this topic

[Cooperman]

Remember, you will be measuring in mm, but calculating the volumes in cc. There are 10 mm to 1 cm, so 100 cubic mm's = 1 cc.

I convert my mm measurements into cm before calculating.

[Dusky]

Yeah, but like stroke lenght, I used mm instead of inches xd

[patto]

Just wondering if anyone knows any nifty ways of measuring the cc of a pocket machined into the block?

[minimadles]

You could try filling the cut pocket with plasticine filling your burette and setting it then carefully removing the plasticine from the cut out and dropping it into the burette the difference between the readings is the displaced volume and there for the size of the pocket

[patto]

Sounds good, ill give that a go

[Cooperman]

Bring the piston to TDC and see how far down the bore the piston top is. For each 0.010" down the bore the volume is 0.80 cc. Allow 0.6 cc for ring land volume.

Then with the piston still at TDC fill the top of the piston with paraffin from a burette or a shrynge until the paraffin is exactly level with the block deck.

Subtract the bore volume above the piston plus any piston dish volume and you have the pocket volume (unless the ring gaps are so big that the paraffin drains away down the bores.

 

So, assume, as an example, that the piston top sits 0.010" down the bore and the piston dish is 6 cc and when filled there is 9.5 cc of paraffin, then the volume of the pocket is 9.5 - (0.8+6.0+0.6) = 2.4 cc

 

I hope this helps.