how do ya measure comp ratio on a car with the head off
15-06-2005, 07:58 PM
#1
just finding my feet
Thread Starter
how do ya measure comp ratio on a car with the head off
i cant rememeber, i know theres parafin involved but then i got lost 
lets make this a top post and add to the techy archives
or atleast help me out
i got a block and a head seperate and i can measure itwith plastic rulers and bits of string and luck but whats the way ya do it with fluid
theres been a post about it before but not added to the tech archives section ( shame on you )
so come on guys lets get all techy
lets make this a top post and add to the techy archives
or atleast help me out
i got a block and a head seperate and i can measure itwith plastic rulers and bits of string and luck but whats the way ya do it with fluid
theres been a post about it before but not added to the tech archives section ( shame on you
)so come on guys lets get all techy
15-06-2005, 08:22 PM
#4
just finding my feet
Thread Starter
ya wanna know too
damo im catching up with ya now ( ok i took the head off )
engine out the weekend
and the missus said no to my rebuild in the babys room and her room ( kitchen) and so shes told me as she wants a ceramic tiles in the front roomand no carpet do it in there and if i get a drop of oil on the floor im getting tiles
shes a star aint she
damo im catching up with ya now ( ok i took the head off
)engine out the weekend
and the missus said no to my rebuild in the babys room and her room ( kitchen) and so shes told me as she wants a ceramic tiles in the front roomand no carpet do it in there and if i get a drop of oil on the floor im getting tiles
shes a star aint she
15-06-2005, 08:27 PM
#6
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https://passionford.com/forum/viewtopic.php?p=1716072
Second time I've answered you, now read the links
Second time I've answered you, now read the links
15-06-2005, 08:34 PM
#7
Wahay!! I've lost my Virginity!!
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You need a dropping pipette that will hold around 50cc and some fluid like parrafin.
1. Fit head with all valves and spark plugs, place upside down (chambers up) and with the pipette fill the chamber till the fluid is level with the surface. Measure how much you used, should be easy as the pipette should have calibration marks on it.
2. Next the piston, put a very small amount of oil around the bore (just enough to wet it) this will seal the rings enough to hold the fluid. Get piston at TDC and fill the remaining space with your fluid and measure amount used again.
3. calculate swept volume of cylinder (area of bore x the stroke)
4. calculate area of compressed head gasket (area of bore x thickness)
5. add all these together to give your total cylinder volume, then add 1.2. and 4. to give your combustion chamber volume. Then divide the combustion chamber volume into your total cylinder volume to give you your compression ratio.
Repeat for all cylinders.
Thats how ive done it
1. Fit head with all valves and spark plugs, place upside down (chambers up) and with the pipette fill the chamber till the fluid is level with the surface. Measure how much you used, should be easy as the pipette should have calibration marks on it.
2. Next the piston, put a very small amount of oil around the bore (just enough to wet it) this will seal the rings enough to hold the fluid. Get piston at TDC and fill the remaining space with your fluid and measure amount used again.
3. calculate swept volume of cylinder (area of bore x the stroke)
4. calculate area of compressed head gasket (area of bore x thickness)
5. add all these together to give your total cylinder volume, then add 1.2. and 4. to give your combustion chamber volume. Then divide the combustion chamber volume into your total cylinder volume to give you your compression ratio.
Repeat for all cylinders.
Thats how ive done it
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15-06-2005, 08:45 PM
#9
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Originally Posted by b19bal
billy wanna know whats worse, i fooking saved the link on me favorite sites too
i totally forgot
i totally forgot
on the thread in the TECHNICAL ESSAYS ARCHIVE that I bttt'd for you 
....and stop calling me Billy
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