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Tool Talk Discussion Forum

cubic inche gage

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BUDD

08-20-2006 10:41:07




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I was told the other day that there was a tool that worked like a compression gage that would tell the cubic inches in a cylinder on a motor. Does anyone have any info on this type of tool?
BUDD




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jmixigo

08-20-2006 18:09:30




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 Re: cubic inche gage in reply to BUDD, 08-20-2006 10:41:07  
Actually it is very simple and "low tech". You have a clear glass or plastic cylender about 2 or 3 inches in diameter, marked to indicate cubic centimeters with zero near the top and a valve at the bottom (this is called a burette). Remove all of the spark plugs from the engine. Take a cylender stop (looks like a spark plug base hollowed out with a short metal rod welded into it) and place it into the engine cylender to be checked. Put a degree wheel on to the front of the crank pully or balancer and slowly turn over with a wrench till it stops, note the crank position on the degree wheel and turn in the opposite direction till it stops again. Half way between these two is top dead center. Remove the stop and turn to top dead center. Remove the valve cover from the head and disable the push rods on that cylender. The fluid used can be anything I suppose but is usually one part auto transmission fluid mixed with 10 parts alcohol. Fill the burette to zero and then add what ever the instructions say over zero to compensate for the connections. Attach a line to a fitting that screws into the spark plug hole and the other end to the valve on the burette. Open the valve on the burette to fill the combustion chamber (bump the intake valve to "burp" any air out of the chamber) and note the combustion chamber volume. Leaving the valve open on the burette rotate the crank shaft 180 degrees and note the reading, then rotate back to top dead center and verify the combustion chamber volume. Disconnect every thing with the burette valve closed. Displacement of one cylender is the fluid volume used to fill the cylender at bottom dead center less what was in the combustion chamber. Convert cc to cubic inch and multiply by number of cylenders=cubic inch of engine. Divide swept cylender volume by combustion chamber volume to get compression ratio. Unless the engine is worn slap out this is very accurate and it takes longer to tell about it than to do it.

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Bob

08-20-2006 11:56:08




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 Re: cubic inche gage in reply to BUDD, 08-20-2006 10:41:07  
Do an internet search for "P&G cubic inch measurement tool".



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J Schwiebert

08-20-2006 11:18:00




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 Re: cubic inche gage in reply to BUDD, 08-20-2006 10:41:07  
This goes back 35 years but at that time I was good friends with a guy who had a dirt track car. They had a limit on displacement and if you won they would check you to make sure you were within limits they had established for that class. It would measure the volume in one cylinder. I never saw it be he won a few times and he was checked. He always called it the pump up test.



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BUDD

08-20-2006 12:38:43




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 Re: cubic inche gage in reply to J Schwiebert, 08-20-2006 11:18:00  
Thank both of you

BUDD



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ldj

08-20-2006 13:49:31




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 Re: cubic inche gage in reply to BUDD, 08-20-2006 12:38:43  
That is interesting. A few weeks ago there was a discussion on some group that said you could use a compression gauge to check compression ratio. Well lots of folks smarter than me say both is possible but I just can't see how. I guess if a cylinder didn't have any leakage and you made just 1 revolution it may give an idea. The way I see it a small air compressor can pump 125Lb. pressure, so can a large one, it just takes longer. If the big one is in bad shape and the small on is real good it might pump it up faster than the large one and that doesn't give any indication of what CI compressor you are using. In checking car cylinder for Ci or Ratio, there to many variables, cylinder leakage, speed and how long starter turns it over to name a couple.
OH well, what do I know?
L.D.

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ebbsspeed

08-21-2006 09:10:11




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 Re: cubic inche gage in reply to ldj, 08-20-2006 13:49:31  
A compression gauge is not a valid device for checking compression ratio. Valve overlap (the time near piston TDC where both the intake and exhaust valve are open) varies greatly from one engine to another, so the amount of compression that bleeds off is different as well. A high performance engine with a high compression ratio and lots of valve overlap is likely to have less "cranking" compression pressure than a lower compression engine with little or no overlap. Plus cranking speed and temperature affect the reading on a compression gauge as well. Here's how I use a compression gauge. A compression gauge is more of a troubleshooting tool than enything.

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