How to Measure Your Combustion Chamber Volume

Place the plate on the cylinder head deck surface with the hole near the edge of the combustion chamber. Later you will find that this is handy to get all the air bubbles out. Let the grease seal the plate to the head.

Normally you use a graduated burette, but we broke ours so we had to improvise.  We found a paper cup and weighed it.

Next we filled the cup with Motul ATF, weighed it and subtracted the weight of the cup to determine the weight of the fluid.

Next we used a wire as a ramp to carefully fill the combustion chamber full of ATF . Normally a burette makes this easier, but hey, the wire was not too bad and we had to improvise.  Don’t spill! If you dribble a bit don’t worry, get a razor blade and scrape the errant ATF into the hole like a line of coke!

1 comment

  1. Very creative Mike ! I borrowed a 50 ml burette from work for this, and double checked one of the 6 chambers to verify consistency. My old GT6 had flat top pistons with a variation on distance from deck height to top of pistons. To compensate for this each head chamber had different volumes, so when bolted up, the total volumes were identical.

    I also borrowed a triple-beam balance for matching piston weights. Other balancing was done by a trusted machine shop.

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