I needed to cc a pair of heads and thought I'd take some pics along the way in case some one had need of it.
The supplies I used were a jar of Vaseline, bottle of alcohol, a large syringe, a piece of clear plastic (a CD case would work)
Using the Vaseline, seal around the valves and a bead around the chamber.
Place the clear plastic panel over the chamber with a small hole near the top edge. Push down on the plastic to squeee the vaseline into an air tight seal. Begin introducing the alcohol through the hole in the plastic, keeping track of how much is used.
When the alcohol fills the chamber to the hole with no air add up the CC's used in the syringe. That is the volume of your chamber.
Intake and exhaust runners can be measured the same way. I use alcohol because water always leaves little bubbles that throw the volume off. There are several compression ratio calculators on the net. You will need your chamber volume, head gasket thickness and bore diameter, as well as the bore and stroke of your engine, deck to piston distance and any dish, dome, or valve reliefs.
My chambers measured 61.5 cc's and with my head gasket and pistons calculates to 9.6 to 1
This is an important thing to do when doing head work to make sure the chambers are consistent from cylinder to cylinder as well as knowing what fuel you need to be using for best performance.
I hope you get some use from this, even if it's a better understanding of what you pay for when you have head work done.
Jim
_________1966 Avanti II RQA 0088______________________1963 Avanti R2 63R3152_______________Rabid Snail Racing
The supplies I used were a jar of Vaseline, bottle of alcohol, a large syringe, a piece of clear plastic (a CD case would work)
Using the Vaseline, seal around the valves and a bead around the chamber.
Place the clear plastic panel over the chamber with a small hole near the top edge. Push down on the plastic to squeee the vaseline into an air tight seal. Begin introducing the alcohol through the hole in the plastic, keeping track of how much is used.
When the alcohol fills the chamber to the hole with no air add up the CC's used in the syringe. That is the volume of your chamber.
Intake and exhaust runners can be measured the same way. I use alcohol because water always leaves little bubbles that throw the volume off. There are several compression ratio calculators on the net. You will need your chamber volume, head gasket thickness and bore diameter, as well as the bore and stroke of your engine, deck to piston distance and any dish, dome, or valve reliefs.
My chambers measured 61.5 cc's and with my head gasket and pistons calculates to 9.6 to 1
This is an important thing to do when doing head work to make sure the chambers are consistent from cylinder to cylinder as well as knowing what fuel you need to be using for best performance.
I hope you get some use from this, even if it's a better understanding of what you pay for when you have head work done.
Jim
_________1966 Avanti II RQA 0088______________________1963 Avanti R2 63R3152_______________Rabid Snail Racing
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