Can I get 11:1 Compression with -9cc
07-13-2009, 09:08 PM
#1
Can I get 11:1 Compression with -9cc O.K Guys I'm thinking about going N/A - Nitrous from TT Setup.
I have -9cc Diamond Pistons with 72cc MTI Heads stock Sized heads gasket
the car have 8:5 comprssion
Now I'm thinking about going PRC 215 Heads milled to 57cc with a thin gasket
to get close to 11:1 or maybe even more with big cam and 200shot.
What do you guys think and of course I will not sell the engine If this wont work then I'm keeping the TT Setup I'm mean its still fast.
Thanks in advance and waiting for the reply.
Hussam.
I have -9cc Diamond Pistons with 72cc MTI Heads stock Sized heads gasket
the car have 8:5 comprssion
Now I'm thinking about going PRC 215 Heads milled to 57cc with a thin gasket
to get close to 11:1 or maybe even more with big cam and 200shot.
What do you guys think and of course I will not sell the engine If this wont work then I'm keeping the TT Setup I'm mean its still fast.
Thanks in advance and waiting for the reply.
Hussam.
07-13-2009, 10:15 PM
#2
Here is an example figure it out;
1. Determine the displacement of your engine. Displacement formula is:
BORE X BORE X STROKE X .0031416 = DISPLACEMENT
Example: 92 x 92 x 82 x .0031416 = 2180cc
2. Determine the swept volume of one cylinder:
Example: 2180cc divided by 4 = 545cc
3. Determine the deck volume of each cylinder. The deck volume is the distance from the top center of the piston to the top of the cylinder when the piston is at top dead center. Measurement is made in thousandths.
Example: on cylinder #1 you measure and find you have .020" deck height.
BORE X BORE X DECK HEIGHT X .01996 = CC"s
Example: 92 x 92 x .020" x .01996 = 3.378cc's
Measure each cylinder.
4. Measure the volume in each cylinder head. To do this, use a piece of plexiglass cut to fit in the cylinder head to cylinder mating area. Drill a 1/4" hole in the center of the plexiglass. Lightly grease the edge of the plexiglass and install in the head. (Spark plug and valves have to be installed) with a syringe graduated in cc's fill the cylinder head chamber up with a light weight oil. Record the measurements. Repeat for other three chambers. Average cc volume of a new head chamber is between 47 and 51 cc's.
5. You now have all the measurements to determine your compression ratio.
one cylinder swept volume + deck cc + head cc
deck cc + head cc
Example: 545 + 3.378 + 48 = 596.378
3.378 + 48 = 51.378 = 11.6:1
1. Determine the displacement of your engine. Displacement formula is:
BORE X BORE X STROKE X .0031416 = DISPLACEMENT
Example: 92 x 92 x 82 x .0031416 = 2180cc
2. Determine the swept volume of one cylinder:
Example: 2180cc divided by 4 = 545cc
3. Determine the deck volume of each cylinder. The deck volume is the distance from the top center of the piston to the top of the cylinder when the piston is at top dead center. Measurement is made in thousandths.
Example: on cylinder #1 you measure and find you have .020" deck height.
BORE X BORE X DECK HEIGHT X .01996 = CC"s
Example: 92 x 92 x .020" x .01996 = 3.378cc's
Measure each cylinder.
4. Measure the volume in each cylinder head. To do this, use a piece of plexiglass cut to fit in the cylinder head to cylinder mating area. Drill a 1/4" hole in the center of the plexiglass. Lightly grease the edge of the plexiglass and install in the head. (Spark plug and valves have to be installed) with a syringe graduated in cc's fill the cylinder head chamber up with a light weight oil. Record the measurements. Repeat for other three chambers. Average cc volume of a new head chamber is between 47 and 51 cc's.
5. You now have all the measurements to determine your compression ratio.
one cylinder swept volume + deck cc + head cc
deck cc + head cc
Example: 545 + 3.378 + 48 = 596.378
3.378 + 48 = 51.378 = 11.6:1
Last edited by 02*C5; 07-13-2009 at 10:22 PM.
07-14-2009, 01:40 AM
#3
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mad props Here is an example figure it out;
1. Determine the displacement of your engine. Displacement formula is:
BORE X BORE X STROKE X .0031416 = DISPLACEMENT
Example: 92 x 92 x 82 x .0031416 = 2180cc
2. Determine the swept volume of one cylinder:
Example: 2180cc divided by 4 = 545cc
3. Determine the deck volume of each cylinder. The deck volume is the distance from the top center of the piston to the top of the cylinder when the piston is at top dead center. Measurement is made in thousandths.
Example: on cylinder #1 you measure and find you have .020" deck height.
BORE X BORE X DECK HEIGHT X .01996 = CC"s
Example: 92 x 92 x .020" x .01996 = 3.378cc's
Measure each cylinder.
4. Measure the volume in each cylinder head. To do this, use a piece of plexiglass cut to fit in the cylinder head to cylinder mating area. Drill a 1/4" hole in the center of the plexiglass. Lightly grease the edge of the plexiglass and install in the head. (Spark plug and valves have to be installed) with a syringe graduated in cc's fill the cylinder head chamber up with a light weight oil. Record the measurements. Repeat for other three chambers. Average cc volume of a new head chamber is between 47 and 51 cc's.
5. You now have all the measurements to determine your compression ratio.
one cylinder swept volume + deck cc + head cc
deck cc + head cc
Example: 545 + 3.378 + 48 = 596.378
3.378 + 48 = 51.378 = 11.6:1
1. Determine the displacement of your engine. Displacement formula is:
BORE X BORE X STROKE X .0031416 = DISPLACEMENT
Example: 92 x 92 x 82 x .0031416 = 2180cc
2. Determine the swept volume of one cylinder:
Example: 2180cc divided by 4 = 545cc
3. Determine the deck volume of each cylinder. The deck volume is the distance from the top center of the piston to the top of the cylinder when the piston is at top dead center. Measurement is made in thousandths.
Example: on cylinder #1 you measure and find you have .020" deck height.
BORE X BORE X DECK HEIGHT X .01996 = CC"s
Example: 92 x 92 x .020" x .01996 = 3.378cc's
Measure each cylinder.
4. Measure the volume in each cylinder head. To do this, use a piece of plexiglass cut to fit in the cylinder head to cylinder mating area. Drill a 1/4" hole in the center of the plexiglass. Lightly grease the edge of the plexiglass and install in the head. (Spark plug and valves have to be installed) with a syringe graduated in cc's fill the cylinder head chamber up with a light weight oil. Record the measurements. Repeat for other three chambers. Average cc volume of a new head chamber is between 47 and 51 cc's.
5. You now have all the measurements to determine your compression ratio.
one cylinder swept volume + deck cc + head cc
deck cc + head cc
Example: 545 + 3.378 + 48 = 596.378
3.378 + 48 = 51.378 = 11.6:1
Jeez, mad props on all the work done in this post. Good stuff man.
07-14-2009, 01:58 AM
#5
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I think PRC can finish the chamber withb any cc volume from 64-57 or somewhere in that range. So if you ordered the PRCs with 57CC chambers and then milled you could easily get 11.1:1 or 11.5:1 compression.
Whats wrong with your current turbo setup? Want the instant torque of nitrous? Or just wanna try the other style of making big power out?
Whats wrong with your current turbo setup? Want the instant torque of nitrous? Or just wanna try the other style of making big power out?
