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techtalk:ref:engmech02d [2018/09/05 02:25] hippysmack [With the Head Off] |
techtalk:ref:engmech02d [2024/01/14 21:02] hippysmack |
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| ====== REF: Engine Mechanicals - Sub-02D ====== | ====== REF: Engine Mechanicals - Sub-02D ====== | ||
| ====== Measuring the Volume of a Combustion Chamber ====== | ====== Measuring the Volume of a Combustion Chamber ====== | ||
| - | Article by billeuze of the XLFORUM ((http://xlforum.net/forums/showthread.php?t=1507847)) | + | Article by billeuze of the XLFORUM ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/138903-ccing-my-combustion-chambers?t=1507847)) |
| * **Tools**: | * **Tools**: | ||
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| * **Liquid for Testing**: | * **Liquid for Testing**: | ||
| * Denatured alcohol (with food coloring added for better visibility) is suggested as a fluid medium to measure with since it evaporates. \\ However, antifreeze was used in this instance. \\ Straight water is not recommended as it may help set up rust in the metal parts. \\ | * Denatured alcohol (with food coloring added for better visibility) is suggested as a fluid medium to measure with since it evaporates. \\ However, antifreeze was used in this instance. \\ Straight water is not recommended as it may help set up rust in the metal parts. \\ | ||
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| \\ | \\ | ||
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| The forgoing was done with shovelheads on and ironhead case. \\ | The forgoing was done with shovelheads on and ironhead case. \\ | ||
| The heads were pulled and the ringlands and spaces between the rings were packed with axle grease to stop any fluid getting past the rings. | The heads were pulled and the ringlands and spaces between the rings were packed with axle grease to stop any fluid getting past the rings. | ||
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| ===== With the Head On ===== | ===== With the Head On ===== | ||
| |First, find the top of bore. →|This may not be exact TDC since the piston (hovers \\ at the top a few degrees before the power stroke). →|Lock the crank to hold the piston in place. →| | |First, find the top of bore. →|This may not be exact TDC since the piston (hovers \\ at the top a few degrees before the power stroke). →|Lock the crank to hold the piston in place. →| | ||
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| |Bolt the heads on with the head gasket the same \\ type gasket your intending to run and prop up \\ the engine (head level / cylinder verticle). →|Tip it over until the front spark plug is sticking \\ straight up in the air. Brace engine, remove spark \\ plug and hang the burette over spark plug hole. →|First, fill the burette to above the mark, then bleed \\ some off the bottom till the level on top is right on the \\ "0" line. Then clamp it above the hole you want to fill. →| | |Bolt the heads on with the head gasket the same \\ type gasket your intending to run and prop up \\ the engine (head level / cylinder verticle). →|Tip it over until the front spark plug is sticking \\ straight up in the air. Brace engine, remove spark \\ plug and hang the burette over spark plug hole. →|First, fill the burette to above the mark, then bleed \\ some off the bottom till the level on top is right on the \\ "0" line. Then clamp it above the hole you want to fill. →| | ||
| |{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_4_billeuze.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_5_billeuze.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_6_billeuze.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_4_billeuze.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_5_billeuze.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_engine_ccs_with_the_head_on_by_6_billeuze.jpg?direct&300|}}| | ||
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| |Place the hose over the spark plug hole and fill the \\ chamber up the third spark plug thread. →|This chamber took a total of 87 CC. \\ It only looks higher on the photo. \\ Take the reading from the bottom of the meniscus. →|Repeat for the second cylinder. Ø| | |Place the hose over the spark plug hole and fill the \\ chamber up the third spark plug thread. →|This chamber took a total of 87 CC. \\ It only looks higher on the photo. \\ Take the reading from the bottom of the meniscus. →|Repeat for the second cylinder. Ø| | ||
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| ===== With the Head Off ===== | ===== With the Head Off ===== | ||
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| * Start with the piston in the bore (rings greased) but lowered down so the piston top is flush with the cylinder deck (if using dome piston) so you can submerge \\ the whole piston dome in measured fluid. | * Start with the piston in the bore (rings greased) but lowered down so the piston top is flush with the cylinder deck (if using dome piston) so you can submerge \\ the whole piston dome in measured fluid. | ||
| * Fasten a piece of plexiglas with a hole in one end (big enough for the burette spout) on top. \\ The hole should be at the high end of the plexiglase to allow air bubbles to escape thru the hole. \\ Tilt the cylinder on a incline. Have it so that a spirit level bubble is completely over to one edge. | * Fasten a piece of plexiglas with a hole in one end (big enough for the burette spout) on top. \\ The hole should be at the high end of the plexiglase to allow air bubbles to escape thru the hole. \\ Tilt the cylinder on a incline. Have it so that a spirit level bubble is completely over to one edge. | ||
